According to Guinness World Records, the coldest desert on Earth is the McMurdo Dry Valleys in Antarctica. The average temperature is minus 4 degrees Fahrenheit.
Though not the traditionally imagined desert of sand, Antarctica is still a desert. There is very little precipitation, which is the standard for the definition of the word "desert." Temperatures are always low, but the coasts are somewhat warmer than the continent's interior. Because of the angle of the Earth in relation to the sun, Antarctica has full sun 24 hours a day during its summer months. In winter, the continent receives no sunlight at all.