From Longman Dictionary of Contemporary Englishrainfallrain‧fall /ˈreɪnfɔːl $ -fɒːl/ noun [countable, uncountable] DNHEMthe 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.
Examples from the Corpus
rainfall• For a number of years after 1865, a long humid cycle brought uninterrupted above-average rainfall to the plains.• The teens and 1920s, in particular, were years of extraordinary and consistent rainfall.• In fact, many of the occasional desert rainfalls are very light and incapable of any serious erosion.• Although the increase in rainfall would aid irrigation, it would add to the problems of soil erosion and nutrient leaching.• Except in regions of very low rainfall April should be regarded as the safest month for sowing herbage seeds.• Below-normal rainfall has led to a major water shortage.• From remote rural areas came evidence of continuing decline because of increased acidity of rainfall.• We drove through pastures big enough to have their own rainfall pattern.• Most other areas in the county reported rainfall of a quarter-inch to a half-inch. 