Fog in Glendive, MT

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 1 hour of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

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

Measuring station

stationairportfog hours/yrforecast
KGDVDawson Community Airport40 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 Glendive fogs in

Fog here concentrates in January and December — about 40 hours in a typical year at KGDV, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KGDV station page.

Fog season

January: ~10 hJanFebruary: ~4 hFebMarch: ~4 hMarApril: ~3 hAprMay: ~0 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~1 hAugSeptember: ~2 hSepOctober: ~2 hOctNovember: ~7 hNovDecember: ~7 hDec
Fog season runs November through April, peaking in January; fog is mostly a 2 AM–8 AM phenomenon; typically thinning out by 11 AM; 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.