Fog in Billings, MT

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. dense fog (visibility under a mile) is rare here in August.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Billings Logan International Airport (KBIL). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KBILBillings Logan International Airport46 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 Billings fogs in

Fog here concentrates in March and December — about 46 hours in a typical year at KBIL, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KBIL station page.

Fog season

January: ~5 hJanFebruary: ~2 hFebMarch: ~10 hMarApril: ~3 hAprMay: ~4 hMayJune: ~1 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~3 hSepOctober: ~3 hOctNovember: ~7 hNovDecember: ~8 hDec
Fog season is January, March, April, May, September, October, November, December, peaking in March; fog is mostly a 10 PM–9 AM phenomenon; typically thinning out by 11 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.