The mean annual precipitation is 2 to 10 inches, occurring as summer thunderstorms and gentle winter rain. The mean annual air temperature is 72 degrees F. Frost-free period is 250 to 325 days. These are the Carrizo , Denure , Momoli , Valencia and Wellton soils. Carrizo soils are sandy-skeletal and in upland drainageways. Denure soils have a cambic horizon and are on slightly higher terraces.
Momoli soils are loamy-skeletal and on slightly higher terraces.
Valencia soils are on slightly higher alluvial fans. Wellton soils are coarse-loamy, have argillic horizons and are on slightly higher terraces. These soils are used for livestock grazing, wildlife habitat and irrigated cropland. Vegetation is creosotebush, bursage, cacti, palo verde, and annual weeds and grasses. Irrigated crops are cotton and alfalfa.