Fog in Dayton, OH

daily fog outlook & 2016–2026 climatology
Fog unlikely through Monday (peak 5%). August typically brings about 3 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at James M. Cox Dayton International Airport (KDAY). Forecast percentages for this station have passed live verification.

Measuring stations

stationairportfog hours/yrforecast
KDAYJames M. Cox Dayton International Airport57 h/yrlive forecast
KFFOWright-Patterson Air Force Base22 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 Dayton fogs in

Fog here concentrates in February and January — about 57 hours in a typical year at KDAY, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KDAY station page.

Fog season

January: ~10 hJanFebruary: ~11 hFebMarch: ~7 hMarApril: ~2 hAprMay: ~2 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~3 hAugSeptember: ~3 hSepOctober: ~4 hOctNovember: ~3 hNovDecember: ~10 hDec
Fog season runs August through March, peaking in February; fog is mostly a 3 AM–10 AM phenomenon; typically thinning out by noon; 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.