Grasslands have anaverage rainfall of 10 to 30 inches a year.§Grasslands also have a yearly drought as well.
Grasslands
Grasslands can receive 250-900 mm (9.8-35 in.) of rain per year.
Temperate grasslands are a division of a larger biome grouping of grasslands that includes tropical savannas. There is an average of 20 â?? 35 inches of rainfall a year in the temperate grasslands.
Grasslands generally receive about twice the annual precipitation of deserts.
Savannas and grasslands are generally considered as semiarid. They are dry but receive more rainfall than a desert.
Insufficient rainfall to support trees
The southwest U.S. receives too little rainfall to support grasslands while the southeast U.S. receives too much rainfall and supports deciduous forest rather than grasses.
Trees require more rainfall for growth than what is usually available in most grasslands.
The tropical rain-forest needs constant humidity and rain to survive and grasslands need periodic rainfall and sunshine to keep surviving. and the difference is the climate they are in.
Insufficient rainfall to support trees
more than deserts and less than forest