Fog in Blountville, TN

daily fog outlook & 2016–2026 climatology
Some chance of fog — peaks at 27% around 7 am Sunday.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Tri-Cities Regional TN/VA Airport (KTRI). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KTRITri-Cities Regional TN/VA Airport108 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 Blountville fogs in

Fog here concentrates in September and October — about 108 hours in a typical year at KTRI, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KTRI station page.

Fog season

January: ~9 hJanFebruary: ~6 hFebMarch: ~3 hMarApril: ~4 hAprMay: ~8 hMayJune: ~7 hJunJuly: ~8 hJulAugust: ~13 hAugSeptember: ~16 hSepOctober: ~14 hOctNovember: ~9 hNovDecember: ~13 hDec
Fog season runs April through February, peaking in September; fog is mostly a 4 AM–8 AM phenomenon; typically thinning out by 9 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.