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Temperature extremes for all sites in the London region range from 38.1°C (100.6°F) at Kew during August 2003 down to -16.1°C (3.0°F) at Northolt during January 1962.
Summers are mild, but generally warm. The region's average July high is 24°C (75.2°F). On average London will see 31 days above 25°C (77.0°F) each year, and 4.2 days above 30.0°C (86.0°F) every year.
During the 2003 European heat wave there were 14 consecutive days above 30°C (86.0°F) and 2 consecutive days where temperatures reached 38°C (100.4°F).
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.