Fog in Stockholm / Västerås

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 12 hours of dense fog here (10-year average).

Measured at Stockholm Västerås Airport (ESOW). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
ESOWStockholm Västerås Airport171 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 Stockholm / Västerås fogs in

Fog here concentrates in September and January — about 171 hours in a typical year at ESOW, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the ESOW station page.

Fog season

January: ~25 hJanFebruary: ~13 hFebMarch: ~20 hMarApril: ~6 hAprMay: ~3 hMayJune: ~5 hJunJuly: ~6 hJulAugust: ~12 hAugSeptember: ~26 hSepOctober: ~17 hOctNovember: ~17 hNovDecember: ~24 hDec
Fog season runs August through March, peaking in September; fog is mostly a 9 PM–7 AM phenomenon; typically thinning out by 10 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.