Globally, 2015 set a new record for the most extremely warm days in the 66-year record (1.8 times more than the average). The number of extremely warm days and nights was the highest ever recorded in western North America, parts of central Europe, and central Asia.
Cool conditions prevailed across large parts of the North America in 2014. Everywhere else, the frequency of warm days was higher than average, and the frequency of cold nights was below average.