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Evaporation: Average Monthly & Annual Evaporation

Evaporation is the amount of water which evaporates from an open pan called a Class A evaporation pan. The rate of evaporation depends on factors such as cloudiness, air temperature and wind speed. Measurements are made by the addition or subtraction of a known amount of water, which then tells us how much water has evaporated from the pan.

The evaporation data are also available in a gridded electronic format.

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Maps of average evaporation

 
   

Average annual evaporation

Detailed climatology map - Average Annual evaporation


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