The most common climate in the Southwest United States is Arid and semi-arid.

The Southwest region is characterized by dry, arid conditions, with hot summers and mild winters. Areas like Arizona, New Mexico, and parts of Texas and California experience desert-like climates with limited rainfall. Semi-arid conditions are common in higher elevations and valleys, where temperatures can vary. This climate type supports deserts, grasslands, and scrublands, making the region ideal for specific types of vegetation and wildlife adapted to these dry conditions.