In May the weather is cold. May. It stops in December and in January the weather changes to hot. In the south during May to December the ground is covered with green grasses and a lot of trees and flood waters everywhere. The south is between two rivers, the White Nile and the Blue Nile. Both rivers flood the south during the rains from May to December.
Average temperatures are lower in the south than in the rest of the country.
Central Sudan consists largely of a grass covered plain.