The phrase "normal rainfall" refers to the average amount of rain that falls in a particular area over a period of time, usually a year. It indicates the expected or typical amount of rain for that location.
Sentences with «normal rainfall»
Overall, the region is expected to receive near normal with a tendency to above normal rainfall during this season. (unma.go.ug)
Overall, there are high chances of near normal rainfall over this region. (unma.go.ug)
So it looks like there are equal chances for below normal, near normal or above normal rainfall, which I hope is good news. (climate.gov)