AP BIOLOGY

Detailed explanation-1: -Desert humidity is usually so low that not enough water vapor exists to form clouds. The sun’s rays beat down through cloudless skies and bake the land.

Detailed explanation-2: -Desert air, with a large separation between air temperature and dew point, has a lower relative humidity, 21%. However, since dew point is a measure of the amount of water vapor in the air, the desert air must contain more water vapor.

Detailed explanation-3: -High temperatures keep the air warm and wet, with an average humidity of between 77% and 88%. Such humid air produces extreme and frequent rainfall, ranging between 200-1000 centimeters (80-400 inches) per year.

Detailed explanation-4: -If you are near the sea, the humidity is still usually fairly low in hot deserts, because the sea is relatively cold (the land is very hot during the day) and air blowing from the sea heats up and humidity decreases. It is unlikely you will get a dry area year round if the sea nearby is warm.