Fog in Niigata

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. dense fog (visibility under a mile) is rare here in August (10-year average).

Measured at Niigata Airport (RJSN). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
RJSNNiigata Airport27 h/yrclimatology

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 Niigata fogs in

Fog here concentrates in January and February — about 27 hours in a typical year at RJSN, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the RJSN station page.

Fog season

January: ~11 hJanFebruary: ~6 hFebMarch: ~1 hMarApril: ~3 hAprMay: ~2 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~1 hSepOctober: ~1 hOctNovember: ~1 hNovDecember: ~3 hDec
Fog season is January, February, April, December, peaking in January; fog is mostly a 11 PM–11 PM phenomenon; 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.