Fog in Charleston, WV

daily fog outlook & 2016–2026 climatology
Fog possible — NWS guidance shows a fog signal in the next 48 hours. August typically brings about 34 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Yeager Airport (KCRW). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KCRWYeager Airport207 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 Charleston fogs in

Fog here concentrates in September and August — about 207 hours in a typical year at KCRW, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KCRW station page.

Fog season

January: ~8 hJanFebruary: ~6 hFebMarch: ~6 hMarApril: ~5 hAprMay: ~23 hMayJune: ~15 hJunJuly: ~28 hJulAugust: ~34 hAugSeptember: ~42 hSepOctober: ~24 hOctNovember: ~13 hNovDecember: ~6 hDec
Fog season runs May through November, peaking in September; fog is mostly a 2 AM–7 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.