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Tropical rainforest climate

The Köppen classification identifies tropical rainforest climates (Zone Af: f = "feucht", German for moist) as usually having north and south latitudinal ranges of just 5-10 degrees from the equator. Tropical rainforest climates have high temperatures: the yearly average temperature is normally between 21 and 30 °C (70 and 86 °F). The precipitation can reach over 100 inches a year. The seasons are evenly distributed throughout the year, and there is almost no drought period here. Regions that contain tropical rainforest climate mainly include the upper Amazon basin of South America, the Northern Zaire (Congo) basin of Africa, and the islands of the East Indies.

The tropical rainforest climate differs from other subtypes of tropical climates as it has more kinds of trees due to its precipitation. The large number of trees contribute back to the humidity of the climate because of the transpiration, which is the process of water evaporated from the surface of living plants to the atmosphere. The warmth and abundant precipitation heavily contributes to the diversity and characteristics of vegetations under the tropical rainforest climate. The vegetations develop a vertical stratification and various growth forms to receive enough sunlight, which is unusual under other types of climate.