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Climate of London


London, the capital and largest city in England and the United Kingdom has a temperate oceanic climate, with warm summers and cool but not cold winters. While the city annually has modest precipitation, there are long periods of overcast skies and frequent light mist-type precipitation, which is likely responsible for the rainy image of the city.

The coldest temperature ever measured in London was −21.1 °C (−6.0 °F) on 25 January 1947, and the highest temperature ever recorded was 38.1 °C (100.6 °F), measured at Kew Gardens during the European Heat Wave of 2003. London averages about 1600 hours of sunshine annually. London's large built-up area creates a microclimate (an "urban heat island"), with heat stored by the city's buildings. Sometimes temperatures are 5 °C (9 °F) warmer in the city than in the surrounding areas.

The weather station enclosure is the most elevated of any in the London area, and as a result daytime temperatures are typically one degree lower than Heathrow, Kew, Northolt and Greenwich.

Temperature extremes range from 37.7 °C (99.9 °F) in August 2003, down to −16.1 °C (3.0 °F) in January 1962.


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