Isohyets are lines of constant precipitation rates. The closer a line is to another, the higher the increase in rainfall. Likewise, lines that are further apart do not have a dramatic change in their rainfall. The map shown here is of Australia's median annual rainfall in millimeters, issued by the country's Director of Meteorology in 1973. It shows that while the center of the country sees little to no rain at all, the coastlines typically see a lot of rain every year.
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