An arid climate is defined by dry conditions, where rainfall is scarce and evaporation rates are high.

In an arid climate, dry conditions prevail, meaning there is very little rainfall throughout the year. These regions often experience extreme temperature variations, with hot days and cooler nights. The lack of sufficient moisture means that vegetation is limited, typically consisting of drought-resistant plants like cacti and shrubs. Examples of areas with arid climates include deserts such as the Sahara, the Arabian Desert, and parts of the southwestern United States. These dry conditions make arid climates distinct from regions with more rainfall or humidity.