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• from 1.SoF in January to 40.9oF in July. Freezing temperatures can <br /> occur during any month of the year. The average annual growing <br />season (above 20oF) of irrigated lead near the Yampa River and <br />Steamboat Springs is 102 days according to the Colorado Water <br />Conservation Board and USDA, 1969. <br />In general, mean temperatures at Hayden are about 3o to 4oF <br />warmer than corresponding mean temperatures at Steamboat Springs. <br />Monthly means at Hayden range from 17.3oF in January to 65.9oF in <br />July. Mean daily maxima range from 31.OoF in January to 85.3oF in <br />July. Eztreme temperatures of 100oF and -45oF Were recorded at <br />Hayden in 39 years of observations, Aa in Steamboat Springs, <br />freezing temperatures can occur during any month of the year in <br />• Hayden. <br />Wind. The east-West orientation of the Yampa Valley is <br />conducive to easterly dowslope breezes during nighttime hours and <br />stronger Westerly upslope Winds during the day. Local terrain has <br />the effect of shielding the valley With respect to surface air <br />motion, and consequently, calm or near-calm conditions are common, <br />especially in late evening and in the early morning. <br />Preliminary information on atmospheric stability and associated <br />air motion has been collected near Craig and may be used as an <br />indication of air movement patterns farther up the Yampa River <br />• Valley. Four stability categories are defined: stable, unstable, <br />neutral and transition conditions. Stable conditions occur When the <br />2.04-61 <br />