Between 50 to 260 inches (125 to 660 cm.) of rain falls yearly in any given rainforest worldwide. Average rainfall is usually more than 100 inches per year, however, for the forest to qualify as a rainforest. There is usually a brief season of less rain. In monsoonal areas, there is a real dry season.
The average amount of annual rainfall in a tropical rainforest is about 98.4 inches. They receive so much rain because they are hot and wet climates found close to the equator. Since tropical rainforests are so close to the equator they receive more direct constant sunlight than anywhere else. The sunlight causes water to evaporate and puts additional moisture in the air. About 50 percent of the rain that falls on rain forests is generated from its own evaporation.
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