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

There is little water vapor in the air to absorb and re-radiate infrared radiation
Dry air is a very poor heat conductor
The light-colored sand radiates heat very rapidly at night
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
During the winter solstice in the Northern Hemisphere:

The noon sun is overhead at 23.5o S latitude
Astronomical winter begins in the Northern Hemisphere
All of these
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year

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