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Average daily wind speeds for a valley and a plateau statation <br />• for the 12-month period from December 1970 through 1971 are <br />shown in Table R-4. <br />RELATIVE HUMIDITY <br />Relative humidity has been measured at the project site by Colony <br />and by Dames & Moore under its 1970-1971 program. During the <br />summer of 1974, relative humidity values were also measured. <br />Relative humidity is extremely susceptible to weather changes <br />and it is affected by such climatological factors as temperature, <br />cloud cover, and precipitation (both in amount and number of <br />occurrences). As these factors vary on a daily as well as a <br />seasonal basis, relative humidity also varies. <br />. A long period of record would, be needed to establish the mean <br />monthly relative humidity. Because data from the site are limited, <br />only an estimate of possible monthly range of the relative humidity <br />for the project site can be made. The expected ranges of relative <br />humidity values for the project site are given in Table R-5. <br />EVAPORATION <br />The mean annual total evaporation for the site was estimated at <br />13.7 inches. This includes snow evaporation, evapotranspiration, <br />and evaporation from bare soil of 3.9, 6.7 and 4.0 inches per year, <br />respectively. The monthly distribution of total evaporation (in <br />inches) is as follows: <br />Jan Feb Mar Air MaY Jun Jul Aug SeP Oct Nov Dec Annual <br />• .88 1.00 1.02 1.13 1.32 1.52 1.64 1.46 1.15 .93 .84 .82 13.7 <br />R-11 <br />