Cape Town is the oldest city in South Africa. The other two capitals are located in Pretoria. Cape Town has a warm Mediterranean climate with mild, moderately wet winters and dry, warm summers. Winter months in the city average a maximum of 18.0 °C (64 °F) Total annual rainfall in the city averages 515 millimetres (20.3 in). Summer, which lasts from early December to March, is warm and dry with an average maximum of 26.0 °C (79 °F) and minimum of 16.0 °C (61 °F). The region can get uncomfortably hot when the Berg Wind, meaning "mountain wind", blows from the Karoo interior for a couple of weeks in February or early March. Cape Town International Airport serves both domestic and international flights. It is the second-largest airport in South Africa and serves as a major gateway for travellers to the Cape region. Golden Arrow Bus Services operates scheduled bus services throughout the Cape Town metropolitan area.