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<br /> Table 5.- Fall precipitation distribution <br /> 1974 <br /> 1967 <br /> 1961 <br /> 1953 <br /> 1948 <br /> 1947 <br /> 1935 <br /> 1958 1924 <br /> 1949 1921 <br /> 1943 1918 <br /> 1939 1915 1965 1972 <br /> 1938 1914 1960 1971 <br /> 1936 1912 1957 1969 <br /> 1932 1910 1956 1968 <br /> 1930 1909 1954 1966 <br /> 1929 1907 1946 1963 <br /> 1928 1906 1934 1952 <br /> 1925 1905 1933 1944 1962 <br /> 1923 1904 1927 1942 1937 <br /> 1919 1903 1916 1941 1931 1973 <br /> 1959 1911 1901 1913 1940 1922 1945 1970 <br /> 1917 1908 1900 1902 1926 1920 1899 1951 1955 1950 1964 <br />0 12.7 25.4 38.1 50.8 63.5 76.2 88.9 101.6 114.3 127 139.7 <br />(0) (5) (10) (15) (20) (25) (30) (35) (40) (45) (50) (55) <br /> <br />cm <br />(in) <br /> <br /> Precipitation in centimeters (in) <br /> cm (in) cm (in) <br />Mean 44.5 (17.5) Maximum 128.0 (50.4) <br />Median 37.1 (14.6) Minimum 4.8 ( 1.9) <br />Variance 251,7 (99.1 ) Range 123.2 (48.5) <br />Standard Coefficient of <br />deviation 25.3 ( 9.9) variation 56.9 percent <br /> <br />cm (22.5 in). The median is less than the mean of 64.5 cm (25.4 in). Individual years in each <br />histogram class are shown in table 6. <br />Forty-three of the 76 years have had less than the mean winter precipitation. Winter precipita- <br />tion inputs are extremely important because spring precipitation amounts are normally low, and <br />much of the fall precipitation has melted before the end of winter. If there is a deficit, snowpacks <br />disappear early, the meltwater drains from the soils earlier, and the summer drought period is <br />longer. Two such years in succession normally cause destructive stress to trees and other vegeta- <br />tion, This lowers the plants' resistance to insect and disease attack and increases mortality losses. <br /> <br />1-13 <br />