Fog in Chassieu, Lyon

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. dense fog (visibility under a mile) is rare here in August (10-year average).

Measured at Lyon Bron Airport (LFLY). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
LFLYLyon Bron Airport90 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 Chassieu, Lyon fogs in

Fog here concentrates in December and January — about 90 hours in a typical year at LFLY, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the LFLY station page.

Fog season

January: ~22 hJanFebruary: ~3 hFebMarch: ~1 hMarApril: ~0 hAprMay: ~0 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~0 hSepOctober: ~5 hOctNovember: ~19 hNovDecember: ~42 hDec
Fog season runs November through January, peaking in December; fog is mostly a midnight–10 AM phenomenon; typically thinning out by noon; 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.