Fog in Karaj

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 Payam International Airport (OIIP). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
OIIPPayam International Airport72 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 Karaj fogs in

Fog here concentrates in December and February — about 72 hours in a typical year at OIIP, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the OIIP station page.

Fog season

January: ~17 hJanFebruary: ~17 hFebMarch: ~1 hMarApril: ~3 hAprMay: ~0 hMayJune: ~1 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~0 hSepOctober: ~1 hOctNovember: ~9 hNovDecember: ~22 hDec
Fog season runs November through February, peaking in December; fog is mostly a 2 AM–10 AM phenomenon; typically thinning out by 2 PM; a typical event lasts about 2 hours once it forms local time · 10-yr average

Machine access: data.json · llms.txt · forecast verification. Not for operational use.