The climate is tundra (Köppen: ET), maintaining the only glacier present in Germany, which has observed its reduction over the years. From a climatic perspective the Zugspitze lies in the temperate zone and its prevailing winds are Westerlies. As the first high orographic obstacle to these Westerlies in the Alps, the Zugspitze is particularly exposed to the weather. It is effectively the north barrier of the Alps (Nordstau der Alpen), against which moist air masses pile up and release heavy precipitation. At the same time the Zugspitze acts as a protective barrier for the Alpine ranges to the south. By contrast, Föhn weather conditions push in the other direction against the massif, affecting the region for about 60 days per year. These warm, dry air masses stream from south to north and can result in unusually high temperatures in winter. Nevertheless, frost dominates the picture on the Zugspitze with an average of 310 days per year.