SBRB — Rio Branco-Plácido de Castro International Airport

fog forecast & climatology · Rio Branco city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 5 hours of dense fog here (10-year average).

Fog hours per year
49 h below CAT I minima (2016–2026 average)
Fog season
March and June
Typical fog event
~1 h once it forms (middle half 1–2 h, n=275)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Rio Branco-Plácido de Castro International Airport spends 49 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in March and June. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

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

For flight operations

EFVS crews: the CHASE board ranks airports by live fog status, approach lighting, go-around height and flight time from your base. Forecast probabilities publish here per-airport once the calibrated model beats climatology on live verification — receipts on the scorecard. Methodology.

Sources: NOAA/NWS National Blend of Models guidance · METAR observations 2016–2026 (Iowa Environmental Mesonet) · FAA NASR. Machine access: data.json · llms.txt. Not for operational use.