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are cold in the mountains. The National Climate Center (Asheville! North Carolina) reports temperature averages and extremes ~n nearby Evergreen and Lakewood, adjacent cities which closely represent the conditions found in the mountains and plains , respectively, of Ralston basin. In winter the average temperatures at Evergreen and Lakewood are 28 and 32 degrees F, respecti vely. The average daily minimum temperature in winter is 10 degrees at Evergreen and 20 degrees in Lakewood and the lowest temperature on record at Evergreen was -38 degrees. In summer the average temperature is 61 degrees at Evergreen and 69 degrees at Lakewood. The average daily maximum temperature in summer is 80 degrees and the highest recorded temperature on record is 100 degrees. Monthly temperature records and averages at Lakewood are summarized in Table 1. 4. Precipitation The total annual precipitation is 18 inches at Evergreen and 15 inches at Lakewood. Of this, 70 percent usually falls in April through September. The heaviest I-day rainfall during the period of record was 3.69 inches at Evergreen on May 6, 1969. Thunderstorms occur on about 40 days each year, mostly occurring in the summer. Monthly precipitation records and averages at Lakewood are summarized in Table 1. The average seasonal snowfall is about 65 inches at Lakewood. The greatest snow depth at anyone time during the period of record was 22 inches at Evergreen. TABLE 1 CLIMATOLOGICAL DATA LAKEWOOD, COLORADO (PERIOD OF RECORD 1962-1975) Temperature (degrees) precipitation (inches) Aver Aver Daily Daily Aver Average Month Max Min Dail v Averaqe Snowfall Jan 44 18 31 0.15 6.4 Feb 47 21 34 0.53 7.9 Mar 51 25 38 1.16 14.0 Apr 60 33 46 1. 67 9.8 May 70 43 56 2.21 0.7 Jun 79 51 65 2.15 0.0 Jul 85 58 72 2.04 0.0 Aug 84 56 70 1.16 0.0 Sep 74 46 61 1. 42 0.6 Oct 66 38 52 0.95 4.8 Nov 53 27 40 0.87 9.9 Dec 45 20 33 0.48 9.3 3