Fog in Stewart, BC

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 4 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

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

Measuring station

stationairportfog hours/yrforecast
CZSTStewart Airport62 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 Stewart fogs in

Fog here concentrates in October and December — about 62 hours in a typical year at CZST, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the CZST station page.

Fog season

January: ~4 hJanFebruary: ~2 hFebMarch: ~2 hMarApril: ~0 hAprMay: ~1 hMayJune: ~0 hJunJuly: ~2 hJulAugust: ~4 hAugSeptember: ~4 hSepOctober: ~5 hOctNovember: ~2 hNovDecember: ~5 hDec
Fog season runs July through March, peaking in October; fog is mostly a 6 AM–9 AM phenomenon; typically thinning out by 11 AM; 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.