Fog in Calgary, AB

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 Calgary International Airport (CYYC). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring stations

stationairportfog hours/yrforecast
CYYCCalgary International Airport51 h/yrverifying
CYBWCalgary / Springbank Airport100 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 Calgary fogs in

Fog here concentrates in January and March — about 51 hours in a typical year at CYYC, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the CYYC station page.

Fog season

January: ~9 hJanFebruary: ~5 hFebMarch: ~8 hMarApril: ~4 hAprMay: ~0 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~1 hSepOctober: ~7 hOctNovember: ~8 hNovDecember: ~8 hDec
Fog season runs October through April, peaking in January; fog is mostly a 6 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.