With no moisture in the air to provide cloud cover during the day, desert terrain is under the merciless glare of the sun and heats up rapidly. The seasons are generally warm throughout the year but get a lot hotter during the summer. Because of the lack of humidity in the area, the ground receives more than twice the radiation heat from the sun during the day and loses twice as much heat during the night in comparison to more humid environments. Deserts are cold during the night because of the sand. Because sand cannot hold heat, it needs a constant source of energy to stay warm (The Sun). So during the night when the sun is not shining the sand loses all its heat, making the desert night cold.
Picture Credit : Google
