LFOP — Rouen Vallée de Seine Airport

fog forecast & climatology · Boos city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 6 hours of dense fog here (10-year average).

Fog hours per year
186 h below CAT I minima (2016–2026 average)
Fog season
December and January
Typical fog event
~2 h once it forms (middle half 1–4 h, n=518)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Rouen Vallée de Seine Airport spends 186 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in December and January. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~43 hJanFebruary: ~17 hFebMarch: ~8 hMarApril: ~3 hAprMay: ~5 hMayJune: ~6 hJunJuly: ~2 hJulAugust: ~2 hAugSeptember: ~6 hSepOctober: ~15 hOctNovember: ~28 hNovDecember: ~55 hDec
Fog season runs October through February, peaking in December; fog is mostly a 2 AM–noon phenomenon; typically thinning out by 4 PM; a typical event lasts about 2 hours 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.