Fog in Rochester, MN

daily fog outlook & 2016–2026 climatology
Fog unlikely through Sunday (peak 9%). August typically brings about 5 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Rochester International Airport (KRST). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KRSTRochester International Airport86 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 Rochester fogs in

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

Fog season

January: ~16 hJanFebruary: ~10 hFebMarch: ~9 hMarApril: ~5 hAprMay: ~2 hMayJune: ~1 hJunJuly: ~5 hJulAugust: ~5 hAugSeptember: ~5 hSepOctober: ~3 hOctNovember: ~6 hNovDecember: ~19 hDec
Fog season is January, February, March, April, July, August, September, November, December, peaking in December; fog is mostly a 3 AM–8 AM phenomenon; typically thinning out by 11 AM; 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.