Fog in La Crosse, WI

daily fog outlook & 2016–2026 climatology
Fog possible — NWS guidance shows a fog signal in the next 48 hours. August typically brings about 4 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at La Crosse Regional Airport (KLSE). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KLSELa Crosse Regional Airport42 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 La Crosse fogs in

Fog here concentrates in September and January — about 42 hours in a typical year at KLSE, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KLSE station page.

Fog season

January: ~5 hJanFebruary: ~4 hFebMarch: ~3 hMarApril: ~2 hAprMay: ~3 hMayJune: ~2 hJunJuly: ~2 hJulAugust: ~4 hAugSeptember: ~6 hSepOctober: ~4 hOctNovember: ~2 hNovDecember: ~4 hDec
Fog season is year-round, peaking in September; fog is mostly a 4 AM–8 AM phenomenon; typically thinning out by 9 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.