Fog in Helston

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 58 hours of dense fog here (10-year average).

Measured at RNAS Culdrose (EGDR). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
EGDRRNAS Culdrose501 h/yrclimatology

Fog is measured where instruments live — airports. Hours/yr = time below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), the aviation definition of seriously dense fog.

When Helston fogs in

Fog here concentrates in August and June — about 501 hours in a typical year at EGDR, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the EGDR station page.

Fog season

January: ~35 hJanFebruary: ~45 hFebMarch: ~37 hMarApril: ~24 hAprMay: ~40 hMayJune: ~51 hJunJuly: ~51 hJulAugust: ~58 hAugSeptember: ~49 hSepOctober: ~46 hOctNovember: ~18 hNovDecember: ~46 hDec
Fog season is year-round, peaking in August; fog here can hit at any hour of the day; a typical event lasts about 2 hours once it forms local time · 10-yr average

Machine access: data.json · llms.txt · forecast verification. Not for operational use.