Fog in Concord, NH

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 7 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Concord Municipal Airport (KCON). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KCONConcord Municipal Airport104 h/yrverifying

Fog is measured where instruments live — airports. Hours/yr = time below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), the aviation definition of seriously dense fog.

When Concord fogs in

Fog here concentrates in October and September — about 104 hours in a typical year at KCON, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KCON station page.

Fog season

January: ~7 hJanFebruary: ~7 hFebMarch: ~8 hMarApril: ~4 hAprMay: ~5 hMayJune: ~5 hJunJuly: ~4 hJulAugust: ~7 hAugSeptember: ~15 hSepOctober: ~22 hOctNovember: ~7 hNovDecember: ~14 hDec
Fog season runs August through March, peaking in October; fog is mostly a 3 AM–8 AM phenomenon; typically thinning out by 9 AM; a typical event lasts about 2 hours once it forms local time · 10-yr average

Machine access: data.json · llms.txt · forecast verification. Not for operational use.