Fog in Wiarton, ON

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 2 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

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

Measuring station

stationairportfog hours/yrforecast
CYVVWiarton Airport63 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 Wiarton fogs in

Fog here concentrates in January and February — about 63 hours in a typical year at CYVV, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the CYVV station page.

Fog season

January: ~11 hJanFebruary: ~8 hFebMarch: ~5 hMarApril: ~4 hAprMay: ~7 hMayJune: ~6 hJunJuly: ~5 hJulAugust: ~2 hAugSeptember: ~3 hSepOctober: ~2 hOctNovember: ~3 hNovDecember: ~7 hDec
Fog season is January, February, March, April, May, June, July, September, November, December, peaking in January; fog is mostly a 3 AM–11 AM phenomenon; typically thinning out by 7 PM; 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.