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Sits Tyr. Rangeland <br />MI.R.A: 6~J - Uphcr Arkansas Valley Rolling Plains <br />United States Department of Agriculture <br />Natural Resources Conservation Service <br />Ecological Site Description <br />Site Type: Rangeland <br />Site Name: Loamy <br />Site ID: R069XY006C0 <br />Major Land Resource Area: 69 -Upper Arkansas Valley <br />Rolling Plains <br />Physiographic Features <br />This site occurs on nearly level to gently sloping plains. <br />Landform: plain, fan, terrace Aspect: N/A <br /> Minimum Maximum <br />Elevation (feet): 3600 5600 <br />Slope (percent): 0 10 <br />Water Table Depth (inches): 40 60 <br />Flooding: <br />Frequency: none rare <br />Duration: none very brief <br />Ponding: <br />Depth (inches): 0 0 <br />Frequency: none none <br />Duration: none none <br />Runoff Class: very low high <br />I,uam~ <br />Climatic Features <br />The mean average annual precipitation varies from 10 to 14 inches per year depending on location <br />and ranges from 5 inches to over 24 inches per year. Approximately 75 percent of the annual <br />precipitation occurs during the growing season from mid-April to late-September. Snowfall can vary <br />greatly from year to year and can range from 20 to 40 inches per year. Winds are estimated to <br />average about 6 to 7 miles per hour annually. Daytime winds are generally stronger than nighttime <br />and occasional strong storms may bring brief periods of high winds with gusts to more than 60 miles <br />per hour. <br />The average length of the growing season is 155 days, but varies from 147 to 162 days. The average <br />date of first frost in the fall is October 10, and the last frost in the spring is about May 5. July is the <br />hottest month and January is the coldest. It is not uncommon for the temperature to exceed 100 <br />degrees F during the summer. Summer humidity is low and evaporation is high. The winters are <br />characterized with frequent northerly winds, producing severe cold with temperatures dropping to as <br />low as -35 degrees F. <br />I ~tihnical GuiJc l ~til)A NR('S <br />New Mexico I Oklahoma <br />