{"city":"Chicago/Prospect Heights/Wheeling","region":"US-IL","country":"US","slug":"chicago-prospect-heights-wheeling-il","updated":"2026-08-16T02:45Z","window":{"start":"2016-01-01","through":"2026-08-15"},"stations":[{"icao":"KPWK","name":"Chicago Executive Airport","subCat1HoursPerYear":20,"forecast":"live forecast"}],"primaryStation":"KPWK","forecast":{"covered":true,"public":true,"cycle":"2026-08-16T00:00:00Z","peakPct":5,"peakAtLocal":"2026-08-16T05:00:00-05:00","wording":"No, fog is unlikely in the next 36 hours \u2014 the calibrated forecast peaks at just 5%. August typically brings about 1 hour of dense fog here."},"climatology":{"subCat1HoursPerYear":20,"fogSeasonPeakMonths":["January","December"],"medianEventHours":1,"season":{"summary":"Fog season runs December through January, peaking in January; fog is mostly a 8 PM\u20135 AM phenomenon; typically thinning out by 10 AM; a typical event lasts about 1 hour (local time, 10-year average).","months":["January","December"],"timeOfDay":"8 PM\u20135 AM","typicallyClearsBy":"10 AM"}},"links":{"page":"https://fogatlas.org/fog/city/chicago-prospect-heights-wheeling-il/","stationPages":["https://fogatlas.org/fog/kpwk/"],"verification":"https://fogatlas.org/fog/scorecard/"}}