There are primarily two seasons in Bolivia - the dry and the wet. The dry season is from May to October, the winter time months. The wet season is from November to April, the summer time months. It is coldest during the months of June to September and wettest from December to March. Although Bolivia lies entirely within the tropics, its varied elevation gives it a wide range of climate types. In the higher elevations, conditions are cold, dry, windy and bright. The atmosphere is thin, and the daily temperature can go from one extreme to the other. The climate is warmer in the lower-lying regions, with both lush and humid and dry kinds of heat – depending on the area.  Mean annual temperatures range from about 8°C (about 46°F) in the Altiplano to about 26°C (about 79°F) in the eastern lowlands.