Fog in Grenchen

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 8 hours of dense fog here (10-year average).

Measured at Grenchen Airfield (LSZG). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
LSZGGrenchen Airfield488 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 Grenchen fogs in

Fog here concentrates in December and November — about 488 hours in a typical year at LSZG, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the LSZG station page.

Fog season

January: ~70 hJanFebruary: ~48 hFebMarch: ~21 hMarApril: ~7 hAprMay: ~11 hMayJune: ~6 hJunJuly: ~3 hJulAugust: ~8 hAugSeptember: ~38 hSepOctober: ~91 hOctNovember: ~97 hNovDecember: ~101 hDec
Fog season runs September through February, 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.