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<br />Table 6.- Winter precipitation distribution <br /> <br />1971 <br />1965 <br />1964 <br />1963 <br />1960 <br />1948 <br />1946 <br />1943 <br />1938 <br />1934 <br />1932 <br />1931 <br />1928 1967 <br />1927 1974 1956 <br />1924 1970 1955 <br />1922 1952 1953 1973 <br />1920 1950 1942 1972 <br />1919 1947 1929 1969 <br />1954 1918 1944 1926 1966 1961 <br />1945 1916 1941 1917 1962 1959 <br />1933 1915 1940 1914 1958 1951 1968 <br />1930 1912 1936 1913 1935 1949 1957 <br />1925 1909 1902 1904 1921 1937 1910 <br />1911 1923 1907 1899 1901 1900 1905 1908 1906 1939 1903 <br />12.7 25.4 38.1 50.8 63.5 76.2 88.9 101.6 II4,3 127 139,7 152.4 cm <br />(5) (10) (15) (20) (25) (30) (35) (40) (45) (50) (55) (60) (in) <br /> <br /> Precipitation in centimeters (in) <br /> cm (in) cm <br />Mean 64.5 (27.4) Maximum 141.9 <br />Median 57.2 (22.5) Minim urn 24.9 <br />Variance 242,8 (95.6) Range II7.1 <br />Standard Coefficient of <br />deviation 24.84 ( 9.78) variation 38.5 percent <br /> <br />(in) <br /> <br />(55.9) <br />( 9.8) <br />(46. I) <br /> <br />Spring.-Spring precipitation (April through June) normally contributes less than 15 percent to <br />the yearly total. Figure 10 presents the spring precipitation trend over the 76 years of record. A <br />gradual rise in the maximum amount has been recorded. Only 6 years show precipitation amounts <br />above the mean of 17.8 cm (7.0 in) during the first 25 years of record. In the last 25 years, however, <br />the mean is exceeded 14 times, once by nearly four standard deviations to 57.4 em <br />(22.6 in) in 1962. The later years are also characterized by greater variability between years. For <br />example, spring precipitation rose from 9.7 cm (3.8 in) in 1965 to 45.5 cm (17.9 in) in 1966, only to <br />slip to 8.1 cm (3.2 in) in 1967. <br /> <br />1-15 <br />