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In page Slough:

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The nearest Met Office weather observing station to Slough is Heathrow Airport, about 5 miles (8 km) east of Slough town centre. This part of the Thames Valley is notable for generally having the warmest daytime summer temperatures on average in the British Isles.[citation needed] Typically, according to 1981–2010 normals, the average high temperature in July is 23.5 °C (74.3 °F.)