Fog in Chicopee, MA

daily fog outlook & 2016–2026 climatology
Fog unlikely through Sunday (peak 3%). August typically brings about 3 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Westover Metropolitan Airport / Westover Air Reserve Base (KCEF). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KCEFWestover Metropolitan Airport / Westover Air Reserve Base54 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 Chicopee fogs in

Fog here concentrates in December and October — about 54 hours in a typical year at KCEF, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KCEF station page.

Fog season

January: ~6 hJanFebruary: ~5 hFebMarch: ~5 hMarApril: ~1 hAprMay: ~2 hMayJune: ~3 hJunJuly: ~4 hJulAugust: ~3 hAugSeptember: ~4 hSepOctober: ~8 hOctNovember: ~4 hNovDecember: ~10 hDec
Fog season runs June through March, peaking in December; fog is mostly a 4 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.