{"city":"Alton/St Louis","region":"US-IL","country":"US","slug":"alton-st-louis-il","updated":"2026-08-16T02:45Z","window":{"start":"2016-01-01","through":"2026-08-15"},"stations":[{"icao":"KALN","name":"St Louis Regional Airport","subCat1HoursPerYear":31,"forecast":"verifying"}],"primaryStation":"KALN","forecast":{"covered":true,"public":false,"cycle":"2026-08-16T00:00:00Z","guidanceSignal":false,"wording":"No fog signal in NWS guidance for the next 48 hours. August typically brings about 3 hours of dense fog here."},"climatology":{"subCat1HoursPerYear":31,"fogSeasonPeakMonths":["February","December"],"medianEventHours":2,"season":{"summary":"Fog season is January, February, May, July, August, September, October, November, December, peaking in December; fog is mostly a 2 AM\u20136 AM phenomenon; typically thinning out by 9 AM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","May","July","August","September","October","November","December"],"timeOfDay":"2 AM\u20136 AM","typicallyClearsBy":"9 AM"}},"links":{"page":"https://fogatlas.org/fog/city/alton-st-louis-il/","stationPages":["https://fogatlas.org/fog/kaln/"],"verification":"https://fogatlas.org/fog/scorecard/"}}