Statistical analysis of the Madrid urban heat island

Abstract Temperature time series from three rural and one urban stations have been analysed for trends caused by the growing of Madrid city. A significant upward trend was found in the urban temperatures, but not in the rural. The analysis suggests that there was a change in the upward urban trend in the 1940s, with recent years increasing more slowly. The urban heat island intensity (urban minus rural temperature) has been related to weather types for cold and warm periods, and the persistence of the phenomenon from day to day has been calculated.

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