{ "name": "US Aurora Season Climatology", "version": "2026-09-07", "date_modified": "2026-09-07", "description": "Month-by-month aurora opportunity for 373 US cities and 49 states: hours of astronomical darkness, nights on which planetary Kp reached the location threshold inside that darkness, the local cloud normal, and the two combined. A typical year reconstructed from a closed record, not a forecast.", "methodology": { "metric": "clear opportunity nights = nights on which at least one 3-hour Kp interval falls inside local astronomical darkness and reaches the location’s horizon threshold, scaled by (1 - monthly mean cloud amount)", "kp": { "source": "GFZ Potsdam planetary Kp index, 3-hourly, 1996-01-01 to 2026-09-07", "url": "https://kp.gfz.de/app/json/", "license": "CC BY 4.0", "read_via": "gfz", "intervals_used": 89661, "cadence_hours": 3, "scale": "0-9" }, "cloud": { "source": "NASA POWER SYN1DEG 20-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2020)", "url": "https://power.larc.nasa.gov/api/temporal/climatology/point", "parameter": "CLOUD_AMT", "fill_value": -999, "cities_with_data": 373 }, "darkness": { "definition": "sun geometric altitude at or below -18 degrees (astronomical twilight)", "dark_hours": "mean hours of darkness on the nights of the month that have any; `dark_nights_share` says how many of the month’s nights those are, and is 1 wherever darkness is nightly", "integration": "10-minute samples across every year of the Kp record (1996-2026), averaged per night of each month rather than sampled on one representative day", "night_bucketing": "solar time (longitude / 15), solar noon to solar noon, so daylight saving never enters" }, "moon": { "illumination_cutoff": 0.35, "source": "StatusThresholds.moon.crescent = 35 in aurora-forecast-usa src/data/status-thresholds.ts", "altitude": "topocentric, 6371 km Earth radius" }, "oval": { "model": "NOAA auroral oval: equatorward boundary near magnetic latitude 67 - 2 x Kp, elevation from a 110 km emission height and a 6371 km Earth radius", "note": "model estimate, reported separately; it never overrules the measured record in `verdict`" }, "verdict_bands": { "unit": "clear opportunity nights per year", "regular": ">= 24", "occasional": ">= 6", "few_nights": ">= 1", "storm_only": "> 0, or any recorded threshold crossing", "no_recorded_opportunity": "no clear nights and no recorded crossing" }, "ephemeris": "astronomy-engine 2.1.19", "interpretation": "Every figure describes a typical year assembled from a closed 1996-2026 Kp record and a 2001-2020 cloud normal. It is not a forecast, a probability for any dated night, or a record of aurora sightings. Oval position is a separate model estimate and never overrules the measured Kp record.", "sources": [ "https://kp.gfz.de/app/json/", "https://power.larc.nasa.gov/api/temporal/climatology/point", "https://aurora-forecast-usa.com/methodology" ] }, "columns": [ "city", "state", "month", "dark_hours", "opportunity_nights", "cloud_amount_pct", "clear_opportunity_nights", "moon_free_share" ], "rows": [ { "city": "Aberdeen", "state": "South Dakota", "month": "jan", "dark_hours": 11.31, "opportunity_nights": 0.16, "cloud_amount_pct": 63.9, "clear_opportunity_nights": 0.06, "moon_free_share": 0.55 }, { "city": "Aberdeen", "state": "South Dakota", "month": "feb", "dark_hours": 10.24, "opportunity_nights": 0, "cloud_amount_pct": 62.3, "clear_opportunity_nights": 0, "moon_free_share": 0.538 }, { "city": "Aberdeen", "state": "South Dakota", "month": "mar", "dark_hours": 8.69, "opportunity_nights": 0.1, "cloud_amount_pct": 65.5, "clear_opportunity_nights": 0.03, "moon_free_share": 0.541 }, { "city": "Aberdeen", "state": "South Dakota", "month": "apr", "dark_hours": 6.75, "opportunity_nights": 0.13, "cloud_amount_pct": 61.2, "clear_opportunity_nights": 0.05, "moon_free_share": 0.546 }, { "city": "Aberdeen", "state": "South Dakota", "month": "may", "dark_hours": 4.62, "opportunity_nights": 0.2, "cloud_amount_pct": 60.5, "clear_opportunity_nights": 0.08, "moon_free_share": 0.55 }, { "city": "Aberdeen", "state": "South Dakota", "month": "jun", "dark_hours": 3.18, "opportunity_nights": 0.03, "cloud_amount_pct": 53.9, "clear_opportunity_nights": 0.01, "moon_free_share": 0.53 }, { "city": "Aberdeen", "state": "South Dakota", "month": "jul", "dark_hours": 4.04, "opportunity_nights": 0.07, "cloud_amount_pct": 45, "clear_opportunity_nights": 0.04, "moon_free_share": 0.557 }, { "city": "Aberdeen", "state": "South Dakota", "month": "aug", "dark_hours": 6.12, "opportunity_nights": 0.16, "cloud_amount_pct": 46, "clear_opportunity_nights": 0.09, "moon_free_share": 0.546 }, { "city": "Aberdeen", "state": "South Dakota", "month": "sep", "dark_hours": 8.13, "opportunity_nights": 0.23, "cloud_amount_pct": 48.6, "clear_opportunity_nights": 0.12, "moon_free_share": 0.563 }, { "city": "Aberdeen", "state": "South Dakota", "month": "oct", "dark_hours": 9.81, "opportunity_nights": 0.42, "cloud_amount_pct": 57.9, "clear_opportunity_nights": 0.18, "moon_free_share": 0.562 }, { "city": "Aberdeen", "state": "South Dakota", "month": "nov", "dark_hours": 11.07, "opportunity_nights": 0.36, "cloud_amount_pct": 61.2, "clear_opportunity_nights": 0.14, "moon_free_share": 0.555 }, { "city": "Aberdeen", "state": "South Dakota", "month": "dec", "dark_hours": 11.67, "opportunity_nights": 0.03, "cloud_amount_pct": 66.6, "clear_opportunity_nights": 0.01, "moon_free_share": 0.549 }, { "city": "Adak", "state": "Alaska", "month": "jan", "dark_hours": 11.54, "opportunity_nights": 0, "cloud_amount_pct": 85.8, "clear_opportunity_nights": 0, "moon_free_share": 0.538 }, { "city": "Adak", "state": "Alaska", "month": "feb", "dark_hours": 10.19, "opportunity_nights": 0, "cloud_amount_pct": 87.5, "clear_opportunity_nights": 0, "moon_free_share": 0.552 }, { "city": "Adak", "state": "Alaska", "month": "mar", "dark_hours": 8.21, "opportunity_nights": 0, "cloud_amount_pct": 87.6, "clear_opportunity_nights": 0, "moon_free_share": 0.535 }, { "city": "Adak", "state": "Alaska", "month": "apr", "dark_hours": 5.55, "opportunity_nights": 0, "cloud_amount_pct": 88.2, "clear_opportunity_nights": 0, "moon_free_share": 0.542 }, { "city": "Adak", "state": "Alaska", "month": "may", "dark_hours": 2.55, "opportunity_nights": 0.03, "cloud_amount_pct": 92, "clear_opportunity_nights": 0, "moon_free_share": 0.57 }, { "city": "Adak", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 95.2, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Adak", "state": "Alaska", "month": "jul", "dark_hours": 1.79, "opportunity_nights": 0, "cloud_amount_pct": 94.6, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Adak", "state": "Alaska", "month": "aug", "dark_hours": 4.63, "opportunity_nights": 0.07, "cloud_amount_pct": 92.2, "clear_opportunity_nights": 0.01, "moon_free_share": 0.563 }, { "city": "Adak", "state": "Alaska", "month": "sep", "dark_hours": 7.5, "opportunity_nights": 0.03, "cloud_amount_pct": 83.7, "clear_opportunity_nights": 0, "moon_free_share": 0.548 }, { "city": "Adak", "state": "Alaska", "month": "oct", "dark_hours": 9.67, "opportunity_nights": 0.07, "cloud_amount_pct": 79.4, "clear_opportunity_nights": 0.01, "moon_free_share": 0.543 }, { "city": "Adak", "state": "Alaska", "month": "nov", "dark_hours": 11.26, "opportunity_nights": 0.13, "cloud_amount_pct": 82, "clear_opportunity_nights": 0.02, "moon_free_share": 0.552 }, { "city": "Adak", "state": "Alaska", "month": "dec", "dark_hours": 11.94, "opportunity_nights": 0.03, "cloud_amount_pct": 83, "clear_opportunity_nights": 0.01, "moon_free_share": 0.543 }, { "city": "Akhiok", "state": "Alaska", "month": "jan", "dark_hours": 11.76, "opportunity_nights": 0.78, "cloud_amount_pct": 87.4, "clear_opportunity_nights": 0.1, "moon_free_share": 0.532 }, { "city": "Akhiok", "state": "Alaska", "month": "feb", "dark_hours": 10.11, "opportunity_nights": 0.85, "cloud_amount_pct": 87.9, "clear_opportunity_nights": 0.1, "moon_free_share": 0.529 }, { "city": "Akhiok", "state": "Alaska", "month": "mar", "dark_hours": 7.66, "opportunity_nights": 1.5, "cloud_amount_pct": 84, "clear_opportunity_nights": 0.24, "moon_free_share": 0.543 }, { "city": "Akhiok", "state": "Alaska", "month": "apr", "dark_hours": 3.97, "opportunity_nights": 0.62, "cloud_amount_pct": 86.4, "clear_opportunity_nights": 0.08, "moon_free_share": 0.553 }, { "city": "Akhiok", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 85, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akhiok", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 85.1, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akhiok", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 83.3, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akhiok", "state": "Alaska", "month": "aug", "dark_hours": 3.32, "opportunity_nights": 0.39, "cloud_amount_pct": 80.4, "clear_opportunity_nights": 0.08, "moon_free_share": 0.585 }, { "city": "Akhiok", "state": "Alaska", "month": "sep", "dark_hours": 6.74, "opportunity_nights": 1.66, "cloud_amount_pct": 77.8, "clear_opportunity_nights": 0.37, "moon_free_share": 0.559 }, { "city": "Akhiok", "state": "Alaska", "month": "oct", "dark_hours": 9.47, "opportunity_nights": 1.66, "cloud_amount_pct": 79.9, "clear_opportunity_nights": 0.33, "moon_free_share": 0.551 }, { "city": "Akhiok", "state": "Alaska", "month": "nov", "dark_hours": 11.41, "opportunity_nights": 2.02, "cloud_amount_pct": 82.6, "clear_opportunity_nights": 0.35, "moon_free_share": 0.539 }, { "city": "Akhiok", "state": "Alaska", "month": "dec", "dark_hours": 12.26, "opportunity_nights": 0.85, "cloud_amount_pct": 87.2, "clear_opportunity_nights": 0.11, "moon_free_share": 0.539 }, { "city": "Akiachak", "state": "Alaska", "month": "jan", "dark_hours": 11.95, "opportunity_nights": 1.01, "cloud_amount_pct": 59.5, "clear_opportunity_nights": 0.41, "moon_free_share": 0.528 }, { "city": "Akiachak", "state": "Alaska", "month": "feb", "dark_hours": 10.01, "opportunity_nights": 0.85, "cloud_amount_pct": 68.3, "clear_opportunity_nights": 0.27, "moon_free_share": 0.536 }, { "city": "Akiachak", "state": "Alaska", "month": "mar", "dark_hours": 7.04, "opportunity_nights": 1.24, "cloud_amount_pct": 59.1, "clear_opportunity_nights": 0.51, "moon_free_share": 0.551 }, { "city": "Akiachak", "state": "Alaska", "month": "apr", "dark_hours": 3.32, "opportunity_nights": 0.39, "cloud_amount_pct": 71.6, "clear_opportunity_nights": 0.11, "moon_free_share": 0.58 }, { "city": "Akiachak", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 78.3, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akiachak", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 79.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akiachak", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 83.4, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akiachak", "state": "Alaska", "month": "aug", "dark_hours": 2.34, "opportunity_nights": 0.2, "cloud_amount_pct": 81.5, "clear_opportunity_nights": 0.04, "moon_free_share": 0.579 }, { "city": "Akiachak", "state": "Alaska", "month": "sep", "dark_hours": 5.87, "opportunity_nights": 1.56, "cloud_amount_pct": 77.2, "clear_opportunity_nights": 0.36, "moon_free_share": 0.568 }, { "city": "Akiachak", "state": "Alaska", "month": "oct", "dark_hours": 9.24, "opportunity_nights": 1.66, "cloud_amount_pct": 76.8, "clear_opportunity_nights": 0.39, "moon_free_share": 0.547 }, { "city": "Akiachak", "state": "Alaska", "month": "nov", "dark_hours": 11.53, "opportunity_nights": 1.82, "cloud_amount_pct": 72.8, "clear_opportunity_nights": 0.5, "moon_free_share": 0.536 }, { "city": "Akiachak", "state": "Alaska", "month": "dec", "dark_hours": 12.55, "opportunity_nights": 0.98, "cloud_amount_pct": 67, "clear_opportunity_nights": 0.32, "moon_free_share": 0.547 }, { "city": "Akiak", "state": "Alaska", "month": "jan", "dark_hours": 11.95, "opportunity_nights": 1.01, "cloud_amount_pct": 59.5, "clear_opportunity_nights": 0.41, "moon_free_share": 0.528 }, { "city": "Akiak", "state": "Alaska", "month": "feb", "dark_hours": 10.01, "opportunity_nights": 0.85, "cloud_amount_pct": 68.3, "clear_opportunity_nights": 0.27, "moon_free_share": 0.536 }, { "city": "Akiak", "state": "Alaska", "month": "mar", "dark_hours": 7.04, "opportunity_nights": 1.27, "cloud_amount_pct": 59.1, "clear_opportunity_nights": 0.52, "moon_free_share": 0.55 }, { "city": "Akiak", "state": "Alaska", "month": "apr", "dark_hours": 3.32, "opportunity_nights": 0.39, "cloud_amount_pct": 71.6, "clear_opportunity_nights": 0.11, "moon_free_share": 0.58 }, { "city": "Akiak", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 78.3, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akiak", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 79.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akiak", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 83.4, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akiak", "state": "Alaska", "month": "aug", "dark_hours": 2.34, "opportunity_nights": 0.23, "cloud_amount_pct": 81.5, "clear_opportunity_nights": 0.04, "moon_free_share": 0.578 }, { "city": "Akiak", "state": "Alaska", "month": "sep", "dark_hours": 5.87, "opportunity_nights": 1.56, "cloud_amount_pct": 77.2, "clear_opportunity_nights": 0.36, "moon_free_share": 0.568 }, { "city": "Akiak", "state": "Alaska", "month": "oct", "dark_hours": 9.24, "opportunity_nights": 1.66, "cloud_amount_pct": 76.8, "clear_opportunity_nights": 0.39, "moon_free_share": 0.546 }, { "city": "Akiak", "state": "Alaska", "month": "nov", "dark_hours": 11.53, "opportunity_nights": 1.86, "cloud_amount_pct": 72.8, "clear_opportunity_nights": 0.51, "moon_free_share": 0.536 }, { "city": "Akiak", "state": "Alaska", "month": "dec", "dark_hours": 12.55, "opportunity_nights": 0.98, "cloud_amount_pct": 67, "clear_opportunity_nights": 0.32, "moon_free_share": 0.547 }, { "city": "Akutan", "state": "Alaska", "month": "jan", "dark_hours": 11.63, "opportunity_nights": 0.13, "cloud_amount_pct": 90.2, "clear_opportunity_nights": 0.01, "moon_free_share": 0.536 }, { "city": "Akutan", "state": "Alaska", "month": "feb", "dark_hours": 10.17, "opportunity_nights": 0, "cloud_amount_pct": 90.6, "clear_opportunity_nights": 0, "moon_free_share": 0.538 }, { "city": "Akutan", "state": "Alaska", "month": "mar", "dark_hours": 7.99, "opportunity_nights": 0.13, "cloud_amount_pct": 88.1, "clear_opportunity_nights": 0.02, "moon_free_share": 0.551 }, { "city": "Akutan", "state": "Alaska", "month": "apr", "dark_hours": 4.96, "opportunity_nights": 0.16, "cloud_amount_pct": 92.7, "clear_opportunity_nights": 0.01, "moon_free_share": 0.545 }, { "city": "Akutan", "state": "Alaska", "month": "may", "dark_hours": 1.94, "opportunity_nights": 0, "cloud_amount_pct": 91.4, "clear_opportunity_nights": 0, "moon_free_share": 0.57 }, { "city": "Akutan", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 92.1, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akutan", "state": "Alaska", "month": "jul", "dark_hours": 0.23, "opportunity_nights": 0, "cloud_amount_pct": 92.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Akutan", "state": "Alaska", "month": "aug", "dark_hours": 3.75, "opportunity_nights": 0.1, "cloud_amount_pct": 90.6, "clear_opportunity_nights": 0.01, "moon_free_share": 0.56 }, { "city": "Akutan", "state": "Alaska", "month": "sep", "dark_hours": 7.2, "opportunity_nights": 0.16, "cloud_amount_pct": 89.2, "clear_opportunity_nights": 0.02, "moon_free_share": 0.56 }, { "city": "Akutan", "state": "Alaska", "month": "oct", "dark_hours": 9.59, "opportunity_nights": 0.2, "cloud_amount_pct": 87.6, "clear_opportunity_nights": 0.02, "moon_free_share": 0.536 }, { "city": "Akutan", "state": "Alaska", "month": "nov", "dark_hours": 11.33, "opportunity_nights": 0.33, "cloud_amount_pct": 89.8, "clear_opportunity_nights": 0.03, "moon_free_share": 0.543 }, { "city": "Akutan", "state": "Alaska", "month": "dec", "dark_hours": 12.09, "opportunity_nights": 0.03, "cloud_amount_pct": 89.8, "clear_opportunity_nights": 0, "moon_free_share": 0.545 }, { "city": "Alakanuk", "state": "Alaska", "month": "jan", "dark_hours": 12.04, "opportunity_nights": 3.62, "cloud_amount_pct": 67.1, "clear_opportunity_nights": 1.19, "moon_free_share": 0.527 }, { "city": "Alakanuk", "state": "Alaska", "month": "feb", "dark_hours": 9.94, "opportunity_nights": 3.49, "cloud_amount_pct": 70, "clear_opportunity_nights": 1.05, "moon_free_share": 0.54 }, { "city": "Alakanuk", "state": "Alaska", "month": "mar", "dark_hours": 6.68, "opportunity_nights": 3.29, "cloud_amount_pct": 64.3, "clear_opportunity_nights": 1.17, "moon_free_share": 0.55 }, { "city": "Alakanuk", "state": "Alaska", "month": "apr", "dark_hours": 2.89, "opportunity_nights": 0.78, "cloud_amount_pct": 74.7, "clear_opportunity_nights": 0.2, "moon_free_share": 0.586 }, { "city": "Alakanuk", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 78.1, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Alakanuk", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 77.7, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Alakanuk", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 85.2, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Alakanuk", "state": "Alaska", "month": "aug", "dark_hours": 1.55, "opportunity_nights": 0.2, "cloud_amount_pct": 80.7, "clear_opportunity_nights": 0.04, "moon_free_share": 0.549 }, { "city": "Alakanuk", "state": "Alaska", "month": "sep", "dark_hours": 5.31, "opportunity_nights": 3.62, "cloud_amount_pct": 81.9, "clear_opportunity_nights": 0.66, "moon_free_share": 0.573 }, { "city": "Alakanuk", "state": "Alaska", "month": "oct", "dark_hours": 9.11, "opportunity_nights": 4.76, "cloud_amount_pct": 83.6, "clear_opportunity_nights": 0.78, "moon_free_share": 0.543 }, { "city": "Alakanuk", "state": "Alaska", "month": "nov", "dark_hours": 11.58, "opportunity_nights": 4.24, "cloud_amount_pct": 81.6, "clear_opportunity_nights": 0.78, "moon_free_share": 0.541 }, { "city": "Alakanuk", "state": "Alaska", "month": "dec", "dark_hours": 12.69, "opportunity_nights": 3.29, "cloud_amount_pct": 73.7, "clear_opportunity_nights": 0.87, "moon_free_share": 0.534 }, { "city": "Alatna", "state": "Alaska", "month": "jan", "dark_hours": 12.26, "opportunity_nights": 27.47, "cloud_amount_pct": 49, "clear_opportunity_nights": 14.01, "moon_free_share": 0.532 }, { "city": "Alatna", "state": "Alaska", "month": "feb", "dark_hours": 9.73, "opportunity_nights": 24.31, "cloud_amount_pct": 57.3, "clear_opportunity_nights": 10.38, "moon_free_share": 0.535 }, { "city": "Alatna", "state": "Alaska", "month": "mar", "dark_hours": 5.55, "opportunity_nights": 25.03, "cloud_amount_pct": 44.7, "clear_opportunity_nights": 13.84, "moon_free_share": 0.56 }, { "city": "Alatna", "state": "Alaska", "month": "apr", "dark_hours": 1.15, "opportunity_nights": 0.98, "cloud_amount_pct": 51.9, "clear_opportunity_nights": 0.47, "moon_free_share": 0.545 }, { "city": "Alatna", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 63.4, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Alatna", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 66.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Alatna", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 73.1, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Alatna", "state": "Alaska", "month": "aug", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 71.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Alatna", "state": "Alaska", "month": "sep", "dark_hours": 4.43, 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"Wisconsin", "month": "mar", "dark_hours": 8.61, "opportunity_nights": 0.39, "cloud_amount_pct": 65.4, "clear_opportunity_nights": 0.13, "moon_free_share": 0.533 }, { "city": "Bayfield", "state": "Wisconsin", "month": "apr", "dark_hours": 6.55, "opportunity_nights": 0.46, "cloud_amount_pct": 68.2, "clear_opportunity_nights": 0.15, "moon_free_share": 0.539 }, { "city": "Bayfield", "state": "Wisconsin", "month": "may", "dark_hours": 4.22, "opportunity_nights": 0.72, "cloud_amount_pct": 70.3, "clear_opportunity_nights": 0.21, "moon_free_share": 0.549 }, { "city": "Bayfield", "state": "Wisconsin", "month": "jun", "dark_hours": 2.51, "opportunity_nights": 0.03, "cloud_amount_pct": 66.6, "clear_opportunity_nights": 0.01, "moon_free_share": 0.545 }, { "city": "Bayfield", "state": "Wisconsin", "month": "jul", "dark_hours": 3.54, "opportunity_nights": 0.26, "cloud_amount_pct": 57.9, "clear_opportunity_nights": 0.11, "moon_free_share": 0.571 }, { "city": "Bayfield", "state": "Wisconsin", 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"moon_free_share": 0.528 }, { "city": "Bellingham", "state": "Washington", "month": "may", "dark_hours": 3.46, "opportunity_nights": 0.49, "cloud_amount_pct": 67.3, "clear_opportunity_nights": 0.16, "moon_free_share": 0.557 }, { "city": "Bellingham", "state": "Washington", "month": "jun", "dark_hours": 1.01, "opportunity_nights": 0.07, "cloud_amount_pct": 64.3, "clear_opportunity_nights": 0.02, "moon_free_share": 0.522 }, { "city": "Bellingham", "state": "Washington", "month": "jul", "dark_hours": 2.53, "opportunity_nights": 0.16, "cloud_amount_pct": 43.9, "clear_opportunity_nights": 0.09, "moon_free_share": 0.519 }, { "city": "Bellingham", "state": "Washington", "month": "aug", "dark_hours": 5.47, "opportunity_nights": 0.29, "cloud_amount_pct": 46.1, "clear_opportunity_nights": 0.16, "moon_free_share": 0.576 }, { "city": "Bellingham", "state": "Washington", "month": "sep", "dark_hours": 7.83, "opportunity_nights": 0.72, "cloud_amount_pct": 54, "clear_opportunity_nights": 0.33, "moon_free_share": 0.556 }, { "city": "Bellingham", "state": "Washington", "month": "oct", "dark_hours": 9.74, "opportunity_nights": 0.81, "cloud_amount_pct": 69.8, "clear_opportunity_nights": 0.24, "moon_free_share": 0.535 }, { "city": "Bellingham", "state": "Washington", "month": "nov", "dark_hours": 11.16, "opportunity_nights": 0.95, "cloud_amount_pct": 79.2, "clear_opportunity_nights": 0.2, "moon_free_share": 0.547 }, { "city": "Bellingham", "state": "Washington", "month": "dec", "dark_hours": 11.84, "opportunity_nights": 0.16, "cloud_amount_pct": 83.2, "clear_opportunity_nights": 0.03, "moon_free_share": 0.55 }, { "city": "Bemidji", "state": "Minnesota", "month": "jan", "dark_hours": 11.39, "opportunity_nights": 0.39, "cloud_amount_pct": 63.7, "clear_opportunity_nights": 0.14, "moon_free_share": 0.546 }, { "city": "Bemidji", "state": "Minnesota", "month": "feb", "dark_hours": 10.23, "opportunity_nights": 0.26, "cloud_amount_pct": 60.3, "clear_opportunity_nights": 0.1, "moon_free_share": 0.548 }, { "city": "Bemidji", "state": "Minnesota", "month": "mar", "dark_hours": 8.57, "opportunity_nights": 0.42, "cloud_amount_pct": 63.1, "clear_opportunity_nights": 0.15, "moon_free_share": 0.539 }, { "city": "Bemidji", "state": "Minnesota", "month": "apr", "dark_hours": 6.44, "opportunity_nights": 0.46, "cloud_amount_pct": 63.7, "clear_opportunity_nights": 0.17, "moon_free_share": 0.543 }, { "city": "Bemidji", "state": "Minnesota", "month": "may", "dark_hours": 3.99, "opportunity_nights": 0.68, "cloud_amount_pct": 63.1, "clear_opportunity_nights": 0.25, "moon_free_share": 0.548 }, { "city": "Bemidji", "state": "Minnesota", "month": "jun", "dark_hours": 2.07, "opportunity_nights": 0.07, "cloud_amount_pct": 60.8, "clear_opportunity_nights": 0.03, "moon_free_share": 0.517 }, { "city": "Bemidji", "state": "Minnesota", "month": "jul", "dark_hours": 3.25, "opportunity_nights": 0.2, "cloud_amount_pct": 49.9, "clear_opportunity_nights": 0.1, "moon_free_share": 0.575 }, { "city": "Bemidji", "state": "Minnesota", "month": "aug", "dark_hours": 5.74, "opportunity_nights": 0.42, "cloud_amount_pct": 50.4, "clear_opportunity_nights": 0.21, "moon_free_share": 0.554 }, { "city": "Bemidji", "state": "Minnesota", "month": "sep", "dark_hours": 7.95, "opportunity_nights": 0.62, "cloud_amount_pct": 55.7, "clear_opportunity_nights": 0.27, "moon_free_share": 0.55 }, { "city": "Bemidji", "state": "Minnesota", "month": "oct", "dark_hours": 9.77, "opportunity_nights": 0.95, "cloud_amount_pct": 64.5, "clear_opportunity_nights": 0.34, "moon_free_share": 0.566 }, { "city": "Bemidji", "state": "Minnesota", "month": "nov", "dark_hours": 11.13, "opportunity_nights": 0.98, "cloud_amount_pct": 69.3, "clear_opportunity_nights": 0.3, "moon_free_share": 0.555 }, { "city": "Bemidji", "state": "Minnesota", "month": "dec", "dark_hours": 11.72, "opportunity_nights": 0.26, "cloud_amount_pct": 70.3, "clear_opportunity_nights": 0.08, "moon_free_share": 0.547 }, { "city": "Bend", "state": "Oregon", "month": "jan", "dark_hours": 11.25, "opportunity_nights": 0, "cloud_amount_pct": 75.4, "clear_opportunity_nights": 0, "moon_free_share": 0.547 }, { "city": "Bend", "state": "Oregon", "month": "feb", "dark_hours": 10.25, "opportunity_nights": 0, "cloud_amount_pct": 70.1, "clear_opportunity_nights": 0, "moon_free_share": 0.539 }, { "city": "Bend", "state": "Oregon", "month": "mar", "dark_hours": 8.77, "opportunity_nights": 0.1, "cloud_amount_pct": 71.4, "clear_opportunity_nights": 0.03, "moon_free_share": 0.544 }, { "city": "Bend", "state": "Oregon", "month": "apr", "dark_hours": 6.94, "opportunity_nights": 0, "cloud_amount_pct": 66, "clear_opportunity_nights": 0, "moon_free_share": 0.539 }, { "city": "Bend", "state": "Oregon", "month": "may", "dark_hours": 4.99, "opportunity_nights": 0.1, "cloud_amount_pct": 60.8, "clear_opportunity_nights": 0.04, "moon_free_share": 0.539 }, { "city": "Bend", "state": "Oregon", "month": "jun", "dark_hours": 3.77, 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"clear_opportunity_nights": 0.05, "moon_free_share": 0.542 }, { "city": "Bend", "state": "Oregon", "month": "dec", "dark_hours": 11.56, "opportunity_nights": 0, "cloud_amount_pct": 74.9, "clear_opportunity_nights": 0, "moon_free_share": 0.555 }, { "city": "Berlin", "state": "New Hampshire", "month": "jan", "dark_hours": 11.27, "opportunity_nights": 0.16, "cloud_amount_pct": 73.7, "clear_opportunity_nights": 0.04, "moon_free_share": 0.546 }, { "city": "Berlin", "state": "New Hampshire", "month": "feb", "dark_hours": 10.25, "opportunity_nights": 0, "cloud_amount_pct": 70.3, "clear_opportunity_nights": 0, "moon_free_share": 0.533 }, { "city": "Berlin", "state": "New Hampshire", "month": "mar", "dark_hours": 8.75, "opportunity_nights": 0.13, "cloud_amount_pct": 66.5, "clear_opportunity_nights": 0.04, "moon_free_share": 0.54 }, { "city": "Berlin", "state": "New Hampshire", "month": "apr", "dark_hours": 6.9, "opportunity_nights": 0.26, "cloud_amount_pct": 68.6, "clear_opportunity_nights": 0.08, "moon_free_share": 0.55 }, { "city": "Berlin", "state": "New Hampshire", "month": "may", "dark_hours": 4.9, "opportunity_nights": 0.2, "cloud_amount_pct": 69.3, "clear_opportunity_nights": 0.06, "moon_free_share": 0.529 }, { "city": "Berlin", "state": "New Hampshire", "month": "jun", "dark_hours": 3.63, "opportunity_nights": 0.07, "cloud_amount_pct": 67.4, "clear_opportunity_nights": 0.02, "moon_free_share": 0.518 }, { "city": "Berlin", "state": "New Hampshire", "month": "jul", "dark_hours": 4.36, "opportunity_nights": 0.1, "cloud_amount_pct": 61.8, "clear_opportunity_nights": 0.04, "moon_free_share": 0.522 }, { "city": "Berlin", "state": "New Hampshire", "month": "aug", "dark_hours": 6.29, "opportunity_nights": 0.16, "cloud_amount_pct": 58.9, "clear_opportunity_nights": 0.07, "moon_free_share": 0.577 }, { "city": "Berlin", "state": "New Hampshire", "month": "sep", "dark_hours": 8.2, "opportunity_nights": 0.33, "cloud_amount_pct": 55.8, "clear_opportunity_nights": 0.15, "moon_free_share": 0.559 }, { "city": "Berlin", "state": "New Hampshire", "month": "oct", "dark_hours": 9.82, "opportunity_nights": 0.42, "cloud_amount_pct": 69.4, "clear_opportunity_nights": 0.13, "moon_free_share": 0.541 }, { "city": "Berlin", "state": "New Hampshire", "month": "nov", "dark_hours": 11.02, "opportunity_nights": 0.33, "cloud_amount_pct": 73.6, "clear_opportunity_nights": 0.09, "moon_free_share": 0.536 }, { "city": "Berlin", "state": "New Hampshire", "month": "dec", "dark_hours": 11.59, "opportunity_nights": 0.03, "cloud_amount_pct": 77.8, "clear_opportunity_nights": 0.01, "moon_free_share": 0.547 }, { "city": "Bethel", "state": "Alaska", "month": "jan", "dark_hours": 11.94, "opportunity_nights": 1.01, "cloud_amount_pct": 59.5, "clear_opportunity_nights": 0.41, "moon_free_share": 0.529 }, { "city": "Bethel", "state": "Alaska", "month": "feb", "dark_hours": 10.01, "opportunity_nights": 0.85, "cloud_amount_pct": 68.3, "clear_opportunity_nights": 0.27, "moon_free_share": 0.538 }, { "city": "Bethel", "state": "Alaska", "month": "mar", "dark_hours": 7.07, "opportunity_nights": 1.27, "cloud_amount_pct": 59.1, "clear_opportunity_nights": 0.52, "moon_free_share": 0.55 }, { "city": "Bethel", "state": "Alaska", "month": "apr", "dark_hours": 3.35, "opportunity_nights": 0.39, "cloud_amount_pct": 71.6, "clear_opportunity_nights": 0.11, "moon_free_share": 0.579 }, { "city": "Bethel", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 78.3, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Bethel", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 79.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Bethel", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 83.4, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Bethel", "state": "Alaska", "month": "aug", 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"nov", "dark_hours": 11.1, "opportunity_nights": 0.98, "cloud_amount_pct": 64.3, "clear_opportunity_nights": 0.35, "moon_free_share": 0.555 }, { "city": "Fargo", "state": "North Dakota", "month": "dec", "dark_hours": 11.75, "opportunity_nights": 0.26, "cloud_amount_pct": 68.1, "clear_opportunity_nights": 0.08, "moon_free_share": 0.546 }, { "city": "Fayetteville", "state": "Arkansas", "month": "jan", "dark_hours": 10.96, "opportunity_nights": 0, "cloud_amount_pct": 55.4, "clear_opportunity_nights": 0, "moon_free_share": 0.553 }, { "city": "Fayetteville", "state": "Arkansas", "month": "feb", "dark_hours": 10.21, "opportunity_nights": 0, "cloud_amount_pct": 61.7, "clear_opportunity_nights": 0, "moon_free_share": 0.559 }, { "city": "Fayetteville", "state": "Arkansas", "month": "mar", "dark_hours": 9.13, "opportunity_nights": 0, "cloud_amount_pct": 59.5, "clear_opportunity_nights": 0, "moon_free_share": 0.545 }, { "city": "Fayetteville", "state": "Arkansas", "month": "apr", "dark_hours": 7.81, "opportunity_nights": 0, "cloud_amount_pct": 56.1, "clear_opportunity_nights": 0, "moon_free_share": 0.534 }, { "city": "Fayetteville", "state": "Arkansas", "month": "may", "dark_hours": 6.5, "opportunity_nights": 0, "cloud_amount_pct": 58, "clear_opportunity_nights": 0, "moon_free_share": 0.539 }, { "city": "Fayetteville", "state": "Arkansas", "month": "jun", "dark_hours": 5.81, "opportunity_nights": 0, "cloud_amount_pct": 48.5, "clear_opportunity_nights": 0, "moon_free_share": 0.547 }, { "city": "Fayetteville", "state": "Arkansas", "month": "jul", "dark_hours": 6.19, "opportunity_nights": 0, "cloud_amount_pct": 45.6, "clear_opportunity_nights": 0, "moon_free_share": 0.547 }, { "city": "Fayetteville", "state": "Arkansas", "month": "aug", "dark_hours": 7.4, "opportunity_nights": 0, "cloud_amount_pct": 45.9, "clear_opportunity_nights": 0, "moon_free_share": 0.537 }, { "city": "Fayetteville", "state": "Arkansas", "month": "sep", "dark_hours": 8.74, "opportunity_nights": 0, 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"clear_opportunity_nights": 0, "moon_free_share": 0.536 }, { "city": "Flagstaff", "state": "Arizona", "month": "mar", "dark_hours": 9.15, "opportunity_nights": 0, "cloud_amount_pct": 41.7, "clear_opportunity_nights": 0, "moon_free_share": 0.536 }, { "city": "Flagstaff", "state": "Arizona", "month": "apr", "dark_hours": 7.89, "opportunity_nights": 0, "cloud_amount_pct": 38, "clear_opportunity_nights": 0, "moon_free_share": 0.55 }, { "city": "Flagstaff", "state": "Arizona", "month": "may", "dark_hours": 6.63, "opportunity_nights": 0.03, "cloud_amount_pct": 32.8, "clear_opportunity_nights": 0.02, "moon_free_share": 0.569 }, { "city": "Flagstaff", "state": "Arizona", "month": "jun", "dark_hours": 5.91, "opportunity_nights": 0, "cloud_amount_pct": 24.3, "clear_opportunity_nights": 0, "moon_free_share": 0.545 }, { "city": "Flagstaff", "state": "Arizona", "month": "jul", "dark_hours": 6.33, "opportunity_nights": 0, "cloud_amount_pct": 53.7, "clear_opportunity_nights": 0, "moon_free_share": 0.577 }, { "city": "Flagstaff", "state": "Arizona", "month": "aug", "dark_hours": 7.49, "opportunity_nights": 0, "cloud_amount_pct": 46.6, "clear_opportunity_nights": 0, "moon_free_share": 0.567 }, { "city": "Flagstaff", "state": "Arizona", "month": "sep", "dark_hours": 8.78, "opportunity_nights": 0, "cloud_amount_pct": 30.6, "clear_opportunity_nights": 0, "moon_free_share": 0.552 }, { "city": "Flagstaff", "state": "Arizona", "month": "oct", "dark_hours": 9.91, "opportunity_nights": 0.03, "cloud_amount_pct": 29.6, "clear_opportunity_nights": 0.02, "moon_free_share": 0.539 }, { "city": "Flagstaff", "state": "Arizona", "month": "nov", "dark_hours": 10.77, "opportunity_nights": 0, "cloud_amount_pct": 34.9, "clear_opportunity_nights": 0, "moon_free_share": 0.54 }, { "city": "Flagstaff", "state": "Arizona", "month": "dec", "dark_hours": 11.16, "opportunity_nights": 0, "cloud_amount_pct": 48.1, "clear_opportunity_nights": 0, "moon_free_share": 0.536 }, { "city": "Fort Collins", "state": "Colorado", "month": "jan", "dark_hours": 11.12, "opportunity_nights": 0, "cloud_amount_pct": 60.7, "clear_opportunity_nights": 0, "moon_free_share": 0.537 }, { "city": "Fort Collins", "state": "Colorado", "month": "feb", "dark_hours": 10.24, "opportunity_nights": 0, "cloud_amount_pct": 64.5, "clear_opportunity_nights": 0, "moon_free_share": 0.533 }, { "city": "Fort Collins", "state": "Colorado", "month": "mar", "dark_hours": 8.95, "opportunity_nights": 0.1, "cloud_amount_pct": 64.5, "clear_opportunity_nights": 0.04, "moon_free_share": 0.537 }, { "city": "Fort Collins", "state": "Colorado", "month": "apr", "dark_hours": 7.36, "opportunity_nights": 0.03, "cloud_amount_pct": 66.6, "clear_opportunity_nights": 0.01, "moon_free_share": 0.552 }, { "city": "Fort Collins", "state": "Colorado", "month": "may", "dark_hours": 5.75, "opportunity_nights": 0.1, "cloud_amount_pct": 66.7, "clear_opportunity_nights": 0.03, "moon_free_share": 0.555 }, { "city": "Fort Collins", "state": "Colorado", "month": "jun", "dark_hours": 4.8, "opportunity_nights": 0, "cloud_amount_pct": 50.8, "clear_opportunity_nights": 0, "moon_free_share": 0.516 }, { "city": "Fort Collins", "state": "Colorado", "month": "jul", "dark_hours": 5.36, "opportunity_nights": 0, "cloud_amount_pct": 52.3, "clear_opportunity_nights": 0, "moon_free_share": 0.544 }, { "city": "Fort Collins", "state": "Colorado", "month": "aug", "dark_hours": 6.87, "opportunity_nights": 0.07, "cloud_amount_pct": 55.1, "clear_opportunity_nights": 0.03, "moon_free_share": 0.558 }, { "city": "Fort Collins", "state": "Colorado", "month": "sep", "dark_hours": 8.48, "opportunity_nights": 0.03, "cloud_amount_pct": 46.2, "clear_opportunity_nights": 0.02, "moon_free_share": 0.562 }, { "city": "Fort Collins", "state": "Colorado", "month": "oct", "dark_hours": 9.87, "opportunity_nights": 0.07, "cloud_amount_pct": 51.9, "clear_opportunity_nights": 0.03, "moon_free_share": 0.549 }, { "city": "Fort Collins", "state": "Colorado", "month": "nov", "dark_hours": 10.92, "opportunity_nights": 0.16, "cloud_amount_pct": 55.7, "clear_opportunity_nights": 0.07, "moon_free_share": 0.556 }, { "city": "Fort Collins", "state": "Colorado", "month": "dec", "dark_hours": 11.39, "opportunity_nights": 0.03, "cloud_amount_pct": 62.1, "clear_opportunity_nights": 0.01, "moon_free_share": 0.553 }, { "city": "Fort Worth", "state": "Texas", "month": "jan", "dark_hours": 10.85, "opportunity_nights": 0, "cloud_amount_pct": 47.8, "clear_opportunity_nights": 0, "moon_free_share": 0.558 }, { "city": "Fort Worth", "state": "Texas", "month": "feb", "dark_hours": 10.18, "opportunity_nights": 0, "cloud_amount_pct": 55.2, "clear_opportunity_nights": 0, "moon_free_share": 0.542 }, { "city": "Fort Worth", "state": "Texas", "month": "mar", "dark_hours": 9.23, "opportunity_nights": 0, "cloud_amount_pct": 53.3, "clear_opportunity_nights": 0, "moon_free_share": 0.542 }, { "city": "Fort Worth", "state": "Texas", "month": "apr", "dark_hours": 8.08, "opportunity_nights": 0, "cloud_amount_pct": 51.8, "clear_opportunity_nights": 0, "moon_free_share": 0.546 }, { "city": "Fort Worth", "state": "Texas", "month": "may", "dark_hours": 6.96, "opportunity_nights": 0, "cloud_amount_pct": 54.5, "clear_opportunity_nights": 0, "moon_free_share": 0.54 }, { "city": "Fort Worth", "state": "Texas", "month": "jun", "dark_hours": 6.33, "opportunity_nights": 0, "cloud_amount_pct": 42.5, "clear_opportunity_nights": 0, "moon_free_share": 0.544 }, { "city": "Fort Worth", "state": "Texas", "month": "jul", "dark_hours": 6.68, "opportunity_nights": 0, "cloud_amount_pct": 39.1, "clear_opportunity_nights": 0, "moon_free_share": 0.542 }, { "city": "Fort Worth", "state": "Texas", "month": "aug", "dark_hours": 7.73, "opportunity_nights": 0, "cloud_amount_pct": 38.3, "clear_opportunity_nights": 0, "moon_free_share": 0.549 }, { "city": "Fort Worth", "state": "Texas", "month": "sep", "dark_hours": 8.9, "opportunity_nights": 0, "cloud_amount_pct": 38.5, "clear_opportunity_nights": 0, "moon_free_share": 0.568 }, { "city": "Fort Worth", "state": "Texas", "month": "oct", "dark_hours": 9.92, "opportunity_nights": 0.03, "cloud_amount_pct": 38.3, "clear_opportunity_nights": 0.02, "moon_free_share": 0.568 }, { "city": "Fort Worth", "state": "Texas", "month": "nov", "dark_hours": 10.66, "opportunity_nights": 0, "cloud_amount_pct": 43.1, "clear_opportunity_nights": 0, "moon_free_share": 0.561 }, { "city": "Fort Worth", "state": "Texas", "month": "dec", "dark_hours": 11.02, "opportunity_nights": 0, "cloud_amount_pct": 50.4, "clear_opportunity_nights": 0, "moon_free_share": 0.556 }, { "city": "Fort Yukon", "state": "Alaska", "month": "jan", "dark_hours": 12.26, "opportunity_nights": 27.47, "cloud_amount_pct": 51.8, "clear_opportunity_nights": 13.24, "moon_free_share": 0.534 }, { "city": "Fort Yukon", "state": "Alaska", "month": "feb", "dark_hours": 9.74, "opportunity_nights": 24.64, "cloud_amount_pct": 56.3, "clear_opportunity_nights": 10.77, "moon_free_share": 0.53 }, { "city": "Fort Yukon", "state": "Alaska", "month": "mar", "dark_hours": 5.55, "opportunity_nights": 25.13, "cloud_amount_pct": 44.7, "clear_opportunity_nights": 13.9, "moon_free_share": 0.563 }, { "city": "Fort Yukon", "state": "Alaska", "month": "apr", "dark_hours": 1.16, "opportunity_nights": 0.23, "cloud_amount_pct": 51, "clear_opportunity_nights": 0.11, "moon_free_share": 0.5 }, { "city": "Fort Yukon", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 59.1, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Fort Yukon", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 60.6, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Fort Yukon", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 69.9, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Fort Yukon", "state": "Alaska", "month": "aug", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 69.6, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Fort Yukon", "state": "Alaska", "month": "sep", "dark_hours": 4.43, "opportunity_nights": 16.52, "cloud_amount_pct": 66.6, "clear_opportunity_nights": 5.52, "moon_free_share": 0.58 }, { "city": "Fort Yukon", "state": "Alaska", "month": "oct", "dark_hours": 8.72, "opportunity_nights": 25.26, "cloud_amount_pct": 79, "clear_opportunity_nights": 5.3, "moon_free_share": 0.561 }, { "city": "Fort Yukon", "state": "Alaska", "month": "nov", "dark_hours": 11.7, "opportunity_nights": 24.44, "cloud_amount_pct": 63.3, "clear_opportunity_nights": 8.97, "moon_free_share": 0.538 }, { "city": "Fort Yukon", "state": "Alaska", "month": "dec", "dark_hours": 13.05, "opportunity_nights": 24.74, "cloud_amount_pct": 56, "clear_opportunity_nights": 10.89, "moon_free_share": 0.526 }, { "city": "Fresno", "state": "California", "month": "jan", "dark_hours": 10.98, "opportunity_nights": 0, "cloud_amount_pct": 60.7, "clear_opportunity_nights": 0, "moon_free_share": 0.553 }, { "city": "Fresno", "state": "California", "month": "feb", "dark_hours": 10.22, "opportunity_nights": 0, "cloud_amount_pct": 49.8, "clear_opportunity_nights": 0, "moon_free_share": 0.537 }, { "city": "Fresno", "state": "California", "month": "mar", "dark_hours": 9.1, "opportunity_nights": 0, "cloud_amount_pct": 44.5, "clear_opportunity_nights": 0, "moon_free_share": 0.54 }, { "city": "Fresno", "state": "California", "month": "apr", "dark_hours": 7.74, "opportunity_nights": 0, "cloud_amount_pct": 37.6, "clear_opportunity_nights": 0, "moon_free_share": 0.55 }, { "city": "Fresno", "state": "California", "month": "may", "dark_hours": 6.41, "opportunity_nights": 0.03, "cloud_amount_pct": 26.4, "clear_opportunity_nights": 0.02, "moon_free_share": 0.544 }, { "city": "Fresno", "state": "California", "month": "jun", "dark_hours": 5.63, "opportunity_nights": 0, 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"clear_opportunity_nights": 0, "moon_free_share": 0.537 }, { "city": "Fresno", "state": "California", "month": "dec", "dark_hours": 11.22, "opportunity_nights": 0, "cloud_amount_pct": 58, "clear_opportunity_nights": 0, "moon_free_share": 0.554 }, { "city": "Gakona", "state": "Alaska", "month": "jan", "dark_hours": 12.03, "opportunity_nights": 10.69, "cloud_amount_pct": 63.3, "clear_opportunity_nights": 3.92, "moon_free_share": 0.535 }, { "city": "Gakona", "state": "Alaska", "month": "feb", "dark_hours": 9.95, "opportunity_nights": 9.81, "cloud_amount_pct": 62, "clear_opportunity_nights": 3.73, "moon_free_share": 0.529 }, { "city": "Gakona", "state": "Alaska", "month": "mar", "dark_hours": 6.77, "opportunity_nights": 9.35, "cloud_amount_pct": 53, "clear_opportunity_nights": 4.39, "moon_free_share": 0.549 }, { "city": "Gakona", "state": "Alaska", "month": "apr", "dark_hours": 3.01, "opportunity_nights": 2.05, "cloud_amount_pct": 62.8, "clear_opportunity_nights": 0.76, "moon_free_share": 0.544 }, { "city": "Gakona", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 73.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Gakona", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 78.3, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Gakona", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 80, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Gakona", "state": "Alaska", "month": "aug", "dark_hours": 1.77, "opportunity_nights": 0.81, "cloud_amount_pct": 76.1, "clear_opportunity_nights": 0.19, "moon_free_share": 0.581 }, { "city": "Gakona", "state": "Alaska", "month": "sep", "dark_hours": 5.44, "opportunity_nights": 8.05, "cloud_amount_pct": 74.5, "clear_opportunity_nights": 2.05, "moon_free_share": 0.565 }, { "city": "Gakona", "state": "Alaska", "month": "oct", "dark_hours": 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72.1, "clear_opportunity_nights": 0.24, "moon_free_share": 0.537 }, { "city": "Goodnews Bay", "state": "Alaska", "month": "mar", "dark_hours": 7.35, "opportunity_nights": 1.37, "cloud_amount_pct": 61, "clear_opportunity_nights": 0.53, "moon_free_share": 0.549 }, { "city": "Goodnews Bay", "state": "Alaska", "month": "apr", "dark_hours": 3.66, "opportunity_nights": 0.52, "cloud_amount_pct": 72, "clear_opportunity_nights": 0.15, "moon_free_share": 0.568 }, { "city": "Goodnews Bay", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 77.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Goodnews Bay", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 78.7, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Goodnews Bay", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 81.2, "clear_opportunity_nights": 0, 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"moon_free_share": 0.549 }, { "city": "Grand Forks", "state": "North Dakota", "month": "jan", "dark_hours": 11.41, "opportunity_nights": 0.39, "cloud_amount_pct": 60.9, "clear_opportunity_nights": 0.15, "moon_free_share": 0.547 }, { "city": "Grand Forks", "state": "North Dakota", "month": "feb", "dark_hours": 10.23, "opportunity_nights": 0.2, "cloud_amount_pct": 57.6, "clear_opportunity_nights": 0.08, "moon_free_share": 0.542 }, { "city": "Grand Forks", "state": "North Dakota", "month": "mar", "dark_hours": 8.54, "opportunity_nights": 0.42, "cloud_amount_pct": 64.6, "clear_opportunity_nights": 0.15, "moon_free_share": 0.539 }, { "city": "Grand Forks", "state": "North Dakota", "month": "apr", "dark_hours": 6.37, "opportunity_nights": 0.46, "cloud_amount_pct": 63, "clear_opportunity_nights": 0.17, "moon_free_share": 0.546 }, { "city": "Grand Forks", "state": "North Dakota", "month": "may", "dark_hours": 3.82, "opportunity_nights": 0.65, "cloud_amount_pct": 60.6, 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62.2, "clear_opportunity_nights": 0.36, "moon_free_share": 0.564 }, { "city": "Grand Forks", "state": "North Dakota", "month": "nov", "dark_hours": 11.14, "opportunity_nights": 0.98, "cloud_amount_pct": 66.4, "clear_opportunity_nights": 0.33, "moon_free_share": 0.554 }, { "city": "Grand Forks", "state": "North Dakota", "month": "dec", "dark_hours": 11.81, "opportunity_nights": 0.26, "cloud_amount_pct": 67.5, "clear_opportunity_nights": 0.08, "moon_free_share": 0.546 }, { "city": "Grand Marais", "state": "Minnesota", "month": "jan", "dark_hours": 11.39, "opportunity_nights": 0.39, "cloud_amount_pct": 69.4, "clear_opportunity_nights": 0.12, "moon_free_share": 0.544 }, { "city": "Grand Marais", "state": "Minnesota", "month": "feb", "dark_hours": 10.24, "opportunity_nights": 0.26, "cloud_amount_pct": 66.2, "clear_opportunity_nights": 0.09, "moon_free_share": 0.556 }, { "city": "Grand Marais", "state": "Minnesota", "month": "mar", "dark_hours": 8.55, "opportunity_nights": 0.39, 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"cloud_amount_pct": 80, "clear_opportunity_nights": 0.03, "moon_free_share": 0.547 }, { "city": "Grand Rapids", "state": "Michigan", "month": "feb", "dark_hours": 10.24, "opportunity_nights": 0, "cloud_amount_pct": 75.3, "clear_opportunity_nights": 0, "moon_free_share": 0.555 }, { "city": "Grand Rapids", "state": "Michigan", "month": "mar", "dark_hours": 8.83, "opportunity_nights": 0.1, "cloud_amount_pct": 66.9, "clear_opportunity_nights": 0.03, "moon_free_share": 0.548 }, { "city": "Grand Rapids", "state": "Michigan", "month": "apr", "dark_hours": 7.09, "opportunity_nights": 0.13, "cloud_amount_pct": 63.4, "clear_opportunity_nights": 0.05, "moon_free_share": 0.532 }, { "city": "Grand Rapids", "state": "Michigan", "month": "may", "dark_hours": 5.26, "opportunity_nights": 0.26, "cloud_amount_pct": 63.7, "clear_opportunity_nights": 0.09, "moon_free_share": 0.543 }, { "city": "Grand Rapids", "state": "Michigan", "month": "jun", "dark_hours": 4.12, "opportunity_nights": 0.1, 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0.552 }, { "city": "Las Vegas", "state": "Nevada", "month": "oct", "dark_hours": 9.92, "opportunity_nights": 0.03, "cloud_amount_pct": 31.8, "clear_opportunity_nights": 0.02, "moon_free_share": 0.54 }, { "city": "Las Vegas", "state": "Nevada", "month": "nov", "dark_hours": 10.81, "opportunity_nights": 0, "cloud_amount_pct": 38.8, "clear_opportunity_nights": 0, "moon_free_share": 0.539 }, { "city": "Las Vegas", "state": "Nevada", "month": "dec", "dark_hours": 11.2, "opportunity_nights": 0, "cloud_amount_pct": 49.9, "clear_opportunity_nights": 0, "moon_free_share": 0.535 }, { "city": "Levelock", "state": "Alaska", "month": "jan", "dark_hours": 11.87, "opportunity_nights": 0.95, "cloud_amount_pct": 63.8, "clear_opportunity_nights": 0.34, "moon_free_share": 0.535 }, { "city": "Levelock", "state": "Alaska", "month": "feb", "dark_hours": 10.06, "opportunity_nights": 0.85, "cloud_amount_pct": 70, "clear_opportunity_nights": 0.26, "moon_free_share": 0.53 }, { "city": "Levelock", "state": 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0.26, "cloud_amount_pct": 78.1, "clear_opportunity_nights": 0.06, "moon_free_share": 0.581 }, { "city": "Levelock", "state": "Alaska", "month": "sep", "dark_hours": 6.31, "opportunity_nights": 1.6, "cloud_amount_pct": 74.2, "clear_opportunity_nights": 0.41, "moon_free_share": 0.564 }, { "city": "Levelock", "state": "Alaska", "month": "oct", "dark_hours": 9.35, "opportunity_nights": 1.66, "cloud_amount_pct": 69.8, "clear_opportunity_nights": 0.5, "moon_free_share": 0.549 }, { "city": "Levelock", "state": "Alaska", "month": "nov", "dark_hours": 11.47, "opportunity_nights": 1.96, "cloud_amount_pct": 65.8, "clear_opportunity_nights": 0.67, "moon_free_share": 0.538 }, { "city": "Levelock", "state": "Alaska", "month": "dec", "dark_hours": 12.47, "opportunity_nights": 0.98, "cloud_amount_pct": 69, "clear_opportunity_nights": 0.3, "moon_free_share": 0.551 }, { "city": "Lexington", "state": "Kentucky", "month": "jan", "dark_hours": 11.06, "opportunity_nights": 0, "cloud_amount_pct": 72.3, 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76, "clear_opportunity_nights": 0.11, "moon_free_share": 0.536 }, { "city": "Marquette", "state": "Michigan", "month": "may", "dark_hours": 4.3, "opportunity_nights": 0.65, "cloud_amount_pct": 78.6, "clear_opportunity_nights": 0.14, "moon_free_share": 0.551 }, { "city": "Marquette", "state": "Michigan", "month": "jun", "dark_hours": 2.67, "opportunity_nights": 0.03, "cloud_amount_pct": 76.1, "clear_opportunity_nights": 0.01, "moon_free_share": 0.572 }, { "city": "Marquette", "state": "Michigan", "month": "jul", "dark_hours": 3.64, "opportunity_nights": 0.33, "cloud_amount_pct": 69.8, "clear_opportunity_nights": 0.1, "moon_free_share": 0.567 }, { "city": "Marquette", "state": "Michigan", "month": "aug", "dark_hours": 5.92, "opportunity_nights": 0.42, "cloud_amount_pct": 68.3, "clear_opportunity_nights": 0.13, "moon_free_share": 0.562 }, { "city": "Marquette", "state": "Michigan", "month": "sep", "dark_hours": 8.03, "opportunity_nights": 0.62, "cloud_amount_pct": 67.9, 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"Alaska", "month": "jan", "dark_hours": 12.06, "opportunity_nights": 10.14, "cloud_amount_pct": 59.9, "clear_opportunity_nights": 4.07, "moon_free_share": 0.535 }, { "city": "McGrath", "state": "Alaska", "month": "feb", "dark_hours": 9.92, "opportunity_nights": 9.39, "cloud_amount_pct": 65.8, "clear_opportunity_nights": 3.21, "moon_free_share": 0.533 }, { "city": "McGrath", "state": "Alaska", "month": "mar", "dark_hours": 6.62, "opportunity_nights": 9.22, "cloud_amount_pct": 55.8, "clear_opportunity_nights": 4.08, "moon_free_share": 0.556 }, { "city": "McGrath", "state": "Alaska", "month": "apr", "dark_hours": 2.83, "opportunity_nights": 1.99, "cloud_amount_pct": 64.8, "clear_opportunity_nights": 0.7, "moon_free_share": 0.576 }, { "city": "McGrath", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 75, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "McGrath", "state": "Alaska", "month": "jun", "dark_hours": 0, 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11.39, "opportunity_nights": 2.09, "cloud_amount_pct": 81.9, "clear_opportunity_nights": 0.38, "moon_free_share": 0.547 }, { "city": "Port Alexander", "state": "Alaska", "month": "dec", "dark_hours": 12.24, "opportunity_nights": 0.85, "cloud_amount_pct": 82.1, "clear_opportunity_nights": 0.15, "moon_free_share": 0.538 }, { "city": "Port Angeles", "state": "Washington", "month": "jan", "dark_hours": 11.42, "opportunity_nights": 0.13, "cloud_amount_pct": 83.4, "clear_opportunity_nights": 0.02, "moon_free_share": 0.542 }, { "city": "Port Angeles", "state": "Washington", "month": "feb", "dark_hours": 10.23, "opportunity_nights": 0, "cloud_amount_pct": 76.2, "clear_opportunity_nights": 0, "moon_free_share": 0.546 }, { "city": "Port Angeles", "state": "Washington", "month": "mar", "dark_hours": 8.51, "opportunity_nights": 0.1, "cloud_amount_pct": 78.7, "clear_opportunity_nights": 0.02, "moon_free_share": 0.548 }, { "city": "Port Angeles", "state": "Washington", "month": "apr", "dark_hours": 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85.4, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Port Heiden", "state": "Alaska", "month": "aug", "dark_hours": 3.32, "opportunity_nights": 0.2, "cloud_amount_pct": 84, "clear_opportunity_nights": 0.03, "moon_free_share": 0.566 }, { "city": "Port Heiden", "state": "Alaska", "month": "sep", "dark_hours": 6.74, "opportunity_nights": 0.65, "cloud_amount_pct": 83, "clear_opportunity_nights": 0.11, "moon_free_share": 0.565 }, { "city": "Port Heiden", "state": "Alaska", "month": "oct", "dark_hours": 9.47, "opportunity_nights": 0.49, "cloud_amount_pct": 77.7, "clear_opportunity_nights": 0.11, "moon_free_share": 0.543 }, { "city": "Port Heiden", "state": "Alaska", "month": "nov", "dark_hours": 11.41, "opportunity_nights": 0.88, "cloud_amount_pct": 77.8, "clear_opportunity_nights": 0.2, "moon_free_share": 0.535 }, { "city": "Port Heiden", "state": "Alaska", "month": "dec", "dark_hours": 12.3, "opportunity_nights": 0.2, "cloud_amount_pct": 79.3, 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0, "moon_free_share": null }, { "city": "Port Lions", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 76.9, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Port Lions", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 76.1, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Port Lions", "state": "Alaska", "month": "aug", "dark_hours": 3.14, "opportunity_nights": 0.29, "cloud_amount_pct": 74.1, "clear_opportunity_nights": 0.08, "moon_free_share": 0.592 }, { "city": "Port Lions", "state": "Alaska", "month": "sep", "dark_hours": 6.56, "opportunity_nights": 1.53, "cloud_amount_pct": 72.7, "clear_opportunity_nights": 0.42, "moon_free_share": 0.56 }, { "city": "Port Lions", "state": "Alaska", "month": "oct", "dark_hours": 9.42, "opportunity_nights": 1.66, "cloud_amount_pct": 71.7, "clear_opportunity_nights": 0.47, "moon_free_share": 0.552 }, { "city": "Port 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"clear_opportunity_nights": 0.01, "moon_free_share": 0.553 }, { "city": "Portland", "state": "Maine", "month": "jan", "dark_hours": 11.27, "opportunity_nights": 0.13, "cloud_amount_pct": 65.5, "clear_opportunity_nights": 0.04, "moon_free_share": 0.541 }, { "city": "Portland", "state": "Maine", "month": "feb", "dark_hours": 10.24, "opportunity_nights": 0, "cloud_amount_pct": 63.5, "clear_opportunity_nights": 0, "moon_free_share": 0.534 }, { "city": "Portland", "state": "Maine", "month": "mar", "dark_hours": 8.8, "opportunity_nights": 0.13, "cloud_amount_pct": 61.6, "clear_opportunity_nights": 0.05, "moon_free_share": 0.539 }, { "city": "Portland", "state": "Maine", "month": "apr", "dark_hours": 7.01, "opportunity_nights": 0.26, "cloud_amount_pct": 61.5, "clear_opportunity_nights": 0.1, "moon_free_share": 0.55 }, { "city": "Portland", "state": "Maine", "month": "may", "dark_hours": 5.1, "opportunity_nights": 0.2, "cloud_amount_pct": 65.8, "clear_opportunity_nights": 0.07, 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"moon_free_share": 0.56 }, { "city": "Raleigh", "state": "North Carolina", "month": "sep", "dark_hours": 8.75, "opportunity_nights": 0, "cloud_amount_pct": 50.7, "clear_opportunity_nights": 0, "moon_free_share": 0.555 }, { "city": "Raleigh", "state": "North Carolina", "month": "oct", "dark_hours": 9.91, "opportunity_nights": 0.03, "cloud_amount_pct": 45.5, "clear_opportunity_nights": 0.02, "moon_free_share": 0.542 }, { "city": "Raleigh", "state": "North Carolina", "month": "nov", "dark_hours": 10.77, "opportunity_nights": 0, "cloud_amount_pct": 45, "clear_opportunity_nights": 0, "moon_free_share": 0.547 }, { "city": "Raleigh", "state": "North Carolina", "month": "dec", "dark_hours": 11.17, "opportunity_nights": 0, "cloud_amount_pct": 54.1, "clear_opportunity_nights": 0, "moon_free_share": 0.563 }, { "city": "Rampart", "state": "Alaska", "month": "jan", "dark_hours": 12.2, "opportunity_nights": 19.52, "cloud_amount_pct": 52.4, "clear_opportunity_nights": 9.29, "moon_free_share": 0.533 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"cloud_amount_pct": 56.4, "clear_opportunity_nights": 7.56, "moon_free_share": 0.534 }, { "city": "Rangeley", "state": "Maine", "month": "jan", "dark_hours": 11.31, "opportunity_nights": 0.36, "cloud_amount_pct": 67.4, "clear_opportunity_nights": 0.12, "moon_free_share": 0.545 }, { "city": "Rangeley", "state": "Maine", "month": "feb", "dark_hours": 10.24, "opportunity_nights": 0.26, "cloud_amount_pct": 63.4, "clear_opportunity_nights": 0.1, "moon_free_share": 0.533 }, { "city": "Rangeley", "state": "Maine", "month": "mar", "dark_hours": 8.73, "opportunity_nights": 0.46, "cloud_amount_pct": 62.3, "clear_opportunity_nights": 0.17, "moon_free_share": 0.539 }, { "city": "Rangeley", "state": "Maine", "month": "apr", "dark_hours": 6.82, "opportunity_nights": 0.49, "cloud_amount_pct": 65.9, "clear_opportunity_nights": 0.17, "moon_free_share": 0.55 }, { "city": "Rangeley", "state": "Maine", "month": "may", "dark_hours": 4.77, "opportunity_nights": 0.49, "cloud_amount_pct": 68.2, 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"moon_free_share": 0.542 }, { "city": "Rangeley", "state": "Maine", "month": "nov", "dark_hours": 11.06, "opportunity_nights": 0.91, "cloud_amount_pct": 66.3, "clear_opportunity_nights": 0.31, "moon_free_share": 0.536 }, { "city": "Rangeley", "state": "Maine", "month": "dec", "dark_hours": 11.65, "opportunity_nights": 0.26, "cloud_amount_pct": 68.4, "clear_opportunity_nights": 0.08, "moon_free_share": 0.545 }, { "city": "Rapid City", "state": "South Dakota", "month": "jan", "dark_hours": 11.27, "opportunity_nights": 0.16, "cloud_amount_pct": 65.1, "clear_opportunity_nights": 0.06, "moon_free_share": 0.546 }, { "city": "Rapid City", "state": "South Dakota", "month": "feb", "dark_hours": 10.24, "opportunity_nights": 0, "cloud_amount_pct": 67.2, "clear_opportunity_nights": 0, "moon_free_share": 0.532 }, { "city": "Rapid City", "state": "South Dakota", "month": "mar", "dark_hours": 8.78, "opportunity_nights": 0.1, "cloud_amount_pct": 65.6, "clear_opportunity_nights": 0.03, 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0.09, "moon_free_share": 0.546 }, { "city": "Rapid City", "state": "South Dakota", "month": "sep", "dark_hours": 8.24, "opportunity_nights": 0.23, "cloud_amount_pct": 44.3, "clear_opportunity_nights": 0.13, "moon_free_share": 0.569 }, { "city": "Rapid City", "state": "South Dakota", "month": "oct", "dark_hours": 9.83, "opportunity_nights": 0.33, "cloud_amount_pct": 55.6, "clear_opportunity_nights": 0.15, "moon_free_share": 0.554 }, { "city": "Rapid City", "state": "South Dakota", "month": "nov", "dark_hours": 11.03, "opportunity_nights": 0.36, "cloud_amount_pct": 59.7, "clear_opportunity_nights": 0.15, "moon_free_share": 0.553 }, { "city": "Rapid City", "state": "South Dakota", "month": "dec", "dark_hours": 11.61, "opportunity_nights": 0.03, "cloud_amount_pct": 65.1, "clear_opportunity_nights": 0.01, "moon_free_share": 0.548 }, { "city": "Red Devil", "state": "Alaska", "month": "jan", "dark_hours": 12, "opportunity_nights": 3.68, "cloud_amount_pct": 60.8, "clear_opportunity_nights": 1.44, "moon_free_share": 0.534 }, { "city": "Red Devil", "state": "Alaska", "month": "feb", "dark_hours": 9.97, "opportunity_nights": 3.39, "cloud_amount_pct": 68.1, "clear_opportunity_nights": 1.08, "moon_free_share": 0.533 }, { "city": "Red Devil", "state": "Alaska", "month": "mar", "dark_hours": 6.88, "opportunity_nights": 3.49, "cloud_amount_pct": 55.1, "clear_opportunity_nights": 1.57, "moon_free_share": 0.555 }, { "city": "Red Devil", "state": "Alaska", "month": "apr", "dark_hours": 3.13, "opportunity_nights": 1.17, "cloud_amount_pct": 64.2, "clear_opportunity_nights": 0.42, "moon_free_share": 0.563 }, { "city": "Red Devil", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 72.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Red Devil", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 77.7, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Red 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"dark_hours": 12.65, "opportunity_nights": 4.11, "cloud_amount_pct": 67.9, "clear_opportunity_nights": 1.32, "moon_free_share": 0.548 }, { "city": "Redding", "state": "California", "month": "jan", "dark_hours": 11.13, "opportunity_nights": 0, "cloud_amount_pct": 60.5, "clear_opportunity_nights": 0, "moon_free_share": 0.549 }, { "city": "Redding", "state": "California", "month": "feb", "dark_hours": 10.24, "opportunity_nights": 0, "cloud_amount_pct": 57.6, "clear_opportunity_nights": 0, "moon_free_share": 0.542 }, { "city": "Redding", "state": "California", "month": "mar", "dark_hours": 8.94, "opportunity_nights": 0, "cloud_amount_pct": 57.6, "clear_opportunity_nights": 0, "moon_free_share": 0.542 }, { "city": "Redding", "state": "California", "month": "apr", "dark_hours": 7.36, "opportunity_nights": 0, "cloud_amount_pct": 50.4, "clear_opportunity_nights": 0, "moon_free_share": 0.544 }, { "city": "Redding", "state": "California", "month": "may", "dark_hours": 5.75, "opportunity_nights": 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"clear_opportunity_nights": 0.14, "moon_free_share": 0.536 }, { "city": "Yakima", "state": "Washington", "month": "nov", "dark_hours": 11.11, "opportunity_nights": 0.36, "cloud_amount_pct": 70.7, "clear_opportunity_nights": 0.11, "moon_free_share": 0.541 }, { "city": "Yakima", "state": "Washington", "month": "dec", "dark_hours": 11.71, "opportunity_nights": 0.03, "cloud_amount_pct": 74.2, "clear_opportunity_nights": 0.01, "moon_free_share": 0.553 }, { "city": "Yakutat", "state": "Alaska", "month": "jan", "dark_hours": 11.89, "opportunity_nights": 10.69, "cloud_amount_pct": 77.2, "clear_opportunity_nights": 2.44, "moon_free_share": 0.535 }, { "city": "Yakutat", "state": "Alaska", "month": "feb", "dark_hours": 10.05, "opportunity_nights": 10.56, "cloud_amount_pct": 74.2, "clear_opportunity_nights": 2.72, "moon_free_share": 0.537 }, { "city": "Yakutat", "state": "Alaska", "month": "mar", "dark_hours": 7.29, "opportunity_nights": 9.16, "cloud_amount_pct": 73, "clear_opportunity_nights": 2.47, "moon_free_share": 0.541 }, { "city": "Yakutat", "state": "Alaska", "month": "apr", "dark_hours": 3.59, "opportunity_nights": 4.17, "cloud_amount_pct": 73.9, "clear_opportunity_nights": 1.09, "moon_free_share": 0.56 }, { "city": "Yakutat", "state": "Alaska", "month": "may", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 77, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Yakutat", "state": "Alaska", "month": "jun", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 81.5, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Yakutat", "state": "Alaska", "month": "jul", "dark_hours": 0, "opportunity_nights": 0, "cloud_amount_pct": 82.1, "clear_opportunity_nights": 0, "moon_free_share": null }, { "city": "Yakutat", "state": "Alaska", "month": "aug", "dark_hours": 2.75, "opportunity_nights": 2.02, "cloud_amount_pct": 79.5, "clear_opportunity_nights": 0.41, "moon_free_share": 0.573 }, { "city": "Yakutat", "state": "Alaska", "month": "sep", "dark_hours": 6.2, "opportunity_nights": 8.67, "cloud_amount_pct": 78.1, "clear_opportunity_nights": 1.9, "moon_free_share": 0.562 }, { "city": "Yakutat", "state": "Alaska", "month": "oct", "dark_hours": 9.32, "opportunity_nights": 10.59, "cloud_amount_pct": 78.1, "clear_opportunity_nights": 2.32, "moon_free_share": 0.556 }, { "city": "Yakutat", "state": "Alaska", "month": "nov", "dark_hours": 11.48, "opportunity_nights": 10.27, "cloud_amount_pct": 77.4, "clear_opportunity_nights": 2.32, "moon_free_share": 0.543 }, { "city": "Yakutat", "state": "Alaska", "month": "dec", "dark_hours": 12.49, "opportunity_nights": 9.09, "cloud_amount_pct": 79.5, "clear_opportunity_nights": 1.86, "moon_free_share": 0.534 } ], "cities": [ { "slug": "aberdeen", "name": "Aberdeen", "state": "South Dakota", "lat": 45.4647, "lon": -98.4865, "magnetic_lat": 53.7, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.18, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "adak", "name": "Adak", "state": "Alaska", "lat": 51.9099, "lon": -176.5981, "magnetic_lat": 48.8, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 22.9 }, "best_months": [ "nov", "aug", "oct" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0.1, "verdict": "storm_only", "last_threshold_date": "2025-01-01", "last_noticeable_date": "2024-05-11" }, { "slug": "akhiok", "name": "Akhiok", "state": "Alaska", "lat": 56.9483, "lon": -154.2153, "magnetic_lat": 57.1, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "nov", "oct" ], "peak_clear_nights": 0.37, "clear_nights_per_year": 1.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "akiachak", "name": "Akiachak", "state": "Alaska", "lat": 60.921, "lon": -161.4021, "magnetic_lat": 59.8, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 0.51, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "akiak", "name": "Akiak", "state": "Alaska", "lat": 60.9094, "lon": -161.216, "magnetic_lat": 59.8, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 0.52, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "akutan", "name": "Akutan", "state": "Alaska", "lat": 54.14, "lon": -165.763, "magnetic_lat": 52.6, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 67.6 }, "best_months": [ "nov", "mar", "sep" ], "peak_clear_nights": 0.03, "clear_nights_per_year": 0.1, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-01-01" }, { "slug": "alakanuk", "name": "Alakanuk", "state": "Alaska", "lat": 62.711, "lon": -164.6497, "magnetic_lat": 61, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 6.7, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "alatna", "name": "Alatna", "state": "Alaska", "lat": 66.5638, "lon": -152.8385, "magnetic_lat": 66.4, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 14.01, "clear_nights_per_year": 71.6, "verdict": "regular", "last_threshold_date": "2026-04-02", "last_noticeable_date": "2026-04-02" }, { "slug": "albany", "name": "Albany", "state": "New York", "lat": 42.6526, "lon": -73.7562, "magnetic_lat": 52, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 43.9 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.16, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "albuquerque", "name": "Albuquerque", "state": "New Mexico", "lat": 35.0844, "lon": -106.6504, "magnetic_lat": 42.6, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 5.5 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "aleknagik", "name": "Aleknagik", "state": "Alaska", "lat": 59.289, "lon": -158.6643, "magnetic_lat": 58.7, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.67, "clear_nights_per_year": 3.4, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "allakaket", "name": "Allakaket", "state": "Alaska", "lat": 66.542, "lon": -152.583, "magnetic_lat": 66.4, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 14.01, "clear_nights_per_year": 71.7, "verdict": "regular", "last_threshold_date": "2026-04-02", "last_noticeable_date": "2026-04-02" }, { "slug": "alpena", "name": "Alpena", "state": "Michigan", "lat": 45.0617, "lon": -83.4327, "magnetic_lat": 54.2, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 50.4 }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.24, "clear_nights_per_year": 1.4, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "ambler", "name": "Ambler", "state": "Alaska", "lat": 67.0909, "lon": -157.8871, "magnetic_lat": 66.1, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 14.94, "clear_nights_per_year": 74, "verdict": "regular", "last_threshold_date": "2026-04-01", "last_noticeable_date": "2026-03-30" }, { "slug": "anaktuvuk-pass", "name": "Anaktuvuk Pass", "state": "Alaska", "lat": 68.1498, "lon": -151.6971, "magnetic_lat": 68, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "dec", "mar" ], "peak_clear_nights": 14.2, "clear_nights_per_year": 68, "verdict": "regular", "last_threshold_date": "2026-03-29", "last_noticeable_date": "2026-03-28" }, { "slug": "anchorage", "name": "Anchorage", "state": "Alaska", "lat": 61.2181, "lon": -149.9003, "magnetic_lat": 61.9, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "jan" ], "peak_clear_nights": 1.41, "clear_nights_per_year": 8.5, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-25" }, { "slug": "anderson", "name": "Anderson", "state": "Alaska", "lat": 64.3083, "lon": -149.1632, "magnetic_lat": 64.9, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 8.72, "clear_nights_per_year": 45.2, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "angoon", "name": "Angoon", "state": "Alaska", "lat": 57.4413, "lon": -134.4784, "magnetic_lat": 60.8, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.16, "clear_nights_per_year": 7.3, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "aniak", "name": "Aniak", "state": "Alaska", "lat": 61.5788, "lon": -159.5474, "magnetic_lat": 60.7, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.53, "clear_nights_per_year": 9.3, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "anvik", "name": "Anvik", "state": "Alaska", "lat": 62.6316, "lon": -160.2151, "magnetic_lat": 61.6, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.64, "clear_nights_per_year": 9.5, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "arlington", "name": "Arlington", "state": "Texas", "lat": 32.7357, "lon": -97.1081, "magnetic_lat": 41.1, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 3.1 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "atka", "name": "Atka", "state": "Alaska", "lat": 52.2115, "lon": -174.2135, "magnetic_lat": 49.5, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 32.4 }, "best_months": [ "nov", "sep", "oct" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2025-01-01", "last_noticeable_date": "2024-05-11" }, { "slug": "atlanta", "name": "Atlanta", "state": "Georgia", "lat": 33.749, "lon": -84.388, "magnetic_lat": 42.9, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 6.1 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "atlantic-city", "name": "Atlantic City", "state": "New Jersey", "lat": 39.3643, "lon": -74.4229, "magnetic_lat": 48.7, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 21.9 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "atqasuk", "name": "Atqasuk", "state": "Alaska", "lat": 70.4808, "lon": -157.3255, "magnetic_lat": 69.2, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "feb", "dec" ], "peak_clear_nights": 11.84, "clear_nights_per_year": 45.1, "verdict": "regular", "last_threshold_date": "2026-03-24", "last_noticeable_date": "2026-03-24" }, { "slug": "austin", "name": "Austin", "state": "Texas", "lat": 30.2672, "lon": -97.7431, "magnetic_lat": 38.6, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 0.2 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "baltimore", "name": "Baltimore", "state": "Maryland", "lat": 39.2904, "lon": -76.6122, "magnetic_lat": 48.6, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 21 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "bangor", "name": "Bangor", "state": "Maine", "lat": 44.8016, "lon": -68.7712, "magnetic_lat": 54.1, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 47 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.1, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "bar-harbor", "name": "Bar Harbor", "state": "Maine", "lat": 44.3876, "lon": -68.2039, "magnetic_lat": 53.7, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.16, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "barrow", "name": "Barrow", "state": "Alaska", "lat": 71.2906, "lon": -156.7886, "magnetic_lat": 70, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "feb", "dec" ], "peak_clear_nights": 10.51, "clear_nights_per_year": 38.2, "verdict": "regular", "last_threshold_date": "2026-03-21", "last_noticeable_date": "2026-03-21" }, { "slug": "baton-rouge", "name": "Baton Rouge", "state": "Louisiana", "lat": 30.4515, "lon": -91.1871, "magnetic_lat": 39.3, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 0.9 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "bayfield", "name": "Bayfield", "state": "Wisconsin", "lat": 46.811, "lon": -90.819, "magnetic_lat": 55.6, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.3, "clear_nights_per_year": 1.9, "verdict": "few_nights", "last_threshold_date": "2026-03-14", "last_noticeable_date": "2026-01-21" }, { "slug": "beaver", "name": "Beaver", "state": "Alaska", "lat": 66.363, "lon": -147.3967, "magnetic_lat": 67.1, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 14.04, "clear_nights_per_year": 69, "verdict": "regular", "last_threshold_date": "2026-04-02", "last_noticeable_date": "2026-04-02" }, { "slug": "bellingham", "name": "Bellingham", "state": "Washington", "lat": 48.7519, "lon": -122.4787, "magnetic_lat": 54.2, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 50.4 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.33, "clear_nights_per_year": 1.5, "verdict": "few_nights", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "bemidji", "name": "Bemidji", "state": "Minnesota", "lat": 47.4736, "lon": -94.8803, "magnetic_lat": 56, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.34, "clear_nights_per_year": 2.1, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "bend", "name": "Bend", "state": "Oregon", "lat": 44.0582, "lon": -121.3153, "magnetic_lat": 49.8, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 38.7 }, "best_months": [ "nov", "may", "mar" ], "peak_clear_nights": 0.05, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2024-05-11" }, { "slug": "berlin-nh", "name": "Berlin", "state": "New Hampshire", "lat": 44.4687, "lon": -71.1851, "magnetic_lat": 53.8, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "bethel", "name": "Bethel", "state": "Alaska", "lat": 60.7994, "lon": -161.7558, "magnetic_lat": 59.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 0.52, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "bettles", "name": "Bettles", "state": "Alaska", "lat": 66.9139, "lon": -151.5181, "magnetic_lat": 66.9, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 13.54, "clear_nights_per_year": 68.2, "verdict": "regular", "last_threshold_date": "2026-04-01", "last_noticeable_date": "2026-03-30" }, { "slug": "billings", "name": "Billings", "state": "Montana", "lat": 45.7833, "lon": -108.5007, "magnetic_lat": 53, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.12, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "birmingham", "name": "Birmingham", "state": "Alabama", "lat": 33.5186, "lon": -86.8104, "magnetic_lat": 42.5, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 5.3 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "bismarck", "name": "Bismarck", "state": "North Dakota", "lat": 46.8083, "lon": -100.7837, "magnetic_lat": 54.8, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 78.4 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.41, "clear_nights_per_year": 2.5, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "boise", "name": "Boise", "state": "Idaho", "lat": 43.615, "lon": -116.2023, "magnetic_lat": 50, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 43.9 }, "best_months": [ "nov", "may", "aug" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "boston", "name": "Boston", "state": "Massachusetts", "lat": 42.3601, "lon": -71.0589, "magnetic_lat": 51.7, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.17, "clear_nights_per_year": 0.9, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "boulder", "name": "Boulder", "state": "Colorado", "lat": 40.015, "lon": -105.2705, "magnetic_lat": 47.7, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "bozeman", "name": "Bozeman", "state": "Montana", "lat": 45.677, "lon": -111.0429, "magnetic_lat": 52.6, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 67.6 }, "best_months": [ "sep", "oct", "aug" ], "peak_clear_nights": 0.12, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "brevig-mission", "name": "Brevig Mission", "state": "Alaska", "lat": 65.3311, "lon": -166.4931, "magnetic_lat": 63.1, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "feb", "mar" ], "peak_clear_nights": 3.5, "clear_nights_per_year": 18.1, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "buckland", "name": "Buckland", "state": "Alaska", "lat": 65.9817, "lon": -161.1492, "magnetic_lat": 64.6, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "dec", "mar" ], "peak_clear_nights": 9.18, "clear_nights_per_year": 44.7, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "buffalo", "name": "Buffalo", "state": "New York", "lat": 42.8864, "lon": -78.8784, "magnetic_lat": 52.2, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 50.4 }, "best_months": [ "sep", "oct", "may" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "burlington", "name": "Burlington", "state": "Vermont", "lat": 44.4759, "lon": -73.2121, "magnetic_lat": 53.8, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "caribou", "name": "Caribou", "state": "Maine", "lat": 46.8606, "lon": -68.0117, "magnetic_lat": 56.2, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.36, "clear_nights_per_year": 2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "casper", "name": "Casper", "state": "Wyoming", "lat": 42.8666, "lon": -106.3131, "magnetic_lat": 50.4, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 58.2 }, "best_months": [ "nov", "may", "aug" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "cedar-rapids", "name": "Cedar Rapids", "state": "Iowa", "lat": 41.9778, "lon": -91.6656, "magnetic_lat": 50.7, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 72.8 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "chalkyitsik", "name": "Chalkyitsik", "state": "Alaska", "lat": 66.645, "lon": -143.7403, "magnetic_lat": 67.9, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 13.77, "clear_nights_per_year": 69.8, "verdict": "regular", "last_threshold_date": "2026-04-01", "last_noticeable_date": "2026-03-30" }, { "slug": "charleston-sc", "name": "Charleston", "state": "South Carolina", "lat": 32.7765, "lon": -79.9311, "magnetic_lat": 42, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 4.5 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "charleston-wv", "name": "Charleston", "state": "West Virginia", "lat": 38.3498, "lon": -81.6326, "magnetic_lat": 47.6, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 34.3 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "charlotte", "name": "Charlotte", "state": "North Carolina", "lat": 35.2271, "lon": -80.8431, "magnetic_lat": 44.5, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 10 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "chefornak", "name": "Chefornak", "state": "Alaska", "lat": 60.1492, "lon": -164.2858, "magnetic_lat": 58.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.37, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "chevak", "name": "Chevak", "state": "Alaska", "lat": 61.5408, "lon": -165.5847, "magnetic_lat": 59.7, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 0.51, "clear_nights_per_year": 2.6, "verdict": "few_nights", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-03-22" }, { "slug": "cheyenne", "name": "Cheyenne", "state": "Wyoming", "lat": 41.14, "lon": -104.8197, "magnetic_lat": 48.8, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 22.9 }, "best_months": [ "nov", "mar", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "chicago", "name": "Chicago", "state": "Illinois", "lat": 41.8781, "lon": -87.6298, "magnetic_lat": 50.9, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 84.1 }, "best_months": [ "oct", "nov", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "chicken", "name": "Chicken", "state": "Alaska", "lat": 64.0731, "lon": -141.9322, "magnetic_lat": 65.9, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 8.74, "clear_nights_per_year": 46.2, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "chignik", "name": "Chignik", "state": "Alaska", "lat": 56.3056, "lon": -158.4014, "magnetic_lat": 55.9, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "sep" ], "peak_clear_nights": 0.2, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "chignik-lagoon", "name": "Chignik Lagoon", "state": "Alaska", "lat": 56.3111, "lon": -158.5361, "magnetic_lat": 55.8, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "sep" ], "peak_clear_nights": 0.2, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "chignik-lake", "name": "Chignik Lake", "state": "Alaska", "lat": 56.2556, "lon": -158.775, "magnetic_lat": 55.8, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "sep" ], "peak_clear_nights": 0.19, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "chistochina", "name": "Chistochina", "state": "Alaska", "lat": 62.5672, "lon": -144.6694, "magnetic_lat": 64, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 8.3, "clear_nights_per_year": 43.4, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "chitina", "name": "Chitina", "state": "Alaska", "lat": 61.5156, "lon": -144.4392, "magnetic_lat": 63.1, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 3.96, "clear_nights_per_year": 22, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "chuathbaluk", "name": "Chuathbaluk", "state": "Alaska", "lat": 61.5792, "lon": -159.2208, "magnetic_lat": 60.7, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.55, "clear_nights_per_year": 9.3, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "circle", "name": "Circle", "state": "Alaska", "lat": 65.8278, "lon": -144.0642, "magnetic_lat": 67.1, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 13.5, "clear_nights_per_year": 68, "verdict": "regular", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-04-03" }, { "slug": "clarks-point", "name": "Clark's Point", "state": "Alaska", "lat": 58.8364, "lon": -158.5553, "magnetic_lat": 58.3, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.45, "clear_nights_per_year": 2.5, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "cleveland", "name": "Cleveland", "state": "Ohio", "lat": 41.4993, "lon": -81.6944, "magnetic_lat": 50.7, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 72.8 }, "best_months": [ "oct", "nov", "may" ], "peak_clear_nights": 0.05, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "cody", "name": "Cody", "state": "Wyoming", "lat": 44.5263, "lon": -109.0565, "magnetic_lat": 51.7, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.12, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "coeur-dalene", "name": "Coeur d'Alene", "state": "Idaho", "lat": 47.6777, "lon": -116.7804, "magnetic_lat": 53.9, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "aug", "oct", "sep" ], "peak_clear_nights": 0.13, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "coffman-cove", "name": "Coffman Cove", "state": "Alaska", "lat": 56.0097, "lon": -132.8331, "magnetic_lat": 59.7, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.44, "clear_nights_per_year": 2.5, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "cold-bay", "name": "Cold Bay", "state": "Alaska", "lat": 55.2061, "lon": -162.7214, "magnetic_lat": 54.1, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 47 }, "best_months": [ "mar", "nov", "sep" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "colorado-springs", "name": "Colorado Springs", "state": "Colorado", "lat": 38.8339, "lon": -104.8214, "magnetic_lat": 46.5, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 20.2 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "columbia", "name": "Columbia", "state": "South Carolina", "lat": 34.0007, "lon": -81.0348, "magnetic_lat": 43.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 6.7 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "columbus", "name": "Columbus", "state": "Ohio", "lat": 39.9612, "lon": -82.9988, "magnetic_lat": 49.1, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 26.4 }, "best_months": [ "oct", "nov", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "concord", "name": "Concord", "state": "New Hampshire", "lat": 43.2081, "lon": -71.5376, "magnetic_lat": 52.6, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 67.6 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.16, "clear_nights_per_year": 0.9, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "copper-harbor", "name": "Copper Harbor", "state": "Michigan", "lat": 47.4711, "lon": -87.8861, "magnetic_lat": 56.4, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.19, "clear_nights_per_year": 0.9, "verdict": "storm_only", "last_threshold_date": "2026-03-14", "last_noticeable_date": "2026-01-21" }, { "slug": "cordova", "name": "Cordova", "state": "Alaska", "lat": 60.5422, "lon": -145.7575, "magnetic_lat": 61.9, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 7.4, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-04-03" }, { "slug": "craig", "name": "Craig", "state": "Alaska", "lat": 55.4781, "lon": -133.1486, "magnetic_lat": 59.1, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.47, "clear_nights_per_year": 2.6, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "crooked-creek", "name": "Crooked Creek", "state": "Alaska", "lat": 61.8681, "lon": -158.1356, "magnetic_lat": 61.2, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.55, "clear_nights_per_year": 9.2, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "cumberland", "name": "Cumberland", "state": "Maryland", "lat": 39.6529, "lon": -78.7625, "magnetic_lat": 48.9, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 24 }, "best_months": [ "oct", "nov", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "dallas", "name": "Dallas", "state": "Texas", "lat": 32.7767, "lon": -96.797, "magnetic_lat": 41.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 3.3 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "deering", "name": "Deering", "state": "Alaska", "lat": 66.0692, "lon": -162.7661, "magnetic_lat": 64.4, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 7.3, "clear_nights_per_year": 36.1, "verdict": "regular", "last_threshold_date": "2026-04-04", "last_noticeable_date": "2026-04-03" }, { "slug": "delta-junction", "name": "Delta Junction", "state": "Alaska", "lat": 64.0372, "lon": -145.7342, "magnetic_lat": 65.2, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 9.08, "clear_nights_per_year": 47.8, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "denver", "name": "Denver", "state": "Colorado", "lat": 39.7392, "lon": -104.9903, "magnetic_lat": 47.4, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 30.7 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "des-moines", "name": "Des Moines", "state": "Iowa", "lat": 41.5868, "lon": -93.625, "magnetic_lat": 50.2, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 50.4 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.08, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "detroit", "name": "Detroit", "state": "Michigan", "lat": 42.3314, "lon": -83.0458, "magnetic_lat": 51.5, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 32.4 }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "dillingham", "name": "Dillingham", "state": "Alaska", "lat": 59.0394, "lon": -158.4575, "magnetic_lat": 58.5, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.67, "clear_nights_per_year": 3.4, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "diomede", "name": "Diomede", "state": "Alaska", "lat": 65.7592, "lon": -168.9581, "magnetic_lat": 63.2, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "jan", "mar" ], "peak_clear_nights": 2.86, "clear_nights_per_year": 14, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-04-03" }, { "slug": "dot-lake", "name": "Dot Lake", "state": "Alaska", "lat": 63.6617, "lon": -144.0706, "magnetic_lat": 65.1, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 8.1, "clear_nights_per_year": 43.7, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "duluth", "name": "Duluth", "state": "Minnesota", "lat": 46.7833, "lon": -92.1065, "magnetic_lat": 55.5, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.34, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "eagle", "name": "Eagle", "state": "Alaska", "lat": 64.7878, "lon": -141.1997, "magnetic_lat": 66.6, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 13.19, "clear_nights_per_year": 66.2, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "eagle-river", "name": "Eagle River", "state": "Wisconsin", "lat": 45.9172, "lon": -89.2443, "magnetic_lat": 54.8, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 78.4 }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.33, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "eek", "name": "Eek", "state": "Alaska", "lat": 60.2136, "lon": -162.0269, "magnetic_lat": 59, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.48, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "egegik", "name": "Egegik", "state": "Alaska", "lat": 58.2156, "lon": -157.3756, "magnetic_lat": 57.8, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.54, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "ekwok", "name": "Ekwok", "state": "Alaska", "lat": 59.3506, "lon": -157.4753, "magnetic_lat": 58.9, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.67, "clear_nights_per_year": 3.3, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "el-paso", "name": "El Paso", "state": "Texas", "lat": 31.7619, "lon": -106.485, "magnetic_lat": 39.4, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 1 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "elim", "name": "Elim", "state": "Alaska", "lat": 64.6203, "lon": -162.2614, "magnetic_lat": 63.1, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 3.88, "clear_nights_per_year": 22.2, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "ely", "name": "Ely", "state": "Minnesota", "lat": 47.9032, "lon": -91.8671, "magnetic_lat": 56.6, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.28, "clear_nights_per_year": 1.7, "verdict": "few_nights", "last_threshold_date": "2026-03-14", "last_noticeable_date": "2026-01-21" }, { "slug": "emmonak", "name": "Emmonak", "state": "Alaska", "lat": 62.7844, "lon": -164.5331, "magnetic_lat": 61.1, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 6.7, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "erie", "name": "Erie", "state": "Pennsylvania", "lat": 42.1292, "lon": -80.0851, "magnetic_lat": 51.4, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 30.7 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "eugene", "name": "Eugene", "state": "Oregon", "lat": 44.0521, "lon": -123.0868, "magnetic_lat": 49.5, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 32.4 }, "best_months": [ "may", "nov", "oct" ], "peak_clear_nights": 0.04, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2024-05-11" }, { "slug": "eyak", "name": "Eyak", "state": "Alaska", "lat": 60.5422, "lon": -145.7575, "magnetic_lat": 61.9, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 7.4, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-04-03" }, { "slug": "fairbanks", "name": "Fairbanks", "state": "Alaska", "lat": 64.8378, "lon": -147.7164, "magnetic_lat": 65.6, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 8.84, "clear_nights_per_year": 44.9, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "false-pass", "name": "False Pass", "state": "Alaska", "lat": 54.8481, "lon": -163.4106, "magnetic_lat": 53.7, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "sep", "oct" ], "peak_clear_nights": 0.04, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-01-01" }, { "slug": "fargo", "name": "Fargo", "state": "North Dakota", "lat": 46.8772, "lon": -96.7898, "magnetic_lat": 55.2, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.4, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "fayetteville", "name": "Fayetteville", "state": "Arkansas", "lat": 36.0726, "lon": -94.1574, "magnetic_lat": 44.7, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 10.7 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "flagstaff", "name": "Flagstaff", "state": "Arizona", "lat": 35.1983, "lon": -111.6513, "magnetic_lat": 42.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 4.8 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "fort-collins", "name": "Fort Collins", "state": "Colorado", "lat": 40.5853, "lon": -105.0844, "magnetic_lat": 48.3, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 18.6 }, "best_months": [ "nov", "mar", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "fort-worth", "name": "Fort Worth", "state": "Texas", "lat": 32.7555, "lon": -97.3308, "magnetic_lat": 41.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 3.3 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "fort-yukon", "name": "Fort Yukon", "state": "Alaska", "lat": 66.5681, "lon": -145.2731, "magnetic_lat": 67.6, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 13.9, "clear_nights_per_year": 68.7, "verdict": "regular", "last_threshold_date": "2026-04-01", "last_noticeable_date": "2026-03-30" }, { "slug": "fresno", "name": "Fresno", "state": "California", "lat": 36.7378, "lon": -119.7871, "magnetic_lat": 42.8, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 5.9 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "gakona", "name": "Gakona", "state": "Alaska", "lat": 62.3072, "lon": -145.3142, "magnetic_lat": 63.7, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 4.39, "clear_nights_per_year": 23.9, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "galena", "name": "Galena", "state": "Alaska", "lat": 64.7367, "lon": -156.9278, "magnetic_lat": 64.1, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 9.33, "clear_nights_per_year": 47, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "gambell", "name": "Gambell", "state": "Alaska", "lat": 63.7669, "lon": -171.7406, "magnetic_lat": 60.9, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "jan", "mar" ], "peak_clear_nights": 0.96, "clear_nights_per_year": 5.2, "verdict": "few_nights", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "girdwood", "name": "Girdwood", "state": "Alaska", "lat": 60.9422, "lon": -149.1672, "magnetic_lat": 61.8, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "jan" ], "peak_clear_nights": 1.22, "clear_nights_per_year": 7.3, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-25" }, { "slug": "glasgow", "name": "Glasgow", "state": "Montana", "lat": 48.1969, "lon": -106.6366, "magnetic_lat": 55.6, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "nov", "oct" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.1, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "goodnews-bay", "name": "Goodnews Bay", "state": "Alaska", "lat": 59.1164, "lon": -161.5922, "magnetic_lat": 58, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.53, "clear_nights_per_year": 3, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "grand-forks", "name": "Grand Forks", "state": "North Dakota", "lat": 47.9253, "lon": -97.0329, "magnetic_lat": 56.3, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.36, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "grand-marais", "name": "Grand Marais", "state": "Minnesota", "lat": 47.7504, "lon": -90.3343, "magnetic_lat": 56.6, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.28, "clear_nights_per_year": 1.7, "verdict": "few_nights", "last_threshold_date": "2026-03-14", "last_noticeable_date": "2026-01-21" }, { "slug": "grand-rapids", "name": "Grand Rapids", "state": "Michigan", "lat": 42.9634, "lon": -85.6681, "magnetic_lat": 52, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 43.9 }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "grayling", "name": "Grayling", "state": "Alaska", "lat": 62.8958, "lon": -160.0656, "magnetic_lat": 61.9, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.62, "clear_nights_per_year": 9.4, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "great-falls", "name": "Great Falls", "state": "Montana", "lat": 47.4941, "lon": -111.3008, "magnetic_lat": 54.4, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 58.2 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.1, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "green-bay", "name": "Green Bay", "state": "Wisconsin", "lat": 44.5133, "lon": -88.0133, "magnetic_lat": 53.5, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.16, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "gustavus", "name": "Gustavus", "state": "Alaska", "lat": 58.4139, "lon": -135.7367, "magnetic_lat": 61.5, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.08, "clear_nights_per_year": 6.9, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-18" }, { "slug": "haines", "name": "Haines", "state": "Alaska", "lat": 59.2336, "lon": -135.4461, "magnetic_lat": 62.4, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "jan", "mar" ], "peak_clear_nights": 3.56, "clear_nights_per_year": 20.2, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-08-29" }, { "slug": "halibut-cove", "name": "Halibut Cove", "state": "Alaska", "lat": 59.6, "lon": -151.2333, "magnetic_lat": 60.2, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 7.5, "verdict": "occasional", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-04-18" }, { "slug": "hartford", "name": "Hartford", "state": "Connecticut", "lat": 41.7658, "lon": -72.6734, "magnetic_lat": 51.1, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 26.4 }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.18, "clear_nights_per_year": 1, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "havre", "name": "Havre", "state": "Montana", "lat": 48.55, "lon": -109.6841, "magnetic_lat": 55.6, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.37, "clear_nights_per_year": 2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "healy", "name": "Healy", "state": "Alaska", "lat": 63.8631, "lon": -148.9686, "magnetic_lat": 64.5, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 8.54, "clear_nights_per_year": 45.1, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "helena", "name": "Helena", "state": "Montana", "lat": 46.5197, "lon": -112.0362, "magnetic_lat": 53.4, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "aug", "sep", "oct" ], "peak_clear_nights": 0.12, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "holy-cross", "name": "Holy Cross", "state": "Alaska", "lat": 62.1883, "lon": -159.775, "magnetic_lat": 61.2, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 1.61, "clear_nights_per_year": 9.7, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "homer", "name": "Homer", "state": "Alaska", "lat": 59.6428, "lon": -151.5481, "magnetic_lat": 60.1, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 7.5, "verdict": "occasional", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-04-18" }, { "slug": "hoonah", "name": "Hoonah", "state": "Alaska", "lat": 58.1106, "lon": -135.4458, "magnetic_lat": 61.3, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.1, "clear_nights_per_year": 6.9, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "hooper-bay", "name": "Hooper Bay", "state": "Alaska", "lat": 61.5208, "lon": -166.1231, "magnetic_lat": 59.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.34, "clear_nights_per_year": 1.7, "verdict": "few_nights", "last_threshold_date": "2026-04-02", "last_noticeable_date": "2026-03-22" }, { "slug": "houghton", "name": "Houghton", "state": "Michigan", "lat": 47.1211, "lon": -88.5694, "magnetic_lat": 56, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.23, "clear_nights_per_year": 1.1, "verdict": "few_nights", "last_threshold_date": "2026-03-14", "last_noticeable_date": "2026-01-21" }, { "slug": "houston", "name": "Houston", "state": "Texas", "lat": 29.7604, "lon": -95.3698, "magnetic_lat": 38.3, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "below_horizon", "elevation_deg": -0.1 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "hughes", "name": "Hughes", "state": "Alaska", "lat": 66.0428, "lon": -154.2644, "magnetic_lat": 65.7, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 10.02, "clear_nights_per_year": 49.7, "verdict": "regular", "last_threshold_date": "2026-04-04", "last_noticeable_date": "2026-04-03" }, { "slug": "huntsville", "name": "Huntsville", "state": "Alabama", "lat": 34.7304, "lon": -86.5861, "magnetic_lat": 43.8, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 8.1 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "huslia", "name": "Huslia", "state": "Alaska", "lat": 65.6981, "lon": -156.3972, "magnetic_lat": 65, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 9.81, "clear_nights_per_year": 48.4, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "hydaburg", "name": "Hydaburg", "state": "Alaska", "lat": 55.2064, "lon": -132.8269, "magnetic_lat": 58.9, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.47, "clear_nights_per_year": 2.6, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "idaho-falls", "name": "Idaho Falls", "state": "Idaho", "lat": 43.4643, "lon": -112.0362, "magnetic_lat": 50.3, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 54.1 }, "best_months": [ "nov", "may", "aug" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "igiugig", "name": "Igiugig", "state": "Alaska", "lat": 59.3242, "lon": -155.9031, "magnetic_lat": 59.1, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.62, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "iliamna", "name": "Iliamna", "state": "Alaska", "lat": 59.7544, "lon": -154.9117, "magnetic_lat": 59.7, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.63, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "indianapolis", "name": "Indianapolis", "state": "Indiana", "lat": 39.7684, "lon": -86.1581, "magnetic_lat": 48.8, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 22.9 }, "best_months": [ "oct", "nov", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "international-falls", "name": "International Falls", "state": "Minnesota", "lat": 48.6009, "lon": -93.4109, "magnetic_lat": 57.2, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "sep", "aug" ], "peak_clear_nights": 0.68, "clear_nights_per_year": 5, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-14" }, { "slug": "jackson", "name": "Jackson", "state": "Wyoming", "lat": 43.4799, "lon": -110.7624, "magnetic_lat": 50.5, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 62.7 }, "best_months": [ "nov", "aug", "mar" ], "peak_clear_nights": 0.05, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "jackson-ms", "name": "Jackson", "state": "Mississippi", "lat": 32.2988, "lon": -90.1848, "magnetic_lat": 41.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 3.3 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "jacksonville", "name": "Jacksonville", "state": "Florida", "lat": 30.3322, "lon": -81.6557, "magnetic_lat": 39.6, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 1.2 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "juneau", "name": "Juneau", "state": "Alaska", "lat": 58.3019, "lon": -134.4197, "magnetic_lat": 61.6, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.1, "clear_nights_per_year": 6.9, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "kake", "name": "Kake", "state": "Alaska", "lat": 56.9697, "lon": -133.9469, "magnetic_lat": 60.4, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.16, "clear_nights_per_year": 7.3, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "kaktovik", "name": "Kaktovik", "state": "Alaska", "lat": 70.1331, "lon": -143.6231, "magnetic_lat": 71.1, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "feb", "dec" ], "peak_clear_nights": 10.33, "clear_nights_per_year": 40.9, "verdict": "regular", "last_threshold_date": "2026-03-23", "last_noticeable_date": "2026-03-23" }, { "slug": "kalispell", "name": "Kalispell", "state": "Montana", "lat": 48.1958, "lon": -114.3129, "magnetic_lat": 54.7, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 72.8 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.36, "clear_nights_per_year": 1.7, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "kalskag", "name": "Kalskag", "state": "Alaska", "lat": 61.5364, "lon": -160.3414, "magnetic_lat": 60.5, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.56, "clear_nights_per_year": 9.6, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "kaltag", "name": "Kaltag", "state": "Alaska", "lat": 64.3169, "lon": -158.7236, "magnetic_lat": 63.4, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 4.82, "clear_nights_per_year": 26.3, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "kansas-city", "name": "Kansas City", "state": "Missouri", "lat": 39.0997, "lon": -94.5786, "magnetic_lat": 47.7, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "karluk", "name": "Karluk", "state": "Alaska", "lat": 57.5667, "lon": -154.45, "magnetic_lat": 57.7, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "oct", "mar" ], "peak_clear_nights": 0.5, "clear_nights_per_year": 2.4, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "kasaan", "name": "Kasaan", "state": "Alaska", "lat": 55.5417, "lon": -132.4019, "magnetic_lat": 59.3, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.47, "clear_nights_per_year": 2.6, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "kasigluk", "name": "Kasigluk", "state": "Alaska", "lat": 60.8736, "lon": -162.525, "magnetic_lat": 59.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.47, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "kenai", "name": "Kenai", "state": "Alaska", "lat": 60.5544, "lon": -151.2583, "magnetic_lat": 61.1, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 1.15, "clear_nights_per_year": 7.4, "verdict": "occasional", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-04-18" }, { "slug": "ketchikan", "name": "Ketchikan", "state": "Alaska", "lat": 55.3422, "lon": -131.6461, "magnetic_lat": 59.2, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.46, "clear_nights_per_year": 2.7, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "kiana", "name": "Kiana", "state": "Alaska", "lat": 66.9761, "lon": -160.4258, "magnetic_lat": 65.6, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "dec", "mar" ], "peak_clear_nights": 8.27, "clear_nights_per_year": 39.8, "verdict": "regular", "last_threshold_date": "2026-03-30", "last_noticeable_date": "2026-03-25" }, { "slug": "king-cove", "name": "King Cove", "state": "Alaska", "lat": 55.0597, "lon": -162.3269, "magnetic_lat": 54, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 43.9 }, "best_months": [ "mar", "nov", "sep" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "king-salmon", "name": "King Salmon", "state": "Alaska", "lat": 58.6881, "lon": -156.6531, "magnetic_lat": 58.4, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.55, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "kipnuk", "name": "Kipnuk", "state": "Alaska", "lat": 59.9328, "lon": -164.0314, "magnetic_lat": 58.4, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.29, "clear_nights_per_year": 1.7, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "kivalina", "name": "Kivalina", "state": "Alaska", "lat": 67.7286, "lon": -164.5431, "magnetic_lat": 65.7, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 7.83, "clear_nights_per_year": 37.2, "verdict": "regular", "last_threshold_date": "2026-03-30", "last_noticeable_date": "2026-03-25" }, { "slug": "klawock", "name": "Klawock", "state": "Alaska", "lat": 55.5531, "lon": -133.0978, "magnetic_lat": 59.2, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.47, "clear_nights_per_year": 2.6, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "kobuk", "name": "Kobuk", "state": "Alaska", "lat": 66.9069, "lon": -156.8969, "magnetic_lat": 66.1, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 14.18, "clear_nights_per_year": 70.3, "verdict": "regular", "last_threshold_date": "2026-04-02", "last_noticeable_date": "2026-04-02" }, { "slug": "kodiak", "name": "Kodiak", "state": "Alaska", "lat": 57.79, "lon": -152.4072, "magnetic_lat": 58.2, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "oct", "mar" ], "peak_clear_nights": 0.63, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "kokhanok", "name": "Kokhanok", "state": "Alaska", "lat": 59.4333, "lon": -154.8, "magnetic_lat": 59.4, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.63, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "koliganek", "name": "Koliganek", "state": "Alaska", "lat": 59.7283, "lon": -157.2608, "magnetic_lat": 59.3, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.67, "clear_nights_per_year": 3.3, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "kotlik", "name": "Kotlik", "state": "Alaska", "lat": 63.0306, "lon": -163.5331, "magnetic_lat": 61.4, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 1.18, "clear_nights_per_year": 6.8, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "kotzebue", "name": "Kotzebue", "state": "Alaska", "lat": 66.8958, "lon": -162.5981, "magnetic_lat": 65.2, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 7.34, "clear_nights_per_year": 35.6, "verdict": "regular", "last_threshold_date": "2026-03-30", "last_noticeable_date": "2026-03-25" }, { "slug": "koyuk", "name": "Koyuk", "state": "Alaska", "lat": 64.9369, "lon": -161.1542, "magnetic_lat": 63.6, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 4.45, "clear_nights_per_year": 23.7, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "koyukuk", "name": "Koyukuk", "state": "Alaska", "lat": 64.8756, "lon": -157.7272, "magnetic_lat": 64.1, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 9.33, "clear_nights_per_year": 46.9, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "kwethluk", "name": "Kwethluk", "state": "Alaska", "lat": 60.7903, "lon": -161.4436, "magnetic_lat": 59.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 0.52, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "kwigillingok", "name": "Kwigillingok", "state": "Alaska", "lat": 59.8764, "lon": -163.1686, "magnetic_lat": 58.5, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.35, "clear_nights_per_year": 2, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "lake-minchumina", "name": "Lake Minchumina", "state": "Alaska", "lat": 63.8858, "lon": -152.3044, "magnetic_lat": 64, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 8.08, "clear_nights_per_year": 42.1, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "lake-placid", "name": "Lake Placid", "state": "New York", "lat": 44.2795, "lon": -73.9799, "magnetic_lat": 53.6, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "larsen-bay", "name": "Larsen Bay", "state": "Alaska", "lat": 57.5339, "lon": -153.9756, "magnetic_lat": 57.7, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "oct", "mar" ], "peak_clear_nights": 0.62, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "las-vegas", "name": "Las Vegas", "state": "Nevada", "lat": 36.1699, "lon": -115.1398, "magnetic_lat": 42.8, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 5.9 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "levelock", "name": "Levelock", "state": "Alaska", "lat": 59.1133, "lon": -156.8589, "magnetic_lat": 58.8, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.67, "clear_nights_per_year": 3.3, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "lexington", "name": "Lexington", "state": "Kentucky", "lat": 38.0406, "lon": -84.5037, "magnetic_lat": 47.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 27.7 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "lime-village", "name": "Lime Village", "state": "Alaska", "lat": 61.3569, "lon": -155.4406, "magnetic_lat": 61.1, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "nov" ], "peak_clear_nights": 1.48, "clear_nights_per_year": 8.8, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-25" }, { "slug": "lincoln", "name": "Lincoln", "state": "Nebraska", "lat": 40.8136, "lon": -96.7026, "magnetic_lat": 49.2, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 27.7 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.08, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "little-rock", "name": "Little Rock", "state": "Arkansas", "lat": 34.7465, "lon": -92.2896, "magnetic_lat": 43.5, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 7.4 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "livengood", "name": "Livengood", "state": "Alaska", "lat": 65.5344, "lon": -148.5417, "magnetic_lat": 66.1, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 13.69, "clear_nights_per_year": 68.2, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "long-beach", "name": "Long Beach", "state": "California", "lat": 33.7701, "lon": -118.1937, "magnetic_lat": 40, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 1.7 }, "best_months": [ "oct", "may", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "los-angeles", "name": "Los Angeles", "state": "California", "lat": 34.0522, "lon": -118.2437, "magnetic_lat": 40.3, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 2.1 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "louisville", "name": "Louisville", "state": "Kentucky", "lat": 38.2527, "lon": -85.7585, "magnetic_lat": 47.3, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 29.1 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "lower-kalskag", "name": "Lower Kalskag", "state": "Alaska", "lat": 61.5081, "lon": -160.3464, "magnetic_lat": 60.5, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.56, "clear_nights_per_year": 9.6, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "mackinaw-city", "name": "Mackinaw City", "state": "Michigan", "lat": 45.7781, "lon": -84.7272, "magnetic_lat": 54.9, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 84.1 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.26, "clear_nights_per_year": 1.6, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "madison", "name": "Madison", "state": "Wisconsin", "lat": 43.0731, "lon": -89.4012, "magnetic_lat": 52, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 43.9 }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.16, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "manley-hot-springs", "name": "Manley Hot Springs", "state": "Alaska", "lat": 64.9986, "lon": -150.6436, "magnetic_lat": 65.3, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 8.8, "clear_nights_per_year": 44.8, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "manokotak", "name": "Manokotak", "state": "Alaska", "lat": 58.9881, "lon": -159.0544, "magnetic_lat": 58.3, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.45, "clear_nights_per_year": 2.5, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "marquette", "name": "Marquette", "state": "Michigan", "lat": 46.5436, "lon": -87.3954, "magnetic_lat": 55.5, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.23, "clear_nights_per_year": 1.4, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "marshall", "name": "Marshall", "state": "Alaska", "lat": 61.8644, "lon": -162.0261, "magnetic_lat": 60.6, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.58, "clear_nights_per_year": 9.4, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "mcgrath", "name": "McGrath", "state": "Alaska", "lat": 62.9572, "lon": -155.6069, "magnetic_lat": 62.6, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 4.08, "clear_nights_per_year": 22.2, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "medford", "name": "Medford", "state": "Oregon", "lat": 42.3265, "lon": -122.8756, "magnetic_lat": 47.8, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 38.7 }, "best_months": [ "oct", "may", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "mekoryuk", "name": "Mekoryuk", "state": "Alaska", "lat": 60.3914, "lon": -166.2711, "magnetic_lat": 58.5, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 0.32, "clear_nights_per_year": 1.7, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "memphis", "name": "Memphis", "state": "Tennessee", "lat": 35.1495, "lon": -90.049, "magnetic_lat": 44, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 8.6 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "mesa", "name": "Mesa", "state": "Arizona", "lat": 33.4152, "lon": -111.8315, "magnetic_lat": 40.4, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 2.2 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "metlakatla", "name": "Metlakatla", "state": "Alaska", "lat": 55.1308, "lon": -131.5758, "magnetic_lat": 59, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.46, "clear_nights_per_year": 2.7, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "miami", "name": "Miami", "state": "Florida", "lat": 25.7617, "lon": -80.1918, "magnetic_lat": 35, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "below_horizon", "elevation_deg": -3 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "millinocket", "name": "Millinocket", "state": "Maine", "lat": 45.6573, "lon": -68.7098, "magnetic_lat": 55, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.37, "clear_nights_per_year": 2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "milwaukee", "name": "Milwaukee", "state": "Wisconsin", "lat": 43.0389, "lon": -87.9065, "magnetic_lat": 52, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 43.9 }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.6, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "minneapolis", "name": "Minneapolis", "state": "Minnesota", "lat": 44.9778, "lon": -93.265, "magnetic_lat": 53.6, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.19, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "minot", "name": "Minot", "state": "North Dakota", "lat": 48.233, "lon": -101.2957, "magnetic_lat": 56.2, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.37, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "minto", "name": "Minto", "state": "Alaska", "lat": 65.1417, "lon": -149.3708, "magnetic_lat": 65.6, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 9.04, "clear_nights_per_year": 46.7, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "missoula", "name": "Missoula", "state": "Montana", "lat": 46.8721, "lon": -113.994, "magnetic_lat": 53.5, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "aug", "sep", "oct" ], "peak_clear_nights": 0.12, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "morgantown", "name": "Morgantown", "state": "West Virginia", "lat": 39.6295, "lon": -79.9559, "magnetic_lat": 48.9, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 24 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "mountain-village", "name": "Mountain Village", "state": "Alaska", "lat": 62.0956, "lon": -163.7192, "magnetic_lat": 60.5, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.55, "clear_nights_per_year": 8.7, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "naknek", "name": "Naknek", "state": "Alaska", "lat": 58.7325, "lon": -157.0131, "magnetic_lat": 58.4, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.55, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "napakiak", "name": "Napakiak", "state": "Alaska", "lat": 60.6956, "lon": -161.9792, "magnetic_lat": 59.5, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 0.52, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "napaskiak", "name": "Napaskiak", "state": "Alaska", "lat": 60.7075, "lon": -161.7769, "magnetic_lat": 59.5, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 0.52, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "nashville", "name": "Nashville", "state": "Tennessee", "lat": 36.1627, "lon": -86.7816, "magnetic_lat": 45.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 12.6 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "nelson-lagoon", "name": "Nelson Lagoon", "state": "Alaska", "lat": 56.0072, "lon": -161.2092, "magnetic_lat": 55.1, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "sep", "nov" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "nenana", "name": "Nenana", "state": "Alaska", "lat": 64.5653, "lon": -149.0944, "magnetic_lat": 65.2, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 8.72, "clear_nights_per_year": 45, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "new-haven", "name": "New Haven", "state": "Connecticut", "lat": 41.3083, "lon": -72.9279, "magnetic_lat": 50.7, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 72.8 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "new-orleans", "name": "New Orleans", "state": "Louisiana", "lat": 29.9511, "lon": -90.0715, "magnetic_lat": 38.8, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 0.4 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "new-stuyahok", "name": "New Stuyahok", "state": "Alaska", "lat": 59.4506, "lon": -157.3153, "magnetic_lat": 59, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.67, "clear_nights_per_year": 3.3, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "new-york", "name": "New York", "state": "New York", "lat": 40.7128, "lon": -74.006, "magnetic_lat": 50.1, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 47 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "newark", "name": "Newark", "state": "New Jersey", "lat": 40.7357, "lon": -74.1724, "magnetic_lat": 50.1, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 47 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "newhalen", "name": "Newhalen", "state": "Alaska", "lat": 59.7208, "lon": -154.8981, "magnetic_lat": 59.7, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.63, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "newport-vt", "name": "Newport", "state": "Vermont", "lat": 44.9364, "lon": -72.2051, "magnetic_lat": 54.3, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 54.1 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.35, "clear_nights_per_year": 1.8, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "nightmute", "name": "Nightmute", "state": "Alaska", "lat": 60.4711, "lon": -164.6972, "magnetic_lat": 58.8, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "nikolai", "name": "Nikolai", "state": "Alaska", "lat": 63.0139, "lon": -154.3581, "magnetic_lat": 62.9, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 4.54, "clear_nights_per_year": 24.8, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "nikolski", "name": "Nikolski", "state": "Alaska", "lat": 52.9422, "lon": -168.8686, "magnetic_lat": 51, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 25.1 }, "best_months": [ "nov", "oct", "sep" ], "peak_clear_nights": 0.04, "clear_nights_per_year": 0.1, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-01-01" }, { "slug": "ninilchik", "name": "Ninilchik", "state": "Alaska", "lat": 60.0497, "lon": -151.6672, "magnetic_lat": 60.5, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 1.18, "clear_nights_per_year": 7.5, "verdict": "occasional", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-04-18" }, { "slug": "noatak", "name": "Noatak", "state": "Alaska", "lat": 67.5667, "lon": -162.9756, "magnetic_lat": 65.7, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "dec", "mar" ], "peak_clear_nights": 10.09, "clear_nights_per_year": 49, "verdict": "regular", "last_threshold_date": "2026-03-30", "last_noticeable_date": "2026-03-25" }, { "slug": "nome", "name": "Nome", "state": "Alaska", "lat": 64.5011, "lon": -165.4064, "magnetic_lat": 62.5, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 3.82, "clear_nights_per_year": 22.1, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "nondalton", "name": "Nondalton", "state": "Alaska", "lat": 60.0075, "lon": -154.8389, "magnetic_lat": 60, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "jan" ], "peak_clear_nights": 1.62, "clear_nights_per_year": 9.1, "verdict": "occasional", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-04-18" }, { "slug": "noorvik", "name": "Noorvik", "state": "Alaska", "lat": 66.8258, "lon": -161.0422, "magnetic_lat": 65.4, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "dec", "mar" ], "peak_clear_nights": 8.25, "clear_nights_per_year": 40, "verdict": "regular", "last_threshold_date": "2026-04-02", "last_noticeable_date": "2026-04-02" }, { "slug": "north-pole", "name": "North Pole", "state": "Alaska", "lat": 64.7514, "lon": -147.3494, "magnetic_lat": 65.6, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 8.84, "clear_nights_per_year": 45, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "northway", "name": "Northway", "state": "Alaska", "lat": 62.9622, "lon": -141.9392, "magnetic_lat": 64.8, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 7.99, "clear_nights_per_year": 42, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "nuiqsut", "name": "Nuiqsut", "state": "Alaska", "lat": 70.2106, "lon": -151.0056, "magnetic_lat": 70, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "dec", "feb" ], "peak_clear_nights": 11.54, "clear_nights_per_year": 45.6, "verdict": "regular", "last_threshold_date": "2026-03-24", "last_noticeable_date": "2026-03-24" }, { "slug": "nulato", "name": "Nulato", "state": "Alaska", "lat": 64.7292, "lon": -158.0958, "magnetic_lat": 63.9, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 4.92, "clear_nights_per_year": 26.2, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "nunam-iqua", "name": "Nunam Iqua", "state": "Alaska", "lat": 62.5403, "lon": -164.8611, "magnetic_lat": 60.8, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 6.8, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "nunapitchuk", "name": "Nunapitchuk", "state": "Alaska", "lat": 60.9056, "lon": -162.4444, "magnetic_lat": 59.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.47, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "oakland", "name": "Oakland", "state": "California", "lat": 37.8044, "lon": -122.2712, "magnetic_lat": 43.5, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 7.4 }, "best_months": [ "oct", "may", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "oklahoma-city", "name": "Oklahoma City", "state": "Oklahoma", "lat": 35.4676, "lon": -97.5164, "magnetic_lat": 43.8, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 8.1 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "old-harbor", "name": "Old Harbor", "state": "Alaska", "lat": 57.2181, "lon": -153.3006, "magnetic_lat": 57.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "oct", "mar" ], "peak_clear_nights": 0.62, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "omaha", "name": "Omaha", "state": "Nebraska", "lat": 41.2565, "lon": -95.9345, "magnetic_lat": 49.7, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.08, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "omak", "name": "Omak", "state": "Washington", "lat": 48.411, "lon": -119.5276, "magnetic_lat": 54.3, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 54.1 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.43, "clear_nights_per_year": 2.1, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "ouzinkie", "name": "Ouzinkie", "state": "Alaska", "lat": 57.9231, "lon": -152.5006, "magnetic_lat": 58.4, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "oct", "mar" ], "peak_clear_nights": 0.63, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "palmer", "name": "Palmer", "state": "Alaska", "lat": 61.5997, "lon": -149.1131, "magnetic_lat": 62.4, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "nov" ], "peak_clear_nights": 3.63, "clear_nights_per_year": 20.9, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "park-city", "name": "Park City", "state": "Utah", "lat": 40.6461, "lon": -111.498, "magnetic_lat": 47.6, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 34.3 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "pelican", "name": "Pelican", "state": "Alaska", "lat": 57.9556, "lon": -136.2286, "magnetic_lat": 61, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "sep", "feb" ], "peak_clear_nights": 0.81, "clear_nights_per_year": 4.7, "verdict": "few_nights", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "petersburg", "name": "Petersburg", "state": "Alaska", "lat": 56.8125, "lon": -132.9453, "magnetic_lat": 60.4, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 7.3, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "philadelphia", "name": "Philadelphia", "state": "Pennsylvania", "lat": 39.9526, "lon": -75.1652, "magnetic_lat": 49.3, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 29.1 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.08, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "phoenix", "name": "Phoenix", "state": "Arizona", "lat": 33.4484, "lon": -112.074, "magnetic_lat": 40.4, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 2.2 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "pilot-point", "name": "Pilot Point", "state": "Alaska", "lat": 57.5736, "lon": -157.5714, "magnetic_lat": 57.2, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.46, "clear_nights_per_year": 2.3, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "pilot-station", "name": "Pilot Station", "state": "Alaska", "lat": 61.9336, "lon": -162.8794, "magnetic_lat": 60.5, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.57, "clear_nights_per_year": 9.3, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "pitkas-point", "name": "Pitkas Point", "state": "Alaska", "lat": 62.0319, "lon": -163.2928, "magnetic_lat": 60.5, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.57, "clear_nights_per_year": 8.8, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "pittsburg-nh", "name": "Pittsburg", "state": "New Hampshire", "lat": 45.0526, "lon": -71.3939, "magnetic_lat": 54.4, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 58.2 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.35, "clear_nights_per_year": 1.9, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "pittsburgh", "name": "Pittsburgh", "state": "Pennsylvania", "lat": 40.4406, "lon": -79.9959, "magnetic_lat": 49.7, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "platinum", "name": "Platinum", "state": "Alaska", "lat": 59.0167, "lon": -161.8167, "magnetic_lat": 57.9, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.53, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "plattsburgh", "name": "Plattsburgh", "state": "New York", "lat": 44.6995, "lon": -73.4529, "magnetic_lat": 54, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 43.9 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.36, "clear_nights_per_year": 1.9, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "point-hope", "name": "Point Hope", "state": "Alaska", "lat": 68.3486, "lon": -166.7997, "magnetic_lat": 65.9, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "feb", "mar" ], "peak_clear_nights": 7.33, "clear_nights_per_year": 29.7, "verdict": "regular", "last_threshold_date": "2026-03-28", "last_noticeable_date": "2026-03-25" }, { "slug": "point-lay", "name": "Point Lay", "state": "Alaska", "lat": 69.7328, "lon": -163.0056, "magnetic_lat": 67.7, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "dec", "feb" ], "peak_clear_nights": 11.87, "clear_nights_per_year": 48.5, "verdict": "regular", "last_threshold_date": "2026-03-25", "last_noticeable_date": "2026-03-25" }, { "slug": "port-alexander", "name": "Port Alexander", "state": "Alaska", "lat": 56.2464, "lon": -134.6486, "magnetic_lat": 59.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.41, "clear_nights_per_year": 2.3, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "port-angeles", "name": "Port Angeles", "state": "Washington", "lat": 48.1181, "lon": -123.4307, "magnetic_lat": 53.4, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "aug", "sep", "oct" ], "peak_clear_nights": 0.12, "clear_nights_per_year": 0.5, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "port-heiden", "name": "Port Heiden", "state": "Alaska", "lat": 56.9556, "lon": -158.6278, "magnetic_lat": 56.4, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "sep" ], "peak_clear_nights": 0.2, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "port-lions", "name": "Port Lions", "state": "Alaska", "lat": 57.8856, "lon": -152.8889, "magnetic_lat": 58.3, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "oct", "mar" ], "peak_clear_nights": 0.63, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "portage-creek", "name": "Portage Creek", "state": "Alaska", "lat": 68.5833, "lon": -159.0417, "magnetic_lat": 67.3, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "dec", "mar" ], "peak_clear_nights": 13.82, "clear_nights_per_year": 63.8, "verdict": "regular", "last_threshold_date": "2026-03-28", "last_noticeable_date": "2026-03-28" }, { "slug": "portland", "name": "Portland", "state": "Oregon", "lat": 45.5152, "lon": -122.6784, "magnetic_lat": 51, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 25.1 }, "best_months": [ "aug", "sep", "oct" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "portland-me", "name": "Portland", "state": "Maine", "lat": 43.6591, "lon": -70.2568, "magnetic_lat": 53, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.17, "clear_nights_per_year": 0.9, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "presque-isle", "name": "Presque Isle", "state": "Maine", "lat": 46.6812, "lon": -68.0159, "magnetic_lat": 56, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.36, "clear_nights_per_year": 2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "providence", "name": "Providence", "state": "Rhode Island", "lat": 41.824, "lon": -71.4128, "magnetic_lat": 51.2, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 27.7 }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.17, "clear_nights_per_year": 0.9, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "quinhagak", "name": "Quinhagak", "state": "Alaska", "lat": 59.7556, "lon": -161.8456, "magnetic_lat": 58.6, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.52, "clear_nights_per_year": 2.9, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "raleigh", "name": "Raleigh", "state": "North Carolina", "lat": 35.7796, "lon": -78.6382, "magnetic_lat": 45.1, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 12.2 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "rampart", "name": "Rampart", "state": "Alaska", "lat": 65.5083, "lon": -150.1417, "magnetic_lat": 65.9, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 9.29, "clear_nights_per_year": 47.4, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "rangeley", "name": "Rangeley", "state": "Maine", "lat": 44.9648, "lon": -70.6437, "magnetic_lat": 54.3, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 54.1 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.39, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "rapid-city", "name": "Rapid City", "state": "South Dakota", "lat": 44.0805, "lon": -103.231, "magnetic_lat": 51.9, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 41.2 }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "red-devil", "name": "Red Devil", "state": "Alaska", "lat": 61.7881, "lon": -157.3497, "magnetic_lat": 61.2, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.57, "clear_nights_per_year": 9, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "redding", "name": "Redding", "state": "California", "lat": 40.5865, "lon": -122.3917, "magnetic_lat": 46.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 17.9 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "reno", "name": "Reno", "state": "Nevada", "lat": 39.5296, "lon": -119.8138, "magnetic_lat": 45.5, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 13.9 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "richmond", "name": "Richmond", "state": "Virginia", "lat": 37.5407, "lon": -77.436, "magnetic_lat": 46.9, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 24 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "rochester-mn", "name": "Rochester", "state": "Minnesota", "lat": 44.0121, "lon": -92.4802, "magnetic_lat": 52.7, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 72.8 }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.18, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "rochester-ny", "name": "Rochester", "state": "New York", "lat": 43.1566, "lon": -77.6088, "magnetic_lat": 52.5, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 62.7 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.1, "clear_nights_per_year": 0.5, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "ruby", "name": "Ruby", "state": "Alaska", "lat": 64.7392, "lon": -155.4856, "magnetic_lat": 64.3, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 9.32, "clear_nights_per_year": 47, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "russian-mission", "name": "Russian Mission", "state": "Alaska", "lat": 61.7753, "lon": -161.3192, "magnetic_lat": 60.6, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.54, "clear_nights_per_year": 9.5, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "sacramento", "name": "Sacramento", "state": "California", "lat": 38.5816, "lon": -121.4944, "magnetic_lat": 44.3, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 9.4 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "saint-george", "name": "Saint George", "state": "Alaska", "lat": 56.5972, "lon": -169.5472, "magnetic_lat": 54.4, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 58.2 }, "best_months": [ "nov", "oct", "mar" ], "peak_clear_nights": 0.1, "clear_nights_per_year": 0.4, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "saint-marys", "name": "Saint Mary's", "state": "Alaska", "lat": 62.0556, "lon": -163.1692, "magnetic_lat": 60.6, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.55, "clear_nights_per_year": 8.8, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "saint-michael", "name": "Saint Michael", "state": "Alaska", "lat": 63.4786, "lon": -162.0378, "magnetic_lat": 62.1, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 3.13, "clear_nights_per_year": 17.3, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "saint-paul", "name": "Saint Paul", "state": "Alaska", "lat": 57.1222, "lon": -170.2769, "magnetic_lat": 54.8, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 78.4 }, "best_months": [ "nov", "sep", "oct" ], "peak_clear_nights": 0.09, "clear_nights_per_year": 0.4, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "salt-lake-city", "name": "Salt Lake City", "state": "Utah", "lat": 40.7608, "lon": -111.891, "magnetic_lat": 47.7, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "san-antonio", "name": "San Antonio", "state": "Texas", "lat": 29.4241, "lon": -98.4936, "magnetic_lat": 37.7, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "below_horizon", "elevation_deg": -0.7 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "san-diego", "name": "San Diego", "state": "California", "lat": 32.7157, "lon": -117.1611, "magnetic_lat": 39.1, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 0.7 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "san-francisco", "name": "San Francisco", "state": "California", "lat": 37.7749, "lon": -122.4194, "magnetic_lat": 43.4, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 7.1 }, "best_months": [ "oct", "may", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "san-jose", "name": "San Jose", "state": "California", "lat": 37.3382, "lon": -121.8863, "magnetic_lat": 43.1, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 6.5 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "sand-point", "name": "Sand Point", "state": "Alaska", "lat": 55.3369, "lon": -160.5006, "magnetic_lat": 54.6, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 67.6 }, "best_months": [ "nov", "sep", "mar" ], "peak_clear_nights": 0.18, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-03-22", "last_noticeable_date": "2026-01-21" }, { "slug": "sandpoint", "name": "Sandpoint", "state": "Idaho", "lat": 48.2766, "lon": -116.5535, "magnetic_lat": 54.5, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 62.7 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.39, "clear_nights_per_year": 1.8, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "santa-fe", "name": "Santa Fe", "state": "New Mexico", "lat": 35.687, "lon": -105.9378, "magnetic_lat": 43.3, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 6.9 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "sault-ste-marie", "name": "Sault Ste. Marie", "state": "Michigan", "lat": 46.4953, "lon": -84.3453, "magnetic_lat": 55.6, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.22, "clear_nights_per_year": 1.5, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-07-04" }, { "slug": "savoonga", "name": "Savoonga", "state": "Alaska", "lat": 63.6869, "lon": -170.4931, "magnetic_lat": 61, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "jan", "mar" ], "peak_clear_nights": 0.96, "clear_nights_per_year": 5.2, "verdict": "few_nights", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "saxman", "name": "Saxman", "state": "Alaska", "lat": 55.3156, "lon": -131.6122, "magnetic_lat": 59.2, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.46, "clear_nights_per_year": 2.7, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "scammon-bay", "name": "Scammon Bay", "state": "Alaska", "lat": 61.8453, "lon": -165.5789, "magnetic_lat": 60, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 1.41, "clear_nights_per_year": 8.1, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "scranton", "name": "Scranton", "state": "Pennsylvania", "lat": 41.409, "lon": -75.6624, "magnetic_lat": 50.7, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 72.8 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "seattle", "name": "Seattle", "state": "Washington", "lat": 47.6062, "lon": -122.3321, "magnetic_lat": 53.1, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "aug", "sep", "oct" ], "peak_clear_nights": 0.12, "clear_nights_per_year": 0.6, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "selawik", "name": "Selawik", "state": "Alaska", "lat": 66.6006, "lon": -159.9869, "magnetic_lat": 65.3, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 10.02, "clear_nights_per_year": 47.9, "verdict": "regular", "last_threshold_date": "2026-04-02", "last_noticeable_date": "2026-04-02" }, { "slug": "seldovia", "name": "Seldovia", "state": "Alaska", "lat": 59.4375, "lon": -151.7142, "magnetic_lat": 59.9, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "oct", "mar" ], "peak_clear_nights": 0.52, "clear_nights_per_year": 2.5, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "seward", "name": "Seward", "state": "Alaska", "lat": 60.1042, "lon": -149.4422, "magnetic_lat": 60.9, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "jan" ], "peak_clear_nights": 1.22, "clear_nights_per_year": 7.4, "verdict": "occasional", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-04-18" }, { "slug": "shageluk", "name": "Shageluk", "state": "Alaska", "lat": 62.6922, "lon": -159.5692, "magnetic_lat": 61.7, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 1.62, "clear_nights_per_year": 9.6, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "shaktoolik", "name": "Shaktoolik", "state": "Alaska", "lat": 64.3711, "lon": -161.2236, "magnetic_lat": 63.1, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 4.4, "clear_nights_per_year": 23.9, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "sheldon-point", "name": "Sheldon Point", "state": "Alaska", "lat": 62.5208, "lon": -164.8406, "magnetic_lat": 60.8, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 6.8, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "sheridan", "name": "Sheridan", "state": "Wyoming", "lat": 44.7972, "lon": -106.9562, "magnetic_lat": 52.2, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 50.4 }, "best_months": [ "nov", "oct", "sep" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "shishmaref", "name": "Shishmaref", "state": "Alaska", "lat": 66.2569, "lon": -166.0583, "magnetic_lat": 64.1, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 7.04, "clear_nights_per_year": 30.5, "verdict": "regular", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-04-03" }, { "slug": "shungnak", "name": "Shungnak", "state": "Alaska", "lat": 66.8881, "lon": -157.1625, "magnetic_lat": 66, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 14.2, "clear_nights_per_year": 70.3, "verdict": "regular", "last_threshold_date": "2026-04-02", "last_noticeable_date": "2026-04-02" }, { "slug": "sioux-falls", "name": "Sioux Falls", "state": "South Dakota", "lat": 43.546, "lon": -96.7313, "magnetic_lat": 51.9, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 41.2 }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.19, "clear_nights_per_year": 0.9, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "sitka", "name": "Sitka", "state": "Alaska", "lat": 57.0531, "lon": -135.33, "magnetic_lat": 60.3, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.16, "clear_nights_per_year": 7.4, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "skagway", "name": "Skagway", "state": "Alaska", "lat": 59.4606, "lon": -135.3158, "magnetic_lat": 62.6, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "jan", "mar" ], "peak_clear_nights": 3.56, "clear_nights_per_year": 20.1, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-08-29" }, { "slug": "slana", "name": "Slana", "state": "Alaska", "lat": 62.7075, "lon": -143.9519, "magnetic_lat": 64.3, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 7.45, "clear_nights_per_year": 42.2, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "sleetmute", "name": "Sleetmute", "state": "Alaska", "lat": 61.7006, "lon": -157.1694, "magnetic_lat": 61.2, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.57, "clear_nights_per_year": 9, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "soldotna", "name": "Soldotna", "state": "Alaska", "lat": 60.4897, "lon": -151.0583, "magnetic_lat": 61, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 1.16, "clear_nights_per_year": 7.4, "verdict": "occasional", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-04-18" }, { "slug": "south-naknek", "name": "South Naknek", "state": "Alaska", "lat": 58.7056, "lon": -157.0069, "magnetic_lat": 58.4, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.55, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "spokane", "name": "Spokane", "state": "Washington", "lat": 47.6597, "lon": -117.4291, "magnetic_lat": 53.8, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "aug", "oct", "sep" ], "peak_clear_nights": 0.13, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "st-cloud", "name": "St. Cloud", "state": "Minnesota", "lat": 45.5579, "lon": -94.1632, "magnetic_lat": 54.1, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "northern_horizon", "elevation_deg": 47 }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.5, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "st-johnsbury", "name": "St. Johnsbury", "state": "Vermont", "lat": 44.4192, "lon": -72.0151, "magnetic_lat": 53.8, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "apr" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "st-louis", "name": "St. Louis", "state": "Missouri", "lat": 38.627, "lon": -90.1994, "magnetic_lat": 47.5, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 32.4 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "stebbins", "name": "Stebbins", "state": "Alaska", "lat": 63.5158, "lon": -162.2781, "magnetic_lat": 62.1, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 3.12, "clear_nights_per_year": 17.2, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "stevens-village", "name": "Stevens Village", "state": "Alaska", "lat": 66.0175, "lon": -149.0789, "magnetic_lat": 66.5, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 13.77, "clear_nights_per_year": 69.3, "verdict": "regular", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-04-03" }, { "slug": "stony-river", "name": "Stony River", "state": "Alaska", "lat": 61.7892, "lon": -156.5894, "magnetic_lat": 61.4, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "nov" ], "peak_clear_nights": 1.55, "clear_nights_per_year": 9, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "sturgeon-bay", "name": "Sturgeon Bay", "state": "Wisconsin", "lat": 44.8342, "lon": -87.377, "magnetic_lat": 53.8, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "superior", "name": "Superior", "state": "Wisconsin", "lat": 46.7208, "lon": -92.1041, "magnetic_lat": 55.4, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.34, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "syracuse", "name": "Syracuse", "state": "New York", "lat": 43.0481, "lon": -76.1474, "magnetic_lat": 52.4, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 58.2 }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.1, "clear_nights_per_year": 0.5, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "takotna", "name": "Takotna", "state": "Alaska", "lat": 62.9917, "lon": -156.0672, "magnetic_lat": 62.6, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 4.29, "clear_nights_per_year": 23.2, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "talkeetna", "name": "Talkeetna", "state": "Alaska", "lat": 62.3206, "lon": -150.1067, "magnetic_lat": 62.9, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "nov" ], "peak_clear_nights": 4.41, "clear_nights_per_year": 24.4, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "tanacross", "name": "Tanacross", "state": "Alaska", "lat": 63.3858, "lon": -143.3453, "magnetic_lat": 65, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 8.23, "clear_nights_per_year": 42.9, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "tanana", "name": "Tanana", "state": "Alaska", "lat": 65.1719, "lon": -152.0756, "magnetic_lat": 65.2, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 9.68, "clear_nights_per_year": 49.8, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "tatitlek", "name": "Tatitlek", "state": "Alaska", "lat": 60.8706, "lon": -146.6919, "magnetic_lat": 62.1, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "nov" ], "peak_clear_nights": 2.78, "clear_nights_per_year": 16.4, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "teller", "name": "Teller", "state": "Alaska", "lat": 65.2403, "lon": -166.3606, "magnetic_lat": 63.1, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "feb", "mar" ], "peak_clear_nights": 3.5, "clear_nights_per_year": 18.1, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "tenakee-springs", "name": "Tenakee Springs", "state": "Alaska", "lat": 57.7794, "lon": -135.2186, "magnetic_lat": 61, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.16, "clear_nights_per_year": 7.3, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "tetlin", "name": "Tetlin", "state": "Alaska", "lat": 63.1375, "lon": -142.5236, "magnetic_lat": 64.9, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 8.32, "clear_nights_per_year": 43.2, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "thorne-bay", "name": "Thorne Bay", "state": "Alaska", "lat": 55.6847, "lon": -132.5356, "magnetic_lat": 59.4, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "feb" ], "peak_clear_nights": 0.47, "clear_nights_per_year": 2.6, "verdict": "few_nights", "last_threshold_date": "2026-04-19", "last_noticeable_date": "2026-03-22" }, { "slug": "togiak", "name": "Togiak", "state": "Alaska", "lat": 59.0625, "lon": -160.3769, "magnetic_lat": 58.2, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.56, "clear_nights_per_year": 3, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "tok", "name": "Tok", "state": "Alaska", "lat": 63.3364, "lon": -142.9856, "magnetic_lat": 65, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 8.28, "clear_nights_per_year": 43, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "toksook-bay", "name": "Toksook Bay", "state": "Alaska", "lat": 60.5417, "lon": -165.0847, "magnetic_lat": 58.8, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "topeka", "name": "Topeka", "state": "Kansas", "lat": 39.0473, "lon": -95.689, "magnetic_lat": 47.5, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 32.4 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "traverse-city", "name": "Traverse City", "state": "Michigan", "lat": 44.7631, "lon": -85.6206, "magnetic_lat": 53.8, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "sep", "may" ], "peak_clear_nights": 0.13, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "tucson", "name": "Tucson", "state": "Arizona", "lat": 32.2226, "lon": -110.9747, "magnetic_lat": 39.3, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 0.9 }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2024-05-11", "last_noticeable_date": "2024-05-11" }, { "slug": "tulsa", "name": "Tulsa", "state": "Oklahoma", "lat": 36.154, "lon": -95.9928, "magnetic_lat": 44.6, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 10.4 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "tuluksak", "name": "Tuluksak", "state": "Alaska", "lat": 61.0969, "lon": -160.9683, "magnetic_lat": 60, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.58, "clear_nights_per_year": 9.6, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "tuntutuliak", "name": "Tuntutuliak", "state": "Alaska", "lat": 60.3353, "lon": -162.6672, "magnetic_lat": 59, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.47, "clear_nights_per_year": 2.8, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "tununak", "name": "Tununak", "state": "Alaska", "lat": 60.5764, "lon": -165.2708, "magnetic_lat": 58.9, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "oct" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.2, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "twin-hills", "name": "Twin Hills", "state": "Alaska", "lat": 59.0806, "lon": -160.2756, "magnetic_lat": 58.2, "kp_horizon": 5, "kp_noticeable": 6, "kp_bright": 7, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 0.56, "clear_nights_per_year": 3, "verdict": "few_nights", "last_threshold_date": "2026-04-18", "last_noticeable_date": "2026-03-22" }, { "slug": "two-harbors", "name": "Two Harbors", "state": "Minnesota", "lat": 47.0227, "lon": -91.6704, "magnetic_lat": 55.8, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.28, "clear_nights_per_year": 1.7, "verdict": "few_nights", "last_threshold_date": "2026-03-14", "last_noticeable_date": "2026-01-21" }, { "slug": "two-rivers", "name": "Two Rivers", "state": "Alaska", "lat": 64.8711, "lon": -147.0339, "magnetic_lat": 65.8, "kp_horizon": 2, "kp_noticeable": 3, "kp_bright": 4, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "feb" ], "peak_clear_nights": 8.84, "clear_nights_per_year": 44.9, "verdict": "regular", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-09-07" }, { "slug": "tyonek", "name": "Tyonek", "state": "Alaska", "lat": 61.0669, "lon": -151.1381, "magnetic_lat": 61.6, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "nov", "oct" ], "peak_clear_nights": 1.54, "clear_nights_per_year": 9.3, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-25" }, { "slug": "unalakleet", "name": "Unalakleet", "state": "Alaska", "lat": 63.8719, "lon": -160.7892, "magnetic_lat": 62.7, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 3.86, "clear_nights_per_year": 20.4, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "unalaska", "name": "Unalaska", "state": "Alaska", "lat": 53.8739, "lon": -166.5406, "magnetic_lat": 52.2, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 50.4 }, "best_months": [ "nov", "oct", "jan" ], "peak_clear_nights": 0.04, "clear_nights_per_year": 0.2, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-01-01" }, { "slug": "upper-kalskag", "name": "Upper Kalskag", "state": "Alaska", "lat": 61.5428, "lon": -160.3122, "magnetic_lat": 60.5, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "dec" ], "peak_clear_nights": 1.56, "clear_nights_per_year": 9.6, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-03-22" }, { "slug": "valdez", "name": "Valdez", "state": "Alaska", "lat": 61.1308, "lon": -146.3483, "magnetic_lat": 62.4, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "feb" ], "peak_clear_nights": 3.8, "clear_nights_per_year": 21.5, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "venetie", "name": "Venetie", "state": "Alaska", "lat": 67.0083, "lon": -146.3667, "magnetic_lat": 67.8, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 14.48, "clear_nights_per_year": 75.9, "verdict": "regular", "last_threshold_date": "2026-03-31", "last_noticeable_date": "2026-03-30" }, { "slug": "virginia-beach", "name": "Virginia Beach", "state": "Virginia", "lat": 36.8529, "lon": -75.978, "magnetic_lat": 46.2, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 17.9 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "wainwright", "name": "Wainwright", "state": "Alaska", "lat": 70.6356, "lon": -160.0306, "magnetic_lat": 69, "kp_horizon": 1, "kp_noticeable": 2, "kp_bright": 3, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "feb", "dec" ], "peak_clear_nights": 10.17, "clear_nights_per_year": 36.9, "verdict": "regular", "last_threshold_date": "2026-03-23", "last_noticeable_date": "2026-03-23" }, { "slug": "wales", "name": "Wales", "state": "Alaska", "lat": 65.6092, "lon": -168.0889, "magnetic_lat": 63.2, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "feb", "mar" ], "peak_clear_nights": 2.85, "clear_nights_per_year": 14, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "wasilla", "name": "Wasilla", "state": "Alaska", "lat": 61.5814, "lon": -149.4396, "magnetic_lat": 62.3, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "nov" ], "peak_clear_nights": 3.61, "clear_nights_per_year": 20.9, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "watertown", "name": "Watertown", "state": "New York", "lat": 43.9748, "lon": -75.9108, "magnetic_lat": 53.3, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "oct", "may" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2025-11-12" }, { "slug": "wenatchee", "name": "Wenatchee", "state": "Washington", "lat": 47.4235, "lon": -120.3103, "magnetic_lat": 53.2, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "aug", "sep", "oct" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.7, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "white-mountain", "name": "White Mountain", "state": "Alaska", "lat": 64.6856, "lon": -163.4128, "magnetic_lat": 63, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 3.84, "clear_nights_per_year": 22.1, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "whittier", "name": "Whittier", "state": "Alaska", "lat": 60.7744, "lon": -148.6839, "magnetic_lat": 61.7, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "nov", "mar", "jan" ], "peak_clear_nights": 1.22, "clear_nights_per_year": 7.3, "verdict": "occasional", "last_threshold_date": "2026-04-03", "last_noticeable_date": "2026-04-02" }, { "slug": "wichita", "name": "Wichita", "state": "Kansas", "lat": 37.6872, "lon": -97.3301, "magnetic_lat": 46.1, "kp_horizon": 9, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 17.2 }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "verdict": "storm_only", "last_threshold_date": "2003-10-29", "last_noticeable_date": "2003-10-29" }, { "slug": "williston", "name": "Williston", "state": "North Dakota", "lat": 48.147, "lon": -103.618, "magnetic_lat": 55.9, "kp_horizon": 6, "kp_noticeable": 7, "kp_bright": 8, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "sep", "nov", "oct" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.3, "verdict": "few_nights", "last_threshold_date": "2026-07-04", "last_noticeable_date": "2026-01-21" }, { "slug": "willow", "name": "Willow", "state": "Alaska", "lat": 61.7456, "lon": -150.0417, "magnetic_lat": 62.4, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "mar", "jan", "nov" ], "peak_clear_nights": 3.94, "clear_nights_per_year": 22.8, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-03" }, { "slug": "wilmington", "name": "Wilmington", "state": "Delaware", "lat": 39.7391, "lon": -75.5398, "magnetic_lat": 49.1, "kp_horizon": 8, "kp_noticeable": 9, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 26.4 }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.08, "clear_nights_per_year": 0.3, "verdict": "storm_only", "last_threshold_date": "2025-11-12", "last_noticeable_date": "2003-10-29" }, { "slug": "wrangell", "name": "Wrangell", "state": "Alaska", "lat": 56.4708, "lon": -132.3769, "magnetic_lat": 60.2, "kp_horizon": 4, "kp_noticeable": 5, "kp_bright": 6, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "oct", "nov" ], "peak_clear_nights": 1.19, "clear_nights_per_year": 7.4, "verdict": "occasional", "last_threshold_date": "2026-08-29", "last_noticeable_date": "2026-04-19" }, { "slug": "yakima", "name": "Yakima", "state": "Washington", "lat": 46.6021, "lon": -120.5059, "magnetic_lat": 52.4, "kp_horizon": 7, "kp_noticeable": 8, "kp_bright": 9, "oval": { "state": "northern_horizon", "elevation_deg": 58.2 }, "best_months": [ "aug", "sep", "oct" ], "peak_clear_nights": 0.16, "clear_nights_per_year": 0.8, "verdict": "storm_only", "last_threshold_date": "2026-01-21", "last_noticeable_date": "2025-11-12" }, { "slug": "yakutat", "name": "Yakutat", "state": "Alaska", "lat": 59.5467, "lon": -139.7272, "magnetic_lat": 62, "kp_horizon": 3, "kp_noticeable": 4, "kp_bright": 5, "oval": { "state": "overhead", "elevation_deg": null }, "best_months": [ "feb", "mar", "jan" ], "peak_clear_nights": 2.72, "clear_nights_per_year": 17.5, "verdict": "occasional", "last_threshold_date": "2026-09-07", "last_noticeable_date": "2026-04-18" } ], "states": [ { "slug": "ak", "name": "Alaska", "city_count": 212, "representative_city": { "slug": "venetie", "name": "Venetie" }, "best_months": [ "jan", "mar", "dec" ], "peak_clear_nights": 14.48, "clear_nights_per_year": 75.9, "clear_nights_per_year_range": [ 0, 75.9 ], "peak_clear_nights_range": [ 0.02, 14.94 ], "kp_horizon_range": [ 1, 8 ], "magnetic_lat_range": [ 48.8, 71.1 ], "verdict": "regular", "oval": { "state": "overhead", "elevation_deg": null }, "last_threshold_date": "2026-09-07" }, { "slug": "al", "name": "Alabama", "city_count": 2, "representative_city": { "slug": "birmingham", "name": "Birmingham" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 42.5, 43.8 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 5.3 }, "last_threshold_date": "2003-10-29" }, { "slug": "ar", "name": "Arkansas", "city_count": 2, "representative_city": { "slug": "fayetteville", "name": "Fayetteville" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 43.5, 44.7 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 10.7 }, "last_threshold_date": "2003-10-29" }, { "slug": "az", "name": "Arizona", "city_count": 4, "representative_city": { "slug": "flagstaff", "name": "Flagstaff" }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 39.3, 42.2 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 4.8 }, "last_threshold_date": "2024-05-11" }, { "slug": "ca", "name": "California", "city_count": 9, "representative_city": { "slug": "fresno", "name": "Fresno" }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.01, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 39.1, 46.2 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 5.9 }, "last_threshold_date": "2024-05-11" }, { "slug": "co", "name": "Colorado", "city_count": 4, "representative_city": { "slug": "fort-collins", "name": "Fort Collins" }, "best_months": [ "nov", "mar", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.2, "clear_nights_per_year_range": [ 0, 0.2 ], "peak_clear_nights_range": [ 0.01, 0.07 ], "kp_horizon_range": [ 8, 9 ], "magnetic_lat_range": [ 46.5, 48.3 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 18.6 }, "last_threshold_date": "2025-11-12" }, { "slug": "ct", "name": "Connecticut", "city_count": 2, "representative_city": { "slug": "hartford", "name": "Hartford" }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.18, "clear_nights_per_year": 1, "clear_nights_per_year_range": [ 0.3, 1 ], "peak_clear_nights_range": [ 0.07, 0.18 ], "kp_horizon_range": [ 7, 8 ], "magnetic_lat_range": [ 50.7, 51.1 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 26.4 }, "last_threshold_date": "2026-07-04" }, { "slug": "de", "name": "Delaware", "city_count": 1, "representative_city": { "slug": "wilmington", "name": "Wilmington" }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.08, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0.3, 0.3 ], "peak_clear_nights_range": [ 0.08, 0.08 ], "kp_horizon_range": [ 8, 8 ], "magnetic_lat_range": [ 49.1, 49.1 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 26.4 }, "last_threshold_date": "2025-11-12" }, { "slug": "fl", "name": "Florida", "city_count": 2, "representative_city": { "slug": "jacksonville", "name": "Jacksonville" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.01, 0.01 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 35, 39.6 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 1.2 }, "last_threshold_date": "2024-05-11" }, { "slug": "ga", "name": "Georgia", "city_count": 1, "representative_city": { "slug": "atlanta", "name": "Atlanta" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 42.9, 42.9 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 6.1 }, "last_threshold_date": "2003-10-29" }, { "slug": "ia", "name": "Iowa", "city_count": 2, "representative_city": { "slug": "cedar-rapids", "name": "Cedar Rapids" }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0.3, 0.3 ], "peak_clear_nights_range": [ 0.07, 0.08 ], "kp_horizon_range": [ 8, 8 ], "magnetic_lat_range": [ 50.2, 50.7 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 72.8 }, "last_threshold_date": "2025-11-12" }, { "slug": "id", "name": "Idaho", "city_count": 4, "representative_city": { "slug": "sandpoint", "name": "Sandpoint" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.39, "clear_nights_per_year": 1.8, "clear_nights_per_year_range": [ 0.2, 1.8 ], "peak_clear_nights_range": [ 0.06, 0.39 ], "kp_horizon_range": [ 6, 8 ], "magnetic_lat_range": [ 50, 54.5 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 62.7 }, "last_threshold_date": "2026-07-04" }, { "slug": "il", "name": "Illinois", "city_count": 1, "representative_city": { "slug": "chicago", "name": "Chicago" }, "best_months": [ "oct", "nov", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0.3, 0.3 ], "peak_clear_nights_range": [ 0.07, 0.07 ], "kp_horizon_range": [ 8, 8 ], "magnetic_lat_range": [ 50.9, 50.9 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 84.1 }, "last_threshold_date": "2025-11-12" }, { "slug": "in", "name": "Indiana", "city_count": 1, "representative_city": { "slug": "indianapolis", "name": "Indianapolis" }, "best_months": [ "oct", "nov", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0.3, 0.3 ], "peak_clear_nights_range": [ 0.07, 0.07 ], "kp_horizon_range": [ 8, 8 ], "magnetic_lat_range": [ 48.8, 48.8 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 22.9 }, "last_threshold_date": "2025-11-12" }, { "slug": "ks", "name": "Kansas", "city_count": 2, "representative_city": { "slug": "topeka", "name": "Topeka" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 46.1, 47.5 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 32.4 }, "last_threshold_date": "2003-10-29" }, { "slug": "ky", "name": "Kentucky", "city_count": 2, "representative_city": { "slug": "lexington", "name": "Lexington" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.01, 0.01 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 47.2, 47.3 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 27.7 }, "last_threshold_date": "2003-10-29" }, { "slug": "la", "name": "Louisiana", "city_count": 2, "representative_city": { "slug": "baton-rouge", "name": "Baton Rouge" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 38.8, 39.3 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 0.9 }, "last_threshold_date": "2003-10-29" }, { "slug": "ma", "name": "Massachusetts", "city_count": 1, "representative_city": { "slug": "boston", "name": "Boston" }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.17, "clear_nights_per_year": 0.9, "clear_nights_per_year_range": [ 0.9, 0.9 ], "peak_clear_nights_range": [ 0.17, 0.17 ], "kp_horizon_range": [ 7, 7 ], "magnetic_lat_range": [ 51.7, 51.7 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "last_threshold_date": "2026-07-04" }, { "slug": "md", "name": "Maryland", "city_count": 2, "representative_city": { "slug": "baltimore", "name": "Baltimore" }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0.3, 0.3 ], "peak_clear_nights_range": [ 0.07, 0.07 ], "kp_horizon_range": [ 8, 8 ], "magnetic_lat_range": [ 48.6, 48.9 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 21 }, "last_threshold_date": "2025-11-12" }, { "slug": "me", "name": "Maine", "city_count": 7, "representative_city": { "slug": "rangeley", "name": "Rangeley" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.39, "clear_nights_per_year": 2.2, "clear_nights_per_year_range": [ 0.8, 2.2 ], "peak_clear_nights_range": [ 0.16, 0.39 ], "kp_horizon_range": [ 6, 7 ], "magnetic_lat_range": [ 53, 56.2 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 54.1 }, "last_threshold_date": "2026-07-04" }, { "slug": "mi", "name": "Michigan", "city_count": 9, "representative_city": { "slug": "mackinaw-city", "name": "Mackinaw City" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.26, "clear_nights_per_year": 1.6, "clear_nights_per_year_range": [ 0.7, 1.6 ], "peak_clear_nights_range": [ 0.13, 0.26 ], "kp_horizon_range": [ 6, 7 ], "magnetic_lat_range": [ 51.5, 56.4 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 84.1 }, "last_threshold_date": "2026-07-04" }, { "slug": "mn", "name": "Minnesota", "city_count": 9, "representative_city": { "slug": "international-falls", "name": "International Falls" }, "best_months": [ "oct", "sep", "aug" ], "peak_clear_nights": 0.68, "clear_nights_per_year": 5, "clear_nights_per_year_range": [ 0.8, 5 ], "peak_clear_nights_range": [ 0.18, 0.68 ], "kp_horizon_range": [ 5, 7 ], "magnetic_lat_range": [ 52.7, 57.2 ], "verdict": "few_nights", "oval": { "state": "overhead", "elevation_deg": null }, "last_threshold_date": "2026-07-04" }, { "slug": "mo", "name": "Missouri", "city_count": 2, "representative_city": { "slug": "kansas-city", "name": "Kansas City" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 47.5, 47.7 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 36.4 }, "last_threshold_date": "2003-10-29" }, { "slug": "ms", "name": "Mississippi", "city_count": 1, "representative_city": { "slug": "jackson-ms", "name": "Jackson" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 41.2, 41.2 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 3.3 }, "last_threshold_date": "2003-10-29" }, { "slug": "mt", "name": "Montana", "city_count": 8, "representative_city": { "slug": "glasgow", "name": "Glasgow" }, "best_months": [ "sep", "nov", "oct" ], "peak_clear_nights": 0.38, "clear_nights_per_year": 2.1, "clear_nights_per_year_range": [ 0.7, 2.1 ], "peak_clear_nights_range": [ 0.12, 0.38 ], "kp_horizon_range": [ 6, 7 ], "magnetic_lat_range": [ 52.6, 55.6 ], "verdict": "few_nights", "oval": { "state": "overhead", "elevation_deg": null }, "last_threshold_date": "2026-07-04" }, { "slug": "nc", "name": "North Carolina", "city_count": 2, "representative_city": { "slug": "charlotte", "name": "Charlotte" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 44.5, 45.1 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 10 }, "last_threshold_date": "2003-10-29" }, { "slug": "nd", "name": "North Dakota", "city_count": 5, "representative_city": { "slug": "bismarck", "name": "Bismarck" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.41, "clear_nights_per_year": 2.5, "clear_nights_per_year_range": [ 2.2, 2.5 ], "peak_clear_nights_range": [ 0.36, 0.41 ], "kp_horizon_range": [ 6, 6 ], "magnetic_lat_range": [ 54.8, 56.3 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 78.4 }, "last_threshold_date": "2026-07-04" }, { "slug": "ne", "name": "Nebraska", "city_count": 2, "representative_city": { "slug": "lincoln", "name": "Lincoln" }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.08, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0.3, 0.3 ], "peak_clear_nights_range": [ 0.08, 0.08 ], "kp_horizon_range": [ 8, 8 ], "magnetic_lat_range": [ 49.2, 49.7 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 27.7 }, "last_threshold_date": "2025-11-12" }, { "slug": "nh", "name": "New Hampshire", "city_count": 3, "representative_city": { "slug": "pittsburg-nh", "name": "Pittsburg" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.35, "clear_nights_per_year": 1.9, "clear_nights_per_year_range": [ 0.7, 1.9 ], "peak_clear_nights_range": [ 0.15, 0.35 ], "kp_horizon_range": [ 6, 7 ], "magnetic_lat_range": [ 52.6, 54.4 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 58.2 }, "last_threshold_date": "2026-07-04" }, { "slug": "nj", "name": "New Jersey", "city_count": 2, "representative_city": { "slug": "atlantic-city", "name": "Atlantic City" }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0.3, 0.3 ], "peak_clear_nights_range": [ 0.07, 0.07 ], "kp_horizon_range": [ 8, 8 ], "magnetic_lat_range": [ 48.7, 50.1 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 21.9 }, "last_threshold_date": "2025-11-12" }, { "slug": "nm", "name": "New Mexico", "city_count": 2, "representative_city": { "slug": "albuquerque", "name": "Albuquerque" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 42.6, 43.3 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 5.5 }, "last_threshold_date": "2003-10-29" }, { "slug": "nv", "name": "Nevada", "city_count": 2, "representative_city": { "slug": "las-vegas", "name": "Las Vegas" }, "best_months": [ "may", "oct", "jan" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 42.8, 45.5 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 5.9 }, "last_threshold_date": "2024-05-11" }, { "slug": "ny", "name": "New York", "city_count": 8, "representative_city": { "slug": "plattsburgh", "name": "Plattsburgh" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.36, "clear_nights_per_year": 1.9, "clear_nights_per_year_range": [ 0.3, 1.9 ], "peak_clear_nights_range": [ 0.07, 0.36 ], "kp_horizon_range": [ 6, 8 ], "magnetic_lat_range": [ 50.1, 54 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 43.9 }, "last_threshold_date": "2026-07-04" }, { "slug": "oh", "name": "Ohio", "city_count": 2, "representative_city": { "slug": "columbus", "name": "Columbus" }, "best_months": [ "oct", "nov", "may" ], "peak_clear_nights": 0.07, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0.2, 0.3 ], "peak_clear_nights_range": [ 0.05, 0.07 ], "kp_horizon_range": [ 8, 8 ], "magnetic_lat_range": [ 49.1, 50.7 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 26.4 }, "last_threshold_date": "2025-11-12" }, { "slug": "ok", "name": "Oklahoma", "city_count": 2, "representative_city": { "slug": "oklahoma-city", "name": "Oklahoma City" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 43.8, 44.6 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 8.1 }, "last_threshold_date": "2003-10-29" }, { "slug": "or", "name": "Oregon", "city_count": 4, "representative_city": { "slug": "portland", "name": "Portland" }, "best_months": [ "aug", "sep", "oct" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.7, "clear_nights_per_year_range": [ 0, 0.7 ], "peak_clear_nights_range": [ 0.02, 0.14 ], "kp_horizon_range": [ 7, 9 ], "magnetic_lat_range": [ 47.8, 51 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 25.1 }, "last_threshold_date": "2026-01-21" }, { "slug": "pa", "name": "Pennsylvania", "city_count": 4, "representative_city": { "slug": "erie", "name": "Erie" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.14, "clear_nights_per_year": 0.7, "clear_nights_per_year_range": [ 0.2, 0.7 ], "peak_clear_nights_range": [ 0.06, 0.14 ], "kp_horizon_range": [ 7, 8 ], "magnetic_lat_range": [ 49.3, 51.4 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 30.7 }, "last_threshold_date": "2026-07-04" }, { "slug": "ri", "name": "Rhode Island", "city_count": 1, "representative_city": { "slug": "providence", "name": "Providence" }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.17, "clear_nights_per_year": 0.9, "clear_nights_per_year_range": [ 0.9, 0.9 ], "peak_clear_nights_range": [ 0.17, 0.17 ], "kp_horizon_range": [ 7, 7 ], "magnetic_lat_range": [ 51.2, 51.2 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 27.7 }, "last_threshold_date": "2026-07-04" }, { "slug": "sc", "name": "South Carolina", "city_count": 2, "representative_city": { "slug": "charleston-sc", "name": "Charleston" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.01, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 42, 43.2 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 4.5 }, "last_threshold_date": "2003-10-29" }, { "slug": "sd", "name": "South Dakota", "city_count": 3, "representative_city": { "slug": "sioux-falls", "name": "Sioux Falls" }, "best_months": [ "oct", "nov", "sep" ], "peak_clear_nights": 0.19, "clear_nights_per_year": 0.9, "clear_nights_per_year_range": [ 0.8, 0.9 ], "peak_clear_nights_range": [ 0.15, 0.19 ], "kp_horizon_range": [ 7, 7 ], "magnetic_lat_range": [ 51.9, 53.7 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 41.2 }, "last_threshold_date": "2026-01-21" }, { "slug": "tn", "name": "Tennessee", "city_count": 2, "representative_city": { "slug": "memphis", "name": "Memphis" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 44, 45.2 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 8.6 }, "last_threshold_date": "2003-10-29" }, { "slug": "tx", "name": "Texas", "city_count": 7, "representative_city": { "slug": "arlington", "name": "Arlington" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 37.7, 41.2 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 3.1 }, "last_threshold_date": "2024-05-11" }, { "slug": "ut", "name": "Utah", "city_count": 2, "representative_city": { "slug": "park-city", "name": "Park City" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.02, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.02, 0.02 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 47.6, 47.7 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 34.3 }, "last_threshold_date": "2003-10-29" }, { "slug": "va", "name": "Virginia", "city_count": 2, "representative_city": { "slug": "richmond", "name": "Richmond" }, "best_months": [ "oct", "jan", "feb" ], "peak_clear_nights": 0.01, "clear_nights_per_year": 0, "clear_nights_per_year_range": [ 0, 0 ], "peak_clear_nights_range": [ 0.01, 0.01 ], "kp_horizon_range": [ 9, 9 ], "magnetic_lat_range": [ 46.2, 46.9 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 24 }, "last_threshold_date": "2003-10-29" }, { "slug": "vt", "name": "Vermont", "city_count": 3, "representative_city": { "slug": "newport-vt", "name": "Newport" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.35, "clear_nights_per_year": 1.8, "clear_nights_per_year_range": [ 0.7, 1.8 ], "peak_clear_nights_range": [ 0.14, 0.35 ], "kp_horizon_range": [ 6, 7 ], "magnetic_lat_range": [ 53.8, 54.3 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 54.1 }, "last_threshold_date": "2026-07-04" }, { "slug": "wa", "name": "Washington", "city_count": 7, "representative_city": { "slug": "omak", "name": "Omak" }, "best_months": [ "sep", "oct", "nov" ], "peak_clear_nights": 0.43, "clear_nights_per_year": 2.1, "clear_nights_per_year_range": [ 0.5, 2.1 ], "peak_clear_nights_range": [ 0.12, 0.43 ], "kp_horizon_range": [ 6, 7 ], "magnetic_lat_range": [ 52.4, 54.3 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 54.1 }, "last_threshold_date": "2026-07-04" }, { "slug": "wi", "name": "Wisconsin", "city_count": 7, "representative_city": { "slug": "eagle-river", "name": "Eagle River" }, "best_months": [ "oct", "sep", "nov" ], "peak_clear_nights": 0.33, "clear_nights_per_year": 2.2, "clear_nights_per_year_range": [ 0.6, 2.2 ], "peak_clear_nights_range": [ 0.14, 0.34 ], "kp_horizon_range": [ 6, 7 ], "magnetic_lat_range": [ 52, 55.6 ], "verdict": "few_nights", "oval": { "state": "northern_horizon", "elevation_deg": 78.4 }, "last_threshold_date": "2026-07-04" }, { "slug": "wv", "name": "West Virginia", "city_count": 2, "representative_city": { "slug": "morgantown", "name": "Morgantown" }, "best_months": [ "oct", "nov", "mar" ], "peak_clear_nights": 0.06, "clear_nights_per_year": 0.3, "clear_nights_per_year_range": [ 0, 0.3 ], "peak_clear_nights_range": [ 0.01, 0.06 ], "kp_horizon_range": [ 8, 9 ], "magnetic_lat_range": [ 47.6, 48.9 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 24 }, "last_threshold_date": "2025-11-12" }, { "slug": "wy", "name": "Wyoming", "city_count": 5, "representative_city": { "slug": "sheridan", "name": "Sheridan" }, "best_months": [ "nov", "oct", "sep" ], "peak_clear_nights": 0.15, "clear_nights_per_year": 0.8, "clear_nights_per_year_range": [ 0.2, 0.8 ], "peak_clear_nights_range": [ 0.05, 0.15 ], "kp_horizon_range": [ 7, 8 ], "magnetic_lat_range": [ 48.8, 52.2 ], "verdict": "storm_only", "oval": { "state": "northern_horizon", "elevation_deg": 50.4 }, "last_threshold_date": "2026-01-21" } ] }