Rainfall n. : A fall or descent of rain; the water, or amount of water, that falls in rain; as, the average annual rainfall of a region.

Example:
What is the daily Rainfall and the yearly Rainfall of the desert?

Taxonomy
rain, raindrops, precipitation, precipitation rate, acid rain, Cherrapunji, weather, 2006-10-19, heavy rain, Chocó, Earth & Sky, free encyclopedia, Tutunendo, air resistance, Averages, 12-11, Australian Government, Government Bureau.

Defination from the web:
rainfall can be harmful, even devastating to crops. ... Plants need varying amounts of rainfall to survive. ...