Mean January temperature is 26 degrees F., mean July temperature is 66 degrees F., mean annual temperature is 47 degrees F., and average frost-free season is 100 to 125 days. These are the Clayton , Laketon , Narcisse , and Peone soils. Clayton and Narcisse soils have a coarse-loamy control section. Peone and Laketon soils are high in volcanic ash. Seasonal high water table.
Series is of small extent.
Spokane County, Washington, 1964. Diagnostic horizons and features recognized in this pedon are a mollic epipedon from the surface to 12 inches, a cambic horizon from 12 to 60 inches. Redoximorphic features of iron accumulation are present from 12 to 60 inches.