List the four climate regions is west Africa from the least rainfall to the most rainfall?

The four climate regions in West Africa, from least to most rainfall, are the desert climate, the semi-arid or savanna climate, the tropical wet and dry climate, and the tropical rainforest climate. The desert climate, found in areas like the Sahara, receives minimal rainfall. The semi-arid regions experience slightly more precipitation, while the tropical wet and dry climate sees seasonal variations with significant rainfall. Finally, the tropical rainforest climate, primarily located near the coast and in forested areas, receives the highest amounts of rainfall throughout the year.