Fog in Crescent City, CA

daily fog outlook & 2016–2026 climatology
Fog possible — NWS guidance shows a fog signal in the next 48 hours. August typically brings about 32 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Jack Mc Namara Field Airport (KCEC). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KCECJack Mc Namara Field Airport186 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 Crescent City fogs in

Fog here concentrates in October and September — about 186 hours in a typical year at KCEC, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KCEC station page.

Fog season

January: ~7 hJanFebruary: ~8 hFebMarch: ~7 hMarApril: ~5 hAprMay: ~6 hMayJune: ~9 hJunJuly: ~17 hJulAugust: ~32 hAugSeptember: ~40 hSepOctober: ~41 hOctNovember: ~15 hNovDecember: ~5 hDec
Fog season runs July through November, peaking in October; fog is mostly a 3 AM–8 AM phenomenon; typically thinning out by 10 AM; a typical event lasts about 1 hour once it forms local time · 10-yr average

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