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Table 1. Climatic trends at four locations along the lower Colorado River. Summer data are for June 1 <br />through August 30 and winter data are for December 1 to February 28. Temperatures are oC. Data from Sellers <br />and Hill (1974), Arizona Climate 1931-1972. <br />Precipitation Relative humidity <br />Summer Winter Record <br />extremea Total cm Days >0.25 cm May-Sep Oct-Apr <br />Elev. Avg. Avg. Avg. Avg. <br />Station (m) high low high low High Low May-Sep Oct-Apr May-Sep Oct-Apr 0600 1800 0600 1800 <br />Davis Dam 200 41 24 18 6 49 -6 3.10 7.54 3 10 24 15 37 26 <br />Parker 130 41 24 21 4 51 -10 2.95 6.76 4 9 25 18 36 25 <br />Ehrenberg 98 41 23 21 4 50 -8 3.23 5.74 4 8 34 16 39 22 <br />Yuma Valley 37 40 21 21 3 48 -10 1.93 4.60 3 8 56 22 52 28 <br />co <br />aTotal days <br />>32 <br />oC: Davis Dam - <br />165; <br />Parker <br />- 184; <br />Ehrenberg <br />- 180; <br />Yuma Valley <br />- 180. <br />Total <br />days <0 <br />oC: <br />Davis Dam - 5; Parker - 19; Ehrenberg - 14; Yuma Va lley - 18. <br />