{"icao":"ESNN","name":"Sundsvall-H\u00e4rn\u00f6sand Airport","lat":62.5281,"lon":17.4439,"country":"SE","tz":"Europe/Stockholm","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":257,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["November","September"],"monthlyHours":[21,23,16,12,10,9,11,23,36,36,39,26],"medianEventHours":1,"season":{"summary":"Fog season runs July through May, peaking in November; fog is mostly a 8 PM\u20136 AM phenomenon; typically thinning out by 9 AM; a typical event lasts about 1 hour (local time, 10-year average).","months":["January","February","March","April","May","July","August","September","October","November","December"],"timeOfDay":"8 PM\u20136 AM","typicallyClearsBy":"9 AM"}},"forecast":{"covered":false,"public":false,"wording":"No fog forecast feed exists for this station. September typically brings about 36 hours of dense fog here (10-year average)."},"links":{"page":"https://fogatlas.org/fog/esnn/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=ESNN","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/ESNN.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}