Fog in Alpena, MI

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 Alpena County Regional Airport (KAPN). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KAPNAlpena County Regional Airport60 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 Alpena fogs in

Fog here concentrates in September and December — about 60 hours in a typical year at KAPN, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KAPN station page.

Fog season

January: ~7 hJanFebruary: ~5 hFebMarch: ~5 hMarApril: ~5 hAprMay: ~5 hMayJune: ~2 hJunJuly: ~2 hJulAugust: ~4 hAugSeptember: ~12 hSepOctober: ~6 hOctNovember: ~1 hNovDecember: ~7 hDec
Fog season is January, February, March, April, May, August, September, October, December, peaking in September; fog is mostly a 1 AM–9 AM phenomenon; typically thinning out by 1 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.