ESSV — Visby Airport

fog forecast & climatology · Visby city page · full 10-year analysis →
No fog forecast feed exists for this station. September typically brings about 14 hours of dense fog here (10-year average).

Fog hours per year
127 h below CAT I minima (2016–2026 average)
Fog season
March and September
Typical fog event
~1 h once it forms (middle half 1–3 h, n=540)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Visby Airport spends 127 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in March and September. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~9 hJanFebruary: ~13 hFebMarch: ~22 hMarApril: ~10 hAprMay: ~10 hMayJune: ~4 hJunJuly: ~7 hJulAugust: ~5 hAugSeptember: ~14 hSepOctober: ~10 hOctNovember: ~13 hNovDecember: ~9 hDec
Fog season is January, February, March, April, May, July, September, October, November, December, peaking in March; fog is mostly a 10 PM–7 AM phenomenon; typically thinning out by 10 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.