Fog in Peterborough, ON

daily fog outlook & 2016–2026 climatology
Some chance of fog — peaks at 33% around 5 am Monday.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Peterborough Regional Airport (CYPQ). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
CYPQPeterborough Regional Airport123 h/yrlive forecast

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 Peterborough fogs in

Fog here concentrates in September and October — about 123 hours in a typical year at CYPQ, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the CYPQ station page.

Fog season

January: ~5 hJanFebruary: ~5 hFebMarch: ~7 hMarApril: ~4 hAprMay: ~7 hMayJune: ~3 hJunJuly: ~6 hJulAugust: ~14 hAugSeptember: ~31 hSepOctober: ~16 hOctNovember: ~15 hNovDecember: ~15 hDec
Fog season runs August through December, peaking in September; fog is mostly a 1 AM–8 AM phenomenon; typically thinning out by 10 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.