{"icao":"KCMI","name":"University of Illinois Willard Airport","lat":40.0398,"lon":-88.2762,"country":"US","tz":"America/Chicago","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":90,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["January","December"],"monthlyHours":[19,11,9,3,5,2,4,5,5,4,11,13],"medianEventHours":2,"season":{"summary":"Fog season is January, February, March, May, August, September, November, December, peaking in January; fog is mostly a midnight\u20138 AM phenomenon; typically thinning out by 11 AM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","March","May","August","September","November","December"],"timeOfDay":"midnight\u20138 AM","typicallyClearsBy":"11 AM"}},"forecast":{"covered":true,"public":true,"cycle":"2026-09-04T13:00:00Z","peakPct":2,"peakAtLocal":"2026-09-05T07:00:00-05:00","wording":"No, fog is unlikely in the next 36 hours \u2014 the calibrated forecast peaks at just 2%. September typically brings about 5 hours of dense fog here."},"links":{"page":"https://fogatlas.org/fog/kcmi/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KCMI","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KCMI.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}