rainfall; amount of rain
Refers to the measured amount of rain over a period or in an area, often given in millimeters in weather reports.
Yesterday's rainfall exceeded fifty millimeters.
This region has a lot of rainfall in summer.
The rainfall was heavy this year.
The Meteorological Agency records rainfall at various locations.
The hourly rainfall reached 50 millimeters.
rain gauge
A Sino-Japanese compound of 雨, 'rain', and 量, 'amount' or 'quantity'; the spelling directly reflects the meaning 'amount of rain'.