Fog in Denver, CO

daily fog outlook & 2016–2026 climatology
Fog possible — NWS guidance shows a fog signal in the next 48 hours. August typically brings about 2 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

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

Measuring stations

stationairportfog hours/yrforecast
KDENDenver International Airport76 h/yrverifying
KBJCRocky Mountain Metropolitan Airport36 h/yrverifying
KAPACentennial Airport20 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 Denver fogs in

Fog here concentrates in February and March — about 76 hours in a typical year at KDEN, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KDEN station page.

Fog season

January: ~10 hJanFebruary: ~16 hFebMarch: ~11 hMarApril: ~10 hAprMay: ~7 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~2 hAugSeptember: ~2 hSepOctober: ~6 hOctNovember: ~8 hNovDecember: ~2 hDec
Fog season is January, February, March, April, May, October, November, peaking in February; fog is mostly a 1 AM–9 AM phenomenon; 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.