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There is no minimum amount as some deserts go centuries with no measurable rainfall. The maximum is 10 inches (250 mm). More than 10 inches average in a year moves the region into the steppe climate.

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9y ago
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9y ago

Less than 10 inches (250 mm) of rain on average per year is a definition of the desert.

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Some deserts, such as the Atacama, have gone for years without a drop of rain.

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To be considered as a desert a region must receive less than 10 inches (250 mm) of rain per year on average.

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Q: What us the minimum amount of rainfall a desert can have?
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