YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.33 | a | 64.33 | k |
1943 | 79.05 | k | 74.00 | 75.87 | a | 86.43 | 93.59 | b | 97.44 | e | 99.32 | l | 94.30 | h | 95.89 | b | 86.73 | e | 77.25 | b | 64.00 | g | 85.90 | d | ||
1944 | 63.83 | b | 61.87 | f | 71.21 | g | 78.18 | s | 87.52 | d | 96.52 | i | 101.19 | e | 99.70 | a | 92.73 | 92.21 | q | ----- | z | 65.28 | m | 88.99 | g | |
1945 | 63.64 | c | 69.87 | m | 69.14 | b | 82.21 | f | 91.00 | q | 96.54 | f | 98.41 | d | 94.16 | l | 94.58 | k | 85.61 | 76.40 | 65.62 | e | 76.47 | f | ||
1946 | 61.28 | m | 68.87 | e | 76.48 | b | 87.17 | 88.56 | o | 102.91 | g | ----- | z | 96.23 | a | 94.27 | ----- | z | 72.73 | s | 70.68 | 82.28 | f | |||
1947 | 62.45 | 74.33 | a | 75.73 | e | ----- | z | 92.56 | o | 98.21 | k | 102.82 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.84 | i | |
1948 | ----- | z | ----- | z | 68.95 | k | 85.72 | l | 92.90 | u | 100.94 | l | 99.46 | e | ----- | z | 95.83 | l | 86.75 | s | 73.43 | p | ----- | z | 99.46 | k |
1949 | ----- | z | 61.14 | u | 73.07 | p | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | 78.81 | 87.96 | b | 90.28 | b | 100.93 | a | 95.90 | 100.94 | 95.20 | 95.23 | 81.43 | b | 75.88 | e | 90.26 | b | |||||
1951 | 65.43 | c | 70.56 | a | 74.96 | c | 81.45 | a | 91.48 | 99.07 | b | 103.65 | 98.03 | a | 100.67 | 88.23 | 73.39 | b | 64.07 | a | 84.25 | |||||
1952 | 66.68 | c | 67.79 | a | 66.90 | a | 80.50 | d | 95.11 | d | 100.60 | 101.66 | b | 99.36 | i | 98.76 | i | 95.03 | a | 67.26 | c | 63.90 | b | 80.54 | b | |
1953 | 70.83 | b | 68.85 | a | 75.23 | 80.72 | a | 86.00 | a | 102.74 | c | 99.61 | 102.83 | g | 101.36 | e | 90.50 | o | 78.81 | c | 65.13 | a | 82.93 | b | ||
1954 | 70.33 | g | 76.11 | a | 72.90 | 87.57 | i | 92.45 | 100.46 | b | 98.57 | a | 97.04 | h | 98.37 | c | 91.15 | d | 80.35 | d | 68.73 | e | 86.57 | c | ||
1955 | 59.31 | e | 68.04 | d | 76.83 | a | 82.92 | f | 90.48 | d | 102.27 | h | 98.65 | e | 93.77 | i | 98.22 | g | 92.22 | d | 75.73 | 73.00 | g | 80.18 | e | |
1956 | 74.10 | j | 63.77 | g | 80.32 | f | 84.16 | k | 94.68 | c | 103.91 | g | 100.71 | c | 101.38 | j | 102.62 | d | 88.35 | h | 75.54 | d | 68.32 | i | 93.39 | h |
1957 | 66.23 | e | 75.24 | g | 75.68 | c | 83.57 | b | 88.00 | c | 104.69 | d | 103.00 | c | 98.95 | i | 99.32 | b | 81.59 | d | 68.00 | h | 69.38 | e | 85.72 | c |
1958 | 67.19 | e | 69.88 | b | 67.43 | a | 81.00 | e | 98.29 | j | 105.10 | i | 103.33 | d | 98.00 | i | 93.71 | i | 87.07 | c | 74.54 | d | 75.21 | g | 78.64 | e |
1959 | 72.21 | b | 68.81 | a | 79.27 | e | 88.96 | g | 90.48 | d | 105.04 | e | 101.63 | a | 93.34 | b | 97.55 | j | 88.89 | l | 73.58 | d | 66.14 | c | 83.39 | c |
1960 | 61.79 | c | 65.48 | b | 80.24 | b | 85.17 | f | 93.54 | c | 105.07 | c | 104.00 | 98.74 | 97.69 | d | 85.04 | c | 78.42 | d | 66.20 | f | 87.00 | b | ||
1961 | 67.18 | c | 71.64 | c | 74.89 | l | 85.76 | e | 92.19 | e | 104.14 | b | 101.00 | 97.76 | b | 92.65 | j | 86.55 | 70.24 | a | 62.00 | d | 83.85 | b | ||
1962 | 63.17 | b | 71.04 | a | 69.97 | b | 89.94 | n | 91.79 | b | 99.83 | a | 100.58 | 103.90 | 95.76 | a | 87.26 | 79.41 | a | 68.15 | e | 84.62 | a | |||
1963 | 64.68 | 75.15 | a | 76.30 | a | 82.10 | 95.69 | b | 97.77 | 103.00 | 94.65 | 96.76 | a | 90.73 | a | 75.31 | a | 68.35 | e | 85.04 | ||||||
1964 | 64.63 | a | 65.64 | a | 70.68 | 81.88 | e | 92.66 | b | 100.00 | f | 103.10 | a | 94.83 | b | 92.48 | g | 90.80 | a | 70.82 | b | ----- | z | 81.67 | c | |
1965 | ----- | z | 67.00 | a | 73.00 | 83.41 | a | 89.93 | a | 98.36 | b | 104.16 | 102.42 | 94.57 | 93.23 | a | 78.89 | c | 64.28 | b | 86.30 | a | ||||
1966 | 63.23 | 63.11 | 78.38 | b | 85.12 | d | 94.94 | 102.83 | 103.87 | a | 98.10 | 95.26 | c | 87.65 | e | 78.86 | a | 69.57 | c | 85.08 | ||||||
1967 | 69.60 | a | 73.84 | c | 80.00 | b | 79.62 | a | 90.00 | 96.53 | 98.32 | 98.16 | 95.32 | b | 88.55 | 80.14 | a | 61.65 | h | 86.37 | a | |||||
1968 | 66.34 | b | 72.42 | c | 73.17 | a | 78.59 | a | 91.33 | a | 100.71 | b | 98.87 | 95.42 | 97.52 | c | 89.89 | c | 74.81 | d | 71.89 | l | 85.37 | a | ||
1969 | 68.48 | j | 68.85 | b | 72.28 | b | 85.04 | g | 94.33 | a | 98.97 | a | 100.42 | 101.32 | 96.77 | 84.35 | 73.41 | c | 67.65 | e | 85.83 | b | ||||
1970 | 67.00 | c | 73.46 | b | 71.62 | b | 78.39 | b | 93.67 | a | 101.17 | a | 102.60 | a | 98.93 | a | 91.07 | a | 82.14 | i | 76.69 | q | 65.88 | e | 84.38 | b |
1971 | 68.03 | a | 69.92 | d | 77.95 | i | 81.80 | j | 87.00 | g | 102.56 | n | 101.38 | b | 92.88 | e | 93.44 | c | 79.10 | a | 73.67 | f | 62.67 | j | 84.13 | f |
1972 | 70.04 | h | 73.93 | b | 84.63 | d | 85.60 | j | 89.67 | d | 97.96 | b | 102.18 | c | 97.41 | b | 94.20 | e | 80.42 | e | 68.21 | b | 62.78 | d | 85.14 | b |
1973 | 63.83 | m | 67.95 | f | 64.37 | a | 76.69 | a | 92.47 | a | 99.83 | a | 100.46 | e | 100.14 | b | 97.48 | c | 89.08 | e | 75.50 | f | 70.96 | h | 90.06 | d |
1974 | 65.07 | d | 70.04 | a | 77.23 | e | 83.11 | b | 92.61 | h | 103.64 | b | 97.36 | f | 97.89 | d | 91.82 | h | 82.54 | e | 73.58 | d | 62.41 | d | 79.50 | c |
1975 | 65.60 | f | 68.92 | b | 73.57 | c | 75.54 | f | 88.35 | h | 97.96 | c | 98.00 | g | 100.26 | d | 95.14 | h | 86.38 | g | 75.00 | e | 64.92 | f | 83.14 | g |
1976 | 66.73 | e | 71.95 | g | 73.04 | e | 81.17 | f | 90.31 | b | 100.38 | i | 96.24 | f | 99.32 | f | 91.78 | g | 82.21 | c | 74.87 | g | 67.57 | h | 78.07 | h |
1977 | 62.70 | d | 72.92 | c | 71.61 | c | 82.92 | e | 86.11 | c | 100.52 | a | 99.32 | f | 97.94 | 97.33 | u | 83.95 | i | 76.36 | e | 72.35 | k | 81.38 | d | |
1978 | 64.71 | j | 64.63 | a | 74.96 | d | 79.65 | d | 87.57 | c | 100.74 | c | 98.89 | c | 96.82 | c | 93.71 | f | 87.38 | e | 70.21 | b | 60.57 | h | 84.54 | c |
1979 | 57.71 | c | 67.24 | c | 68.47 | a | 82.50 | f | 86.41 | b | 97.69 | d | 100.07 | b | 95.84 | f | 96.33 | c | 88.23 | e | 71.57 | b | 72.42 | g | 81.53 | c |
1980 | 66.68 | c | 71.08 | d | 71.28 | b | 81.20 | e | 85.43 | h | 102.42 | d | 100.74 | d | 96.72 | b | 96.11 | c | 85.80 | a | 75.54 | d | 75.46 | g | 84.76 | b |
1981 | 68.75 | c | 72.57 | e | 73.04 | f | 85.36 | e | 87.44 | d | 101.67 | 99.29 | c | 98.61 | c | 93.36 | e | 82.47 | a | 79.71 | b | 71.74 | d | 85.54 | a | |
1982 | 65.48 | f | 70.33 | a | 73.03 | a | 84.22 | g | 88.23 | a | 97.18 | b | 97.42 | e | 96.59 | d | 93.86 | b | 85.79 | g | 71.48 | c | 61.97 | b | 83.34 | c |
1983 | 61.33 | y | 68.04 | b | 69.74 | d | 75.56 | c | 89.83 | a | 98.26 | c | 99.31 | b | 93.97 | b | 94.76 | e | 80.23 | e | 73.27 | d | 68.10 | a | 82.82 | a |
1984 | 66.03 | 70.70 | b | 78.18 | c | 80.44 | c | 95.06 | 95.78 | c | 93.61 | 92.23 | 91.41 | a | 78.14 | c | 72.95 | h | 64.72 | b | 82.39 | a | ||||
1985 | 62.73 | e | 67.73 | b | 74.19 | d | 84.14 | b | 89.84 | 100.71 | b | 100.80 | a | 98.23 | 90.36 | b | 83.30 | a | 72.21 | a | 68.35 | e | 82.71 | |||
1986 | 74.66 | b | 71.52 | a | 77.96 | d | 84.03 | a | 93.95 | k | 100.44 | c | 96.23 | a | 97.14 | b | 93.32 | b | 82.87 | 72.23 | 63.97 | 83.13 | a | |||
1987 | 65.55 | b | 67.69 | b | 71.68 | 84.63 | c | 87.97 | b | 101.10 | 100.86 | b | 96.29 | 92.34 | a | 87.84 | 71.83 | 62.00 | a | 82.48 | ||||||
1988 | 64.65 | 71.66 | 75.55 | ----- | z | 90.93 | a | 101.13 | 100.48 | b | 96.87 | a | 94.62 | a | 87.58 | 73.00 | a | 64.41 | b | 83.72 | a | |||||
1989 | 62.23 | 72.12 | b | 81.03 | a | 90.17 | 92.84 | 100.65 | d | 102.45 | b | 97.22 | h | 98.19 | c | 83.14 | c | 75.70 | 65.63 | d | 84.01 | a | ||||
1990 | 64.67 | d | 66.79 | d | 75.20 | a | 82.29 | b | 87.47 | a | 102.87 | 94.26 | d | 93.46 | e | 92.97 | a | 86.74 | 76.61 | b | 62.38 | b | 82.14 | |||
1991 | 63.79 | b | 73.96 | e | 68.68 | c | 80.79 | f | 89.07 | d | 96.74 | c | 98.86 | c | 97.10 | 92.03 | a | 87.67 | d | 74.22 | c | 64.34 | b | 82.41 | a | |
1992 | 61.77 | a | 67.37 | b | 70.04 | c | 85.59 | c | 90.37 | d | 98.10 | a | 97.87 | h | 95.04 | h | 96.09 | h | 87.52 | f | 69.08 | e | 61.26 | 75.45 | d | |
1993 | 63.67 | a | 63.96 | c | 73.33 | a | 83.08 | e | 91.47 | a | 98.80 | 98.68 | 93.62 | e | 92.48 | g | 83.32 | c | 71.56 | c | 67.13 | a | 80.78 | a | ||
1994 | 67.84 | 67.83 | d | 75.62 | b | 81.64 | h | 88.19 | e | 102.11 | b | 101.53 | a | 98.65 | 95.57 | b | 82.50 | a | 68.78 | c | 64.07 | c | 82.97 | a | ||
1995 | 62.21 | b | 71.56 | c | ----- | z | 79.30 | 84.62 | e | 98.00 | d | 102.14 | c | 98.15 | e | 95.07 | c | 89.09 | i | 77.50 | 69.34 | b | 83.79 | b | ||
1996 | 70.03 | a | 71.00 | e | 75.67 | a | 86.21 | f | 94.54 | e | 101.50 | b | 100.19 | e | 97.92 | g | 90.14 | b | 85.35 | e | 76.30 | 69.24 | b | 83.40 | b | |
1997 | 64.26 | 68.21 | d | 79.61 | 79.14 | b | 93.66 | b | 96.20 | 101.50 | c | 97.20 | a | 95.96 | b | 83.70 | a | 74.59 | a | 59.86 | c | 82.82 | ||||
1998 | 68.48 | f | 60.56 | a | 71.55 | b | 76.34 | a | 87.87 | a | 96.50 | 97.53 | a | 96.00 | b | 95.81 | c | 86.54 | c | 76.62 | a | 66.16 | 82.86 | a | ||
1999 | 70.07 | a | 74.32 | 79.00 | d | 76.90 | a | 89.87 | 97.38 | a | 94.97 | b | 96.57 | c | 93.90 | 91.03 | a | 84.00 | b | 66.97 | b | 84.58 | ||||
2000 | 70.43 | c | 75.15 | c | 73.47 | a | 86.28 | a | 95.33 | a | 97.31 | d | 100.61 | 95.84 | 98.81 | d | 80.10 | b | 65.40 | 70.00 | f | 85.34 | a | |||
2001 | 62.37 | a | 65.48 | a | 75.04 | h | 80.07 | c | 94.45 | b | 99.67 | c | 96.48 | f | 97.52 | b | 96.52 | a | 87.17 | b | 75.68 | b | 64.62 | b | 82.35 | b |
2002 | 66.43 | a | 71.15 | b | 74.62 | b | 85.79 | a | 92.21 | c | 102.25 | b | 99.04 | d | 96.96 | c | 94.59 | c | 81.83 | a | 75.47 | 62.14 | c | 83.54 | ||
2003 | 72.85 | d | 66.29 | 71.54 | c | 81.07 | c | 92.10 | 99.36 | b | 100.36 | c | 94.97 | a | 94.56 | e | 88.15 | d | 71.38 | a | 68.68 | c | 83.44 | |||
2004 | 65.13 | a | 64.21 | 81.47 | a | 78.15 | c | 91.67 | d | 98.79 | a | 97.63 | d | 95.59 | d | 92.29 | i | 81.67 | d | 67.33 | f | 64.10 | b | 81.84 | b | |
2005 | 65.17 | b | 63.68 | f | 70.04 | d | 83.50 | f | 90.39 | c | 98.77 | d | 101.48 | b | ----- | z | 91.80 | 84.77 | 76.80 | 68.84 | 83.12 | c | ||||
2006 | 70.88 | e | 73.46 | b | 71.93 | d | 82.62 | d | 94.23 | a | 101.33 | 99.87 | a | 93.70 | a | 89.36 | b | 83.39 | 78.17 | a | 65.86 | b | 83.73 | |||
2007 | 60.87 | a | 69.85 | a | 78.39 | c | ----- | z | 93.65 | 100.83 | 98.79 | b | ----- | z | 95.24 | a | 87.46 | e | 80.34 | a | 61.66 | b | 82.71 | b | ||
2008 | 65.00 | ----- | z | 76.17 | b | ----- | z | 85.18 | n | 101.17 | 94.00 | a | 94.04 | f | 91.87 | 85.65 | 74.90 | 65.11 | l | 84.11 | e | |||||
2009 | 67.96 | g | ----- | z | 75.90 | 80.43 | 92.19 | 93.55 | a | 100.27 | a | 99.61 | c | 95.40 | 84.85 | e | 79.46 | d | 63.18 | i | 89.07 | c | ||||
2010 | 64.83 | b | 62.59 | a | 70.19 | d | 78.07 | c | 86.63 | a | 98.38 | a | 98.40 | a | 96.35 | 96.17 | 83.53 | a | 71.52 | a | 70.79 | c | 81.45 | |||
2011 | 65.61 | 66.96 | 78.93 | c | 83.03 | 87.90 | a | 100.63 | c | 97.86 | c | 98.93 | d | 95.35 | d | 85.90 | b | 70.17 | a | 59.13 | a | 82.53 | ||||
2012 | 69.07 | b | 69.85 | b | 75.80 | a | 84.52 | a | 93.58 | 101.20 | e | 95.06 | 97.13 | a | 90.76 | a | 86.07 | b | 78.61 | b | 64.67 | a | 83.86 | |||
2013 | 61.55 | b | 62.26 | a | 78.65 | 83.57 | b | 90.68 | 102.43 | b | 97.19 | d | 96.07 | d | 93.43 | b | 83.10 | a | 73.93 | a | 63.80 | a | 82.22 | |||
2014 | 70.38 | b | 73.64 | 76.55 | 82.36 | b | 90.03 | a | 101.00 | 98.45 | b | 94.15 | d | 91.81 | d | 86.48 | f | 74.11 | c | 65.78 | d | 83.48 | a | |||
2015 | 64.79 | b | 73.68 | 78.17 | b | 82.00 | 85.93 | b | 100.07 | b | 95.76 | b | 99.61 | 92.13 | 84.27 | a | 71.50 | 63.62 | b | 82.63 | ||||||
2016 | 65.19 | 76.26 | b | 79.13 | 81.67 | 87.97 | 100.79 | a | 101.38 | b | 95.54 | c | 91.42 | d | 90.83 | b | 76.31 | a | 67.22 | d | 84.48 | |||||
2017 | 63.74 | d | 72.46 | b | 82.25 | c | 85.30 | c | 90.50 | g | 102.70 | c | 97.30 | a | 97.24 | b | 94.00 | a | 90.58 | 82.07 | a | 69.52 | b | 85.20 | a | |
2018 | 72.23 | a | 68.60 | c | 75.70 | a | 87.00 | c | 91.89 | c | 101.07 | b | 98.60 | a | 95.31 | b | 95.62 | a | 79.43 | a | 72.93 | b | 64.71 | x | 85.31 | a |
2019 | ----- | z | 61.24 | k | 74.90 | b | 83.81 | c | 84.07 | b | 98.97 | 101.07 | d | 99.52 | b | 92.81 | c | 84.13 | 75.00 | a | 63.26 | 85.75 | b | |||
2020 | 65.39 | 66.90 | 72.45 | 83.90 | a | 94.67 | a | 100.93 | a | 102.61 | 103.73 | a | 97.14 | a | 91.63 | a | 78.55 | a | 66.10 | a | 85.33 | |||||
2021 | 65.68 | 70.68 | 73.26 | 84.57 | b | 91.37 | a | 102.00 | a | 93.29 | c | 94.83 | a | 93.50 | 84.48 | 80.67 | 67.97 | 83.52 | ||||||||
2022 | 66.63 | a | 67.93 | a | 76.26 | 86.96 | d | 93.77 | a | 99.93 | 98.77 | 93.43 | a | 93.80 | 82.55 | b | 69.57 | 64.23 | 82.82 | |||||||
2023 | 63.31 | b | 65.69 | b | 71.32 | 85.11 | b | 90.60 | a | 96.50 | 105.13 | a | 100.00 | a | 97.50 | 88.87 | 76.75 | b | 68.65 | 84.12 | ||||||
2024 | 63.52 | 67.83 | 71.14 | b | 78.06 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 67.49 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 65.72 | 69.60 | 74.63 | 82.51 | 90.84 | 100.03 | 99.75 | 97.20 | 94.86 | 85.98 | 74.97 | 65.81 | 83.47 | |||||||||||||
S.D. | 3.34 | 3.56 | 3.92 | 3.18 | 2.89 | 2.35 | 2.66 | 2.54 | 2.71 | 3.83 | 3.80 | 3.18 | 1.08 | |||||||||||||
SKEW | 0.44 | -0.26 | -0.04 | -0.11 | -0.29 | -0.11 | -0.45 | 0.41 | 0.44 | 0.26 | -0.08 | 0.44 | 0.09 | |||||||||||||
MAX | 74.66 | 76.26 | 84.63 | 90.17 | 95.69 | 105.07 | 105.13 | 103.90 | 102.62 | 95.23 | 84.00 | 75.88 | 85.33 | |||||||||||||
MIN | 57.71 | 60.56 | 64.37 | 75.56 | 84.07 | 93.55 | 93.29 | 92.23 | 89.36 | 78.14 | 65.40 | 59.13 | 81.45 | |||||||||||||
YRS | 64 | 69 | 73 | 56 | 68 | 69 | 71 | 61 | 63 | 66 | 69 | 58 | 21 |