Fog in La Grande Rivière, QC

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 12 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at La Grande Rivière Airport (CYGL). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
CYGLLa Grande Rivière Airport103 h/yrverifying

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 La Grande Rivière fogs in

Fog here concentrates in July and June — about 103 hours in a typical year at CYGL, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the CYGL station page.

Fog season

January: ~3 hJanFebruary: ~2 hFebMarch: ~3 hMarApril: ~5 hAprMay: ~9 hMayJune: ~12 hJunJuly: ~22 hJulAugust: ~12 hAugSeptember: ~11 hSepOctober: ~8 hOctNovember: ~9 hNovDecember: ~8 hDec
Fog season runs May through December, peaking in July; fog is mostly a 2 AM–8 AM phenomenon; typically thinning out by 11 AM; 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.