{"city":"Dulles","region":"US-VA","country":"US","slug":"dulles-va","updated":"2026-08-16T02:45Z","window":{"start":"2016-01-01","through":"2026-08-15"},"stations":[{"icao":"KIAD","name":"Washington Dulles International Airport","subCat1HoursPerYear":32,"forecast":"verifying"}],"primaryStation":"KIAD","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. dense fog (visibility under a mile) is rare here in August."},"climatology":{"subCat1HoursPerYear":32,"fogSeasonPeakMonths":["January","December"],"medianEventHours":2,"season":{"summary":"Fog season runs October through March, peaking in January; fog is mostly a 5 AM\u20139 AM phenomenon; typically thinning out by 11 AM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","March","October","November","December"],"timeOfDay":"5 AM\u20139 AM","typicallyClearsBy":"11 AM"}},"links":{"page":"https://fogatlas.org/fog/city/dulles-va/","stationPages":["https://fogatlas.org/fog/kiad/"],"verification":"https://fogatlas.org/fog/scorecard/"}}