Geologists and climatologists classify deserts based on low precipitation levels, typically less than 250 millimeters (10 inches) annually. The Antarctic Polar Desert is the driest, with only 50 millimeters (2 inches) of precipitation per year, while the Arctic Polar Desert receives 100-200 millimeters (4-8 inches). Although polar deserts experience minimal evaporation due to freezing temperatures, their extremely low precipitation qualifies them as deserts. Resources like #NASA, the US Geological Survey (#USGS), and climate research organizations confirm this classification based on precipitation data.

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