UIBB — Bratsk Airport

fog forecast & climatology · Bratsk city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 13 hours of dense fog here (10-year average).

Fog hours per year
110 h below CAT I minima (2016–2026 average)
Fog season
February and December
Typical fog event
~1 h once it forms (middle half 1–3 h, n=517)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Bratsk Airport spends 110 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in February and December. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~15 hJanFebruary: ~17 hFebMarch: ~7 hMarApril: ~5 hAprMay: ~3 hMayJune: ~3 hJunJuly: ~8 hJulAugust: ~14 hAugSeptember: ~13 hSepOctober: ~5 hOctNovember: ~7 hNovDecember: ~15 hDec
Fog season runs July through April, peaking in February; fog is mostly a 3 AM–10 AM phenomenon; typically thinning out by noon; 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.