EFJO — Joensuu Airport

fog forecast & climatology · Joensuu city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 22 hours of dense fog here (10-year average).

Fog hours per year
191 h below CAT I minima (2016–2026 average)
Fog season
November and December
Typical fog event
~1 h once it forms (middle half 1–3 h, n=778)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Joensuu Airport spends 191 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in November and December. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~24 hJanFebruary: ~15 hFebMarch: ~16 hMarApril: ~11 hAprMay: ~4 hMayJune: ~2 hJunJuly: ~3 hJulAugust: ~7 hAugSeptember: ~22 hSepOctober: ~25 hOctNovember: ~39 hNovDecember: ~28 hDec
Fog season runs September through April, peaking in November; fog here can hit at any hour of the day; 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.