This document discusses the climate and topography of Africa. It notes that over 50% of Africa has inadequate precipitation and 92% experiences climatic contrasts with shortage of water in some areas and oversupply in others. About 8% has a tropical climate with rainfall 10-12 months per year. Africa has about one-third of the world's arid lands and temperature variations are not excessive, though lower plains and desert regions experience great heat. The most important climatic differences are due to rainfall variations.