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When annual precipitation for 2 years in a row is less <br /> than about 11 inches , most dryland crops fail . Two or more <br /> dry years in a row generally do not occur more than once every <br /> • 10 years . Figures on the normal average temperature and <br /> precipitation by months and year , along with days of snow cover <br /> are given in table 9 . <br /> Total precipitation and snowfall in winter are higher in <br /> the western part of the county than in the eastern part . <br /> Differences are sometimes small but consistent from October to <br /> May. The average annual snowfall is about 59 inches at Denver <br /> and is about 46 inches at Byers . In summer , however , precipita- <br /> tion generally averages somewhat higher in the eastern part of <br /> the county but is highly variable from year to ,year at <br /> different localities . <br /> The average relative humidity is s9 percent through the <br /> day and 62 percent during the night . It is slightly higher in <br /> winter than in summer . On the average , the sun shines 69 per - <br /> cent of the possible hours of sunlight annually . <br /> Hailstorms that are damaging to crops occur in some parts <br /> of the county almost every year . There is no extended pattern <br /> to the hailstorms . They generally occur between May 1S and <br /> September 1 , and they are most likely to occur in .June and -July . <br /> The hail generally falls in strips less than 1 mile wide and <br /> 6 miles long . Hail is more common in the eastern part of the <br /> county than in the western part . <br /> • (See Tables on following page) <br /> • <br />