Fog in Roanoke, VA

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 1 hour of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Roanoke–Blacksburg Regional Airport (KROA). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KROARoanoke–Blacksburg Regional Airport32 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 Roanoke fogs in

Fog here concentrates in December and January — about 32 hours in a typical year at KROA, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KROA station page.

Fog season

January: ~7 hJanFebruary: ~5 hFebMarch: ~1 hMarApril: ~1 hAprMay: ~2 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~1 hAugSeptember: ~1 hSepOctober: ~2 hOctNovember: ~2 hNovDecember: ~9 hDec
Fog season runs December through February, peaking in December; fog here can hit at any hour of the day; 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.