Fog in Westfield, MA

daily fog outlook & 2016–2026 climatology
Fog unlikely through Monday (peak 4%). 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 Westfield-Barnes Regional Airport (KBAF). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KBAFWestfield-Barnes Regional Airport69 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 Westfield fogs in

Fog here concentrates in December and October — about 69 hours in a typical year at KBAF, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KBAF station page.

Fog season

January: ~6 hJanFebruary: ~6 hFebMarch: ~8 hMarApril: ~1 hAprMay: ~3 hMayJune: ~4 hJunJuly: ~5 hJulAugust: ~4 hAugSeptember: ~7 hSepOctober: ~10 hOctNovember: ~4 hNovDecember: ~12 hDec
Fog season runs May through March, peaking in December; fog is mostly a 3 AM–7 AM phenomenon; typically thinning out by 10 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.