snowfall
n
1 [C] fall of snow on one occasion (一次的)降雪
There was a heavy snowfall last week. 上星期下了一场大雪.
2 [U] amount of snow that falls in a period of time (eg one winter or one year) in a certain place 某地一段时期(如一冬或一年)的降雪量
The average snowfall here is 10cm a year. 这里年平均降雪量为10厘米.