{"icao":"KGYY","name":"Gary/Chicago International Airport","lat":41.6171,"lon":-87.4132,"country":"US","tz":"America/Chicago","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":53,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["January","December"],"monthlyHours":[14,4,5,4,3,5,4,4,5,3,4,8],"medianEventHours":2,"season":{"summary":"Fog season is January, February, March, April, June, July, August, September, November, December, peaking in January; fog is mostly a 11 PM\u20133 AM phenomenon; typically thinning out by 11 AM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","March","April","June","July","August","September","November","December"],"timeOfDay":"11 PM\u20133 AM","typicallyClearsBy":"11 AM"}},"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 5 hours of dense fog here."},"links":{"page":"https://fogatlas.org/fog/kgyy/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KGYY","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KGYY.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}