Sudan
Sudan, the largest nation in Africa, is a very arid country in the north, and much moister to the south. It ranges from the Sahara/Nubian Deserts along the border with Egypt and Libya, to some swampy rain forests along the southern border with Uganda. By and large, the nation is dry in the middle as well. The southernmost reaches of Sudan have a 9 month rainy season from April to December. The rainy season is shorter as one works to the north as the ITCZ and flow from the Bight of Guinea work their way north into central and a little bit of northern Sudan, before fading back south again in the winter. The whole country is hot year round, with it being a dry heat in the north, and more humid to the south.
The Sudan Meteorological Authority is the governing body for any Sudanese meteorological related questions you might have. Their site is entirely in Arabic, however, so I can't provide any further guidance beyond that.