The mean annual temperature ranges from 64 to 70 degrees F. and mean annual precipitation ranges from 28 to 40 inches. Frost free days range from 220 to 275 days and elevation ranges from 20 to 1,400 feet. The Thornthwaite annual P-E indices from 42 to 64. These include the competing Frio , Gowen , and Venus series. Also associated are Bunyan and Lewisville series.
Bunyan soils lack mollic epipedons.
Permeability is moderate. Runoff is negligible. The soil floods at 1 to 10 year intervals, except where protected by dikes or dams. Most areas are being farmed to sorghums, small grains, and pecan orchards. Some areas are used for bermudagrass pastures.