YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | 83.68 | e | 91.87 | 103.53 | 104.58 | 101.77 | 94.57 | 87.48 | 70.93 | 64.48 | 89.21 | c | ||||||||
1962 | 62.90 | 68.50 | 68.55 | 88.70 | 89.58 | 100.30 | 103.90 | 106.58 | 97.60 | 88.81 | 80.10 | 69.29 | 85.40 | |||||||||||||
1963 | 62.81 | 74.54 | 73.90 | 79.77 | 95.42 | 97.47 | 105.52 | 98.48 | 99.73 | 91.32 | 74.50 | 68.90 | 85.20 | |||||||||||||
1964 | 63.81 | 65.90 | 69.68 | 80.27 | 90.39 | 98.93 | 104.68 | 98.35 | 95.30 | 92.29 | 70.73 | 65.74 | 83.01 | |||||||||||||
1965 | 65.29 | 67.25 | 70.45 | 79.23 | 88.81 | 95.33 | 104.23 | 103.58 | 95.70 | 91.77 | 78.17 | 64.13 | 83.66 | |||||||||||||
1966 | 61.84 | 62.93 | 77.13 | 86.27 | 95.29 | 101.73 | 105.23 | 103.23 | 96.53 | 87.13 | 77.53 | 66.71 | 85.13 | |||||||||||||
1967 | 66.39 | 72.93 | 78.74 | 76.63 | 90.61 | 96.67 | 102.97 | 103.61 | 97.53 | 91.32 | 79.87 | 61.35 | 84.89 | |||||||||||||
1968 | 65.84 | 72.17 | 73.52 | 80.37 | 92.06 | 102.53 | 102.84 | 98.87 | 99.27 | 89.39 | 74.27 | 62.74 | 84.49 | |||||||||||||
1969 | 66.84 | 65.79 | 70.16 | 84.17 | 94.42 | 98.70 | 104.94 | 106.58 | 100.33 | 84.55 | 73.97 | 68.10 | 84.88 | |||||||||||||
1970 | 66.06 | 72.89 | 71.71 | 78.17 | 94.77 | 102.43 | 106.19 | 104.77 | 95.07 | 83.81 | 77.13 | 65.77 | 84.90 | |||||||||||||
1971 | 67.48 | 71.00 | 78.45 | 81.20 | 88.23 | 100.13 | 104.68 | 100.23 | 98.57 | 80.84 | 73.57 | 61.71 | 83.84 | |||||||||||||
1972 | 68.10 | 74.90 | 87.45 | 85.87 | 93.58 | 100.43 | 106.45 | 101.87 | 98.53 | 82.77 | 68.37 | 63.35 | 85.97 | |||||||||||||
1973 | 60.97 | 66.00 | 64.84 | 79.00 | 92.77 | 102.33 | 104.61 | 104.42 | 99.03 | 91.00 | 74.77 | 68.93 | d | 84.06 | ||||||||||||
1974 | 64.32 | 70.43 | 76.35 | 82.70 | 92.26 | 104.60 | 101.48 | 101.35 | 96.73 | 85.03 | 72.73 | 61.52 | 84.13 | |||||||||||||
1975 | 64.42 | 65.14 | 69.35 | 73.67 | 87.90 | 98.13 | 101.84 | 103.00 | 96.57 | 87.03 | 76.30 | 65.77 | 82.43 | |||||||||||||
1976 | 66.06 | 69.83 | 73.10 | 79.37 | 91.35 | 100.62 | a | 101.03 | 101.97 | 92.20 | 82.07 | a | 75.46 | b | 66.74 | 83.32 | ||||||||||
1977 | 62.55 | 73.46 | 70.84 | 84.20 | 85.74 | 103.10 | 104.81 | 103.68 | 97.23 | 89.58 | 82.43 | w | 71.31 | b | 86.05 | a | ||||||||||
1978 | 62.14 | j | 66.82 | ----- | z | 81.13 | 92.48 | 104.23 | 105.97 | 102.43 | c | 98.07 | 91.84 | 71.97 | 63.42 | e | 87.84 | b | ||||||||
1979 | 58.26 | 67.27 | b | 69.52 | 82.23 | 85.06 | 100.93 | b | 104.90 | 101.33 | a | 102.59 | a | 90.84 | 71.14 | b | 69.68 | 83.65 | ||||||||
1980 | 65.26 | 69.68 | a | 70.71 | 82.03 | 87.48 | 102.80 | 105.77 | 101.48 | 98.70 | 86.97 | 77.33 | 73.84 | 85.17 | ||||||||||||
1981 | 69.13 | 73.29 | 71.93 | c | 85.45 | a | 88.94 | 103.57 | 103.23 | a | 104.47 | a | 98.60 | 83.84 | 78.57 | 69.87 | a | 85.91 | ||||||||
1982 | 63.61 | 68.07 | 70.74 | 82.66 | a | 89.97 | 99.10 | 102.45 | 102.07 | a | 96.97 | 86.23 | 70.41 | a | 62.79 | b | 82.92 | |||||||||
1983 | 66.30 | a | 66.11 | 69.17 | a | 75.83 | 91.13 | 98.73 | 103.84 | 100.00 | 99.80 | 84.55 | 72.63 | 64.90 | 82.75 | |||||||||||
1984 | 66.97 | 70.79 | 78.94 | 79.70 | 97.13 | a | 99.57 | 99.90 | 99.74 | 97.37 | 81.65 | 73.30 | 62.61 | 83.97 | ||||||||||||
1985 | 62.94 | 65.96 | 71.97 | 85.43 | 93.26 | 103.50 | 104.13 | ----- | z | 91.67 | 84.00 | 72.83 | f | 66.68 | 82.95 | b | ||||||||||
1986 | 73.29 | 69.64 | 77.70 | a | 84.20 | 92.32 | 102.55 | a | 100.21 | b | 102.74 | 92.60 | 83.97 | 73.30 | 65.13 | 84.80 | ||||||||||
1987 | 64.68 | 67.32 | 72.52 | 88.60 | 91.29 | 103.43 | 104.77 | 102.32 | 96.47 | 90.81 | 72.47 | 61.52 | 84.68 | |||||||||||||
1988 | 63.77 | 72.61 | a | 78.19 | 82.37 | 92.58 | 103.10 | 104.06 | 100.68 | 97.20 | 92.81 | 76.07 | 66.68 | 85.84 | ||||||||||||
1989 | 65.29 | 71.29 | 81.97 | a | 91.70 | 93.77 | 101.47 | 106.00 | 101.06 | 99.97 | 88.10 | 78.90 | 69.13 | 87.39 | ||||||||||||
1990 | 66.39 | 66.39 | 78.19 | 84.27 | 90.61 | 104.37 | 101.84 | 99.19 | 97.37 | 90.52 | 76.20 | 62.39 | 84.81 | |||||||||||||
1991 | 65.26 | 75.93 | 67.79 | b | 81.37 | 89.68 | 96.67 | 102.97 | a | 102.45 | 95.87 | 90.77 | 73.07 | 63.84 | 83.80 | |||||||||||
1992 | 63.81 | 69.66 | 72.07 | b | 86.33 | 91.87 | 99.27 | 100.74 | 99.97 | 99.23 | 91.10 | 72.10 | 62.39 | 84.04 | ||||||||||||
1993 | 65.35 | 66.04 | 75.23 | 84.63 | 93.04 | d | 100.73 | 101.26 | 101.61 | 98.40 | 87.65 | 72.50 | 67.93 | b | 84.53 | |||||||||||
1994 | 70.21 | b | 67.93 | 77.21 | c | 84.53 | 88.93 | b | 104.82 | b | 105.31 | e | 105.30 | a | 99.00 | c | 84.00 | d | 73.11 | k | 67.95 | i | 88.72 | b | ||
1995 | 64.36 | f | 75.72 | j | 76.05 | i | 83.44 | l | 87.80 | p | 102.53 | o | 106.79 | l | 105.05 | k | 102.06 | l | 92.05 | j | 81.69 | q | 73.72 | m | ----- | z |
1996 | 69.50 | k | 74.11 | j | 78.85 | k | 88.14 | h | 96.45 | k | 105.42 | k | 104.20 | k | 104.70 | k | 92.56 | e | 86.84 | 77.37 | 69.94 | 81.68 | h | |||
1997 | 65.13 | 70.61 | 82.52 | 81.07 | 97.23 | 98.93 | 104.71 | 102.00 | a | 100.21 | a | 85.90 | 76.45 | a | 63.29 | 85.67 | ||||||||||
1998 | 67.58 | 62.75 | 73.22 | d | 76.60 | 88.10 | 97.00 | a | 105.29 | 104.71 | 98.43 | b | 86.77 | 76.90 | 68.36 | f | 85.21 | a | ||||||||
1999 | 71.10 | 73.12 | d | 77.87 | 77.10 | 91.13 | 100.07 | 101.42 | 103.26 | 98.57 | 93.71 | 83.47 | 69.39 | 86.68 | ||||||||||||
2000 | 72.53 | a | 74.14 | 74.83 | a | 89.53 | 97.39 | 102.93 | 105.81 | 103.13 | a | 102.07 | 82.52 | 69.27 | 70.23 | 87.03 | ||||||||||
2001 | 63.90 | b | 68.33 | a | 77.00 | 84.41 | a | 98.42 | 103.37 | 103.03 | 102.81 | 102.33 | 89.58 | 78.40 | 65.23 | a | 86.40 | |||||||||
2002 | 67.68 | 74.79 | 77.06 | 88.07 | 93.97 | 104.90 | 104.97 | 103.67 | a | 99.23 | 85.55 | 78.92 | d | 65.47 | a | 87.02 | ||||||||||
2003 | 76.32 | 69.21 | 75.61 | 81.43 | 94.32 | 102.50 | 106.81 | 104.26 | 101.07 | b | 94.84 | 74.60 | 69.42 | 87.53 | ||||||||||||
2004 | 69.19 | 67.93 | 85.23 | 86.63 | 95.94 | 103.23 | 105.13 | 102.65 | 98.43 | 86.63 | a | 71.10 | 68.16 | 86.69 | ||||||||||||
2005 | 66.65 | 67.71 | 74.13 | 85.37 | 93.61 | 101.73 | 107.65 | 100.81 | 99.23 | 89.32 | 79.63 | 72.42 | 86.52 | |||||||||||||
2006 | 73.19 | 75.96 | 72.32 | 84.57 | 97.52 | 105.87 | 105.37 | a | 101.27 | a | 95.07 | 86.71 | 80.93 | 67.45 | 87.19 | |||||||||||
2007 | 64.52 | 72.32 | 82.63 | a | 85.73 | 95.32 | 104.10 | 105.50 | a | 104.61 | 99.69 | a | 89.58 | 83.50 | 64.03 | 87.63 | ||||||||||
2008 | 66.24 | b | 68.38 | 79.32 | 85.62 | d | ----- | z | 104.70 | 103.87 | 102.13 | 99.67 | 89.96 | d | 80.36 | b | 66.82 | c | 86.10 | a | ||||||
2009 | 69.52 | 71.21 | 76.14 | b | 85.68 | k | 98.58 | l | 100.39 | l | 108.73 | e | 106.17 | m | 99.25 | r | ----- | z | ----- | z | ----- | z | 81.40 | h | ||
2010 | 72.00 | q | 66.00 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.14 | x | ----- | z |
2012 | 71.95 | i | 72.35 | i | 79.16 | l | 87.74 | k | 96.72 | m | 104.85 | j | 104.33 | m | 104.20 | k | 97.72 | l | 91.86 | i | 81.47 | m | 70.00 | n | ----- | z |
2013 | 64.85 | k | 68.00 | i | 81.52 | j | 85.32 | h | 93.82 | n | 104.68 | k | 104.50 | i | 102.90 | j | 98.85 | j | 87.09 | i | 78.50 | n | 68.45 | i | ----- | z |
2014 | 74.14 | i | 75.71 | k | 81.05 | l | 86.62 | i | 93.50 | o | 103.95 | k | 105.00 | i | 99.52 | j | 97.61 | l | 88.47 | n | 77.47 | m | 70.53 | l | ----- | z |
2015 | 71.11 | l | 76.65 | h | 81.19 | j | 84.95 | i | 89.81 | o | 104.32 | h | 103.00 | i | 105.18 | n | 98.16 | k | 87.53 | n | 76.69 | q | 67.00 | m | ----- | z |
2016 | 65.19 | o | 76.89 | j | 83.29 | n | 86.00 | k | 91.78 | m | 105.75 | j | 107.37 | l | 102.29 | j | 95.54 | q | 93.06 | n | 78.73 | o | 69.50 | o | ----- | z |
2017 | 65.59 | i | 74.83 | j | 85.69 | o | 86.65 | m | 93.67 | p | 109.41 | m | 105.47 | l | 103.88 | o | 98.89 | k | 94.71 | n | 83.93 | p | ----- | z | ----- | z |
2018 | 74.71 | q | 73.63 | i | 78.12 | o | 91.67 | l | 95.33 | p | 105.78 | l | 107.50 | s | 103.40 | k | 99.62 | v | 83.00 | n | 78.00 | p | 69.47 | p | ----- | z |
2019 | 67.38 | o | 64.50 | p | 77.57 | q | 88.40 | o | 85.60 | p | 102.67 | l | 107.00 | k | 106.63 | l | 98.12 | n | 87.29 | n | 81.09 | s | 67.50 | q | ----- | z |
2020 | 68.77 | r | 71.50 | q | 75.90 | u | 84.27 | s | 98.93 | q | 104.22 | l | 108.25 | s | 110.94 | o | 102.07 | o | 96.21 | l | 84.35 | m | 70.93 | p | ----- | z |
2021 | 70.07 | q | 75.00 | j | 75.00 | k | 87.26 | k | 96.28 | m | 107.29 | i | 104.05 | k | 103.93 | q | 100.39 | l | 86.59 | n | 85.00 | n | 74.07 | p | ----- | z |
2022 | 70.19 | o | 70.00 | l | 80.00 | u | ----- | z | ----- | z | 104.88 | v | 105.67 | m | 102.00 | j | 98.40 | o | 90.26 | l | 73.85 | q | 65.20 | p | ----- | z |
2023 | 66.45 | t | 65.17 | j | 69.82 | n | 86.10 | j | 98.67 | y | 104.00 | w | 113.25 | w | 105.59 | n | 100.47 | o | 93.15 | r | 80.13 | o | 73.62 | r | ----- | z |
2024 | 65.67 | s | 70.80 | s | 73.93 | p | 83.64 | s | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 66.22 | 69.67 | 74.80 | 82.87 | 92.17 | 101.42 | 104.16 | 102.32 | 97.81 | 87.74 | 75.44 | 66.25 | 85.07 | |||||||||||||
S.D. | 3.45 | 3.39 | 4.81 | 3.87 | 3.18 | 2.60 | 1.94 | 1.97 | 2.51 | 3.48 | 3.69 | 3.18 | 1.44 | |||||||||||||
SKEW | 0.71 | 0.05 | 0.46 | -0.15 | -0.07 | -0.45 | -0.30 | 0.01 | -0.56 | -0.08 | 0.23 | 0.28 | 0.13 | |||||||||||||
MAX | 76.32 | 75.96 | 87.45 | 91.70 | 98.42 | 105.87 | 108.73 | 106.58 | 102.59 | 94.84 | 83.50 | 73.84 | 87.63 | |||||||||||||
MIN | 58.26 | 62.75 | 64.84 | 73.67 | 85.06 | 95.33 | 99.90 | 98.35 | 91.67 | 80.84 | 68.37 | 61.35 | 82.43 | |||||||||||||
YRS | 45 | 46 | 45 | 46 | 45 | 46 | 47 | 45 | 47 | 47 | 44 | 45 | 39 |