Fog in Williston, ND

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 Williston Basin International Airport (KXWA). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KXWAWilliston Basin International Airport86 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 Williston fogs in

Fog here concentrates in January and December — about 86 hours in a typical year at KXWA, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KXWA station page.

Fog season

January: ~24 hJanFebruary: ~7 hFebMarch: ~6 hMarApril: ~7 hAprMay: ~1 hMayJune: ~0 hJunJuly: ~3 hJulAugust: ~1 hAugSeptember: ~3 hSepOctober: ~5 hOctNovember: ~14 hNovDecember: ~15 hDec
Fog season runs November through April, peaking in January; fog is mostly a 4 AM–10 AM phenomenon; typically thinning out by 5 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.