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.
© Commonwealth of Australia 2007, Bureau of Meteorology