CIMH Rainfall At CIMH in Barbados, for a period of record spanning 1971 – 2014 average annual rainfall sum = 1266.8 mm wettest year on record = 1790.9 mm of rainfall in 2010 driest year on record = 875 mm of rainfall in 2002 wettest month on average = 196.7 mm of rainfall in October wettest …