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<br />. <br /> <br />(\135 <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />7. :temperature. - The mean and maximum temperatures generally vary <br /> <br /> <br />inversely with altitude but the minimum depends largely upon the type <br /> <br /> <br />of air mass over the area. The decrease in temperature up the narrow <br /> <br /> <br />va~leys artd canyons above Trinidad is less than might be expected because <br /> <br /> <br />of the effect of chinook winds caused by the great differential in elevation. <br /> <br /> <br />Trinidad, elevation 6,000 feet, has recorded a maximum of 99 degrees and a <br /> <br /> <br />minimum of -26 degrees. North Lake, elevation 8,800 feet, in the headwaters <br /> <br /> <br />has a recorded maximum and minimum of 86 degrees and -19 degrees, respectively. <br /> <br /> <br />Hoehne, at the upper end of the Plateau region has a maximum recorded tem- <br /> <br /> <br />perature of 1100 and a minimum temperature of _320. Temperature data for <br /> <br /> <br />represe~tative stations are shown in table 5. <br /> <br /> <br />8. Humidi!y. - The basin is c:lliracterized by the low relative humidities. <br /> <br /> <br />Pueblo, Colorado, is the only station with recorded relative humidities <br /> <br /> <br />considered as representative for Trinidad. Based on the Pueblo record <br /> <br /> <br />indications are that the average relative humidity at Trinidad is about 52 <br /> <br /> <br />percent. The records available at Pueblo are shown in table 6. <br /> <br /> <br />9. Evaporation. - There are no evaporation stations in the Purgatoire <br /> <br /> <br />basin; the expected evaporation at Trinidad dam site was computed by <br /> <br /> <br />plotting elevation-evaDoration curves using the data for the stations nearest <br /> <br /> <br />to this basin. The stations used were Johri g".rtin Dam, Colorado;?ueblo, <br /> <br /> <br />Colorado; and Eagle Nest, New :1exico. The data for these stations and the <br /> <br /> <br />computed values at Trinidad dam site are shown in table 7. Actual and <br /> <br /> <br />computed evaporation figures are for Ittyp" AI< land pan. The computed <br /> <br /> <br />average annual evaporation at Trinidad dara site is 71.34 inches, the <br /> <br /> <br />maximum month is June with an average of 10.30 inches. <br /> <br /> <br />10. Wind. - The prevailing wind at Trinidad is westerly with the <br /> <br /> <br />grea test wind movement occurring during the spring months. Records of wind <br /> <br /> <br />movement are not available within the Purgatoire Basin. The nearest <br /> <br /> <br />station at ~lhich such records are available is Pueblo, Colorado.. It is <br /> <br />8 <br /> <br />"D?P B:afiD: B' <br /> <br />