Germany Experiencing High Rate of Warming

The headline in the graphic translates into English (roughly) as “Warming trend in Germany stronger than worldwide.” (See larger graphic below.)

Unfortunately, there is no accompanying article that explains this phenomenon, though there are numerous pieces detailing what Germany is doing to become more climate resilient.  My efforts to determine the cause of this phenomenon have turned up nothing other than “Germany is experiencing more heatwaves,” as if that explains anything.