Fog in Jamestown, NY

daily fog outlook & 2016–2026 climatology
Some chance of fog — peaks at 24% around 5 am Monday.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Chautauqua County-Jamestown Airport (KJHW). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KJHWChautauqua County-Jamestown Airport150 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 Jamestown fogs in

Fog here concentrates in August and September — about 150 hours in a typical year at KJHW, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KJHW station page.

Fog season

January: ~15 hJanFebruary: ~13 hFebMarch: ~13 hMarApril: ~8 hAprMay: ~11 hMayJune: ~7 hJunJuly: ~16 hJulAugust: ~19 hAugSeptember: ~17 hSepOctober: ~10 hOctNovember: ~5 hNovDecember: ~16 hDec
Fog season is year-round, peaking in August; fog is mostly a 3 AM–8 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.