The average annual rainfall is 1,346 mm ( 53.0 in ) , with extremes of 2,500 mm ( 98.4 in ) or more in the mountainous northeast ( the windward side of the island ) and 500 mm ( 19.7 in ) in the southwestern valleys .
The average yearly rainfall is 1,346 mm , with extremes of 2,500 mm or more in the northeastern mountains and 500 mm in the southwestern valleys .