Fog in Roberval, QC

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. dense fog (visibility under a mile) is rare here in August.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Roberval Airport (CYRJ). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
CYRJRoberval Airport54 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 Roberval fogs in

Fog here concentrates in April and March — about 54 hours in a typical year at CYRJ, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the CYRJ station page.

Fog season

January: ~4 hJanFebruary: ~6 hFebMarch: ~9 hMarApril: ~9 hAprMay: ~6 hMayJune: ~3 hJunJuly: ~1 hJulAugust: ~0 hAugSeptember: ~1 hSepOctober: ~4 hOctNovember: ~4 hNovDecember: ~7 hDec
Fog season runs October through June, peaking in March; fog here can hit at any hour of the day; 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.