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Climate Data <br />Tables 3 and 4 provide trend and persistence statistics for long-term climate stations in the basin. As <br />in the streamflow data, persistence is limited to 1 year. Significant trends were observed in the <br />Blanca and Great Sand Dunes precipitation data (increasing) and the Center and Saguache <br />temperature data (decreasing) for the 1950 to 1995 period. These fmdings may help explain some of <br />the increasing trend observed in certain streamflows. <br />There are a number of climate stations in the basin, though only six have complete records from 1950 <br />to the present (Table 5). Few climate stations above 8,000 ft elevation have long-term records; this <br />may present difficulties if upstream inflows need to be synthesized. <br />Table 3. Annual Precipitation Statistics-1950-1995 <br /> Annual Precipitation Values <br />Station <br />ID Station Name Number of <br />Complete Years Mean Max Min Std. <br />Dev. Persistence Trend <br />130 Alamosa WSO AP 43 7.16 11.55 3.40 1.93 none None <br />776 Blanca 43 8.21 12.36 3.49 2.02 none 0.50 <br />1458 Center 4 SSW 46 7.14 11.13 3.74 2.00 none None <br />2184 Del Norte 44 10.04 16.85 5.11 2.94 none None <br />3541 Great Sand Dunes 41 10.90 16.96 5.85 3.05 none 0.38 <br />7337 Sa uache 43 8.43 16.22 4.46 2.40 1 r None <br />Table 4. Annual Temperature Statistics-1950-1995 <br /> Avera a Annual Tem erature Values <br />Station <br />ID Station Name Number of <br />Complete Years Mean Max Min Std. <br />Dev. Persistence Trend <br />130 Alamosa WSO AP 44 41.31 44.23 38.55 1.31 none None <br />776 Blanca Tem erature data starts in 1960 <br />1458 Center 4 SSW 45 40.97 45.35 36.65 1.86 1 yr -0.46 <br />184 Del Norte 43 43.19 46.11 40.85 1.28 1 yr None <br />3541 Great Sand Dunes No temperature data <br />7337 Sa uache 45 42.22 46.06 37.71 1.82 1 r -0.54 <br />C:Acdss\Task2-3.doc Identify Study Period April 16, 1999 Page 8 of 18 <br />