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The Isle of Wight also features in the list of high sunshine averages.
The number of hours of bright sunshine is controlled by the length of day and by cloudiness.
Industrial pollution and smoke haze can also reduce sunshine amounts but, since the Clean Air Act of 1956 and a decline in heavy industry, there has been an increase in sunshine duration over the London area particularly in the winter months.
Southern England includes the sunniest places in mainland UK, these being the coastal resorts of Sussex and Hampshire.
The heat-island is also evident in summer heat waves.
The graphs show the average frequency of air and ground frost at Heathrow and Hurn.