Fog in Vaasa

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 11 hours of dense fog here (10-year average).

Measured at Vaasa Airport (EFVA). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
EFVAVaasa Airport135 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 Vaasa fogs in

Fog here concentrates in September and December — about 135 hours in a typical year at EFVA, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the EFVA station page.

Fog season

January: ~10 hJanFebruary: ~14 hFebMarch: ~10 hMarApril: ~7 hAprMay: ~4 hMayJune: ~6 hJunJuly: ~9 hJulAugust: ~11 hAugSeptember: ~20 hSepOctober: ~16 hOctNovember: ~14 hNovDecember: ~16 hDec
Fog season runs June through April, peaking in September; fog is mostly a midnight–9 AM phenomenon; typically thinning out by noon; 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.