YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1955 | 60.74 | 67.46 | 78.00 | 82.47 | 90.29 | 100.80 | 102.23 | 101.74 | 101.50 | 93.77 | 75.97 | 70.68 | 85.47 | |||||||||||||
1956 | 70.94 | 67.38 | 80.84 | 83.23 | 93.67 | a | 103.93 | 104.58 | 106.87 | 107.10 | 89.55 | 77.40 | 70.45 | 87.99 | ||||||||||||
1957 | 65.10 | 77.07 | 78.61 | 84.40 | 88.65 | 105.03 | 108.77 | 103.48 | 101.93 | 84.06 | 71.50 | 70.48 | 86.59 | |||||||||||||
1958 | 70.45 | 73.36 | 71.35 | 85.40 | 99.48 | 102.60 | 107.74 | 104.97 | 101.77 | 93.00 | 76.97 | 75.13 | 88.52 | |||||||||||||
1959 | 72.29 | 69.93 | 81.90 | 90.63 | 90.90 | 106.20 | 108.26 | 103.55 | 98.83 | 91.00 | 79.10 | 66.19 | 88.23 | |||||||||||||
1960 | 62.68 | 68.72 | 82.68 | 87.67 | 93.45 | 107.73 | 108.94 | 105.97 | 102.40 | 88.77 | 76.50 | 67.61 | 87.76 | |||||||||||||
1961 | 71.29 | 74.96 | 78.42 | 88.17 | 91.58 | 105.17 | 105.94 | 103.81 | 97.53 | 88.81 | 72.83 | 65.48 | 87.00 | |||||||||||||
1962 | 67.84 | 70.39 | 73.26 | 92.87 | 90.71 | 101.60 | 107.29 | 108.97 | 100.97 | 90.81 | 80.80 | 70.58 | 88.01 | |||||||||||||
1963 | 64.53 | a | 79.93 | 77.00 | 81.03 | 94.81 | 97.30 | 106.87 | 103.32 | 102.63 | 90.39 | 76.59 | a | 70.13 | 87.04 | |||||||||||
1964 | ----- | z | 68.72 | 75.35 | 83.33 | 91.94 | 100.07 | 107.13 | a | 103.52 | 98.97 | 93.29 | 71.60 | 67.58 | 87.41 | a | ||||||||||
1965 | 68.32 | 71.46 | 73.84 | 82.70 | 90.26 | 95.73 | 104.97 | 104.58 | 96.77 | 95.26 | 76.53 | 63.70 | a | 85.34 | ||||||||||||
1966 | 62.71 | 66.93 | 80.16 | 88.53 | 96.13 | 101.63 | 105.61 | 105.03 | 99.97 | 88.61 | 78.13 | 68.58 | 86.84 | |||||||||||||
1967 | 68.00 | 75.00 | 78.84 | 75.87 | 91.71 | 97.53 | 105.65 | 105.90 | 96.47 | 91.94 | 80.57 | 61.90 | 85.78 | |||||||||||||
1968 | 67.65 | 76.66 | 78.61 | 83.63 | 93.13 | 103.23 | 103.81 | 101.13 | 101.13 | 90.29 | 76.73 | 64.06 | 86.67 | |||||||||||||
1969 | 69.00 | 68.96 | 75.94 | 85.10 | 95.68 | 97.63 | 105.39 | 108.26 | 101.87 | 84.94 | 75.00 | 67.71 | 86.29 | |||||||||||||
1970 | 66.97 | 74.04 | 74.97 | 79.93 | 95.15 | e | 101.30 | 106.77 | 104.87 | 98.10 | 85.77 | 77.43 | 66.00 | 85.94 | ||||||||||||
1971 | 69.00 | 73.93 | 81.35 | 82.43 | 87.03 | 99.93 | 106.03 | 101.19 | 99.00 | 82.10 | 74.23 | 63.13 | 84.95 | |||||||||||||
1972 | 67.35 | 76.90 | 87.52 | 86.90 | 93.10 | 101.50 | 108.26 | 102.10 | 98.57 | 81.42 | 71.63 | 64.60 | a | 86.65 | ||||||||||||
1973 | 65.00 | 70.43 | 70.45 | 82.97 | 96.93 | a | 104.03 | 106.13 | 104.61 | 99.47 | 91.03 | 76.41 | a | 70.65 | 86.51 | |||||||||||
1974 | 66.35 | 72.79 | 79.52 | 86.47 | 94.39 | 107.30 | 103.90 | 106.00 | 100.80 | 89.26 | 77.73 | 65.58 | 87.51 | |||||||||||||
1975 | 69.07 | a | 71.54 | 74.93 | a | 76.83 | 91.58 | 101.90 | 105.71 | 107.55 | 101.10 | 88.00 | 78.00 | 68.84 | 86.25 | |||||||||||
1976 | 71.23 | 73.24 | 76.71 | 82.10 | 94.68 | 103.30 | 103.94 | 105.10 | 94.27 | 87.81 | 78.50 | 69.58 | 86.70 | |||||||||||||
1977 | 67.23 | 78.29 | 74.16 | 88.47 | 86.35 | 105.07 | 107.23 | 104.19 | 99.20 | 92.94 | 80.60 | 72.77 | 88.04 | |||||||||||||
1978 | 66.16 | 72.14 | 80.35 | 83.57 | 94.19 | 108.20 | 108.81 | 105.68 | 98.30 | 93.10 | 72.77 | ----- | z | 89.39 | a | |||||||||||
1979 | 59.87 | a | 70.36 | 75.29 | 86.60 | 91.81 | 104.73 | ----- | z | 103.32 | ----- | z | ----- | z | 75.60 | 72.74 | 82.26 | c | ||||||||
1980 | 70.94 | 75.31 | 75.90 | 85.28 | a | 88.16 | 104.50 | 109.52 | 105.97 | 102.27 | 91.81 | 79.93 | 75.71 | 88.77 | ||||||||||||
1981 | 72.30 | a | 75.46 | 76.45 | 88.43 | 92.55 | 107.73 | 107.52 | 108.39 | 102.40 | 86.29 | 80.73 | 72.67 | a | 89.24 | |||||||||||
1982 | 67.39 | c | 74.37 | a | 73.97 | a | 84.77 | 92.03 | 98.90 | 104.65 | 104.76 | b | 97.86 | a | 87.65 | 73.14 | b | 64.74 | 85.35 | |||||||
1983 | 70.58 | 70.14 | 76.23 | 78.80 | 94.84 | 101.47 | 107.42 | 102.16 | 100.87 | 89.32 | 76.07 | 68.65 | 86.38 | |||||||||||||
1984 | 70.71 | 74.00 | 81.48 | 83.53 | 100.74 | 100.97 | 102.58 | 103.26 | 101.40 | 84.03 | 74.57 | 62.45 | 86.64 | |||||||||||||
1985 | 65.23 | a | 69.79 | 75.81 | 90.07 | 94.90 | 106.27 | 107.74 | 107.10 | 93.30 | 86.52 | 71.70 | 68.52 | 86.41 | ||||||||||||
1986 | 74.52 | 74.93 | 83.48 | 86.53 | 95.26 | 105.50 | 105.21 | b | 105.32 | 94.23 | 86.71 | 76.47 | 67.77 | 87.99 | ||||||||||||
1987 | 66.58 | 72.71 | 76.19 | 90.97 | 92.94 | 104.80 | 105.16 | 104.57 | a | 99.90 | 91.81 | 75.23 | 63.61 | 87.04 | ||||||||||||
1988 | 65.90 | 75.72 | 80.90 | 85.33 | 93.74 | 102.67 | 106.00 | 105.24 | b | 100.83 | 95.19 | 77.33 | 68.55 | 88.12 | ||||||||||||
1989 | 65.55 | 74.41 | a | 84.71 | 94.20 | 94.87 | 103.77 | 108.74 | 104.07 | a | 102.63 | 90.65 | 80.93 | 71.32 | 89.65 | |||||||||||
1990 | 68.71 | 71.43 | 80.94 | 87.93 | 92.52 | 105.33 | 105.42 | 103.84 | 100.33 | 93.33 | a | 78.33 | 64.80 | a | 87.74 | |||||||||||
1991 | 68.32 | 80.32 | 72.13 | a | 85.48 | a | 90.71 | 99.30 | 105.63 | a | 106.19 | 101.27 | 93.94 | 77.53 | 67.48 | 87.36 | ||||||||||
1992 | 68.50 | a | 74.97 | 76.13 | a | 90.97 | 96.52 | 102.30 | 105.35 | 105.90 | 104.63 | 92.90 | 74.70 | 62.42 | 87.94 | |||||||||||
1993 | 65.87 | 69.71 | 81.52 | 89.80 | 96.00 | 103.50 | 105.74 | 104.94 | 103.00 | 92.17 | a | 75.66 | a | 69.16 | 88.09 | |||||||||||
1994 | 72.39 | 71.32 | 82.29 | 87.37 | 92.77 | 107.43 | 108.81 | 107.90 | 102.47 | 88.61 | 70.63 | 65.87 | 88.16 | |||||||||||||
1995 | 67.00 | a | 79.25 | 79.65 | 84.03 | 88.77 | 102.03 | a | 108.94 | 109.61 | 104.97 | 94.42 | 85.10 | 72.87 | 89.72 | |||||||||||
1996 | 73.03 | 77.38 | 81.03 | a | 90.30 | 98.00 | 106.63 | 109.00 | 107.16 | 98.70 | 90.48 | 78.77 | 69.87 | 90.03 | ||||||||||||
1997 | 70.74 | 72.71 | 86.23 | 85.20 | 100.68 | 99.73 | 106.32 | 107.47 | a | 101.21 | a | 88.23 | 78.60 | 64.52 | 88.47 | |||||||||||
1998 | 69.68 | 67.25 | 76.77 | 81.70 | 87.77 | 98.33 | 108.77 | 108.03 | 100.93 | 88.65 | 77.13 | ----- | z | 87.73 | a | |||||||||||
1999 | 72.00 | 74.21 | 78.00 | 79.07 | 92.65 | 100.90 | 103.84 | 106.00 | 102.03 | 95.94 | 82.67 | 70.23 | a | 88.13 | ||||||||||||
2000 | 73.32 | 74.45 | 78.68 | 90.87 | 98.63 | a | 104.03 | 107.52 | 104.74 | 102.33 | 85.60 | a | 71.03 | 72.00 | 88.60 | |||||||||||
2001 | 66.68 | 69.59 | a | 79.48 | 84.57 | b | 100.71 | 104.60 | 105.55 | 106.10 | 104.77 | 93.10 | 79.83 | 66.19 | 88.43 | |||||||||||
2002 | 68.55 | 75.93 | 77.77 | 87.63 | 94.16 | 106.10 | 107.58 | 107.03 | 102.77 | 87.71 | 79.53 | 67.32 | 88.51 | |||||||||||||
2003 | 77.03 | 70.71 | 79.19 | 81.17 | 95.13 | 103.23 | 108.37 | a | 105.23 | a | 103.80 | 96.90 | 73.17 | a | 68.39 | 88.53 | ||||||||||
2004 | 68.94 | 69.21 | 87.55 | 87.03 | a | 96.39 | 103.47 | 107.16 | 106.45 | 100.37 | 86.37 | a | 70.73 | 66.03 | 87.47 | |||||||||||
2005 | 67.35 | 68.46 | 77.71 | 86.10 | 96.06 | 102.47 | 109.81 | 106.55 | 101.97 | 89.87 | 79.90 | 69.97 | 88.02 | |||||||||||||
2006 | 71.52 | 76.71 | 74.16 | 85.03 | a | 99.00 | a | 107.73 | 109.00 | 106.65 | 100.23 | 87.84 | 81.30 | 68.52 | 88.97 | |||||||||||
2007 | 66.19 | 74.68 | 84.32 | 87.30 | 96.48 | 105.10 | 106.90 | 108.00 | 100.30 | 90.37 | a | 82.13 | 64.16 | 88.83 | ||||||||||||
2008 | ----- | z | 73.76 | 81.65 | 88.07 | 91.35 | 107.40 | 106.90 | 104.61 | 103.60 | ----- | z | ----- | z | ----- | z | 94.67 | d | ||||||||
2009 | ----- | z | ----- | z | ----- | z | ----- | z | 99.84 | ----- | z | ----- | z | ----- | z | ----- | z | 86.71 | 79.66 | a | ----- | z | 88.73 | i | ||
2010 | 69.39 | 70.82 | 76.19 | 81.47 | 90.42 | 102.43 | 106.81 | 106.52 | 104.37 | 87.84 | 75.53 | 70.23 | 86.83 | |||||||||||||
2011 | 69.29 | 67.68 | 80.68 | 85.97 | 90.19 | 102.87 | 107.45 | 110.58 | 104.17 | 92.94 | 74.60 | 64.71 | 87.59 | |||||||||||||
2012 | 72.68 | 73.86 | 79.74 | 88.20 | 98.65 | 105.67 | 105.03 | 106.71 | 103.00 | 92.87 | 82.57 | 69.45 | 89.87 | |||||||||||||
2013 | 65.81 | 71.32 | 85.68 | 89.57 | 96.45 | 107.83 | 107.19 | 106.61 | 101.80 | 88.77 | 78.07 | 68.19 | 88.94 | |||||||||||||
2014 | 75.71 | 80.14 | 84.52 | 89.43 | 97.68 | 107.17 | 109.26 | 104.61 | 103.30 | 95.55 | 80.30 | 70.13 | 91.48 | |||||||||||||
2015 | 71.48 | 81.86 | 87.52 | 88.30 | 90.45 | 106.37 | 106.26 | 110.23 | 103.63 | 93.77 | 76.10 | 68.00 | 90.33 | |||||||||||||
2016 | 68.97 | 81.86 | 85.58 | 88.20 | 93.03 | 108.00 | 110.10 | 107.23 | 98.33 | 93.13 | 79.50 | 67.58 | 90.13 | |||||||||||||
2017 | 65.81 | 73.36 | 84.61 | 89.67 | 94.13 | 107.10 | 108.23 | 108.26 | 98.13 | 93.26 | 82.00 | 72.32 | 89.74 | |||||||||||||
2018 | 74.74 | 73.04 | 79.26 | 90.37 | 95.16 | 105.03 | 108.55 | 107.42 | 104.67 | 85.52 | 77.03 | 66.23 | 88.92 | |||||||||||||
2019 | 66.58 | 65.68 | 79.10 | 89.73 | 88.68 | 103.53 | 107.58 | 109.52 | 99.60 | 88.81 | 78.37 | 64.42 | 86.80 | |||||||||||||
2020 | 69.90 | 72.97 | 73.84 | 86.73 | 99.29 | 104.03 | 110.39 | 110.97 | 105.83 | 95.71 | 79.77 | 68.71 | 89.84 | |||||||||||||
2021 | 68.61 | 74.25 | 77.26 | 90.73 | 95.77 | 107.77 | 107.29 | 106.23 | 102.73 | 87.71 | 84.10 | 69.32 | 89.31 | |||||||||||||
2022 | 70.52 | 73.50 | 81.71 | 89.63 | 96.52 | 106.07 | 107.16 | 105.03 | 101.97 | 89.97 | 72.43 | 66.52 | 88.42 | |||||||||||||
2023 | 65.10 | 67.82 | 73.87 | 88.17 | 92.97 | 99.20 | 111.61 | 107.55 | 100.33 | 91.90 | 78.70 | 69.87 | 87.26 | |||||||||||||
2024 | 66.16 | 70.90 | 75.87 | 85.46 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.98 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 68.60 | 73.02 | 78.92 | 86.10 | 93.93 | 103.57 | 106.93 | 105.83 | 100.98 | 90.10 | 77.22 | 68.06 | 87.84 | |||||||||||||
S.D. | 3.33 | 3.72 | 4.04 | 3.75 | 3.44 | 3.05 | 1.89 | 2.16 | 2.69 | 3.46 | 3.37 | 3.10 | 1.39 | |||||||||||||
SKEW | 0.00 | 0.33 | 0.27 | -0.47 | 0.02 | -0.45 | -0.14 | 0.10 | -0.55 | -0.25 | -0.09 | 0.11 | 0.13 | |||||||||||||
MAX | 77.03 | 81.86 | 87.55 | 94.20 | 100.74 | 108.20 | 111.61 | 110.97 | 107.10 | 96.90 | 85.10 | 75.71 | 91.48 | |||||||||||||
MIN | 59.87 | 65.68 | 70.45 | 75.87 | 86.35 | 95.73 | 102.23 | 101.13 | 93.30 | 81.42 | 70.63 | 61.90 | 84.95 | |||||||||||||
YRS | 67 | 69 | 69 | 68 | 69 | 68 | 67 | 68 | 67 | 67 | 68 | 65 | 63 |