When we think about deserts we think about dry hot places. Deserts however are areas of barren landscapes that receive little precipitation that can be hot or cold.
About one-third of the land surface of the Earth is arid or semi-arid.
The largest desert in the world is actually Antarctica.
Most deserts actually experience wild temperature swings in warmer climates. Since the air is dry, the heat obtained during the day escapes quickly at night.
The daytime temperature can average around 40°C while in some deserts it can get down to near freezing at night. The temperature also varies greatly depending on the location of the desert according to NASA.