The Savanna biome has a wet/dry climate. Its Köppen climate group is Aw. The Astands for a tropical climate, and the wfor a dry season in the winter.
In the savanna climate there is a distinct dry season, which is in the winter. Savannas get all their rain in the summer months. During the distinct dry season of a savanna, most of the plants shrivel up and die. Some rivers and streams dry up. Most of the animals migrate to find food.
In the wet season all of the plants are lush and the rivers flow freely. The animals migrate back to graze. In West Africa the rainy season begins in May.
It is usually cooler during the dry season by a few degrees. Because it is in the tropical latitudes that is still hot enough. The savanna climate has a temperature range of 68° to 86° F (20° - 30° C). In the winter, it is usually about 68° to 78° F (20° - 25° C). In the summer the temperature ranges from 78° to 86° F (25° - 30° C). In a Savanna the temperature does not change a lot. When it does, its very gradual and not drastic.
There is an annual precipitation of 10 to 30 inches (100 to 150 cm) of rain. From December to February hardly any rain falls at all.
by Alex P. 2000
"Environment: Specials: Global Climate Map", http://www.fao.org/WAICENT/FAOINFO/SUSTDEV/EIdirect/climate/EIsp0066.htm (5 June 2000)
"Wet Dry Tropical Climate", http://www.uwsp.edu/acaddept/geog/faculty/ritter/geog101/climates_tropical_wetdry.html (1 June 2000)
"Savannas," Macmillan Encyclopedia of the Environment. 1997. Vol 5
National Geographic Society (U.S.), Atlas of the World 7th edition, Washington, D.C. 1999.