The Alps serve as a watershed for Europe's three major kinds of weather systems that influence Austrian weather. The Atlantic maritime climate from the northwest is characterized by low-pressure fronts, mild air from the Gulf Stream, and precipitation. It has the greatest influence on the northern slopes of the Alps, the Northern Alpine Foreland, and the Danube valley. The continental climate is characterized by low pressure fronts with precipitation in summer and high pressure systems with cold and dry air in winter. It affects mainly eastern Austria. Mediterranean high-pressure systems from the south are characterized by few clouds and warm air, and they influence the weather of the southern slopes of the Alps and that of the Southeastern Alpine Foreland, making them the most temperate part of Austria.