The rainy season is from June through September, transforming much of the region from dusty brown to green. Because much of the population of Darfur is agricultural, the rains are vital. In normal years, a crop is ready to be harvested by November. Once harvested, the dry stalks may be fed to domestic livestock. In the far northern desert, years may pass between rainfall. In the far south, annual average rainfall is 700 mm and many trees remain green year-round.