For that indicator, FAO provides data for Guyana from 1962 to 2014. The average value for Guyana during that period was 2387 mm per year with a minumum of 2387 mm per year in 1962 and a maximum of 2387 mm per year in 1962.
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Definition: Average precipitation is the long-term average in depth (over space and time) of annual precipitation in the country. Precipitation is defined as any kind of water that falls from clouds as a liquid or a solid.