Depending on the particular desert and season of the year deserts may be:
hot and dry
cold and dry
cool and dry
Physical Weathering (aka Mechanical Weathering) is the main type of weathering in deserts.
There are hot subtropical deserts, there are cold winter deserts, this is a polar desert and there are cool coastal deserts. Each has its own specific climate data.
Stationary high-pressure cells
Both subpolar and subtropical deserts would be an example.
Deserts are located in areas that have pretty consistent weather. There are hot deserts and cold deserts because the temperature and climate are constant and almost unchanging.
There are two dozen major deserts in the world and each has its specific climate data. You need to specify a location.
The deserts of Egypt are classified as hot deserts.
Extreme weather
No, all deserts are not sandy. There are also rocky deserts.
Climate is the type of weather in an area. For example, rain forests have a hot, humid and moist climate while deserts have a hot and dry climate.
Russia has tundra but no true deserts.
Scorpions would be found in hot deserts.