Clouds and high humidity act as a blanket to hold in heat at night. If these are absent, the heat absorbed by the earth during the day quickly radiates back into space.
desert
The lack of clouds means that the desert will heat up quickly when the sun rises but will also cool down quickly when the sun goes down.
A desert will cool off much more quickly as there is little humidity or cloud cover that would hold in the heat of the day.
Most hot deserts quickly cool down at night because there is little humidity and cloud cover to hold in daytime heating. The heat radiates back into space and the desert become quite cool at night.
In most hot or temperate deserts it may be quite hot during the day but can cool off quickly at night, especially in the summer.
Both a desert and a swamp warm up in the daytime, not cool. They both cool at night with the desert cooling the fastest.
No, it is cooler in the desert at night but not 'winter cool.' Deserts experience a regular winter season, however.
Some deserts are naturally cool or even bitterly cold. The Patagonian Desert, Atacama Desert and Antarctica are examples of cold deserts. Other deserts are hot during the day but can become quite cool at night.
Bilbies keep cool in the desert via a number of special features. They have large ears for thermo regulation. Blood flows quickly into the thin tissue around the Bilby's ears, preventing them from getting too hot during the day and from losing body heat quickly at night. Bilbies also dig burrows enabling them to keep cool during the heat of the day, but warm on cold nights.
The desert has little humidity and rarely is cloudy. These two factors allow the desert to heat up rapidly during the day and cool off quickly at night. In other biomes humidity and clouds act as a blanket which slows down heating and cooling.
It is not necessarily high. The Gobi Desert is quite cold. Even the American southwest desert gets pretty chilly at night. And - believe it or not - part of Antarctica is a desert. It is the amount of precipitation that makes it a desert, not the temperature.
When sky is clear the heat from earth will radiate to space and cool the night air faster. If cloudy the heat radiated is reflected back from clouds and it does not get so cool