Climate
Along with the rest of south-west England, the Blackdown Hills have a temperate climate that is generally wetter and milder than the rest of England. The mean temperature is approximately 10 °C (50 °F) and shows a seasonal and a diurnal variation, but because of the modifying effect of the sea the range is less than in most other parts of the United Kingdom (UK). January is the coldest month with mean minimum temperatures between 1 °C (34 °F) and 2 °C (36 °F). July and August are the warmest months, with mean daily maxima around 21 °C (70 °F). December is normally the most cloudy month and June the sunniest. High pressure over the Azores often brings clear skies to south-west England, particularly in summer.
Cloud often forms inland, especially near hills. The average annual sunshine totals around 1,600 hours. Rainfall tends to be associated with Atlantic depressions or with convection. In summer, convection caused by solar surface heating sometimes forms shower clouds, and a large proportion of rain falls from showers and thunderstorms at this time of year. Average rainfall is around 35–40 inch (900–1200 mm). About 8–15 days of snowfall is typical. From November to March, mean wind speeds are highest; winds are lightest from June to August. The predominant wind direction is from the south-west.
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