Is ten millimetres of rain a lot?

Answer 1

It depends on the context. Ten millimeters in a day or a single rainfall event is a fairly substantial amount. Ten millimeters in an hour would be heavy rainfall event. An area that gets ten millimeters a year would be considered extreme desert

Answer 2

Ten millimeters of rain would be considered a relatively small amount of rainfall. It is equivalent to 0.39 inches. In some regions, this amount might not even be enough to cover the ground completely.