Apaikwa Rainfall At Apaikwa in Guyana, for a period of record spanning 1979 – 2012 average annual rainfall sum = 2828.2 mm wettest year on record = 4408.5 mm of rainfall in 2008 driest year on record = 748.8 mm of rainfall in 1987 wettest month on average = 351.4 mm of rainfall in June wettest …