KDAY — James M. Cox Dayton International Airport

fog forecast & climatology · Dayton city page · full 10-year analysis →
Fog unlikely through Saturday (peak 2%). September typically brings about 3 hours of dense fog here.forecast cycle 2026-09-04T13:00:00Z · page rebuilt daily · live layers below update hourly

Fog hours per year
57 h below CAT I minima (2016–2026 average)
Fog season
February and January
Typical fog event
~2 h once it forms (middle half 1–4 h, n=200)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year James M. Cox Dayton International Airport spends 57 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in February and January. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

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

Runway infrastructure

endapproach lightsbest approachlengthRVR
06LALSF-2CAT III10,901 ftRVR
24RMALSRCAT I10,901 ftRVR
06R—LPV7,285 ft—
24LMALSRCAT I7,285 ftRVR
18MALSRCAT I8,502 ftRVR
36——8,502 ft—

From FAA NASR / curated AIP Canada research. Approach-light class and minima tier drive how low an approach can be flown — details in the chase board.

For flight operations

EFVS crews: the CHASE board ranks airports by live fog status, approach lighting, go-around height and flight time from your base. Forecast probabilities publish here per-airport once the calibrated model beats climatology on live verification — receipts on the scorecard. Methodology.

Sources: NOAA/NWS National Blend of Models guidance · METAR observations 2016–2026 (Iowa Environmental Mesonet) · FAA NASR. Machine access: data.json · llms.txt. Not for operational use.