What region stretches from Southern California across the desert southwest to portions of southern Texas?

The Hot-Arid Region is characterized by its dry climate with high temperatures and low precipitation. This region includes Southern California, the desert areas of the Southwest, and parts of southern Texas, which all exhibit these climatic conditions.

In this area, typical features include deserts, drought-resistant vegetation, and a lack of significant rainfall, particularly in the summer months. This climate significantly influences the design and programming of architecture in the region, impacting considerations such as cooling methods, water usage, and material selection to withstand the heat and aridity.

Other options do not accurately describe the climate of the mentioned area. The Hot-Humid Region is associated with high moisture levels and tropical climates, the Cool Region pertains to areas with cooler temperatures and distinct seasonal changes, and the Temperate Region indicates more moderate and varied climate conditions. Each of these characteristics diverges from the prevailing conditions found in Southern California to southern Texas, where the predominant climate is indeed hot and arid.