Fog in Hagerstown, MD

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 4 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Hagerstown Regional Richard A Henson Field (KHGR). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KHGRHagerstown Regional Richard A Henson Field58 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 Hagerstown fogs in

Fog here concentrates in January and December — about 58 hours in a typical year at KHGR, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KHGR station page.

Fog season

January: ~11 hJanFebruary: ~7 hFebMarch: ~4 hMarApril: ~1 hAprMay: ~4 hMayJune: ~2 hJunJuly: ~1 hJulAugust: ~4 hAugSeptember: ~5 hSepOctober: ~4 hOctNovember: ~5 hNovDecember: ~9 hDec
Fog season is January, February, March, May, August, September, October, November, December, peaking in January; fog is mostly a 1 AM–8 AM phenomenon; typically thinning out by 9 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.