MBIA Rainfall At MBIA in Grenada, for a period of record spanning 1986 – 2014 average annual rainfall sum = 1557.6 mm wettest year on record = 1157.3 mm of rainfall in 1990 driest year on record = 744.9 mm of rainfall in 1994 wettest month on average = 160.9 mm of rainfall in November wettest …