South Sudan experiences a tropical climate. Temperature averages are normally above 25°C, with highs exceeding 35°C, particularly during the dry season (January to April). Juba, the capital city, has an average annual high temperature of 34.5°C and an average annual low of 21.6°C. The rainy season differs by location, but it generally occurs between April and November. The lowland areas of Eastern Equatoria, Jonglei, the Upper Nile and Bahr el Ghazal receive annual rainfall between 700 and 1,300 mm. The southeastern tip of Eastern Equatoria receives about 200 mm. The heaviest rainfall occurs in the southern upland areas and lessens towards the north. Western Equatoria and highland parts of Eastern Equatoria receive between 1,200 and 2,200 mm of rainfall annually. Precipitation in South Sudan is impacted by the movement of the Inter-Tropical Convergence Zone (ITCZ).
- Mean annual temperature has increased by 1.3°C per century for the period 1951-2000.
- Mean annual precipitation has decreased by 41 mm per month per century for the period 1951-2000.