YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1893 | 67.32 | 69.71 | 71.70 | a | 84.57 | 90.87 | 103.10 | 99.16 | 96.40 | a | 91.90 | 84.26 | 69.07 | 63.94 | 82.67 | |||||||||||
1894 | 58.87 | 62.96 | 72.19 | 85.00 | 91.60 | a | 96.43 | 99.10 | 94.32 | 95.60 | 85.23 | 78.47 | 60.97 | 81.73 | ||||||||||||
1895 | 59.13 | 64.29 | 73.65 | 84.37 | 92.13 | 99.00 | 96.87 | 95.67 | d | 90.57 | 80.45 | 62.40 | 57.03 | 79.63 | ||||||||||||
1896 | 65.48 | 66.38 | 74.39 | 80.30 | 91.03 | 102.00 | 95.33 | a | 92.42 | 88.22 | c | 76.03 | 69.97 | 64.45 | 80.50 | |||||||||||
1897 | 57.45 | 60.79 | 67.97 | 82.63 | 91.93 | a | 95.80 | 98.65 | 95.87 | 90.03 | a | 80.29 | 74.83 | 62.52 | 79.90 | |||||||||||
1898 | 51.71 | 71.18 | 70.10 | 85.00 | 86.13 | 97.60 | 97.10 | 96.00 | 93.83 | 85.29 | 70.67 | 55.80 | a | 80.03 | ||||||||||||
1899 | 60.90 | 63.89 | 74.52 | 82.03 | 86.97 | 97.00 | a | 98.10 | 96.48 | 95.67 | 80.94 | 71.20 | 63.06 | 80.90 | ||||||||||||
1900 | 67.19 | 66.86 | 77.23 | 73.37 | 93.03 | 102.33 | 103.84 | 98.97 | 91.63 | 84.84 | 76.23 | 67.81 | 83.61 | |||||||||||||
1901 | 65.55 | 65.39 | 73.17 | a | 79.97 | 90.26 | 99.13 | 101.55 | 99.35 | 95.83 | 85.47 | a | 77.50 | 68.19 | 83.45 | |||||||||||
1902 | 66.00 | 70.39 | 71.65 | 87.31 | a | 91.43 | a | 102.50 | 100.45 | 96.52 | 92.27 | 89.77 | 71.40 | 66.17 | a | 83.82 | ||||||||||
1903 | 66.35 | 63.78 | a | 74.13 | a | 84.20 | 89.32 | 99.07 | 102.94 | 99.23 | 91.73 | 85.61 | 81.00 | 66.03 | 83.62 | |||||||||||
1904 | 62.89 | d | 75.03 | 79.67 | d | 86.37 | 90.23 | 100.47 | 100.29 | 94.52 | 90.43 | 83.19 | 77.17 | 64.32 | 83.71 | |||||||||||
1905 | 67.58 | 64.46 | 69.48 | 74.57 | 84.97 | 96.57 | 98.90 | 97.10 | 92.10 | 84.65 | 69.83 | 60.55 | 80.06 | |||||||||||||
1906 | 61.97 | 68.43 | 74.16 | 78.97 | a | 87.84 | 98.33 | 95.77 | 90.37 | a | 91.77 | 83.16 | 72.90 | a | 65.48 | 80.76 | ||||||||||
1907 | 63.74 | 71.25 | 74.19 | 81.69 | a | 83.10 | 93.75 | b | 95.10 | 91.16 | 92.33 | 80.10 | 69.87 | 66.94 | 80.27 | |||||||||||
1908 | 66.32 | 65.56 | d | 74.32 | 79.83 | 83.71 | 95.64 | b | 92.94 | 92.42 | e | 90.87 | 80.10 | a | 72.10 | a | 62.65 | 79.71 | ||||||||
1909 | 67.29 | 65.26 | a | 67.07 | a | 80.71 | b | 86.60 | a | 96.03 | 95.55 | 90.73 | a | 87.23 | 85.24 | b | ----- | z | ----- | z | 82.17 | b | ||||
1910 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 82.26 | 71.00 | 67.82 | c | 73.69 | i | ||
1911 | 67.68 | 65.00 | a | 76.10 | 78.41 | a | 85.70 | a | 93.57 | 89.26 | 93.68 | 88.03 | 77.45 | b | 68.41 | c | 60.19 | 78.62 | ||||||||
1912 | 66.61 | 69.28 | 66.74 | 71.10 | a | 83.26 | 92.43 | 90.10 | b | 86.30 | a | 85.69 | a | 75.07 | b | 71.40 | 60.06 | 76.50 | ||||||||
1913 | 59.87 | a | 63.11 | 69.33 | a | 76.97 | a | 82.97 | a | 90.67 | 92.03 | b | 90.43 | a | 83.83 | a | ----- | z | 70.03 | 60.74 | 76.36 | a | ||||
1914 | 67.21 | b | 69.46 | 75.29 | 79.77 | 88.33 | a | 93.27 | 92.32 | 93.87 | 91.17 | 79.06 | 74.27 | 59.70 | a | 80.31 | ||||||||||
1915 | 60.97 | 64.93 | 69.23 | 76.73 | 82.23 | a | 94.33 | 94.29 | 93.90 | 87.87 | 84.57 | a | 72.13 | 63.35 | 78.71 | |||||||||||
1916 | 61.13 | a | 72.10 | 76.35 | 78.43 | 85.26 | 94.33 | 92.61 | 90.59 | b | 87.40 | 78.10 | b | 72.93 | 62.29 | 79.30 | ||||||||||
1917 | 59.93 | a | 67.46 | 70.55 | 77.33 | 81.45 | 97.20 | 94.97 | 92.57 | a | 88.97 | 85.60 | a | 76.47 | 71.45 | 80.33 | ||||||||||
1918 | 62.57 | a | 69.11 | 74.27 | a | 78.48 | a | 83.39 | 96.77 | 95.61 | 92.52 | 91.86 | a | 82.40 | a | 67.29 | b | 59.61 | 79.49 | |||||||
1919 | 63.20 | a | 62.78 | a | 70.87 | 80.34 | a | 85.03 | a | 96.21 | b | 90.39 | 92.23 | a | 87.37 | 76.84 | 70.60 | 66.31 | b | 78.51 | ||||||
1920 | 63.65 | 66.10 | 68.52 | b | 74.31 | a | 87.70 | a | 93.87 | 98.00 | 91.67 | a | 89.00 | 78.60 | a | 69.27 | 63.61 | 78.69 | ||||||||
1921 | 66.00 | 71.57 | 77.10 | 79.50 | 86.27 | a | 96.00 | b | 91.17 | a | 89.32 | 90.76 | a | 86.57 | a | 75.18 | b | 67.67 | a | 81.42 | ||||||
1922 | 63.94 | 66.93 | 71.37 | a | 76.61 | b | 88.07 | a | 98.48 | a | 96.06 | 95.07 | b | 90.96 | c | 81.50 | c | 67.11 | b | 64.45 | b | 80.04 | ||||
1923 | 69.93 | d | 66.89 | a | 71.15 | d | 79.60 | 90.14 | c | 95.93 | a | 94.45 | 89.07 | a | 87.30 | 80.70 | a | 67.53 | 59.52 | 79.35 | ||||||
1924 | 62.68 | 71.54 | a | 69.94 | 78.22 | c | 88.19 | 99.80 | 95.83 | a | 97.74 | 94.33 | 85.94 | 74.83 | 60.48 | 81.63 | ||||||||||
1925 | 62.94 | 73.25 | 78.40 | a | 83.10 | 87.22 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 74.42 | h | |||
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | 81.14 | w | 91.77 | 100.17 | 105.39 | 99.32 | 99.77 | 88.10 | 71.50 | 62.52 | 89.82 | d | ||||||||
1952 | 63.32 | 67.57 | a | 67.94 | 81.50 | 95.26 | 101.90 | 102.71 | 101.45 | 100.31 | a | 95.74 | 71.23 | 62.87 | 84.32 | |||||||||||
1953 | 70.20 | a | 69.43 | 76.58 | 82.73 | 87.29 | 103.23 | 100.45 | b | 102.10 | 103.13 | 90.58 | 77.87 | 65.13 | 85.73 | |||||||||||
1954 | 68.23 | 77.64 | 74.77 | a | 89.03 | 92.00 | b | 99.90 | 100.58 | 96.13 | 98.00 | 90.84 | 80.57 | 68.90 | 86.38 | |||||||||||
1955 | 61.10 | 64.21 | 76.03 | 82.47 | 89.65 | 99.72 | a | 99.55 | 94.26 | 97.88 | d | 91.67 | j | 75.50 | 70.52 | 82.81 | a | |||||||||
1956 | 70.26 | 63.90 | 79.68 | 82.10 | 95.39 | 103.40 | 101.77 | 100.55 | 99.63 | 84.74 | 70.50 | 65.94 | 84.82 | |||||||||||||
1957 | 64.14 | c | 74.92 | b | 74.00 | 81.21 | a | 86.29 | c | 102.11 | b | 103.27 | a | 98.42 | 99.03 | 81.79 | g | 68.07 | 67.14 | c | 83.51 | a | ||||
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | 70.16 | 68.27 | b | 78.08 | e | 87.50 | b | 91.81 | 104.24 | a | 104.77 | 95.04 | e | 96.62 | a | 86.55 | 72.85 | c | 64.72 | b | 85.05 | |||||
1960 | 59.16 | 62.62 | 78.90 | 86.17 | a | 92.87 | 104.24 | a | 104.21 | b | 102.07 | a | 100.54 | b | 83.90 | 75.88 | f | 64.43 | a | 85.37 | a | |||||
1961 | 67.03 | b | 73.80 | c | 76.79 | l | 85.58 | r | 94.32 | 104.55 | h | 102.80 | u | 98.71 | n | 93.00 | f | 85.94 | 69.04 | b | 63.06 | 75.53 | f | |||
1962 | 61.90 | 68.12 | c | 66.80 | k | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.01 | j | |
1963 | ----- | z | 72.04 | e | 76.03 | 81.70 | 95.61 | 98.73 | 104.77 | 95.19 | 98.13 | 91.26 | 74.80 | 68.55 | 86.98 | a | ||||||||||
1964 | 62.84 | 66.66 | 71.47 | a | 80.13 | 93.26 | 100.40 | 103.19 | 99.07 | a | 91.47 | 89.81 | 70.30 | 65.19 | 82.81 | |||||||||||
1965 | 66.29 | 67.04 | 71.84 | 80.57 | 88.74 | 96.17 | 102.53 | a | 102.20 | a | 94.33 | 91.13 | 76.20 | 63.94 | 83.41 | |||||||||||
1966 | 62.26 | 62.61 | 76.84 | 85.43 | 95.48 | 102.03 | 104.29 | 100.90 | 92.90 | 86.55 | 77.20 | 66.93 | a | 84.45 | ||||||||||||
1967 | 66.77 | a | 73.50 | 79.77 | 81.17 | 90.71 | 98.87 | 101.03 | 100.32 | 95.63 | 87.10 | 77.73 | 58.74 | 84.28 | ||||||||||||
1968 | 64.81 | 72.59 | 72.32 | 79.03 | a | 91.61 | 102.80 | 101.77 | 96.84 | 98.47 | 90.93 | a | 72.73 | 64.26 | 84.01 | |||||||||||
1969 | 66.68 | 67.00 | 70.94 | 86.83 | 94.19 | 100.43 | 104.13 | 104.38 | b | 99.17 | 85.84 | 71.57 | 65.16 | 84.69 | ||||||||||||
1970 | 65.03 | 72.07 | 68.26 | 78.47 | 94.87 | 105.20 | 108.19 | 103.16 | 94.50 | 85.07 | a | 77.53 | 67.35 | 84.98 | ||||||||||||
1971 | 68.19 | 71.11 | a | 82.16 | 83.30 | 89.90 | 102.33 | 107.97 | 99.90 | 97.13 | 78.32 | 71.17 | 58.43 | a | 84.16 | |||||||||||
1972 | 66.45 | 73.25 | a | 84.97 | 86.00 | a | 94.32 | 101.77 | 105.81 | 101.39 | 97.80 | 80.42 | 67.47 | 62.29 | 85.16 | |||||||||||
1973 | 60.26 | 65.71 | 64.32 | 76.70 | 93.19 | 101.03 | 102.94 | 104.26 | ----- | z | 90.81 | 74.73 | 67.65 | 81.96 | a | |||||||||||
1974 | 64.87 | 70.89 | 75.87 | 84.33 | 94.61 | 107.43 | 101.94 | 101.29 | 95.73 | 83.42 | 72.37 | 61.35 | 84.51 | |||||||||||||
1975 | 64.71 | 66.44 | a | 71.65 | 76.20 | 90.13 | 101.43 | 102.42 | 104.06 | 96.80 | 88.23 | a | 75.43 | 66.87 | 83.70 | |||||||||||
1976 | 67.39 | 72.66 | 74.10 | 82.10 | 93.35 | 103.63 | 101.19 | 103.03 | 93.63 | 81.81 | 74.47 | 67.13 | 84.54 | |||||||||||||
1977 | 63.84 | 73.00 | 71.97 | 84.60 | 89.68 | 103.13 | 104.06 | 102.84 | 97.93 | 87.61 | 76.40 | 69.29 | 85.36 | |||||||||||||
1978 | 64.26 | 66.18 | 75.39 | 82.43 | 91.58 | 104.83 | 104.84 | 101.16 | 96.73 | 89.42 | 70.50 | 59.50 | a | 83.90 | ||||||||||||
1979 | 58.35 | 67.89 | 69.81 | 83.55 | a | 89.73 | a | ----- | z | 103.61 | m | 98.68 | 97.97 | 89.58 | 71.10 | 69.48 | 79.61 | b | ||||||||
1980 | 65.90 | 70.28 | 71.03 | a | 83.14 | a | 90.45 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 76.16 | g | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 64.21 | 68.28 | 73.44 | 81.18 | 89.61 | 99.23 | 99.33 | 96.75 | 93.57 | 84.52 | 72.66 | 64.15 | 82.16 | |||||||||||||
S.D. | 3.57 | 3.80 | 4.03 | 3.76 | 3.79 | 3.73 | 4.79 | 4.49 | 4.39 | 4.49 | 3.72 | 3.51 | 2.46 | |||||||||||||
SKEW | -0.75 | 0.22 | 0.34 | -0.28 | -0.34 | -0.15 | -0.31 | -0.13 | -0.04 | 0.01 | 0.04 | -0.18 | -0.23 | |||||||||||||
MAX | 70.26 | 77.64 | 84.97 | 89.03 | 95.61 | 107.43 | 108.19 | 104.38 | 103.13 | 95.74 | 81.00 | 71.45 | 86.38 | |||||||||||||
MIN | 51.71 | 60.79 | 64.32 | 71.10 | 81.45 | 90.67 | 89.26 | 86.30 | 83.83 | 75.07 | 62.40 | 55.80 | 76.50 | |||||||||||||
YRS | 59 | 60 | 58 | 58 | 59 | 56 | 56 | 57 | 56 | 56 | 57 | 58 | 48 |