Fog in Slave Lake, AB

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 Slave Lake Airport (CYZH). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
CYZHSlave Lake Airport52 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 Slave Lake fogs in

Fog here concentrates in August and January — about 52 hours in a typical year at CYZH, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the CYZH station page.

Fog season

January: ~8 hJanFebruary: ~3 hFebMarch: ~4 hMarApril: ~2 hAprMay: ~3 hMayJune: ~2 hJunJuly: ~4 hJulAugust: ~12 hAugSeptember: ~2 hSepOctober: ~6 hOctNovember: ~5 hNovDecember: ~3 hDec
Fog season is January, February, March, May, July, August, October, November, December, peaking in August; fog is mostly a 4 AM–11 AM phenomenon; typically thinning out by 3 PM; 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.