Simplify the following text for a Grade 6 native English-speaking person.
Original: Rainfall is scant throughout the year , apart from the occasional thunderstorm , though in March 1949 and January 1974 the town received around 390 m or twice its average annual rainfall .
Simplified: There is little rainfall during the year . In March 1949 and January 1974 , the town received around 390 m or twice its average annual rainfall .