The climate is hot, arid continental. Average annual precipitation is 4 to 10 inches. Mean annual temperature is 67 to 75 degrees F. Frost-free period is about 240 to 350 days. These are the Gadsden , Marana , Pimer and Sasco soils. Gadsden, Glenbar and Pimer soils are on floodplains and lack contrasting textures.
Sasco soils are on adjacent terraces and are fine-silty.
Slow or very slow runoff. Used for limited grazing following seasonal rains. When irrigated, used for growing cultivated crops such as alfalfa, cotton and small grains. Native vegetation is mesquite, creosotebush, desertbroom, annual weeds and grasses. The series is moderately extensive.