The nighttime temperatures in the Sahara Desert range from 60 F to 70 F during the height of the summer down to sub-freezing temperatures from December into February. The temperature difference in the Sahara Desert from the high point during the day to the low point at night is as great as 70 F during certain times of the year.
The Sahara Desert is considered one of the harshest climates on the planet, due to its variable high temperatures during the day and the rapid and sometimes significant cooling in the night. The Sahara is the largest desert on the planet. The existing arid state of the Sahara has been a feature of the desert since approximately 3000 B.C.E.