Fog in Massena, NY

daily fog outlook & 2016–2026 climatology
Fog unlikely through Monday (peak 10%). 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 Massena International Airport Richards Field (KMSS). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KMSSMassena International Airport Richards Field52 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 Massena fogs in

Fog here concentrates in September and December — about 52 hours in a typical year at KMSS, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KMSS station page.

Fog season

January: ~4 hJanFebruary: ~4 hFebMarch: ~4 hMarApril: ~2 hAprMay: ~2 hMayJune: ~2 hJunJuly: ~4 hJulAugust: ~3 hAugSeptember: ~9 hSepOctober: ~6 hOctNovember: ~5 hNovDecember: ~7 hDec
Fog season runs July through March, peaking in September; fog is mostly a midnight–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.