rainfall
[U] Uncountable
This term carries a technical and statistical weight, often appearing in meteorological reports or geographic descriptions. It shifts the focus from the act of raining to the measurable quantity of water accumulated on the ground. While rain describes the active weather event, rainfall describes the result or the data. It is the preferred term for scientific discussions regarding climate patterns, agriculture, and environmental impact.
Used to describe the general phenomenon or total volume of precipitation, such as measuring the rainfall in a valley.