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.~ Site Type: Rangeland MLRA: 67B -Central High Plains, Southern Part United States Department of Agriculture Natural Resources Conservation ervice Ecological Site Description Site Type: Rangeland Site Name: Gravel Breaks Site ID: R067BY063CO Major Land Resource Area: 67B -Central High Plains, Southern Part Physiographic Features This site occurs on nearly level to steep hills. Landform: alluvial fans, hills Aspect: N/A Minimum Maximum Elevation (feet): 3800 5600 Slope (percent): 1 45 Water Table Depth (inches): 60 60 Flooding: Frequency: none none Duration: none none Ponding: Depth (inches): 0 0 Frequency: none none Duration: none none Runoff Class: very low low Gravel Breaks R067BY063CO Climatic Features The mean average annual precipitation varies from 12 to 16 inches per y ar depending on location and ranges from less than 8 inches to over 20 inches per year. Approxim tely 75 percent of the annual precipitation occurs during the growing season from mid-April to I e-September. Snowfall can vary greatly from year to year but averages 35 to 45 inches per year. Wi ds are estimated to average about 9 miles per hour annually, ranging from 10 miles per hour during th 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 er hour. The average length of the growing season is 142 days, but varies from 1~ date of first frost in the fall is September 28, and the last frost in the sprint hottest month and December and January are the coldest. It is not uncor exceed 100 degrees F during the summer. Summer humidity is low and e winters are characterized with frequent northerly winds, producing severe dropping to -35 degrees F or lower. Technical Guide Section IIE a to 154 days. The average is about May 9. July is the Amon for the temperature to vaporation is high. The cold with temperatures USDA NRCS Rev. 3/04