{"icao":"KGRR","name":"Gerald R. Ford International Airport","lat":42.8808,"lon":-85.5228,"country":"US","tz":"America/Detroit","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":46,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["January","December"],"monthlyHours":[11,5,3,3,2,2,1,3,3,3,3,7],"medianEventHours":2,"season":{"summary":"Fog season runs August through April, peaking in January; fog is mostly a 4 AM\u20139 AM phenomenon; typically thinning out by 1 PM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","March","April","August","September","October","November","December"],"timeOfDay":"4 AM\u20139 AM","typicallyClearsBy":"1 PM"}},"forecast":{"covered":true,"public":false,"cycle":"2026-09-04T13:00:00Z","guidanceSignal":false,"wording":"No fog signal in NWS guidance for the next 48 hours. September typically brings about 3 hours of dense fog here."},"links":{"page":"https://fogatlas.org/fog/kgrr/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KGRR","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KGRR.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}