Isabela Rainfall At Isabela in Puerto Rico, for a period of record spanning 1971 – 2014 average annual rainfall sum = 1597.4 mm wettest year on record = 2108.1 mm of rainfall in 2005 driest year on record = 1130.9 mm of rainfall in 1973 wettest month on average = 197.1 mm of rainfall in May … Continue reading Isabela Rainfall