Fog in Haiphong (Hai An)

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 Cat Bi International Airport (VVCI). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
VVCICat Bi International Airport4 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 Haiphong (Hai An) fogs in

Fog here concentrates in February and March — about 4 hours in a typical year at VVCI, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the VVCI station page.

Fog season

January: ~0 hJanFebruary: ~2 hFebMarch: ~1 hMarApril: ~0 hAprMay: ~0 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~0 hSepOctober: ~0 hOctNovember: ~0 hNovDecember: ~0 hDec
Fog season is February, peaking in February; fog is mostly a 1 AM–5 AM phenomenon; typically thinning out by 6 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.