The definition of a desert is a place that gets fewer than 10 inches (250mm) a year, or where more water is lost to evaporation than falls as precipitation. Beyond that, there is a lot of variation. In some parts of the Atacama desert in South America, rain has never been recorded. The Southwestern U.S. gets more rainfall, almost 28cm a year.
Variations can be due to weather patterns (sometimes unusual, as we’ve been seeing some slight varieties lately) and also amount of aquifer depletion.
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