EGPO — Stornoway Airport

fog forecast & climatology · Stornoway, Western Isles 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
85 h below CAT I minima (2016–2026 average)
Fog season
September and July
Typical fog event
~1 h once it forms (middle half 1–2 h, n=507)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Stornoway Airport spends 85 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in September and July. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

January: ~2 hJanFebruary: ~3 hFebMarch: ~6 hMarApril: ~8 hAprMay: ~6 hMayJune: ~8 hJunJuly: ~13 hJulAugust: ~12 hAugSeptember: ~13 hSepOctober: ~6 hOctNovember: ~3 hNovDecember: ~5 hDec
Fog season is March, April, May, June, July, August, September, October, December, peaking in July; fog is mostly a 8 PM–5 AM phenomenon; typically thinning out by 8 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.