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Why is it often hot in deserts?

With little moisture in the air, less of the sun's radiation is absorbed on the way to Earth and the land (and anything on it) heats up. The flip side is that the land's heat escapes quickly back to space at night, causing large temperature swings from day to night. The converse is also true. Have you noticed that early mornings are warmer when the sky has been cloudy during the night? Also, this explains why nighttime temperatures are warmer during the monsoon summer, when the humidity is high in Tucson. For more information go to climate.