The climate is subhumid with warm, dry summers and cool, moist winters. The average annual precipitation is 25 to 40 inches. These are the Millsholm , Skyhigh and Sleeper soils. Millsholm soils have a lithic contact at depths less than 20 inches and are loamy. Skyhigh and Sleeper soils have argillic horizons.
Vegetation is annual grasses and forbs and blue oaks.
The series is not extensive. Lake County, California 1983. It is assumed that the CaCO3 is greater than 15 percent. Series reclassified on September, 1994.