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• TABLE K-3 <br />ESTIMATED MEAN DAILY AVERAGE <br />MAXIMUM AND MINIMUM TEMPERATURES <br />PROJECT SITE <br />Mean daily temperatures, degrees F. <br />Month Average Maximum Minimum <br />Jan 21,5 36.5 7.5 <br />Feb 25.0 39.5 10.0 <br />Mar 31.5 46.0 17.0 <br />Apr 42.0 56.0 27.0 <br />May 52.0 67.0 34.5 <br />Jun 60.0 77.5 40.5 <br />Jul 66.5 84,0 46.5 <br />• Aug 65.0 81.5 45.0 <br />Sept 56.5 75.0 30.0 <br />Oct 46.5 63.5 39.0 <br />Nov 30.5 48.0 18.0 <br />Dec 24.0 40.0 10.5 <br />Annual 43.5 59.5 27.0 <br />Mean average daily temperatures were estimated to be 21.5 degrees <br />F. for January (coldest month), 66.5 degrees F for July (warmest <br />month), and 43.5 degrees F, on an average annual basis. <br />Frost on the valley floor is more common and of greater intensity <br />than on the mesa top due to wintertime air stagnation. Average <br />frost penetration is 24 inches and a 10-year maximum of SO inches <br />may be expected. Latest spring frost date is approximately May 25 <br />. and early fall frost date is mid-September with an average growing <br />R-9 <br />