CYBW — Calgary / Springbank Airport

fog forecast & climatology · Calgary city page · full 10-year analysis →
Fog unlikely through Saturday (peak 5%). September typically brings about 7 hours of dense fog here.forecast cycle 2026-09-04T13:00:00Z · page rebuilt daily · live layers below update hourly

Fog hours per year
100 h below CAT I minima (2016–2026 average)
Fog season
December and November
Typical fog event
~2 h once it forms (middle half 1–3 h, n=418)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Calgary / Springbank Airport spends 100 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in December and November. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~11 hJanFebruary: ~7 hFebMarch: ~12 hMarApril: ~5 hAprMay: ~4 hMayJune: ~1 hJunJuly: ~6 hJulAugust: ~6 hAugSeptember: ~7 hSepOctober: ~14 hOctNovember: ~14 hNovDecember: ~15 hDec
Fog season runs July through May, peaking in December; fog is mostly a 3 AM–9 AM phenomenon; typically thinning out by 10 AM; 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.