Why are daytime and nighttime temperatures so different in hot deserts?

In hot deserts, the significant difference between daytime and nighttime temperatures is primarily due to the lack of cloud cover and low atmospheric humidity.12

During the day, the absence of clouds allows high levels of solar radiation to reach and heat the ground directly, leading to extreme surface and air temperatures.12

At night, that same lack of cloud cover and moisture prevents the atmosphere from trapping heat. Because dry, cloudless air has a limited capacity to emit infrared radiation back toward the surface, the heat absorbed during the day escapes rapidly into the sky through long-wave radiation. This process causes temperatures to drop dramatically after sunset, often falling below the freezing point.12