rainfall
英 [ˈreɪnfɔːl] 美 [ˈreɪnfɔːl]
n. 降雨量; 下雨
牛津词典
noun
降雨量;下雨
the total amount of rain that falls in a particular area in a particular amount of time; an occasion when rain fallsThere has been below average rainfall this month.
这个月的降雨低于平均降雨量。an average annual rainfall of 10 cm
10厘米的年平均降雨量