Fog in Rio Branco

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 1 hour of dense fog here (10-year average).

Measured at Rio Branco-Plácido de Castro International Airport (SBRB). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
SBRBRio Branco-Plácido de Castro International Airport49 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 Rio Branco fogs in

Fog here concentrates in March and June — about 49 hours in a typical year at SBRB, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the SBRB station page.

Fog season

January: ~4 hJanFebruary: ~4 hFebMarch: ~9 hMarApril: ~5 hAprMay: ~5 hMayJune: ~6 hJunJuly: ~0 hJulAugust: ~1 hAugSeptember: ~5 hSepOctober: ~4 hOctNovember: ~4 hNovDecember: ~3 hDec
Fog season runs September through June, peaking in March; fog is mostly a 5 AM–6 AM phenomenon; typically thinning out by 8 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.