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U. S. Fish and Wildlife Service - 04/89 <br />Colorado River at <br />Professor Valley <br />Temperature, Water (Deg. C) Calendar Year 1987 <br /> July August September October November December <br />Day Min Max Avg Min Max Avg Min Max Avg Min Max Avg Min Max Avg Min Max Avg <br />1 18.5 21.0 19.8 21.0 23.0 22.1 18.5 22.0 20.3 14.0 16.5 15.4 ---- ---- ---- ---- ---- ---- <br />2 19.5 21.5 20.6 21.0 24.5 22.6 19.0 22.0 20.8 13.5 16.0 15.0 ---- ---- ---- ---- ---- ---- <br />3 19.0 21.5 20.3 22.5 25.0 23.5 19.0 22.5 20.8 13.5 16.0 14.9 ---- ---- ---- ---- ---- ---- <br />4 19.0 21.5 20.3 22.5 25.0 23.8 18.5 21.5 20.3 13.5 16.0 14.9 ---- ---- ---- ---- ---- ---- <br />5 19.0 21.5 20.3 22.5 24.5 23.5 18.0 20.5 19.6 13.0 15.5 14.5 ---- ---- ---- ---- ---- ---- <br />6 19.0 21.0 20.1 22.5 24.5 23.4 17.5 20.5 19.2 13.0 16.0 14.6 ---- ---- ---- ---- ---- ---- <br />7 19.0 22.0 20.5 22.0 24.5 23.3 18.0 20.5 19.3 13.5 16.0 14.7 ---- ---- ---- ---- ---- ---- <br />8 19.5 22.0 20.8 22.0 24.5 23.3 17.0 20.0 18.8 13.5 16.0 14.8 ---- ---- ---- ---- ---- ---- <br />9 19.5 22.0 20.8 22.5 24.5 23.3 17.0 20.0 18.7 13.0 15.5 14,5 ---- ---- ---- ---- ---- ---- <br />10 19.0 21.0 20.0 22.0 24.0 22.9 16.5 19.5 18.3 13.0 15.0 14.3 ---- ---- ----, ---- ---- ---- <br />it 19.0 21.0 19.8 22.0 24.0 22.8 16.0 20.0 18.3 13.0 15.0 14,2 ---- ---- ---- ---- ---- ---- <br />12 18.0 21.0 19.7 22.0 24.0 23.1 16.5 19.0 18.0 13.0 14.5 13.9 ---- ---- ---- ---- ---- ---- <br />13 18.5 22.5 20.8 22.0 23.5 22.7 16.0 17.5 17.0 13.5 14.0 13.8 ---- ---- ---- ---- ---- ---- <br />14 19.5 23.5 21.6 21.0 22.0 21.6 15.0 17.0 16.2 13.0 14.0 13.4 ---- ---- ---- ---- ---- ---- <br />15 21.0 24.0 22.3 19.0 20.5 19.9 14.0 17.0 15.8 12.5 13.5 13.0 ---- ---- ---- ---- ---- ---- <br />16 21.5 23.5 22.4 18.0 21.5 19.8 14.5 17.5 16.3 12.0 14.0 13.0 ---- ---- ---- ---- ---- ---- <br />17 21.0 22.0 21.4 18.5 21.5 20.2 15.0 18.0 16.8 11.5 13.5 12.5 ---- ---- ---- ---- ---- ---- <br />18 20.0 21.5 20.7 19.0 22.0 20.7 15.0 18.0 16.8 11.5 13.0 42.3 ---- ---- ---- ---- ---- ---- <br />19 19.0 21.0 20.1 19.0 22.0 20.8 15.0 18.0 16.6 11.0 12.5 11.8 ---- ---- ---- ---- ---- ---- <br />20 18.5 19.5 19.2 20.0 21.0 20.5 14.5 17.5 16.3 10.5 12.0 11,3 ---- ---- ---- ---- ---- ---- <br />21 18.5 20.5 19.3 19,5 22.0 21.0 14.5 18.0 16.5 10.0 11.5 10.7 ---- ---- ---- ---- ---- ---- <br />22 19.0 22.0 20.3 20.0 22.5 21.4 15.0 18.0 16.7 9.5 11.0 10.4 ---- ---- ---- ---- ---- ---- <br />23 19.5 23.0 21.1 20.5 21.5 20.9 15.0 18.0 16.6 9.5 11.0 10.3 ---- ---- ---- ---- ---- ---- <br />24 20.0 23.5 21.7 20.5 21.5 20.8 15.0 17.5 16.4 10.0 11.0 10.5 ---- ---- ---- ---- ---- ---- <br />25 21.0 24.0 22.7 18.0 20.0 19.0 16.0 18.0 17.0 10.0 11.5 10.8 ---- ---- ---- ---- ---- ---- <br />26 22.0 24.5 23.2 17.0 19.0 18.0 16.0 18.0 17.2 10.0 12.0 11.1 ---- ---- ---- ---- ---- ---- <br />27 22.0 25.0 23.6 ---- ---- ---- 16.5 18.5 17.6 10.5 12.5 11.5 ---- ---- ---- ---- ---- ---- <br />28 22.0 25.0 23.7 17.0 19.0 18.1 16.0 18.0 17.0 11.0 12.0 11.5 ---- ---- ---- ---- ---- ---- <br />29 23.0 24.0 23.6 17.5 20.0 18.8 15.0 17.5 16.3 11.0 11.5 11.3 ---- ---- ---- ---- ---- ---- <br />30 22.5 24.0 22.9 18.0 21.0 19.5 14.5 17.0 15.8 11.0 12.0 11.3 ---- ---- ---- ---- ---- ---- <br />31 22.0 23.0 22.3 18.0 21.5 19.7 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- <br />MONTH 18.0 25.0 21.2 ---- ---- ---- 14.0 22.5 17.7 ---- ---- ---- ---- ---- ---- ---- ---- ---- <br />2 <br />M