Desert climate or Arid climate (in the Köppen climate classification: BWh "hot desert climate" and BWk "cold desert climate") is a type of climate where precipitation is generally less than a year. Low rainfall is a feature of deserts such as the Arabian, central Australia and the Sahara. It is a feature of continental interiors, the western sides of continents, and the leeward side of tall mountain ranges. Parts of the Arctic and Antarctic have arid climates even though they are cold.