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EXHIBIT "K" 6.4.11 Climate: Approximately 75%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 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 freeze-free period(28°F)is 168 days.The average last freeze in the spring is April 22nd and the average date 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 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 not uncommon for temperature to exceed 1001F 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-30'F.LRU A in the Arkansas River Valley, is the hottest and driest portion of the MLRA Mean Annual Precipitation(MAP)is 10-12 inches,and Mean Annual Air Temperature(MAAT)is 51 to 54°F.LRU B is the largest extent.MAP is 12-14 inches,and MART is 50-54°F.Southeastern Colorado was strongly affected by 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 exceptional drought conditions have re-visited the area from 2002 to 2012,with brief interludes of near normal to normal precipitation years. "During periods of drought,high winds give rise to the dust storms which are especially characteristic of the southeastern plains."1\Recent drought events have increased mortality of blue grams upwards of 80%in some locales.The long-term effects of these latest drought years have yet to be determined.Growth of native cool season plants begins about April 15 and continues to mid-June.Native wamr season plants begin growth about May 1 and continue to about August 15.Regrowth of cool season plants occurs in September and October in most years, depending on moisture.For detailed information visit the Western Regional Climate Center website at http:/hwvw.wroc.dri.edul 1‘Western Regional Climate Center>Climate of Colorado>Climale of the Eastern Plains:http:l/www.wrcc dri.edu/narratrvesicolorado/ Averaged Frost-free period(days) 149 Freeze-free period(days)• 168 Mean annual precipitation(inches): 13.20 Monthly Precipitation(Inches): Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 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 Medium 0.26 0.22 0.72 105 1.51 1.35 1.95 2.15 0.77 0.54 0.24 0.26 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 4 inn,- nares i --- _ fiches i t • inches _._•. � 4 0 inches i Jan .r,41 Mar Apr May Jun jai Aug Sep Oct Nov Dec 77