Fog in Lancaster, PA

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 Lancaster Airport (KLNS). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KLNSLancaster Airport90 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 Lancaster fogs in

Fog here concentrates in February and December — about 90 hours in a typical year at KLNS, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KLNS station page.

Fog season

January: ~12 hJanFebruary: ~14 hFebMarch: ~9 hMarApril: ~3 hAprMay: ~7 hMayJune: ~2 hJunJuly: ~2 hJulAugust: ~5 hAugSeptember: ~8 hSepOctober: ~10 hOctNovember: ~6 hNovDecember: ~13 hDec
Fog season is January, February, March, May, August, September, October, November, December, peaking in February; fog is mostly a 1 AM–8 AM phenomenon; typically thinning out by 10 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.