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12/9/2019 ESD Printable Report <br /> Landforrn: (1)Stream terrace <br /> (2)Flood plain <br /> (3)Flood-plain step <br /> Minimum Maximum <br /> Elevation(feet): 3500 5800 <br /> Slope(percent): 0 2 <br /> Water table depth(inches): 0 40 <br /> Flooding <br /> Frequency: None Frequent <br /> Duration: Very brief Brief <br /> Ponding <br /> Depth(inches): 0 0 <br /> Frequency. None None <br /> Runoff class: Very low Very high <br /> Aspect: No Influence on this site <br /> Climatic Features <br /> Approximately 75%of the annual precipitation occurs during the growing season from mid-April to late September.Snowfall can vary greatly <br /> from year to year and can range from 20 to 40 inches per year.Winds are estimated to average 6 to 7 miles per hour annually.Daytime winds <br /> are generally stronger than nighttime and occasional strong storms may bring brief periods of high winds with gusts to more than 60 miles per <br /> hour.The average length of the freeze-free period(28°F)is 168 days.The average last freeze in the spring is April 22nd and the average date <br /> of first freeze(28°F or below)in the fall is October 7th.The average length of the frost-free period(32°F)is 149 days.The last frost in the <br /> spring is May 5th and the average date for first frost in the fall(32°F),is October 1.July is the hottest month and January is the coldest.It is <br /> not uncommon for temperature to exceed 100°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-30°F.LRU A in the Arkansas River Valley, <br /> is the hottest and driest portion of the MLRA.Mean Annual Precipitation(MAP)is 10-12 inches,and Mean Annual Air Temperature(MART)is <br /> 51 to 54°F.LRU B is the largest extent,MAP is 12-14 inches,and MAAT is 50-54°F.Southeastern Colorado was strongly affected by <br /> extended drought conditions in the"Dust Bowl"period of the 1930's,with recurrent drought cycles in the 1950's and 1970's.Extreme to <br /> exceptional drought conditions have re-visited the area from 2002 to 2012,with brief interludes of near normal to normal precipitation years. <br /> "During periods of drought,high winds give rise to the dust storms which are especially characteristic of the southeastern plains."1\Recent <br /> drought events have increased mortality of blue grama upwards of 80%in some locales.The long-term effects of these latest drought years <br /> have yet to be determined.Growth of native cool season plants begins about April 15 and continues to mid-June.Native warm season plants <br /> begin growth about May 1 and continue to about August 15.Regrowth of cool season plants occurs in September and October in most years, <br /> depending on moisture.For detailed information visit the Western Regional Climate Center website at http://www.wrcc.dri.edu/1\Western <br /> Regional Climate Center>Climate of Colorado>Climate of the Eastern Plains:http://www.wrcc.dri.edu/narratives/colorado/ <br /> Ave ggd <br /> Frost-free period(days): 149 <br /> Freeze-free period(days): 168 <br /> Mean annual precipitation(inches): 13.20 <br /> Monthly P�EpLt0Ii.40-.(LOSh es)_ <br /> Jan Feb Mar Air May Jun Jm1I Aug 5tR 9Q1 Nov De-c <br /> High 0.44 0.47 1.20 1.78 2.44 2.18 2.98 3.05 1.30 1.35 0.69 0.46 <br /> Medium 0.26 0.22 0.72 1.05 1.51 1.35 1.95 2.15 0.77 0.54 0.24 0.26 <br /> Low 0.09 0.09 0.42 0.49 0.74 0.83 0.99 1.23 0.43 0.20 0.09 0.15 <br /> 4 inches -- <br /> 3 inches - - <br /> 2 inches <br /> 1 inches __....-. .-._. <br /> 0 inches <br /> Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br /> Monthly Temperature(*F); <br /> Jan Feb Mar Air May Jinn Jud Aug 3gR QrA Nov Dr& <br /> High 46.1 49.5 58.8 67.5 76.8 87.1 92.7 89.8 82.1 69.9 56.2 45.6 <br /> https://esis.sc.egov.usda.gov/ESDReport/fsReportPrt.aspx?id=R069XY03OCO&rptLevel=all&approved=yes&repType=regular&scrns=&comm= 2/15 <br />