Fog in Jamestown, ND

daily fog outlook & 2016–2026 climatology
Fog unlikely through Sunday (peak 6%). August typically brings about 8 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Jamestown Regional Airport (KJMS). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KJMSJamestown Regional Airport72 h/yrlive forecast

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 Jamestown fogs in

Fog here concentrates in March and December — about 72 hours in a typical year at KJMS, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KJMS station page.

Fog season

January: ~10 hJanFebruary: ~7 hFebMarch: ~11 hMarApril: ~6 hAprMay: ~2 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~8 hAugSeptember: ~5 hSepOctober: ~3 hOctNovember: ~6 hNovDecember: ~11 hDec
Fog season runs August through April, peaking in March; fog is mostly a 3 AM–9 AM phenomenon; typically thinning out by 2 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.