Desert heat refers to the high temperatures experienced in desert regions, often exceeding 100°F (38°C) during the day. This extreme heat is caused by the lack of moisture in the air and the sun's direct rays, which can lead to rapid evaporation of water. Deserts, such as the Sahara and Mojave, are characterized by their arid conditions and minimal vegetation, which contribute to the intense heat. At night, desert temperatures can drop significantly, sometimes by as much as 50°F (28°C). This drastic temperature change occurs because the dry air cannot retain heat. The unique climate of deserts affects local wildlife and plant life, which have adapted to survive in such harsh conditions, including species like the cactus and the fennec fox.