Fog in Cormeilles-en-Vexin, Val-d'Oise

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 3 hours of dense fog here (10-year average).

Measured at Pontoise-Cormeilles Aerodrome (LFPT). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
LFPTPontoise-Cormeilles Aerodrome156 h/yrclimatology

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 Cormeilles-en-Vexin, Val-d'Oise fogs in

Fog here concentrates in December and October — about 156 hours in a typical year at LFPT, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the LFPT station page.

Fog season

January: ~31 hJanFebruary: ~23 hFebMarch: ~8 hMarApril: ~7 hAprMay: ~4 hMayJune: ~3 hJunJuly: ~0 hJulAugust: ~3 hAugSeptember: ~5 hSepOctober: ~33 hOctNovember: ~8 hNovDecember: ~55 hDec
Fog season is January, February, October, December, peaking in December; fog is mostly a 1 AM–10 AM phenomenon; typically thinning out by 1 PM; 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.