rain‧fall /ˈreɪnfɔːl $ -fɒːl/ noun [uncountable and countable]
the amount of rain that falls on an area in a particular period of time:
We’ve had a long period of low rainfall.
The city has received only half its average rainfall of four inches.

[TahlilGaran] Dictionary of Contemporary English ▲

rainfall
noun
ADJ. abundant, excessive, heavy, high There have been heavy rainfalls this month.
low | moderate | normal | good, poor We need a good rainfall to save the crops.
annual | average | local | summer, winter
VERB + RAINFALL have The area has a high annual rainfall.
measure Her work includes measuring the local rainfall.

[TahlilGaran] Collocations Dictionary ▲

rainfall
noun
BAD: There was no rainfall for over three months.
GOOD: There was no rain for over three months.
GOOD: It didn't rain for over three months.

Usage Note:
rainfall = the amount of rain that usually falls in an area during a certain period: 'The whole region has a very low rainfall at this time of the year.' Note that rainfall is mainly used in technical styles.

[TahlilGaran] Dictionary of Common Errors ▲