Fog in Gwinn, MI

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 15 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Marquette/Sawyer International Airport (KSAW). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KSAWMarquette/Sawyer International Airport182 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 Gwinn fogs in

Fog here concentrates in December and April — about 182 hours in a typical year at KSAW, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KSAW station page.

Fog season

January: ~15 hJanFebruary: ~10 hFebMarch: ~21 hMarApril: ~23 hAprMay: ~11 hMayJune: ~11 hJunJuly: ~7 hJulAugust: ~15 hAugSeptember: ~18 hSepOctober: ~11 hOctNovember: ~9 hNovDecember: ~32 hDec
Fog season runs August through June, peaking in December; fog is mostly a 3 AM–10 AM phenomenon; typically thinning out by 7 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.