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i • <br /> CLIMATE INFORMATION ExNISIT K <br /> (Rules 6 Regs§6.4.111 <br /> CONSTRUCTION MATERIAL PERMIT NP M 2001-. .... ... <br /> REGULAR 112 OPERATION <br /> ° WEIMER ONE GRAVEL" <br /> January 2001 <br /> Average annual precipitation is about 16 inches. Of this about 50% falls between April 1 through <br /> September 30. Summer moisture is mostly from thundershowers in late July, August, and <br /> September. A dry period from May to early July is typical, and Tune is normally the driest month. <br /> Wide yearly and monthly deviations are common. <br /> The most active growth of major native plants usually starts in April. It extends through most of <br /> June for some plants, but ends in late May for others. Many plants can again take advantage of late <br /> summer rains if they are in good vigor. <br /> Mean annual temperatures are about 45 ° F. The frost-free period is about 152 days. June, July, and <br /> August average 64' F. Annual range in temperature is usually from about 90' to a chilly —15' F., <br /> although higher and lower extremes are sometimes recorded. A few areas are warmer and slightly <br /> more moist that typical. Typical warm, dry weather in late spring and early summer puts warm- <br /> season plants at a very distinct disadvantage compared to plants that grow earlier on stored winter <br /> moisture and spring rains. Deep storage of winter moisture allows sagebrush and smaller trees to <br /> compete strongly with shallower-rooted grasses during this dry period where other factors encourage <br /> their spread. <br /> 25 <br />