Fog in Troy, AL

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. 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 Troy Municipal Airport at N Kenneth Campbell Field (KTOI). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KTOITroy Municipal Airport at N Kenneth Campbell Field68 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 Troy fogs in

Fog here concentrates in December and November — about 68 hours in a typical year at KTOI, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KTOI station page.

Fog season

January: ~8 hJanFebruary: ~6 hFebMarch: ~5 hMarApril: ~3 hAprMay: ~4 hMayJune: ~3 hJunJuly: ~4 hJulAugust: ~5 hAugSeptember: ~3 hSepOctober: ~4 hOctNovember: ~10 hNovDecember: ~13 hDec
Fog season is January, February, March, May, July, August, October, November, December, peaking in December; fog is mostly a 4 AM–7 AM phenomenon; typically thinning out by 8 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.