FOON — M'Vengue El Hadj Omar Bongo Ondimba International Airport

fog forecast & climatology · Franceville city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 4 hours of dense fog here (10-year average).

Fog hours per year
174 h below CAT I minima (2016–2026 average)
Fog season
March and May
Typical fog event
~1 h once it forms (middle half 1–2 h, n=624)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year M'Vengue El Hadj Omar Bongo Ondimba International Airport spends 174 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in March and May. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~9 hJanFebruary: ~8 hFebMarch: ~42 hMarApril: ~11 hAprMay: ~16 hMayJune: ~11 hJunJuly: ~4 hJulAugust: ~1 hAugSeptember: ~4 hSepOctober: ~7 hOctNovember: ~10 hNovDecember: ~14 hDec
Fog season is March, April, May, June, December, peaking in March; fog is mostly a 5 AM–7 AM phenomenon; typically thinning out by 9 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.