There are three types of desert climates in the Köppen climate classification: a hot desert climate (BWh), a cold desert climate (BWk) and a mild desert climate (BWh/BWn). Hot deserts have very hot summers that have temperatures that can even reach 45 °C (113 °F). Temperatures can even be very warm during winter. Cold deserts can have hot summers as well, but the winters are usually very cold. They are usually at high altitudes and can be drier than hot deserts.