Under the Köppen climate classification, Alice Springs has a subtropical hot desert climate ("BWh"), featuring extremely hot, dry summers and short, mild winters. Located just south of the Tropic of Capricorn, the town of Alice Springs straddles the usually dry Todd River on the northern side of the MacDonnell Ranges. Alice Springs is located in Central Australia, also called the Red Centre, an arid environment consisting of several different deserts. The annual average rainfall is which would make it a semi-arid climate except that its high evapotranspiration, or its aridity, makes it a desert climate.