sentences:  By some sources, it is the warmest place in Germany.Under the Köppen system, Ihringen closely borders an incredibly rare 48°N humid subtropical climate ("Cfa"), with mildly cold winters and long, hot summers.The city is close to the Kaiserstuhl, a range of hills of volcanic origin located a few miles away which is considered to be one of the warmest places of Germany and therefore considered as a viticultural area.