{"icao":"KMSN","name":"Dane County Regional Truax Field","lat":43.1399,"lon":-89.3375,"country":"US","tz":"America/Chicago","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":32,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["December","January"],"monthlyHours":[5,3,2,2,1,1,1,4,4,1,3,6],"medianEventHours":2,"season":{"summary":"Fog season is January, February, March, April, August, September, November, December, peaking in December; fog is mostly a midnight\u20138 AM phenomenon; typically thinning out by 10 AM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","March","April","August","September","November","December"],"timeOfDay":"midnight\u20138 AM","typicallyClearsBy":"10 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 4 hours of dense fog here."},"links":{"page":"https://fogatlas.org/fog/kmsn/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KMSN","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KMSN.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}