The mean annual precipitation is 3 to 5 inches, most of the moisture falls as rain in the winter with a few inches occasionally as snow. The frost-free season is 200 to 255 days. These are the competing Hi Vista soils and the Cajon soils. Cajon soils are very deep sandy soils that formed in alluvium on alluvial fans. Vista soils are moderately deep to a lithic contact on hills and pediments.
Native vegetation is sparse stands of creosotebush, yucca species, annual grasses and forbs.
The soils are moderately extensive. San Bernardino County, California, Mojave River Area, 1978. The soil has significant clay increases from the A horizon to the Bt horizon but does not qualify for the pale subgroups. Runoff changed from medium to rapid to high to very high.