The coldest desert nights occur during the winter months, when the sun is at its lowest point in the sky. In some deserts, the temperature can drop below freezing at night, even in the summer.
The extreme temperature difference between day and night in deserts can be a challenge for plants and animals. Some plants and animals have adapted to the cold desert nights by developing thick fur or by burrowing underground. Others have adapted by becoming nocturnal, meaning they are active at night when the temperatures are cooler.
The extreme temperature differences in deserts also create some interesting weather phenomena. For example, the rapid cooling of the air at night can cause fog to form. This fog can be so dense that it can make it difficult to see. In some cases, the fog can even freeze, creating a beautiful display of ice crystals.