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
Free convection cells are unable to form above the hot desert ground
The light-colored sand radiates heat very rapidly at night
The ozone content of desert air is very low

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Environmental Science
The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that:

The sun's energy is less intense in the Southern Hemisphere
The earth is closer to the sun in January
Over 80% of the Southern Hemisphere is covered with water
The earth is farther from the sun in July

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