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EXHIBIT "K" 6.4.11 Climate: The mean average annual precipitation varies from 10 to 14 inches per year depending on location and ranges from 5 inches to over 24 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 and can range from 20 to 40 inches per year. Winds are estimated to average about 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 growing season is 155 days, but varies from 147 to 162 days. The average date of first frost in the fall is October 10, and the last frost in the spring is about May 5. July is the hottest month and January is 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 as low as -35 degrees F. Minimum Maximum Frost-free period (days): 147 162 Freeze-free period (days): 169 186 Mean Annual Precipitation (inches): 10 14 Average Monthly Precipitation (inches) and Temperature (OF): Preci . Min. Preci . Max Temp. Min. Temp. Max. January 0.28 0.27 12.1 46.4 February 0.14 0.36 15.3 52.9 March 0.25 0.68 20.7 61.5 April 0.73 1.16 28.9 71.8 May 0.90 2.21 38.6 81.1 June 0.83 1.79 47.6 91.4 July 2.34 2.38 53.4 96.2 August 1.62 2.00 51.7 93.7 September 1.04 1.12 43.3 86.0 October 0.90 0.78 32.2 74.2 November 0.49 0.51 21.0 58.1 December 0.43 0.27 14.1 48.6 Climate Stations Period Station ID Location or Name From To CO6763 Pueblo Army Depot 1971 2000 CO3828 Haswell 1922 2001 CO7287 Rush 1924 2001 CO4834 Las Animas 1930 2001 59