Simplify the following text for a Grade 7 native English-speaking person.
Original: Annual rainfall ranges from 430 millimetres ( 17 inches ) around Dalgety to 700 millimetres ( 26 inches ) at the eastern edge of the plateau , where occasional cyclonic storms can produce extremely heavy rainfall - in one day in June 1975 Nimmitabel received 256 millimetres ( over 10 inches ) of rain .
Simplified: Occasional storms can produce very heavy rainfall . In one day in June 1975 , Nimmitabel received 256 millimetres ( over 10 inches ) of rain .