{"icao":"KDLH","name":"Duluth International Airport","lat":46.8419,"lon":-92.1987,"country":"US","tz":"America/Chicago","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":178,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["September","December"],"monthlyHours":[15,8,13,20,15,14,6,16,29,12,10,23],"medianEventHours":2,"season":{"summary":"Fog season runs August through June, peaking in September; fog is mostly a midnight\u201310 AM phenomenon; typically thinning out by 3 PM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","March","April","May","June","August","September","October","November","December"],"timeOfDay":"midnight\u201310 AM","typicallyClearsBy":"3 PM"}},"forecast":{"covered":true,"public":false,"cycle":"2026-09-04T13:00:00Z","guidanceSignal":true,"wording":"NWS guidance shows a fog signal here in the next 48 hours. This station's calibrated percentages publish after live verification clears the accuracy bar. September typically brings about 29 hours of dense fog here."},"links":{"page":"https://fogatlas.org/fog/kdlh/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KDLH","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KDLH.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}