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4-98 <br />• the McClane and Munger Canyon Mines provided they met the <br />statistical comparability requirements. <br />4.8.9 Regional Ecological Characteristics <br />The climate of the project site is similar to that of Grand <br />Junction. However, the project site is over 1,000 feet higher <br />in elevation and hence may be expected to be cooler, more moist, <br />and have a shorter growing season. <br />Table 4.8-1 presents normal and extreme temperatures and pre- <br />cipitation means for Grand Junction based on data from 1941 to <br />1970. The frost free season in Grand Junction may be 191 days <br />in length but may be expected to be considerably shorter at the <br />• project site. Temperatures at Grand Junction have ranged from <br />105° to -23°, but readings of 100° or higher are infrequent, and <br />about one-third of the winters have no readings below zero. <br />Summer days with maximum temperatures in the middle and low 90's <br />and minima in the low 60's are common. Relative humidity is very <br />low during the summer. Winds are usually very light during the <br />coldest weather. Changes in winter are generally gradual, and <br />abrupt changes are much less frequent than in eastern Colorado. <br />"Cold waves" are rare. Sunny days predominate in all seasons. <br />The interior, continental location results in quite low precipi- <br />tation in all seasons. The yearly average is 8.41 inches. Summer <br />rains occur chiefly as scattered light showers from thunderstorms <br />• <br />