{"city":"Portsmouth","region":"US-NH","country":"US","slug":"portsmouth-nh","updated":"2026-08-16T02:45Z","window":{"start":"2016-01-01","through":"2026-08-15"},"stations":[{"icao":"KPSM","name":"Portsmouth International Airport at Pease","subCat1HoursPerYear":129,"forecast":"live forecast"}],"primaryStation":"KPSM","forecast":{"covered":true,"public":true,"cycle":"2026-08-16T00:00:00Z","peakPct":3,"peakAtLocal":"2026-08-17T08:00:00-04:00","wording":"No, fog is unlikely in the next 36 hours \u2014 the calibrated forecast peaks at just 3%. August typically brings about 8 hours of dense fog here."},"climatology":{"subCat1HoursPerYear":129,"fogSeasonPeakMonths":["October","September"],"medianEventHours":2,"season":{"summary":"Fog season is year-round, peaking in October; fog is mostly a 11 PM\u20137 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","May","June","July","August","September","October","November","December"],"timeOfDay":"11 PM\u20137 AM","typicallyClearsBy":"10 AM"}},"links":{"page":"https://fogatlas.org/fog/city/portsmouth-nh/","stationPages":["https://fogatlas.org/fog/kpsm/"],"verification":"https://fogatlas.org/fog/scorecard/"}}