Fog in Northolt, Greater London

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 1 hour of dense fog here (10-year average).

Measured at RAF Northolt (EGWU). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
EGWURAF Northolt74 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 Northolt, Greater London fogs in

Fog here concentrates in December and November — about 74 hours in a typical year at EGWU, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the EGWU station page.

Fog season

January: ~12 hJanFebruary: ~7 hFebMarch: ~5 hMarApril: ~1 hAprMay: ~1 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~1 hAugSeptember: ~2 hSepOctober: ~9 hOctNovember: ~12 hNovDecember: ~25 hDec
Fog season runs October through February, peaking in December; fog is mostly a midnight–9 AM phenomenon; typically thinning out by noon; 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.