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 | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 106.52 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 106.52 | k | |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.27 | 63.81 | 72.54 | j | ||
1968 | 68.90 | 77.97 | 78.32 | 82.13 | 92.16 | 102.33 | 103.52 | 101.39 | 101.30 | 90.32 | 79.47 | 65.68 | 86.96 | |||||||||||||
1969 | 69.65 | 67.57 | 75.90 | 85.03 | 94.97 | 97.40 | 105.45 | 110.61 | 102.30 | 86.48 | 76.50 | 71.16 | 86.92 | |||||||||||||
1970 | 69.00 | 73.82 | 75.90 | 78.83 | 94.16 | 102.07 | 107.81 | 105.65 | 99.93 | 87.10 | 78.33 | 65.71 | 86.53 | |||||||||||||
1971 | 69.48 | 74.79 | 79.84 | 82.03 | 86.29 | 99.43 | 109.23 | 104.48 | 101.20 | 83.39 | 75.43 | 62.35 | 85.66 | |||||||||||||
1972 | 68.48 | 77.48 | 88.52 | 86.93 | 93.93 | a | 101.43 | 109.77 | 103.35 | 98.30 | 82.74 | 71.70 | 66.00 | 87.39 | ||||||||||||
1973 | 65.13 | 68.89 | 70.03 | 83.40 | 95.84 | 105.13 | 107.94 | 105.39 | 100.27 | 91.68 | 76.73 | 72.74 | 86.93 | |||||||||||||
1974 | 65.35 | 72.93 | 78.45 | 84.27 | 93.45 | 107.00 | 104.87 | 106.06 | 102.03 | 88.94 | 78.07 | 67.52 | 87.41 | |||||||||||||
1975 | 72.55 | 69.79 | 74.03 | 74.27 | 91.55 | 101.37 | 106.45 | 107.32 | 101.20 | 87.35 | 79.20 | 71.39 | 86.37 | |||||||||||||
1976 | 72.39 | 72.62 | 75.68 | 80.70 | 95.03 | a | 102.40 | 106.06 | 104.03 | 93.53 | 89.23 | 80.60 | 72.97 | 87.10 | ||||||||||||
1977 | 68.03 | a | 80.25 | 74.10 | 87.57 | 83.61 | 104.73 | 108.94 | 104.52 | 99.60 | 92.55 | 81.90 | 72.61 | 88.20 | ||||||||||||
1978 | 65.65 | 69.89 | 77.16 | 80.13 | 92.74 | 105.17 | 108.84 | 105.87 | 99.47 | 95.77 | 74.77 | 65.23 | 86.72 | |||||||||||||
1979 | 61.06 | 69.54 | 74.26 | 85.80 | 91.13 | 103.77 | 107.68 | 102.16 | 106.20 | 93.52 | 76.37 | 74.32 | 87.15 | |||||||||||||
1980 | 69.77 | 72.54 | a | 72.58 | 83.60 | 85.45 | 101.77 | 109.77 | 106.29 | 102.13 | 92.61 | 81.63 | 77.32 | 87.96 | ||||||||||||
1981 | 74.00 | 75.36 | 74.13 | 87.03 | 92.39 | 108.40 | 108.90 | 109.42 | 102.40 | 85.81 | 80.93 | 74.06 | 89.40 | |||||||||||||
1982 | 65.74 | 73.75 | 73.06 | 83.43 | 91.13 | 98.40 | 104.45 | 104.77 | 96.83 | 87.87 | 72.90 | 66.00 | 84.86 | |||||||||||||
1983 | 70.65 | 69.36 | 71.97 | 77.13 | 93.19 | 99.83 | 106.45 | 100.06 | 100.10 | 88.10 | 76.40 | 69.97 | 85.27 | |||||||||||||
1984 | 72.39 | 75.03 | 81.65 | 84.07 | 100.03 | 100.60 | 103.16 | 103.42 | 101.53 | 84.90 | 74.17 | 63.13 | 87.01 | |||||||||||||
1985 | 65.65 | 69.54 | 75.42 | 89.00 | 95.26 | 105.40 | 107.84 | 108.29 | 93.10 | a | 88.19 | 72.93 | a | 70.29 | 86.74 | |||||||||||
1986 | 75.55 | 73.89 | a | 81.87 | 84.47 | 94.73 | a | 106.33 | 103.58 | 107.58 | 94.87 | 86.87 | a | 79.17 | 70.06 | 88.25 | ||||||||||
1987 | 68.87 | 72.39 | 75.39 | 91.57 | 94.81 | 105.77 | 105.90 | 107.29 | 103.67 | 93.06 | 76.10 | a | 64.81 | 88.30 | ||||||||||||
1988 | 69.77 | 77.14 | a | 82.90 | 85.30 | 94.86 | b | 102.43 | b | 109.73 | a | 107.32 | 102.27 | 98.13 | 80.63 | 71.29 | 90.15 | |||||||||
1989 | 67.84 | 72.71 | 86.39 | 95.55 | a | 95.61 | 105.00 | 112.03 | 107.19 | 103.97 | 93.27 | a | 84.27 | 74.52 | 91.53 | |||||||||||
1990 | 71.42 | 73.14 | 83.60 | a | 89.43 | 93.45 | 107.27 | 110.81 | 106.81 | 104.70 | 94.93 | a | 81.97 | 69.19 | 90.56 | |||||||||||
1991 | 70.83 | a | 81.96 | 72.42 | 86.33 | 92.71 | 100.73 | 108.33 | a | 107.65 | 103.53 | 97.26 | 81.67 | 69.80 | a | 89.44 | ||||||||||
1992 | 70.42 | 75.75 | a | 75.65 | 93.20 | 98.39 | 101.37 | 103.55 | 104.26 | 101.53 | 89.06 | 74.30 | 61.71 | 87.43 | ||||||||||||
1993 | 62.26 | 65.96 | c | 81.22 | h | 87.83 | 92.42 | 99.93 | 103.35 | 103.45 | 99.90 | 88.77 | 73.53 | 68.32 | 85.98 | a | ||||||||||
1994 | 72.47 | a | 66.82 | 78.71 | 84.38 | a | 89.07 | a | 105.73 | 106.39 | 105.74 | 100.43 | 86.19 | 69.03 | 67.23 | a | 86.02 | |||||||||
1995 | 64.52 | 76.57 | 75.68 | 82.33 | 85.61 | 100.50 | 107.39 | 109.29 | 102.43 | 92.45 | 83.83 | 72.39 | 87.75 | |||||||||||||
1996 | 72.29 | 74.21 | 80.17 | b | 89.10 | 96.40 | a | 104.50 | 108.16 | 107.16 | 98.30 | 88.42 | 78.69 | a | 70.37 | a | 88.98 | |||||||||
1997 | 68.10 | a | 72.29 | 85.29 | 84.70 | 99.71 | 98.63 | 105.45 | 107.16 | 99.66 | a | 86.97 | a | 76.93 | 64.87 | 87.48 | ||||||||||
1998 | 68.42 | 66.21 | 75.71 | c | 78.90 | 84.87 | 96.62 | a | 109.03 | 108.58 | 98.60 | 87.39 | 77.13 | 68.50 | a | 85.00 | ||||||||||
1999 | 72.94 | 74.37 | a | 76.13 | a | 78.26 | c | 91.87 | 100.59 | a | 104.74 | 105.35 | 101.03 | a | 94.97 | 82.10 | 71.39 | 87.81 | ||||||||
2000 | 73.19 | 71.10 | 77.14 | b | 90.10 | a | 97.74 | 104.62 | a | 107.45 | 105.06 | 100.86 | a | 83.87 | 71.73 | 72.94 | 87.98 | |||||||||
2001 | 65.32 | 68.62 | d | 77.97 | a | 81.28 | a | 100.16 | 104.93 | 107.00 | a | 107.81 | 104.77 | 93.79 | b | 80.52 | a | 67.81 | 88.33 | |||||||
2002 | 69.13 | 76.11 | 77.13 | a | 86.10 | a | 93.33 | a | 106.70 | 108.55 | 107.29 | 102.41 | a | 88.06 | 79.63 | 67.74 | 88.52 | |||||||||
2003 | 77.84 | 69.37 | a | 79.31 | b | 78.31 | a | 93.68 | 102.43 | 108.97 | 104.84 | 103.37 | 96.29 | 71.63 | 68.60 | a | 87.89 | |||||||||
2004 | 69.17 | a | 67.03 | 86.35 | 86.90 | 95.65 | 101.97 | 107.32 | 105.35 | 99.41 | a | 86.21 | c | 73.82 | m | 67.55 | 88.45 | a | ||||||||
2005 | 67.34 | b | 66.81 | a | 76.03 | 83.23 | 94.87 | 101.30 | 110.41 | b | 105.42 | 100.48 | a | 90.93 | d | 79.72 | a | 72.10 | 87.39 | |||||||
2006 | 71.61 | 75.43 | 71.06 | 81.75 | b | 98.20 | a | 107.30 | 109.65 | 106.97 | 100.17 | 87.13 | 81.33 | 68.77 | 88.28 | |||||||||||
2007 | 66.40 | a | 72.86 | 83.42 | 87.00 | a | 95.74 | 104.72 | a | 107.65 | 108.10 | 99.66 | a | 89.43 | a | 82.79 | b | 64.87 | a | 88.55 | ||||||
2008 | 64.52 | 73.46 | a | 81.80 | a | 86.67 | 90.47 | a | 106.30 | 107.81 | 106.50 | a | 103.43 | 93.57 | c | 82.95 | h | 67.13 | a | 89.24 | a | |||||
2009 | 73.81 | 70.18 | 79.00 | 83.77 | 99.68 | 96.57 | 110.26 | 106.97 | 104.30 | 87.39 | 80.60 | 66.52 | 88.25 | |||||||||||||
2010 | 69.10 | 70.86 | 75.42 | 80.03 | 87.87 | 101.20 | 108.29 | 106.97 | 103.47 | 86.32 | 75.57 | 70.77 | 86.32 | |||||||||||||
2011 | 69.83 | a | 68.37 | a | 77.42 | 85.13 | 87.26 | 100.37 | 107.19 | 110.32 | 103.28 | a | 92.23 | 74.70 | 66.14 | x | 88.74 | a | ||||||||
2012 | 75.00 | 73.48 | 79.16 | 87.10 | 98.74 | 104.27 | 106.48 | 106.45 | 102.23 | 92.03 | 81.30 | 69.16 | 89.62 | |||||||||||||
2013 | 66.03 | 71.14 | 85.81 | 89.83 | 96.35 | 108.07 | 105.71 | 104.32 | 98.87 | 85.19 | 76.47 | 69.90 | 88.14 | |||||||||||||
2014 | 76.45 | 78.32 | 82.61 | 87.03 | 94.26 | 104.00 | 107.61 | 102.71 | 100.87 | 93.16 | 79.60 | 68.13 | 89.56 | |||||||||||||
2015 | 71.68 | 80.32 | 85.35 | 85.37 | 87.23 | 104.23 | 103.32 | 108.35 | 100.93 | 91.39 | 74.27 | 67.77 | 88.35 | |||||||||||||
2016 | 67.10 | a | 81.62 | 83.52 | 86.47 | 91.20 | a | 106.73 | 109.63 | a | 107.52 | b | 97.40 | 92.07 | a | 80.30 | 68.48 | b | 89.34 | |||||||
2017 | 65.71 | 72.96 | 84.52 | 89.33 | 93.74 | 107.00 | 109.39 | 107.16 | 97.47 | 93.45 | 82.73 | 74.90 | 89.86 | |||||||||||||
2018 | 75.74 | 72.86 | 78.00 | 90.70 | 93.84 | 105.37 | 109.48 | 108.31 | b | 104.00 | 87.81 | 77.45 | a | 68.90 | 89.37 | |||||||||||
2019 | 67.97 | 63.93 | 76.55 | 88.10 | 85.35 | 102.77 | 108.35 | 110.43 | a | 99.73 | 89.65 | 79.37 | 65.00 | 86.43 | ||||||||||||
2020 | 71.65 | 74.62 | 72.97 | 84.63 | 98.23 | 102.53 | 110.68 | 111.65 | 104.53 | 95.65 | 79.33 | 70.32 | 89.73 | |||||||||||||
2021 | 69.58 | 75.00 | a | 75.52 | 89.57 | 94.16 | 107.03 | 107.77 | 107.03 | a | 101.27 | 86.29 | 83.97 | 68.39 | 88.80 | |||||||||||
2022 | 70.77 | a | 72.25 | 81.48 | b | 87.93 | 94.48 | 104.33 | 107.03 | 105.35 | 99.96 | d | 88.71 | 71.43 | 67.61 | 87.61 | ||||||||||
2023 | 64.35 | 65.54 | 69.90 | 86.80 | 91.16 | 96.23 | 110.68 | 105.29 | 97.60 | 91.06 | 77.33 | 70.97 | 85.58 | |||||||||||||
2024 | 68.03 | 69.10 | 74.10 | 81.47 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.41 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 69.42 | 72.56 | 78.08 | 85.18 | 93.22 | 103.09 | 107.52 | 106.32 | 100.84 | 89.93 | 78.01 | 68.95 | 87.83 | |||||||||||||
S.D. | 3.57 | 4.10 | 4.54 | 4.12 | 4.08 | 3.11 | 2.17 | 2.28 | 2.69 | 3.69 | 3.67 | 3.33 | 1.45 | |||||||||||||
SKEW | 0.09 | 0.18 | 0.38 | -0.20 | -0.51 | -0.37 | -0.35 | -0.21 | -0.70 | 0.23 | -0.38 | 0.08 | 0.11 | |||||||||||||
MAX | 77.84 | 81.96 | 88.52 | 95.55 | 100.16 | 108.40 | 112.03 | 111.65 | 106.20 | 98.13 | 84.27 | 77.32 | 91.53 | |||||||||||||
MIN | 61.06 | 63.93 | 69.90 | 74.27 | 83.61 | 96.23 | 103.16 | 100.06 | 93.10 | 82.74 | 69.03 | 61.71 | 84.86 | |||||||||||||
YRS | 57 | 57 | 56 | 56 | 56 | 56 | 57 | 56 | 56 | 56 | 55 | 56 | 52 |