Fog in Saint-Jacques-de-la-Lande, Ille-et-Vilaine

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 Rennes-Saint-Jacques Airport (LFRN). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
LFRNRennes-Saint-Jacques Airport168 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 Saint-Jacques-de-la-Lande, Ille-et-Vilaine fogs in

Fog here concentrates in October and December — about 168 hours in a typical year at LFRN, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the LFRN station page.

Fog season

January: ~18 hJanFebruary: ~20 hFebMarch: ~11 hMarApril: ~10 hAprMay: ~8 hMayJune: ~3 hJunJuly: ~1 hJulAugust: ~4 hAugSeptember: ~10 hSepOctober: ~30 hOctNovember: ~27 hNovDecember: ~29 hDec
Fog season runs September through May, peaking in October; fog is mostly a 2 AM–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.