Question

What causes temperature extremes in deserts?

Answer 1

It is because there is no rainfall or very less rainfall in the due geological climatic conditions

Answer 2

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HERE'S THE ANSWER ✌

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{Cause of extreme temperature in desert}

Deserts occur where there is a lack of moisture and thus an abundance of sunlight. With the relative lack in moisture, there is less evaporation. There are also less clouds to reflect the sunlight away.
With no evaporative cooling and a relative lack of vegetation to use the sunlight, most all of the sunlight goes into warming the ground surface. This causes very hot afternoon temperatures.
The largest deserts occur where global high pressure systems persist. Between the equator and the mid-latitudes is where these subtropical high pressure systems persist. The lack of storm systems and clouds helps warm the ground.

Deserts also tend to occur in lower elevation regions surrounded by higher elevations. As air sinks over a mountain or higher terrain, it warms adiabatically.
This warming adds to the already warm and dry conditions found at a. desert. The sinking air compresses and warms. The subtropical high contributes to sinking air while local impacts such as air flow down from high to low elevations compresses the air even more. Sinking air also dries the air (decreases relative humidity).
This contributes to less clouds and precipitation. The dry air reinforces the already sparse vegetation and dry soil.

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