South Africa has a generally temperate climate because it is surrounded by the Atlantic and Indian Oceans on three sides, because it is located in the climatically milder Southern Hemisphere, and because its average elevation rises steadily toward the north (toward the equator) and further inland. This varied topography and oceanic influence result in a great variety of climatic zones. The climatic zones range from the extreme desert of the southern Namib in the farthest northwest to the lush subtropical climate in the east along the border with Mozambique and the Indian Ocean. Winters in South Africa occur between June and August.