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Tropical savanna climate or tropical wet and dry climate is a tropical climate sub-type that corresponds to the Köppen climate classification categories Aw and As. The driest month has less than 60 mm of precipitation and also less than 100 − 25 ] {\textstyle 100-\left}{25}}\right]} mm of precipitation.
This latter fact is in a direct contrast to a tropical monsoon climate, whose driest month sees less than 60 mm of precipitation but has more than 100 − 25 ] {\textstyle 100-\left}{25}}\right]} of precipitation. In essence, a tropical savanna climate tends to either see less overall rainfall than a tropical monsoon climate or have more pronounced dry season.
In tropical savanna climates, the dry season can become severe, and often drought conditions prevail during the course of the year. Tropical savanna climates often feature tree-studded grasslands due to its dryness, rather than thick jungle. It is this widespread occurrence of tall, coarse grass which has led to Aw and As climates often being referred to as the tropical savanna. However, there is some doubt whether tropical grasslands are climatically induced. Additionally, pure savannas, without trees, are the exception rather than the rule.