CYZH — Slave Lake Airport

fog forecast & climatology · Slave Lake city page · full 10-year analysis →
Fog unlikely through Friday (peak 3%). September typically brings about 2 hours of dense fog here.forecast cycle 2026-09-04T13:00:00Z · page rebuilt daily · live layers below update hourly

Fog hours per year
52 h below CAT I minima (2016–2026 average)
Fog season
August and January
Typical fog event
~2 h once it forms (middle half 1–3 h, n=207)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Slave Lake Airport spends 52 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in August and January. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

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

For flight operations

EFVS crews: the CHASE board ranks airports by live fog status, approach lighting, go-around height and flight time from your base. Forecast probabilities publish here per-airport once the calibrated model beats climatology on live verification — receipts on the scorecard. Methodology.

Sources: NOAA/NWS National Blend of Models guidance · METAR observations 2016–2026 (Iowa Environmental Mesonet) · FAA NASR. Machine access: data.json · llms.txt. Not for operational use.