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MAXIMUM <br />75TH PERCENTILE <br />MEDIAN <br />MEAN <br />25TH PERCENTILE <br />MINIMUM <br />39 NUMBER OF MEASUREMENTS <br />35 <br />30 <br />W <br />U <br />W 25 <br />0 <br />W <br />i 20 <br />W <br />15 <br />W <br />O. <br />W 10 <br />H <br />W <br />W <br />Q 5 <br />0 <br />SITE <br />N_ 1n n N N M 0 to <br />1M <br />LL LL LL LL LL LL LL LL LL <br />• <br />• <br />X 19 <br />p 2� 39 <br />17 86 112 �7 <br />Z <br />CC LL O_ <br />Q J <br />U <br />Er <br />ad Q <br />3a� <br />U <br />Z <br />ir F — J O <br />Lu!L a U a <br />j <br />O a J <br />U <br />9 12 15 18 2T 24 27 30 33 '36 39 42 45 48 5T 54 57 60 63 66 69 <br />APPROXIMATE MILES DOWNSTREAM FROM DRAINAGE BOUNDARY <br />Note: Period of record for individual sites <br />is variable. See tables 3 and 4. <br />Figure 10.-- Statistical summary of downstream variations in water <br />temperature for Fountain Creek, available data, 1975 -83. <br />Upstream from the confluence with Monument Creek, measurements of water <br />temperature at sites F12 and F15 ranged from 0 to about 25 ° C (fig. 10). <br />Monthly variations in water temperature measured at site F12 are shown in <br />figure 11. Coldest temperatures measured at this site have occurred during <br />December and January; the median temperature was about 1.5 ° C. Warmest tem- <br />peratures have occurred during July; the median temperature was about 18 ° C. <br />These data indicate that water temperatures of Upper Fountain Creek rarely <br />exceed 20 °C. Water temperatures frequently exceed 20 °C during the summer <br />throughout Lower Fountain Creek as shown in figure 11 for sites F17 and F36. <br />At least 25 percent of the instantaneous water - temperature measurements at <br />each site on Lower Fountain Creek exceeds 20 ° C (fig. 10). The water temper- <br />atures are warmer in Lower Fountain Creek because of warmer climate, inflow <br />22 <br />