St. Laurent Rainfall At St Laurent in French Guiana, for a period of record spanning 1971 – 2014 average annual rainfall sum = 2545.5 mm wettest year on record = 3489.7 mm of rainfall in 1976 driest year on record = 1959.7 mm of rainfall in 1992 wettest month on average = 375.3 mm of rainfall … Continue reading St. Laurent Rainfall