{"icao":"KACK","name":"Nantucket Memorial Airport","lat":41.2531,"lon":-70.0602,"country":"US","tz":"America/New_York","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":248,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["July","June"],"monthlyHours":[10,14,18,17,26,41,51,26,21,11,5,6],"medianEventHours":2,"season":{"summary":"Fog season runs February through September, peaking in July; fog is mostly a 10 PM\u20138 AM phenomenon; typically thinning out by 11 AM; a typical event lasts about 2 hours (local time, 10-year average).","months":["February","March","April","May","June","July","August","September"],"timeOfDay":"10 PM\u20138 AM","typicallyClearsBy":"11 AM"}},"forecast":{"covered":true,"public":true,"cycle":"2026-09-04T13:00:00Z","peakPct":8,"peakAtLocal":"2026-09-04T22:00:00-04:00","wording":"No, fog is unlikely in the next 36 hours \u2014 the calibrated forecast peaks at just 8%. September typically brings about 21 hours of dense fog here."},"links":{"page":"https://fogatlas.org/fog/kack/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KACK","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KACK.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}