{"icao":"KGTF","name":"Great Falls International Airport","lat":47.482,"lon":-111.371,"country":"US","tz":"America/Denver","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":49,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["March","December"],"monthlyHours":[4,7,12,5,1,1,0,1,1,4,4,9],"medianEventHours":2,"season":{"summary":"Fog season runs October through April, peaking in March; fog is mostly a 4 AM\u20139 AM phenomenon; typically thinning out by noon; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","March","April","October","November","December"],"timeOfDay":"4 AM\u20139 AM","typicallyClearsBy":"noon"}},"forecast":{"covered":true,"public":true,"cycle":"2026-09-04T13:00:00Z","peakPct":3,"peakAtLocal":"2026-09-05T07:00:00-06:00","wording":"No, fog is unlikely in the next 36 hours \u2014 the calibrated forecast peaks at just 3%. September typically brings about 1 hour of dense fog here."},"links":{"page":"https://fogatlas.org/fog/kgtf/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KGTF","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KGTF.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}