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• 2.1.4 Seasonal Temperatures and Humidity <br />The mean annual temperature for the Craig, Colorado vicinity is 42.3°F <br />C5.7°C). This mean value is calculated from the Kational Weather Service <br />(NWS) temperature data collected in the Craig vicinity for the forty-four (44) <br />year period between 1936 and 1979 (Table 2.1-l2 ). The highest maximum temper- <br />ature for the area reached 100°F (37.8°C) in June of 1936 (Table 2.1-13) but <br />has never been duplicated since. The lowest minimum temperature dropped to <br />minus 45°F (-42.8°C) in January of 1963 (Table 2.1-14 ). Temperatures between <br />minus 30°(F) and minus 40°(F) are not uncommon each winter. The maximum mean <br />monthly temperature of 66.8°F (19.3°C) and the minimum mean monthly tempera- <br />ture of 17.05°F (-8.3°C) occur in July and January respectively. There is an <br />average of 14 days in the year when the maximum temperature reaches 90°F <br />(32.1°C) or higher, and 41 days with maximums 32°F (0°C) and below. For the <br />minimums, 221 days are 32°F (0°C) or colder, of which 39 are 0°F (-17.7°C) or <br />colder (Berry, 1966). <br />. Figure 2.1-15 shows the normal diurnal temperature cycle for Craig by plotting <br />the ambient air temperature against the hour of the day. The minimum tempera- <br />ture usually occurs just before dawn (5:00-7:OOam MST) and the maximum is <br />reached in the afternoon (2:00-S:OOpm MST). <br />Figure 2.1-16 presents the ambient air temperature for each month of the year <br />and depicts the normal annual temperature cycle. These figures are based on <br />data collected during 1971 and 1972 (Stearns-Roger, 1973). <br />• <br />2-42 <br />