{"icao":"KPSM","name":"Portsmouth International Airport at Pease","lat":43.0779,"lon":-70.8233,"country":"US","tz":"America/New_York","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":129,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["October","September"],"monthlyHours":[8,10,13,8,11,11,10,8,16,17,5,14],"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"}},"forecast":{"covered":true,"public":true,"cycle":"2026-09-04T13:00:00Z","peakPct":10,"peakAtLocal":"2026-09-05T02:00:00-04:00","wording":"No, fog is unlikely in the next 36 hours \u2014 the calibrated forecast peaks at just 10%. September typically brings about 16 hours of dense fog here."},"links":{"page":"https://fogatlas.org/fog/kpsm/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KPSM","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KPSM.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}