Yes, there have been hot days across northern Europe before; however, the frequency of very hot weather has increased substantially.

It may not have gotten the headlines of this year’s heatwave, but we were in Switzerland and Germany for a month last July. For three of those four weeks, it was stinking hot. The maximum temperatures weren’t so bad, but the nights were oppressive, and there was no letup. If that’s going to be the norm most summers, it absolutely justifies investing in air conditioning.