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Site Type: Rangeland MLRA: 69 -Upper Arkansas Valley Rolling Plains United States Department of Agriculture Natural Resources Conservation Service Ecological Site Description Site Type: Rangeland Site Name: Sandy Site ID: R069XY026CO Major Land Resource Area: 69 -Upper Arkansas Valley Rolling Plains Physiographic Features This site occurs on gently sloping to moderately sloping uplands and plains. Landform: hill, plain, ridge, fan Aspect: N/A Minimum Maximum Elevation (feet): 3600 6500 Slope (percent): 1 12 Water Table Depth (inches): 60 60 Flooding: Frequency: none rare Duration: none none Ponding: Depth (inches): 0 0 Frequency: none none Duration: none none Runoff Class: slow medium Sandy R069XY026CO Climatic Features The mean average annual precipitation varies from 10 to 14 inches per year depending on location and ranges from 5 inches to over 24 inches per year. Approximately 75 percent of the annual precipitation occurs during the growing season from mid-April to late-September. Snowfall can vary greatly from year to year and can range from 20 to 40 inches per year. Winds are estimated to average about 6 to 7 miles per hour annually. Daytime winds are generally stronger than nighttime and occasional strong storms may bring brief periods of high winds with gusts to more than 60 miles per hour. The average length of the growing season is 155 days, but varies from 147 to 162 days. The average date of first frost in the fall is October 10, and the last frost in the spring is about May 5. July is the hottest month and January is the coldest. It is not uncommon for the temperature to exceed 100 degrees F during the summer. Summer humidity is low and evaporation is high. The winters are characterized with frequent northerly winds, producing severe cold with temperatures dropping to as low as -35 degrees F. Technical Guide USDA NRCS Section IIE Rev. 3/04