YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1911 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1912 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1913 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1914 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1915 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1917 | ----- | z | ----- | z | ----- | z | ----- | z | 84.03 | 103.17 | 97.08 | f | 97.81 | 93.00 | 90.39 | 80.34 | a | 76.20 | a | 89.28 | e | |||||
1918 | 64.85 | d | 69.30 | a | 76.17 | b | 80.62 | a | 83.77 | 100.53 | 99.39 | 94.77 | 96.53 | 86.58 | 69.57 | 59.84 | 81.83 | |||||||||
1919 | 63.94 | 62.11 | 71.19 | 84.70 | 89.73 | a | 101.03 | 95.52 | 99.19 | 93.59 | a | 79.74 | d | 70.73 | 68.81 | 81.69 | ||||||||||
1920 | 67.16 | 68.34 | 72.39 | 80.17 | 92.45 | 100.20 | 105.00 | l | 96.29 | 93.50 | d | 80.10 | k | 71.21 | a | 63.73 | e | 80.54 | b | |||||||
1921 | 65.57 | c | 75.46 | 78.81 | 82.60 | 87.81 | 100.70 | 96.97 | a | 94.73 | a | 95.10 | 89.27 | a | 77.40 | 69.63 | a | 84.50 | ||||||||
1922 | 61.58 | 68.25 | 70.35 | 76.53 | 92.68 | 103.20 | 101.06 | 98.77 | 98.10 | 87.13 | a | 69.79 | a | 68.58 | 83.00 | |||||||||||
1923 | 71.74 | 66.75 | 72.35 | 80.86 | a | 95.42 | 98.46 | f | 99.00 | l | 95.23 | a | 93.62 | a | 84.29 | 71.90 | 63.00 | 79.52 | b | |||||||
1924 | 69.56 | d | 76.32 | g | 70.67 | a | 80.08 | f | 94.14 | j | 104.28 | e | 102.05 | i | 102.30 | k | 98.08 | f | 86.92 | s | ----- | z | ----- | z | 81.50 | i |
1925 | 66.94 | o | 77.47 | k | 83.92 | g | 88.43 | g | 92.71 | j | 99.50 | t | 100.56 | f | 96.73 | i | ----- | z | ----- | z | ----- | z | 67.83 | s | ----- | z |
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 | 71.45 | a | 69.74 | 70.60 | j | |
1941 | 65.13 | 70.18 | 71.71 | 74.57 | 89.87 | 97.03 | 100.84 | 97.23 | 94.13 | 82.03 | 77.37 | 66.58 | 82.22 | |||||||||||||
1942 | 67.65 | 66.43 | 73.26 | 80.07 | 90.42 | 100.77 | 103.06 | 97.03 | 97.77 | 86.03 | 79.60 | 72.06 | 84.51 | |||||||||||||
1943 | 68.94 | 74.25 | 77.61 | 87.03 | 93.65 | 97.87 | 101.42 | 97.16 | 100.60 | 90.52 | 79.79 | a | 66.29 | c | 86.26 | |||||||||||
1944 | 65.94 | 65.32 | a | 74.00 | 80.10 | 89.71 | 97.30 | 102.81 | 100.87 | 95.36 | s | 89.61 | 69.03 | 67.50 | a | 82.02 | a | |||||||||
1945 | 64.94 | 70.18 | 71.03 | a | 83.00 | ----- | z | ----- | z | ----- | z | 96.81 | 96.80 | 86.13 | 78.57 | 69.61 | 79.67 | c | ||||||||
1946 | 62.39 | 69.64 | 78.50 | c | 88.86 | a | 89.97 | 102.97 | 99.00 | 96.32 | 94.97 | 79.65 | 71.50 | 70.29 | 83.67 | |||||||||||
1947 | 62.29 | 73.64 | 75.94 | 81.79 | a | 91.58 | 97.70 | 102.84 | 96.06 | 97.43 | 85.74 | 67.03 | 61.67 | a | 82.81 | |||||||||||
1948 | 69.50 | a | 65.00 | a | 68.20 | a | 85.00 | 92.58 | 99.10 | a | 101.90 | a | 98.00 | h | 96.70 | c | 85.81 | 70.30 | 64.30 | a | 81.67 | a | ||||
1949 | 51.71 | c | 65.56 | c | 72.72 | b | 83.17 | 89.42 | 97.83 | 98.68 | 99.81 | 96.17 | 81.55 | 82.17 | 65.29 | 82.01 | ||||||||||
1950 | 64.48 | 71.96 | 75.74 | 87.13 | 88.45 | 99.03 | 96.35 | 100.57 | a | 94.73 | 94.32 | 81.37 | 75.26 | 85.78 | ||||||||||||
1951 | 64.94 | 67.61 | 74.42 | 79.40 | ----- | z | 97.71 | i | 102.11 | c | 97.70 | a | 99.10 | 87.65 | 71.34 | a | 63.32 | 80.76 | b | |||||||
1952 | 63.03 | 66.67 | b | 63.94 | 78.47 | 93.10 | 98.63 | 101.19 | 99.81 | 99.00 | a | 94.74 | 69.07 | 62.07 | a | 82.48 | ||||||||||
1953 | 69.67 | a | 67.61 | 73.23 | 79.27 | 83.80 | a | 99.80 | e | 99.52 | 100.23 | a | 100.97 | 87.77 | a | 77.33 | 65.06 | 83.69 | ||||||||
1954 | 67.37 | a | 75.89 | a | 71.13 | 86.83 | 90.45 | 97.33 | 99.52 | 95.29 | 97.73 | 90.00 | a | 79.83 | a | 67.93 | b | 84.94 | ||||||||
1955 | 57.87 | 64.32 | 74.77 | 81.14 | h | 86.50 | a | 99.25 | b | 96.32 | c | 92.68 | 97.25 | b | 92.00 | 75.63 | 71.07 | b | 82.52 | a | ||||||
1956 | 71.17 | a | 61.26 | b | 78.80 | a | 79.59 | a | 92.71 | 102.20 | 100.04 | c | 99.10 | b | 102.21 | a | 87.93 | a | 74.69 | d | 68.21 | b | 84.83 | |||
1957 | 65.24 | f | 74.40 | c | 73.17 | a | 80.50 | 86.71 | 102.13 | 102.68 | 100.16 | 99.04 | c | 81.69 | e | 67.89 | b | 68.97 | 85.21 | a | ||||||
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | 71.03 | 66.57 | 77.00 | b | 87.80 | 90.00 | b | 103.60 | 102.07 | b | 95.19 | d | 97.18 | b | 88.79 | b | 74.19 | c | 65.37 | d | 84.90 | |||||
1960 | 59.21 | b | 64.47 | j | 78.74 | h | 87.50 | j | 93.56 | f | 105.00 | f | 103.97 | b | 100.30 | k | 99.30 | c | 85.19 | 77.37 | c | 66.26 | 81.88 | f | ||
1961 | 67.61 | 70.36 | 74.84 | 85.03 | 92.13 | 102.55 | a | 101.65 | 97.42 | 93.27 | 87.48 | 69.50 | 63.84 | 83.81 | ||||||||||||
1962 | 63.26 | 69.71 | 69.81 | 89.97 | 90.23 | 99.87 | 102.55 | 104.45 | 95.70 | 87.81 | 78.60 | e | 68.55 | b | 85.04 | |||||||||||
1963 | 62.07 | a | 74.82 | 73.11 | c | 83.28 | e | 95.57 | c | 97.96 | b | 103.63 | a | 96.93 | c | 99.45 | j | 91.22 | h | 77.12 | m | ----- | z | 85.92 | d | |
1964 | 64.39 | h | 64.61 | f | 68.83 | g | 81.25 | f | 91.00 | f | 99.34 | a | 102.24 | b | 94.12 | e | 93.84 | e | 90.96 | d | 69.96 | g | 67.95 | i | 96.10 | g |
1965 | 68.36 | i | 67.00 | g | 70.92 | f | 81.57 | g | 89.19 | j | 96.57 | i | 101.41 | i | 101.71 | j | 93.90 | i | 92.95 | l | 79.18 | h | 63.42 | e | 63.42 | k |
1966 | 60.82 | i | 62.04 | d | 75.63 | d | 85.37 | c | 94.42 | g | 101.08 | d | 102.48 | b | 98.71 | g | 95.19 | d | 86.41 | d | 76.65 | g | 70.92 | f | 86.89 | e |
1967 | 68.18 | i | 74.27 | f | 80.46 | g | 80.26 | k | 90.08 | g | 96.30 | 100.30 | h | 99.59 | d | 97.07 | c | 88.69 | e | 84.00 | h | 60.45 | 88.42 | g | ||
1968 | 65.65 | 72.52 | 72.39 | 79.00 | b | 91.94 | 101.30 | 99.35 | 96.45 | 97.32 | b | 87.55 | 73.27 | d | 64.74 | 83.46 | ||||||||||
1969 | 68.97 | b | 66.64 | 72.19 | e | 84.54 | d | 92.27 | e | ----- | z | 96.50 | u | 95.58 | l | 96.92 | q | 86.33 | j | 74.12 | m | 68.67 | m | 76.92 | g | |
1970 | 67.65 | n | 74.47 | i | 71.19 | j | 78.38 | i | 93.50 | k | 101.42 | k | 101.82 | i | 99.52 | j | 95.16 | k | 81.95 | i | 80.17 | l | 67.86 | j | ----- | z |
1971 | 68.30 | k | 71.24 | k | 78.62 | j | 82.05 | i | 88.74 | l | 97.35 | g | 103.17 | h | 94.00 | i | 96.79 | k | 83.41 | n | 73.55 | j | 60.45 | k | ----- | z |
1972 | 68.86 | j | 72.21 | j | 84.71 | j | 86.47 | k | 92.21 | l | 98.14 | h | 103.21 | l | 98.35 | h | 96.20 | j | 82.38 | o | 67.58 | k | 60.17 | s | ----- | z |
1973 | 66.60 | p | 65.67 | j | 64.08 | e | 78.36 | b | 92.73 | e | 101.43 | g | 101.50 | c | 100.50 | e | 97.31 | d | 89.91 | i | 78.54 | b | 74.54 | r | 87.57 | e |
1974 | 67.50 | g | 70.37 | a | 77.00 | n | 86.25 | j | 91.19 | 103.43 | g | 98.88 | n | 100.68 | i | 94.69 | n | 84.95 | j | 74.32 | k | 61.75 | g | 80.78 | j | |
1975 | 67.29 | g | 67.73 | f | 70.61 | h | 73.77 | 87.00 | c | 98.31 | n | 99.41 | n | 96.52 | j | 88.75 | v | ----- | z | ----- | z | ----- | z | 80.38 | j | |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.18 | c | 67.18 | k |
1999 | 73.17 | a | 76.08 | b | 80.07 | b | 77.72 | a | 90.63 | a | 99.42 | d | 97.75 | c | 100.36 | c | 97.96 | e | 93.73 | e | 83.17 | a | 68.43 | c | 86.54 | |
2000 | 73.07 | b | 74.12 | e | 73.72 | f | 87.79 | b | 95.46 | e | 100.93 | b | 103.08 | f | 98.23 | i | 99.80 | e | 84.32 | l | 67.42 | k | 71.33 | g | 88.53 | f |
2001 | 64.67 | j | 66.86 | f | 70.56 | m | 83.27 | h | 98.10 | j | 103.10 | i | 101.29 | g | 101.16 | l | 99.18 | h | 90.74 | d | 80.17 | f | 66.54 | c | 78.64 | j |
2002 | 69.23 | e | 72.91 | f | 77.83 | g | 87.74 | c | 93.04 | e | 105.08 | d | 102.20 | f | 102.04 | h | 99.50 | b | 85.58 | g | 80.23 | d | 67.84 | f | 89.14 | f |
2003 | 75.82 | i | 69.33 | d | 73.64 | f | 80.00 | g | 93.86 | c | 100.16 | e | 104.48 | h | 98.88 | g | 99.64 | h | 92.00 | j | 73.43 | i | 70.56 | d | 83.48 | h |
2004 | 65.17 | h | 66.58 | e | 83.52 | h | 80.90 | j | 94.12 | f | 100.68 | b | 100.50 | i | 97.45 | k | 98.29 | m | 83.82 | i | 70.62 | f | 66.39 | h | 83.63 | j |
2005 | 67.40 | p | 66.12 | b | 74.73 | e | 84.14 | h | 92.19 | e | 99.77 | h | 107.19 | e | 98.77 | e | 100.12 | f | 88.20 | f | 79.59 | c | 70.57 | c | 84.17 | e |
2006 | 71.73 | a | 75.89 | 72.11 | d | 84.63 | c | 98.26 | d | 105.23 | d | 103.92 | f | 99.74 | d | 93.74 | g | 88.58 | e | 82.78 | c | 69.24 | f | 86.55 | c | |
2007 | 63.75 | c | 73.68 | c | 80.96 | c | 85.54 | d | 95.54 | g | 104.71 | f | 103.64 | c | 100.66 | b | 98.35 | d | 88.58 | e | 84.21 | a | 63.07 | c | 84.24 | b |
2008 | 65.65 | e | 67.94 | k | 78.65 | 87.43 | b | 91.23 | i | 102.62 | q | 101.29 | x | 99.68 | i | 97.12 | v | 90.17 | m | 78.38 | a | 64.71 | 74.96 | g | ||
2009 | 69.21 | b | 70.15 | b | 78.58 | 82.77 | 95.44 | d | 96.63 | 104.53 | a | 102.61 | 98.31 | a | 83.90 | 76.55 | a | 62.57 | x | 87.15 | a | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 66.08 | 69.36 | 73.80 | 82.66 | 90.97 | 100.33 | 101.02 | 98.07 | 96.98 | 87.47 | 75.56 | 66.89 | 83.90 | |||||||||||||
S.D. | 4.46 | 4.10 | 3.87 | 4.06 | 3.33 | 2.38 | 2.61 | 2.54 | 2.34 | 3.70 | 4.90 | 3.71 | 1.47 | |||||||||||||
SKEW | -0.84 | 0.00 | -0.45 | -0.20 | -0.38 | 0.27 | -0.24 | 0.16 | 0.04 | -0.23 | -0.07 | 0.34 | 0.12 | |||||||||||||
MAX | 73.17 | 76.08 | 80.96 | 89.97 | 98.26 | 105.23 | 107.19 | 104.45 | 102.21 | 94.74 | 84.21 | 76.20 | 86.54 | |||||||||||||
MIN | 51.71 | 61.26 | 63.94 | 73.77 | 83.77 | 96.30 | 95.52 | 92.68 | 93.00 | 79.65 | 67.03 | 59.84 | 81.69 | |||||||||||||
YRS | 37 | 39 | 38 | 38 | 38 | 37 | 33 | 36 | 37 | 36 | 38 | 39 | 20 |