Europe One Degree Warmer
An analysis of over 100 million meteorological data points, from 118 years of weatherdata, shows that every major city in Europe is warmer in the 21st century than it was in the 20th, with the average city being 1°C warmer compared to last century.
Methodology
Here you can find an extensive methodological note on how the data has been obtained and analysed, and what have been the methodological questions underpinning the process.