YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 86.93 | a | 78.47 | 58.10 | 74.50 | i | ||
1933 | 59.83 | a | 63.21 | 77.81 | 79.67 | 87.48 | 103.07 | 109.61 | 106.97 | 103.60 | 96.52 | 81.03 | 71.39 | 86.68 | ||||||||||||
1934 | 69.74 | 75.35 | b | 88.71 | 93.17 | a | 101.52 | b | 100.10 | 108.87 | a | 104.85 | e | 100.23 | 91.40 | a | 77.10 | a | 66.77 | a | 89.82 | |||||
1935 | 62.43 | a | 69.29 | 71.53 | a | 81.66 | a | 88.39 | 102.48 | e | 103.31 | e | ----- | z | 100.30 | 88.55 | 71.37 | 66.67 | a | 82.36 | a | |||||
1936 | 66.42 | 72.29 | o | 82.00 | a | 91.28 | a | 99.29 | 107.00 | a | 108.52 | 105.94 | 99.28 | a | 87.43 | a | 75.87 | 65.26 | 89.84 | a | ||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | 68.83 | s | 70.79 | 70.68 | 85.43 | 98.74 | 102.00 | 108.16 | 108.60 | f | 104.30 | 98.71 | 72.00 | 64.90 | 87.57 | b | ||||||||||
1953 | 71.58 | 71.64 | 80.06 | 84.47 | 87.48 | 103.27 | 108.45 | 107.13 | 105.70 | 89.03 | a | 77.90 | 65.23 | 87.66 | ||||||||||||
1954 | 65.48 | 78.48 | a | 74.35 | 91.30 | 97.43 | a | 102.20 | 108.23 | 105.13 | 102.77 | 93.52 | 80.23 | 66.70 | a | 88.82 | ||||||||||
1955 | 59.90 | 66.18 | 78.00 | 83.80 | 92.55 | 103.03 | 105.03 | 103.23 | 102.47 | 93.77 | 75.67 | 70.77 | 86.20 | |||||||||||||
1956 | 71.29 | 67.83 | 81.61 | 84.90 | 96.35 | 105.83 | 106.97 | 107.06 | 106.70 | 88.94 | 76.93 | 69.19 | 88.63 | |||||||||||||
1957 | 64.73 | a | 77.14 | 80.00 | 85.67 | 91.74 | 106.83 | 109.90 | 104.77 | 104.80 | 86.03 | 72.23 | 72.39 | 88.02 | ||||||||||||
1958 | 72.10 | 75.54 | 72.29 | 86.93 | 102.45 | 106.43 | 111.39 | 109.23 | 103.87 | 96.42 | 78.60 | 78.06 | 91.11 | |||||||||||||
1959 | 73.55 | 71.07 | 84.65 | 93.53 | 94.87 | 108.63 | 111.26 | 104.94 | 99.77 | 94.03 | 78.90 | 64.90 | 90.01 | |||||||||||||
1960 | 61.26 | 66.69 | 82.06 | 88.23 | 94.68 | 107.63 | 109.87 | 106.71 | 101.40 | 87.29 | 75.60 | 66.42 | 87.32 | |||||||||||||
1961 | 69.65 | 74.32 | 78.10 | 89.13 | 92.94 | 106.76 | a | 108.35 | 105.10 | a | 96.47 | 88.81 | 71.30 | 63.35 | 87.02 | |||||||||||
1962 | 65.35 | 69.50 | 72.35 | 92.77 | 91.23 | 102.80 | 107.74 | 108.61 | 101.13 | 90.16 | 80.00 | 68.26 | 87.49 | |||||||||||||
1963 | 63.87 | 77.75 | ----- | z | 81.53 | 96.65 | 98.40 | 108.52 | 103.74 | 102.03 | 91.23 | 74.27 | 67.35 | 87.76 | a | |||||||||||
1964 | 63.87 | 68.86 | 74.77 | 83.20 | 92.32 | 101.17 | a | 107.84 | 104.81 | 99.67 | 94.97 | 70.83 | 67.55 | 85.82 | ||||||||||||
1965 | 68.35 | 71.50 | 74.19 | 82.13 | 91.27 | a | 97.80 | 106.77 | 106.17 | a | 97.13 | 95.17 | a | 76.20 | 63.71 | 85.87 | ||||||||||
1966 | 62.26 | 66.89 | 80.19 | 89.73 | 98.03 | 103.97 | 106.84 | 106.87 | 100.13 | 88.29 | 77.83 | 67.03 | 87.34 | |||||||||||||
1967 | 67.32 | 75.11 | 79.52 | 77.53 | 93.29 | 99.50 | 108.45 | 108.13 | a | 96.97 | 92.74 | 80.23 | 60.16 | 86.58 | ||||||||||||
1968 | 66.55 | 76.24 | 78.55 | 84.48 | a | 94.16 | 104.21 | a | 104.89 | c | 101.29 | 100.83 | a | 88.16 | 74.62 | a | 62.32 | 86.36 | ||||||||
1969 | 67.52 | 67.29 | 74.03 | 86.60 | 97.16 | 100.17 | 107.10 | 109.52 | 101.13 | 84.23 | 73.60 | 67.16 | 86.29 | |||||||||||||
1970 | 65.39 | 73.93 | 73.90 | 80.40 | 95.65 | 104.00 | 108.97 | 105.90 | 98.57 | 84.90 | a | 76.13 | 63.45 | 85.93 | ||||||||||||
1971 | 66.84 | 72.36 | 80.06 | 83.73 | 88.65 | 101.93 | 109.13 | 102.13 | 99.83 | 81.61 | 72.63 | 61.71 | 85.05 | |||||||||||||
1972 | 65.16 | 74.86 | 87.06 | 86.93 | 94.10 | 102.40 | 109.65 | 104.10 | 98.70 | 80.52 | 68.87 | 62.03 | 86.20 | |||||||||||||
1973 | 62.52 | ----- | z | 67.81 | 83.30 | 97.97 | 105.87 | 109.26 | 106.42 | 100.60 | 90.39 | 74.60 | 68.90 | 87.97 | a | |||||||||||
1974 | 63.39 | 71.65 | b | 79.30 | a | 85.93 | 95.94 | 108.63 | 106.13 | a | 106.55 | 100.76 | a | 88.19 | 75.47 | 62.55 | 87.04 | |||||||||
1975 | 65.87 | 69.29 | 73.68 | 76.87 | 92.55 | 103.33 | 107.42 | 107.32 | 101.13 | 87.97 | 74.33 | 67.42 | 85.60 | |||||||||||||
1976 | 68.94 | 72.17 | 75.13 | 82.83 | 96.39 | 104.23 | 106.48 | 105.71 | 94.97 | 86.06 | 76.47 | 67.42 | 86.40 | |||||||||||||
1977 | 64.32 | 75.79 | 72.94 | 88.27 | 87.03 | 106.13 | 108.87 | a | 105.26 | 100.20 | 91.68 | 78.43 | 71.35 | 87.52 | ||||||||||||
1978 | 63.52 | 68.46 | 77.42 | 83.17 | 94.13 | 107.03 | 110.10 | 106.35 | 98.53 | 92.71 | 70.97 | 60.03 | 86.04 | |||||||||||||
1979 | 57.26 | 68.46 | 73.42 | 85.27 | 93.23 | 105.27 | 108.87 | 104.00 | 105.10 | 91.84 | 72.17 | 69.81 | 86.22 | |||||||||||||
1980 | 66.47 | a | 72.59 | 72.55 | 84.63 | 89.48 | 104.83 | 110.68 | 106.65 | 102.90 | 90.55 | 77.93 | 74.23 | 87.79 | ||||||||||||
1981 | 71.70 | a | 74.36 | 75.84 | 89.60 | 93.39 | 108.63 | 110.45 | 109.10 | 101.53 | 84.81 | 78.90 | 70.13 | 89.04 | ||||||||||||
1982 | 64.17 | a | 71.22 | a | 74.07 | a | 84.80 | 93.61 | 103.21 | a | 106.93 | a | 104.83 | b | 98.39 | b | 85.42 | 70.43 | 61.30 | a | 84.87 | |||||
1983 | 67.03 | 68.89 | a | 73.71 | 78.87 | 94.46 | c | 102.48 | a | 107.65 | 102.66 | b | 101.48 | c | 87.87 | 74.67 | 67.81 | 85.63 | ||||||||
1984 | 68.26 | 72.21 | 80.97 | a | 84.89 | c | 101.63 | a | 101.96 | b | 104.41 | b | 104.61 | c | 101.47 | 83.28 | b | 73.39 | b | 60.79 | b | 86.49 | ||||
1985 | 62.72 | b | 67.43 | 75.03 | a | 90.47 | 96.93 | a | 107.36 | b | 109.66 | b | 108.60 | a | 94.55 | a | 85.93 | b | 70.83 | 66.30 | a | 86.32 | ||||
1986 | 74.00 | a | 73.26 | a | 82.03 | a | 86.25 | b | 97.40 | f | 106.75 | b | 104.30 | a | 106.25 | c | 92.89 | c | 84.33 | d | 74.43 | b | 64.29 | c | 86.25 | a |
1987 | 62.77 | a | 70.35 | b | 74.90 | a | 91.88 | e | 93.38 | b | 105.79 | b | 106.17 | a | 104.79 | c | 99.79 | b | 90.36 | c | 71.11 | b | 60.15 | d | 85.95 | |
1988 | 62.82 | c | 72.11 | b | 79.46 | c | 84.54 | d | 96.00 | e | 104.65 | d | 108.52 | b | 103.14 | c | 97.74 | c | 93.96 | c | 74.19 | d | 64.27 | a | 86.78 | |
1989 | 62.93 | d | 71.46 | b | 84.27 | e | 93.21 | a | 95.47 | a | 104.43 | 110.23 | e | 104.13 | 100.83 | 87.81 | 76.93 | 66.90 | 88.22 | |||||||
1990 | 63.94 | 67.93 | 79.68 | 87.63 | 92.90 | 106.24 | a | 106.21 | b | 103.39 | 99.31 | a | 89.87 | 75.70 | 60.16 | 86.08 | ||||||||||
1991 | 62.84 | 76.68 | 70.06 | 84.14 | a | 91.10 | 99.47 | 107.00 | a | 105.42 | 99.50 | 90.68 | 73.45 | a | 64.29 | 85.38 | ||||||||||
1992 | 63.65 | 70.97 | 73.32 | 88.77 | 94.97 | 102.07 | 105.39 | 104.97 | 101.30 | 88.90 | 70.13 | 58.90 | a | 85.28 | ||||||||||||
1993 | 62.00 | 65.68 | 77.52 | 86.67 | 95.45 | 102.43 | 105.55 | 104.57 | a | 100.77 | 88.16 | 70.57 | 65.13 | 85.37 | ||||||||||||
1994 | 68.06 | 66.86 | 79.71 | 87.10 | 92.10 | 108.07 | 108.90 | a | 108.16 | 101.83 | 85.48 | 67.43 | 63.74 | 86.45 | ||||||||||||
1995 | 62.84 | 74.36 | 75.10 | 82.60 | 88.26 | 101.20 | 108.58 | 109.33 | a | 103.00 | 90.74 | 81.57 | 68.55 | 87.18 | ||||||||||||
1996 | 69.10 | 74.48 | 79.97 | 89.00 | 97.16 | 107.33 | 110.00 | 107.84 | 97.43 | 87.93 | a | 75.37 | 67.06 | 88.56 | ||||||||||||
1997 | 66.74 | 69.89 | 85.13 | 84.30 | 101.03 | 101.63 | 107.13 | 107.13 | 99.30 | 86.61 | 74.40 | 60.97 | 87.02 | |||||||||||||
1998 | 65.77 | 63.18 | 74.45 | 80.37 | 88.77 | 99.47 | 109.94 | 108.77 | 97.13 | 85.84 | 74.17 | 63.61 | 84.29 | |||||||||||||
1999 | 69.00 | 71.61 | 78.61 | 79.53 | 93.55 | 102.43 | 104.10 | 105.70 | a | 100.30 | 93.29 | 80.20 | 66.94 | 87.10 | ||||||||||||
2000 | 69.81 | 73.07 | 77.03 | 91.30 | 100.39 | 105.67 | 108.84 | 105.10 | 101.97 | 84.17 | a | 67.97 | 68.13 | 87.79 | ||||||||||||
2001 | 62.81 | 67.29 | 77.87 | 84.20 | 101.32 | 106.07 | 107.13 | 107.10 | 103.50 | 91.03 | 77.27 | 62.42 | 87.33 | |||||||||||||
2002 | 65.35 | 73.14 | 77.26 | 88.73 | 94.71 | 106.73 | 109.45 | 108.06 | 101.33 | 85.97 | 76.13 | 63.71 | 87.55 | |||||||||||||
2003 | 72.71 | 68.04 | 76.81 | 82.80 | 95.87 | 104.53 | 110.10 | 105.97 | 102.53 | 95.19 | 70.40 | 64.71 | 87.47 | |||||||||||||
2004 | 65.61 | 65.62 | 84.23 | i | 86.03 | 96.55 | 104.90 | 107.61 | 106.45 | 99.69 | a | 82.80 | a | 66.38 | d | 62.67 | a | 85.85 | a | |||||||
2005 | 63.60 | a | 65.32 | 74.29 | 84.69 | a | 95.58 | 103.16 | e | 110.83 | a | 103.90 | 100.21 | a | 87.40 | a | 75.93 | 65.93 | c | 85.90 | ||||||
2006 | 68.48 | 73.43 | 73.30 | a | 85.28 | a | 98.30 | a | 107.15 | d | 110.06 | 105.48 | 97.27 | 85.10 | 77.10 | 64.06 | 87.08 | |||||||||
2007 | 63.39 | 72.29 | 81.55 | 88.14 | a | 97.07 | a | 105.38 | a | 108.31 | b | 107.72 | b | 98.90 | a | 88.10 | a | 78.70 | 60.63 | a | 87.51 | |||||
2008 | 62.10 | 69.15 | i | 79.06 | 86.67 | 91.74 | 107.14 | a | 108.48 | 106.19 | 101.70 | 90.73 | a | 77.43 | 61.43 | a | 88.43 | a | ||||||||
2009 | 67.94 | 68.54 | 79.19 | 85.83 | 100.33 | a | 99.83 | 110.27 | a | 108.45 | 103.20 | 85.48 | 78.03 | a | 60.90 | 87.33 | ||||||||||
2010 | 64.84 | 68.00 | 74.87 | a | 82.93 | 91.17 | a | 104.37 | 109.26 | 106.67 | a | 104.00 | 87.45 | 73.00 | 67.27 | a | 86.15 | |||||||||
2011 | 64.42 | 64.93 | 78.50 | a | 86.00 | 92.29 | 103.70 | 107.60 | a | 110.87 | a | 102.97 | a | 90.45 | b | 72.40 | 60.90 | 86.25 | ||||||||
2012 | 68.58 | 70.93 | 79.03 | 88.41 | a | 99.74 | 107.60 | 106.35 | 107.03 | 101.60 | 89.19 | 77.97 | 63.70 | a | 88.35 | |||||||||||
2013 | 61.69 | b | 67.36 | 82.77 | 88.53 | 96.42 | 109.00 | 108.23 | 106.17 | a | 97.70 | 86.58 | 74.70 | 63.03 | b | 86.85 | ||||||||||
2014 | 70.90 | 76.37 | a | 81.73 | a | 88.27 | 96.87 | a | 106.52 | a | 108.87 | a | 103.50 | a | 100.10 | a | 90.65 | 76.57 | 63.94 | 88.69 | ||||||
2015 | 67.52 | 77.39 | 82.97 | a | 86.77 | 90.43 | a | 107.62 | a | 105.16 | 109.32 | 101.73 | 89.10 | 71.70 | 62.97 | 87.72 | ||||||||||
2016 | 63.97 | 77.07 | 83.26 | 87.53 | 93.71 | 109.72 | a | 111.29 | 106.74 | 98.79 | b | 92.77 | 77.73 | 64.77 | 88.95 | |||||||||||
2017 | 61.69 | b | 71.86 | 82.48 | 88.90 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 76.23 | h | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 65.77 | 71.10 | 77.71 | 85.92 | 94.67 | 104.37 | 108.12 | 106.10 | 100.55 | 89.03 | 74.94 | 65.21 | 87.01 | |||||||||||||
S.D. | 3.51 | 3.77 | 4.24 | 3.73 | 3.73 | 2.82 | 1.88 | 1.95 | 2.59 | 3.72 | 3.44 | 3.75 | 1.31 | |||||||||||||
SKEW | 0.33 | -0.03 | 0.18 | -0.09 | -0.02 | -0.28 | -0.50 | 0.01 | -0.31 | 0.24 | -0.31 | 0.69 | 0.67 | |||||||||||||
MAX | 74.00 | 78.48 | 88.71 | 93.53 | 102.45 | 109.72 | 111.39 | 110.87 | 106.70 | 98.71 | 81.57 | 78.06 | 91.11 | |||||||||||||
MIN | 57.26 | 63.18 | 67.81 | 76.87 | 87.03 | 97.80 | 103.31 | 101.29 | 92.89 | 80.52 | 66.38 | 58.10 | 84.29 | |||||||||||||
YRS | 69 | 67 | 68 | 70 | 68 | 69 | 69 | 67 | 69 | 70 | 70 | 70 | 61 |