Except during the rainy season most deserts have very low relative humidity.
That is generally correct.
Desert, extreme fluxuations in temperature along with low humidity and little rain.
Antarctica is an icy desert. It is the driest continent on earth with about five percent humidity.
A desert cools much more repidly than a swamp because there is little humidity to help hold the heat.
Since there is little humidity and rain in a desert, metal items oxidize (rust) at a much slower rate than in more humid areas.
Desert implies a lack of humidity. Antarctica experiences less than five percent humidity, which makes it a desert.
A desert usually has little cloud cover and high humidity that would hold in day time heating. Therefore, the desert cools quite quickly when the sun sets.
The river basin would generally be more humid.
A desert will cool off much more quickly as there is little humidity or cloud cover that would hold in the heat of the day.
Africa has a lot of desert, but you couldn't really say that it is virtually all desert. Its two main deserts are the Sahara and the Kalahari.
It is not necessarily high. The Gobi Desert is quite cold. Even the American southwest desert gets pretty chilly at night. And - believe it or not - part of Antarctica is a desert. It is the amount of precipitation that makes it a desert, not the temperature.
Of the seven continents the only two close to being "mostly desert", with the definition of desert as an area of limited rainfall and, hence, little vegetation, are Australasia and Antarctica.