Environmental Science
In most areas, the warmest time of the day about 5 feet above the ground occurs:

In the early evening after 6 PM
Just before the sun sets
In the afternoon between 3 and 5 PM
Around noon

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

Dry air is a very poor heat conductor
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

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