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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> Table I <br /> Average .\lonthly Temperature (OF) <br /> Dolores RiHr Basin abO\:e Dolores. Colorado <br />Station Name Cortez Dolores Mancos RIco Silvcnon Telluride <br />Elevation(ft) 6153 6936 7030 8827 9278 8792 <br />Jan 26.6 26.6 25.9 18.6 13.9 19.8 <br />F,b 31.9 31.6 30.5 22.3 17.0 23.6 <br />Mar 38,9 38.3 37.0 28.5 23.3 29.6 <br />Apr 45.6 45,\ 44.0 35.9 30.7 37.0 <br />May 54.5 54.1 52.9 45,2 -10.9 46.2 <br />Jun 64.4 64.0 62.8 53,S 49.1 54.8 <br />Jul 70.8 70.2 68,6 59,0 54.5 59.6 <br />Aug 69.1 68.5 66.9 57.6 53.0 58.4 <br />Scp 61.2 60.8 59.5 50.8 46.5 51.6 <br />0<, -1-9.7 49.4 48.4 41.1 37.1 41.8 <br />Nov 37,0 36.7 35.6 28.0 23.8 28.8 <br />De, 28.5 28.4 27.7 19.9 15.0 21.0 <br />Average <br />Annual 48.2 47,S 46.7 38.4 33.7 39.4 <br />Temocrdture <br /> <br />Source: City.Data.Com ......ebsitc htto:/lwww.city-data.comlciw/Colorado.html <br /> <br />5.5 Precipitation. The Nonna! Annual Precipitation (NAil) at stations located in and <br /> <br />adjoining the upper Dolores River basin varies from a high of 24 inches at Silverton to a <br /> <br />minimum ofamund 12 inches at Pleasant View. The NAP at Dolores is 18.5 inches. The <br /> <br />maximum annual observed precipitation in or adjoining the Dolores basin was 41.5 inches at <br /> <br />Silverton in 1911; the minimum annual precipitation ncar the Dolores Drainage Basin was 5.5 <br /> <br />inches. recorded at Pleasant View during the drought of 1976-1977. The Basin Normal Average <br /> <br />Precipitation (BNAP) for the Dolores River basin above Dolores is 28.8 inches. based on the 30- <br /> <br />year record 1961-1990. Local precipitation records and a regional isohyetal map developed by <br /> <br />Oregon State University were used to calculate the BNAP (Reference 4-q). Table 2 lists station <br /> <br />maximum, minimum. and average annual precipitation and Plate 4 shows the basin normal annual <br /> <br />precipitation isohyetal map and its gage locations. <br /> <br />9 <br />