Altiplano (highlands) – Lake Titicaca, La Paz, Oruro, Cochabamba, Sucre, Potosí and Uyuni. Climate varies from cool and humid to semi-arid. The average temperature ranges from 15 to 27°C (60 – 80ºF) with the coldest temperatures occurring in the south-western portion of the Altiplano during the months of June and July.