Fog in Shannon

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 4 hours of dense fog here (10-year average).

Measured at Shannon Airport (EINN). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
EINNShannon Airport95 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 Shannon fogs in

Fog here concentrates in January and November — about 95 hours in a typical year at EINN, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the EINN station page.

Fog season

January: ~20 hJanFebruary: ~2 hFebMarch: ~6 hMarApril: ~6 hAprMay: ~4 hMayJune: ~1 hJunJuly: ~2 hJulAugust: ~4 hAugSeptember: ~6 hSepOctober: ~8 hOctNovember: ~20 hNovDecember: ~20 hDec
Fog season is January, March, April, September, October, November, December, peaking in January; fog is mostly a 2 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.