2008-10-06_GENERAL DOCUMENTS - M2009002

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Site Type: Rangeland MLRA: 67B - Central High Plains, Southern Part Sandy R067BY024CO United States Department of Agriculture Natural Resources Conservation Service Ecological Site Description Wy?omin Site Type: Rangeland Site Name: Sandy Site ID: R067BY024CO Major Land Resource Area: 67B - Central High Plains, Southern Part Physiographic Features This site occurs on level to hilly uplands and plains. Landform: hill, plain Aspect: N/A Minimum Maximum Elevation (feet): 3800 5600 Slope (percent): 0 9 Water Table Depth (inches): 60 60 Flooding: Frequency: None None Duration: None None Ponding: Depth (inches): None None Frequency: None None Duration: None None Runoff Class: very low medium 67A1 676: rado 1., r Climatic Features The mean average annual precipitation varies from 12 to 16 inches per year depending on location and ranges.from less than 8 inches to over 20 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 but averages 35 to 45 inches per year. Winds are estimated to average about 9 miles per hour annually, ranging from 10 miles per hour during the spring to 9 miles per hour during late summer. Daytime winds are generally stronger than nighttime and occasional strong storms may bring periods of high winds with gusts to more than 90 miles per hour. The average length of the growing season is 142 days, but varies from 129 to 154 days. The average date of first frost in the fall is September 28 and the last frost in the spring is about May 9. July is the hottest month and December and January are 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 -35 degrees F or lower. Technical Guide USDA NRCS Section HE Rev. 3/04