Fog in Montréal, QC

daily fog outlook & 2016–2026 climatology
Fog unlikely through Monday (peak 3%). August typically brings about 2 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Montréal / Saint-Hubert Metropolitan Airport (CYHU). Forecast percentages for this station have passed live verification.

Measuring stations

stationairportfog hours/yrforecast
CYHUMontréal / Saint-Hubert Metropolitan Airport34 h/yrlive forecast
CYMXMontreal Mirabel International Airport32 h/yrlive forecast
CYULMontreal / Pierre Elliott Trudeau International Airport13 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 Montréal fogs in

Fog here concentrates in November and March — about 34 hours in a typical year at CYHU, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the CYHU station page.

Fog season

January: ~3 hJanFebruary: ~4 hFebMarch: ~5 hMarApril: ~2 hAprMay: ~1 hMayJune: ~0 hJunJuly: ~1 hJulAugust: ~2 hAugSeptember: ~2 hSepOctober: ~4 hOctNovember: ~5 hNovDecember: ~5 hDec
Fog season runs August through April, peaking in March; fog is mostly a 3 AM–10 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.