How to read the map:
Warm days are defined as being above the 90th percentile of the daily maximum temperature.
Grid boxes outlined in solid black contain at least 3 stations and so are likely to be more representative of the grid-box. Higher confidence in the long-term trend is shown by a black dot. Area averaged annual time series of percentage changes and trend lines are shown below each map for one area in northern Europe (Green line, 5.6 to 16.9 E and 56.2 to 66.2 N) and one in south-western Europe (Pink line, 350.6 to 1.9 E and 36.2 to 43.7 N).
Try to cool off without resorting to air conditioning.
The use of A/C can increase your electricity bill by 33 %. A fan requires one tenth of the energy used by an A/C system; sunshades, blinds, shutters and the cool of the night use no energy at all.
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