Fog in Missoula, 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 Missoula Montana Airport (KMSO). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KMSOMissoula Montana Airport78 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 Missoula fogs in

Fog here concentrates in January and December — about 78 hours in a typical year at KMSO, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KMSO station page.

Fog season

January: ~34 hJanFebruary: ~4 hFebMarch: ~4 hMarApril: ~1 hAprMay: ~0 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~1 hAugSeptember: ~0 hSepOctober: ~5 hOctNovember: ~13 hNovDecember: ~16 hDec
Fog season runs November through January, peaking in January; fog is mostly a 4 AM–9 AM phenomenon; typically thinning out by noon; 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.