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

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

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Time of minimum temperature and the time of maximum solar radiation
Sunrise and sunset
Minimum and maximum solar energy received at the surface for a given day
Minimum and maximum temperature for a day
Time of maximum solar radiation and the time of maximum temperature

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