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This occurs because the air of deserts, with its very low humidity, cannot retain the heat received during the day. Normally, water vapor suspended in the atmosphere acts as a kind of thermos, accumulating heat for the night. As desert air is very dry, virtually all thermal energy is lost after sunset. Furthermore, sand only absorbs heat in a very thin layer, which makes the ground cool in a very short time. This is how, with nightfall, without any heat reserve, the temperature can plummet from a torrid 40 degrees to a Siberian minus 10.