Cities create their own microclimates and their sites are almost always warmer, compared to a nearby rural location, than if the city were not there. The effect on temperatures measured in the city has been termed the 'urban heat island' (UHI). In this study we assess the strength of the UHI within and around London based on monthly and seasonal maximum, mean and minimum temperatures. The purpose of the study is not to look at UHI extremes on individually conducive days, but to show that the effect has a certain magnitude on monthly and seasonal averages, and assess whether this magnitude of UHI for Central London has increased over the twentieth century compared to rural locations around London (Jones et al., 2008).
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