The average precipitation of a grassland biome typically ranges from about 10 to 30 inches (25 to 75 centimeters) per year. This amount can vary significantly depending on the specific location and type of grassland.
Grasslands are categorized into different types, such as temperate grasslands and tropical savannas. Temperate grasslands, found in regions like the North American prairies, may receive around 20 to 30 inches of rainfall annually, often experiencing hot summers and cold winters. In contrast, tropical savannas, which are usually found in regions like Africa, often have precipitation between 10 to 20 inches, with distinct wet and dry seasons.
This relatively low amount of rainfall is what distinguishes grasslands from forests, which receive higher amounts of precipitation. The limited precipitation in grasslands supports a unique array of vegetation, primarily grasses, which are well adapted to withstand seasonal droughts.