Fog in London, Essex

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 5 hours of dense fog here (10-year average).

Measured at London Stansted Airport (EGSS). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
EGSSLondon Stansted Airport220 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 London, Essex fogs in

Fog here concentrates in December and November — about 220 hours in a typical year at EGSS, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the EGSS station page.

Fog season

January: ~32 hJanFebruary: ~16 hFebMarch: ~19 hMarApril: ~14 hAprMay: ~10 hMayJune: ~5 hJunJuly: ~1 hJulAugust: ~5 hAugSeptember: ~10 hSepOctober: ~19 hOctNovember: ~32 hNovDecember: ~59 hDec
Fog season runs October through March, peaking in December; fog is mostly a 11 PM–9 AM phenomenon; typically thinning out by 11 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.