YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | 95.35 | 104.97 | 110.35 | 109.32 | ----- | z | 83.29 | 75.20 | 70.71 | 92.74 | e | |||||||
1940 | ----- | z | ----- | z | ----- | z | 87.07 | 101.27 | a | 109.73 | 112.77 | a | 110.77 | ----- | z | 86.03 | 68.50 | 62.60 | a | 92.34 | d | |||||
1941 | 60.63 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 108.61 | 104.42 | 97.27 | ----- | z | 69.97 | 58.61 | 83.25 | f | |||||
1942 | 62.94 | 62.18 | 72.74 | 88.13 | 91.87 | 103.77 | 113.26 | 106.07 | q | 101.07 | 90.00 | 74.80 | 67.00 | 84.34 | a | |||||||||||
1943 | 61.03 | b | 70.79 | 73.74 | ----- | z | 95.87 | 100.79 | b | 109.71 | 106.60 | a | 104.62 | a | 88.10 | a | 73.83 | 62.69 | b | 86.16 | a | |||||
1944 | 58.74 | 61.52 | 70.03 | 80.50 | b | 92.37 | a | 98.64 | b | 109.57 | a | 109.48 | 102.27 | 91.33 | p | 68.55 | a | 65.59 | b | 83.39 | a | |||||
1945 | 59.82 | n | 65.96 | 70.60 | a | 85.23 | 94.77 | a | 99.97 | 111.21 | b | 105.20 | a | 99.37 | c | 85.89 | c | 70.43 | 62.14 | b | 86.43 | a | ||||
1946 | 62.45 | 66.21 | 76.46 | c | 88.76 | a | 94.22 | d | 105.23 | 108.68 | 107.27 | e | 100.83 | 78.58 | 65.14 | b | 62.16 | 84.67 | ||||||||
1947 | 59.06 | 72.07 | 79.06 | 85.47 | 99.77 | a | 102.24 | a | 109.61 | c | 106.10 | 105.03 | 86.74 | 66.70 | 59.03 | 85.91 | ||||||||||
1948 | 62.23 | 58.72 | 67.61 | c | 82.87 | 90.08 | s | ----- | z | 109.96 | f | 107.26 | 102.27 | 87.19 | 67.17 | 57.26 | 76.95 | c | ||||||||
1949 | 45.39 | 58.46 | 71.71 | 86.30 | 91.10 | 101.20 | 108.70 | a | 105.87 | 103.00 | 82.61 | 78.33 | 59.39 | 82.67 | ||||||||||||
1950 | 57.39 | 69.21 | 74.68 | 87.77 | 91.94 | 101.53 | 107.52 | 106.73 | a | 97.27 | 89.90 | 73.43 | 66.58 | 85.33 | ||||||||||||
1951 | 58.90 | 62.75 | 70.84 | 81.10 | 89.81 | 99.97 | 108.61 | 103.23 | 100.63 | 81.97 | 66.60 | 55.00 | 81.62 | |||||||||||||
1952 | 54.26 | 63.66 | 63.86 | b | 81.33 | 93.65 | 98.80 | ----- | z | 108.55 | b | 99.34 | a | 92.53 | a | 66.15 | d | 60.67 | d | 80.25 | a | |||||
1953 | 64.03 | 65.64 | 76.03 | 82.57 | 84.93 | a | 102.07 | 109.68 | 107.13 | 104.00 | 85.84 | 72.67 | 59.93 | a | 84.54 | |||||||||||
1954 | 59.35 | 72.36 | 68.97 | a | 88.87 | 96.81 | 101.00 | 110.06 | 105.37 | a | 100.97 | 89.40 | a | 75.77 | 60.16 | 85.76 | ||||||||||
1955 | 53.87 | 59.82 | 73.17 | b | 78.90 | 89.97 | 100.77 | 106.40 | a | 104.37 | d | 100.12 | d | 90.07 | b | 71.03 | a | 65.21 | b | 82.81 | ||||||
1956 | 64.07 | d | 62.00 | a | 75.55 | 82.24 | a | 92.13 | 104.20 | 105.23 | 104.84 | 103.37 | 86.19 | 69.77 | 64.23 | 84.48 | ||||||||||
1957 | 58.71 | 72.04 | 75.23 | 80.37 | 87.39 | 103.69 | a | 107.84 | 104.53 | a | 99.27 | 81.26 | 65.00 | 63.10 | 83.20 | |||||||||||
1958 | 62.58 | 66.79 | 66.35 | 77.77 | 94.03 | 100.57 | 106.58 | 107.48 | 99.13 | 89.67 | a | 69.83 | a | 65.61 | 83.87 | |||||||||||
1959 | 61.06 | 62.36 | 74.13 | 86.13 | 89.71 | 104.97 | 110.35 | 104.52 | 96.97 | a | 87.10 | 70.47 | 61.97 | 84.14 | ||||||||||||
1960 | 55.06 | 61.07 | 75.39 | 84.27 | 93.13 | 107.07 | a | 109.74 | 106.84 | 100.17 | 84.10 | 68.90 | 60.29 | 83.83 | ||||||||||||
1961 | 62.61 | 67.18 | 72.55 | 82.77 | 90.71 | 105.40 | 109.58 | 105.39 | 95.07 | 84.37 | a | 68.26 | c | 59.24 | b | 83.59 | ||||||||||
1962 | 61.00 | 67.04 | c | 69.14 | b | 90.79 | b | 90.27 | a | 102.43 | b | 106.97 | b | 107.63 | a | 101.80 | 89.55 | b | 76.04 | c | 64.71 | g | 87.51 | a | ||
1963 | 58.71 | g | 72.12 | d | 72.84 | f | 78.32 | h | 95.84 | f | 97.87 | g | 106.83 | b | 103.57 | c | 99.44 | e | 91.67 | g | 72.58 | d | 63.71 | g | 90.91 | g |
1964 | 61.68 | f | ----- | z | 72.00 | g | 81.88 | f | 90.40 | k | 99.00 | g | 107.93 | c | 104.69 | e | 96.29 | f | 91.26 | 63.94 | n | 60.69 | b | 91.14 | h | |
1965 | 64.84 | l | 69.00 | f | 70.52 | h | 79.55 | h | 87.83 | h | 95.62 | f | 105.77 | i | 104.85 | k | 94.30 | g | 89.41 | b | 72.27 | o | 58.78 | h | 89.41 | k |
1966 | 59.14 | j | 62.10 | h | 77.48 | h | 84.60 | j | 95.71 | j | 101.52 | i | 107.10 | k | 106.78 | h | 97.65 | j | 85.15 | e | 72.23 | h | 61.90 | k | 85.15 | k |
1967 | 61.70 | k | 67.95 | h | 76.22 | d | 73.79 | f | 89.26 | h | 95.90 | j | 107.74 | h | 106.85 | e | 97.44 | c | 87.45 | 72.46 | b | 55.40 | a | 82.64 | f | |
1968 | 61.23 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.23 | k |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 74.10 | 79.13 | 90.50 | a | 104.23 | 111.69 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 91.93 | g | |||
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 | 67.83 | 70.03 | 86.97 | 92.26 | 99.87 | 105.10 | 106.81 | 101.70 | 87.61 | 67.40 | 56.23 | 85.62 | a | |||||||||||
1993 | 56.45 | 63.14 | 74.65 | 83.77 | 92.55 | 99.27 | 105.16 | 106.61 | 99.93 | 85.39 | 64.00 | 61.68 | 82.72 | |||||||||||||
1994 | 64.35 | 62.61 | 79.45 | 84.10 | 92.35 | 109.07 | 111.65 | 110.03 | 100.37 | 82.87 | 63.90 | 61.00 | 85.15 | |||||||||||||
1995 | 58.74 | 75.54 | 73.10 | 80.80 | 87.19 | 99.40 | 111.42 | 110.48 | 102.57 | 88.39 | 77.77 | 64.84 | 85.85 | |||||||||||||
1996 | 63.87 | 71.14 | 78.52 | 87.27 | 96.06 | 107.60 | 111.19 | 110.06 | 97.33 | 84.06 | 70.73 | 60.58 | 86.54 | |||||||||||||
1997 | 60.81 | 67.61 | 81.81 | 82.67 | 100.97 | 102.00 | 107.19 | 107.26 | 97.17 | 84.61 | 71.73 | 60.35 | 85.35 | |||||||||||||
1998 | 62.42 | 61.43 | 72.58 | 77.50 | 87.84 | 98.70 | 108.77 | a | 108.45 | 96.90 | 82.94 | 69.83 | 62.03 | 82.45 | ||||||||||||
1999 | 66.26 | 68.25 | 78.32 | 74.87 | 92.42 | 103.13 | 105.65 | 106.29 | 99.13 | 89.87 | 75.67 | 64.43 | a | 85.36 | ||||||||||||
2000 | 65.06 | 66.86 | 74.35 | 89.33 | 98.68 | 106.77 | 110.58 | 107.74 | 101.60 | 79.25 | k | 66.23 | 64.77 | 86.54 | a | |||||||||||
2001 | 60.94 | 65.43 | 76.74 | 82.67 | 100.84 | 105.50 | 108.97 | 109.74 | 104.00 | 88.83 | a | 74.94 | m | 58.74 | 87.49 | a | ||||||||||
2002 | 61.90 | a | 70.82 | 73.87 | 88.10 | 95.48 | 107.73 | 112.81 | 108.23 | 100.10 | 84.35 | 73.03 | 61.77 | 86.52 | ||||||||||||
2003 | 70.97 | 65.71 | 74.94 | 79.23 | 95.45 | 105.90 | a | 113.68 | 106.53 | a | 102.47 | 94.33 | a | 67.50 | 61.84 | 86.55 | ||||||||||
2004 | 63.94 | 62.69 | 84.16 | 84.28 | a | 96.06 | 106.07 | a | 110.48 | 106.23 | 98.37 | 83.97 | b | 66.37 | 61.65 | 85.35 | ||||||||||
2005 | 62.48 | 65.00 | 73.77 | 82.10 | a | 95.03 | 102.10 | 112.10 | 105.26 | 99.20 | 86.55 | 74.57 | 64.13 | a | 85.19 | |||||||||||
2006 | 65.77 | 71.07 | 70.23 | 85.30 | 98.97 | b | 107.72 | a | 110.06 | 106.32 | 97.73 | 81.19 | 74.90 | 61.48 | 85.90 | |||||||||||
2007 | 60.32 | 69.93 | 80.90 | 85.83 | 95.90 | 106.03 | 111.80 | a | 108.29 | 98.70 | 86.03 | 76.97 | 57.52 | 86.52 | ||||||||||||
2008 | 58.10 | 65.21 | 76.03 | 83.47 | 89.90 | 105.57 | 109.35 | 108.77 | 102.00 | 88.45 | 74.07 | 56.48 | 84.78 | |||||||||||||
2009 | 65.40 | a | 65.04 | 75.47 | a | 81.70 | 99.68 | 97.73 | 111.35 | 107.39 | 103.17 | 82.68 | 75.13 | 58.45 | 85.27 | |||||||||||
2010 | 61.39 | 65.82 | 72.45 | 79.43 | 87.06 | 103.20 | 111.87 | 107.26 | 103.37 | 85.61 | 70.43 | 63.10 | 84.25 | |||||||||||||
2011 | 61.42 | 63.89 | 72.58 | 81.43 | 85.48 | 102.10 | 108.23 | 109.77 | 102.33 | 85.52 | 67.20 | 58.77 | 83.23 | |||||||||||||
2012 | 64.23 | 66.86 | 74.10 | 84.70 | 96.81 | 105.83 | 107.81 | 107.52 | 101.07 | 86.03 | 74.03 | 58.45 | 85.62 | |||||||||||||
2013 | 56.94 | 63.46 | 77.16 | 83.60 | 92.55 | 106.43 | 107.97 | 104.26 | 94.50 | 81.26 | 70.73 | 58.16 | 83.09 | |||||||||||||
2014 | 65.77 | 68.64 | 75.68 | 83.10 | 92.06 | 103.97 | 107.55 | 101.35 | 99.77 | 88.03 | 71.37 | 59.71 | 84.75 | |||||||||||||
2015 | 62.77 | 71.82 | 79.19 | 82.63 | 87.26 | 106.70 | 104.35 | 106.61 | 101.30 | 86.77 | 67.23 | 56.68 | 84.44 | |||||||||||||
2016 | 57.13 | 70.55 | 76.84 | 80.63 | 88.23 | 107.67 | 109.39 | 104.48 | 96.70 | 86.90 | 73.60 | 57.84 | 84.16 | |||||||||||||
2017 | 57.39 | 66.54 | 79.10 | 81.93 | 91.39 | 107.17 | 109.65 | 105.81 | 95.83 | 85.65 | 75.43 | 64.32 | 85.02 | |||||||||||||
2018 | 65.16 | 66.46 | 72.19 | 87.90 | 92.81 | 106.33 | 110.42 | 107.94 | 102.27 | 81.23 | 69.97 | 60.10 | 85.23 | |||||||||||||
2019 | 59.29 | 56.46 | 72.48 | 85.70 | 85.29 | 103.10 | 110.26 | 110.58 | 100.20 | 82.65 | 73.00 | 56.61 | 82.97 | |||||||||||||
2020 | 63.42 | 65.93 | 69.52 | 80.63 | 94.68 | 101.30 | 108.42 | 110.23 | 101.70 | 89.61 | 72.80 | 60.81 | 84.92 | |||||||||||||
2021 | 60.97 | 65.71 | 69.87 | 84.43 | 92.73 | a | 106.93 | 108.00 | 106.00 | 100.27 | 80.87 | 76.37 | 60.61 | 84.40 | ||||||||||||
2022 | 62.26 | 66.21 | 75.19 | 83.50 | 91.94 | 103.20 | 107.55 | 103.84 | 100.43 | 86.94 | 64.43 | 59.32 | 83.73 | |||||||||||||
2023 | 57.26 | 61.25 | 64.81 | 81.00 | 92.16 | 96.63 | 112.19 | 102.90 | 95.30 | 85.94 | 70.97 | 64.10 | 82.04 | |||||||||||||
2024 | 59.52 | 63.97 | 71.77 | 81.80 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 69.26 | h | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 60.91 | 65.98 | 73.93 | 83.47 | 92.90 | 103.53 | 109.27 | 106.78 | 100.15 | 86.12 | 70.96 | 61.08 | 84.51 | |||||||||||||
S.D. | 3.93 | 4.04 | 4.01 | 3.33 | 4.04 | 3.15 | 2.19 | 2.13 | 2.52 | 3.20 | 3.80 | 3.17 | 1.28 | |||||||||||||
SKEW | -0.98 | 0.03 | -0.09 | -0.02 | 0.14 | -0.14 | -0.16 | -0.06 | -0.26 | 0.04 | -0.06 | 0.42 | -0.33 | |||||||||||||
MAX | 70.97 | 75.54 | 84.16 | 90.79 | 101.27 | 109.73 | 113.68 | 110.77 | 105.03 | 94.33 | 78.33 | 70.71 | 86.55 | |||||||||||||
MIN | 45.39 | 56.46 | 63.86 | 74.87 | 84.93 | 96.63 | 104.35 | 101.35 | 94.50 | 78.58 | 63.90 | 55.00 | 81.62 | |||||||||||||
YRS | 54 | 55 | 56 | 55 | 55 | 55 | 57 | 58 | 56 | 57 | 57 | 57 | 43 |