Environmental Science
An important reason for the large daily temperature range over deserts is:

Dry air is a very poor heat conductor
The light-colored sand radiates heat very rapidly at night
There is little water vapor in the air to absorb and re-radiate infrared radiation
The ozone content of desert air is very low
Free convection cells are unable to form above the hot desert ground

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Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The clouds start convection currents between them
The clouds absorb and radiate infrared energy back to earth
The water droplets in the clouds reflect infrared energy back to earth
The formation of the clouds releases latent heat energy
The clouds are better conductors of heat than is the clear night air

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