YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 74.67 | v | 67.37 | 54.55 | 60.96 | j | ||
1952 | 53.94 | 64.93 | 63.00 | 79.60 | 91.16 | 95.07 | 106.10 | 106.10 | 99.63 | 93.00 | 68.07 | 58.03 | 81.55 | |||||||||||||
1953 | 65.19 | 66.14 | 75.07 | a | 80.17 | 83.23 | 100.00 | 106.13 | 103.55 | 101.30 | 85.77 | 71.67 | 57.94 | 83.01 | ||||||||||||
1954 | 57.84 | 70.46 | 65.16 | 81.33 | 95.04 | c | 99.60 | 107.42 | 102.03 | 99.10 | 87.83 | b | 72.63 | 59.19 | 83.14 | |||||||||||
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 104.00 | r | 103.38 | b | 100.77 | 88.68 | 67.83 | a | 60.93 | b | 84.32 | g | ||
1956 | 53.40 | a | 60.62 | 72.00 | r | ----- | z | ----- | z | ----- | z | ----- | z | 101.90 | j | 99.60 | 87.12 | f | 70.44 | n | 65.39 | 69.75 | h | |||
1957 | 56.87 | 71.25 | 73.71 | 79.60 | 86.03 | 102.37 | 106.00 | 101.06 | 97.23 | 82.26 | 66.34 | a | 62.71 | 82.12 | ||||||||||||
1958 | 63.06 | 68.04 | 65.13 | 78.93 | 94.94 | 99.97 | 103.48 | 103.26 | ----- | z | ----- | z | ----- | z | ----- | z | 84.60 | d | ||||||||
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 108.33 | v | 102.29 | c | 95.50 | h | ----- | z | 69.69 | a | 61.58 | 77.85 | i | |
1960 | 52.04 | e | 57.57 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 98.69 | d | 80.23 | 67.80 | e | ----- | z | 74.69 | h | |
1961 | 63.06 | o | 67.50 | n | ----- | z | ----- | z | ----- | z | ----- | z | 106.27 | t | 102.61 | 92.00 | a | 82.72 | b | ----- | z | ----- | z | 92.45 | i | |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 100.50 | r | 106.68 | 102.55 | 98.77 | ----- | z | ----- | z | ----- | z | 102.66 | i | |||
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 97.93 | a | 81.00 | m | 70.47 | 61.63 | a | 76.68 | i | |
1967 | 57.83 | a | 65.85 | b | 73.03 | 70.00 | ----- | z | 94.04 | e | 106.63 | a | 106.87 | 93.97 | a | 89.64 | i | 72.23 | 48.82 | c | 78.93 | b | ||||
1968 | 58.55 | 68.95 | g | 72.46 | e | 76.74 | k | 90.28 | b | 101.70 | j | 105.55 | 99.10 | 98.03 | a | 89.00 | f | 69.07 | 56.13 | 81.15 | d | |||||
1969 | 59.45 | 58.29 | 66.71 | 82.30 | 93.23 | 98.27 | 103.45 | 108.94 | 98.80 | 79.71 | 69.37 | 62.63 | a | 81.76 | ||||||||||||
1970 | 59.10 | 68.18 | 67.58 | 73.43 | 90.94 | 101.33 | 105.68 | 106.55 | 94.57 | 81.23 | 70.03 | 58.06 | 81.39 | |||||||||||||
1971 | 58.52 | 65.11 | 71.19 | 78.17 | 83.35 | 98.63 | 108.48 | 102.65 | 95.93 | 77.45 | 65.87 | 52.71 | 79.84 | |||||||||||||
1972 | 56.29 | 67.14 | 81.87 | 81.62 | a | 90.87 | 100.63 | 109.03 | a | 102.97 | 93.27 | 76.42 | 60.50 | 55.00 | 81.30 | |||||||||||
1973 | 51.10 | a | 61.68 | 62.19 | 75.31 | a | 91.81 | 100.97 | 107.27 | a | 104.65 | 95.63 | 85.35 | 67.34 | a | 61.13 | 80.37 | |||||||||
1974 | 52.55 | 63.00 | a | 75.93 | a | 80.70 | 94.16 | 107.37 | 105.87 | 105.65 | 100.67 | 86.29 | 67.27 | 55.19 | 82.89 | |||||||||||
1975 | 57.35 | 60.75 | 65.00 | 71.97 | 87.42 | 100.30 | 107.65 | 104.35 | 98.93 | 84.39 | 68.43 | 62.97 | 80.79 | |||||||||||||
1976 | 63.71 | 66.93 | 70.39 | 77.97 | 93.42 | 100.87 | 106.19 | 103.00 | 93.40 | 81.42 | 73.47 | 62.87 | 82.80 | |||||||||||||
1977 | 59.00 | 70.86 | 68.94 | 85.50 | 82.81 | 102.87 | 106.03 | 104.26 | 96.20 | 87.71 | 72.20 | 64.65 | 83.42 | |||||||||||||
1978 | 57.71 | 63.25 | 72.19 | 75.97 | 88.97 | 102.60 | 107.35 | 104.81 | 94.90 | 88.97 | 65.77 | 54.19 | 81.39 | |||||||||||||
1979 | 49.52 | 59.04 | 68.55 | 80.53 | 90.97 | 101.87 | 107.03 | 101.84 | 102.43 | 88.45 | 67.67 | 63.45 | 81.78 | |||||||||||||
1980 | 59.90 | 66.14 | 67.03 | 80.10 | 85.55 | 101.10 | 107.16 | 104.45 | 98.87 | 85.35 | 72.33 | 68.16 | 83.01 | |||||||||||||
1981 | 65.45 | 68.21 | 69.30 | a | 86.53 | 89.97 | 105.57 | 109.52 | 106.55 | 97.97 | 80.55 | 72.93 | 64.10 | 84.72 | ||||||||||||
1982 | 57.32 | 65.78 | a | 68.84 | 79.90 | 90.97 | a | 99.33 | 104.74 | 103.16 | 93.10 | 78.26 | 64.67 | 55.87 | 80.16 | |||||||||||
1983 | 60.55 | 63.04 | 67.81 | 73.07 | 88.94 | 98.70 | 104.63 | a | 99.61 | 96.80 | 82.29 | 68.21 | a | 58.52 | 80.18 | |||||||||||
1984 | 60.23 | 64.93 | 73.39 | 79.70 | 97.19 | 99.50 | 103.00 | 101.77 | 98.30 | 77.16 | 66.93 | 55.00 | 81.43 | |||||||||||||
1985 | 56.81 | 60.89 | 69.74 | 85.70 | 92.87 | 104.62 | a | 106.52 | 105.00 | 90.80 | 81.84 | 63.70 | 60.71 | 81.60 | ||||||||||||
1986 | 66.39 | 66.57 | 77.00 | 81.17 | 91.48 | 103.17 | 101.74 | 103.52 | 87.97 | 79.42 | 69.10 | 59.10 | 82.22 | |||||||||||||
1987 | 56.39 | 62.29 | 68.40 | a | 85.93 | 88.70 | a | 102.33 | 102.13 | a | 102.23 | 96.30 | 85.19 | 65.27 | 52.74 | 80.66 | ||||||||||
1988 | 55.33 | a | 67.41 | 73.10 | 78.77 | 88.70 | a | 100.07 | 106.16 | 100.65 | 93.00 | 89.81 | 68.23 | 57.87 | 81.59 | |||||||||||
1989 | 54.87 | 61.64 | 77.26 | 87.33 | 89.03 | 98.60 | 105.45 | 99.27 | a | 94.70 | 81.73 | a | 71.53 | 62.23 | 81.97 | |||||||||||
1990 | 57.77 | 60.89 | 74.81 | 82.23 | 87.23 | a | 100.14 | a | 102.83 | a | 99.23 | 93.57 | 81.20 | a | 65.83 | 48.83 | a | 79.55 | ||||||||
1991 | 52.81 | 66.93 | 59.06 | 72.90 | 80.29 | 90.50 | 104.67 | y | 101.13 | h | 94.70 | 86.45 | 65.23 | 56.32 | 72.52 | b | ||||||||||
1992 | 56.19 | 64.38 | 67.10 | 83.13 | 89.48 | 97.47 | 101.06 | 102.90 | 96.03 | 84.84 | 63.83 | 51.84 | 79.86 | |||||||||||||
1993 | 54.42 | 58.36 | ----- | z | 79.97 | 90.52 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.23 | 58.77 | 67.71 | f | ||||||
1994 | 62.96 | c | 58.25 | 74.19 | 80.90 | 90.73 | a | 105.40 | 108.81 | 107.90 | a | 99.27 | 82.00 | 62.21 | a | 60.55 | 82.76 | |||||||||
1995 | ----- | z | ----- | z | ----- | z | 77.47 | k | 79.11 | v | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | 67.18 | l | 74.68 | 83.77 | 92.52 | 104.40 | 109.06 | 107.68 | 95.65 | d | 82.03 | b | 71.18 | h | 58.23 | 89.78 | c | |||||||
1997 | 57.26 | 64.21 | 79.19 | 79.13 | 97.94 | 99.67 | 105.10 | 105.10 | 95.03 | 82.52 | 69.40 | 57.90 | 82.70 | |||||||||||||
1998 | 60.23 | 57.96 | 69.81 | 74.80 | 85.16 | 94.90 | a | 106.93 | a | 106.47 | a | 93.25 | b | 79.90 | 67.57 | 59.97 | 79.75 | |||||||||
1999 | 63.84 | 66.00 | 76.13 | a | 73.97 | a | 89.40 | a | 98.87 | 101.48 | 103.77 | 96.12 | d | 89.78 | d | 74.25 | b | 61.76 | b | 82.95 | ||||||
2000 | 62.77 | 65.55 | 71.55 | 87.03 | a | 94.31 | e | 103.70 | 106.83 | b | 103.52 | 97.80 | 79.45 | 63.03 | 63.39 | 83.24 | ||||||||||
2001 | 59.32 | 61.61 | 72.45 | 78.14 | b | 96.81 | 101.28 | a | 104.31 | e | 104.45 | 100.40 | 87.03 | 71.67 | 55.48 | 82.75 | ||||||||||
2002 | 58.45 | 67.11 | 70.61 | 85.52 | c | 91.06 | 103.60 | 108.81 | 103.87 | 96.97 | 84.13 | 71.41 | a | 60.32 | 83.49 | |||||||||||
2003 | 70.35 | 63.82 | 72.29 | 76.17 | 91.97 | 103.77 | 110.90 | 106.71 | 101.43 | 91.39 | 64.83 | 59.06 | 84.39 | |||||||||||||
2004 | 60.80 | a | 58.59 | 82.16 | 80.37 | 93.42 | 103.83 | 108.13 | 104.90 | 97.13 | 79.61 | 64.30 | 58.87 | 82.68 | ||||||||||||
2005 | 59.79 | c | 62.93 | a | 69.15 | d | 77.78 | c | 88.96 | f | 96.79 | f | 110.29 | c | 103.93 | c | 97.92 | f | 84.77 | 72.28 | a | 59.61 | c | 77.83 | c | |
2006 | 61.57 | a | 67.61 | e | 65.58 | e | 80.54 | b | 96.20 | a | 106.00 | 109.33 | a | 105.80 | a | 95.53 | 80.90 | a | 71.73 | 58.83 | a | 83.30 | ||||
2007 | 57.63 | a | 66.96 | 77.74 | 83.33 | 96.10 | 103.83 | 109.68 | 105.73 | a | 97.20 | 83.70 | a | 76.62 | f | 54.97 | b | 85.17 | a | |||||||
2008 | 56.07 | d | 61.24 | h | 73.87 | a | 80.74 | c | 87.58 | 102.60 | 108.10 | 106.39 | 100.60 | 86.00 | 73.13 | 56.32 | 84.67 | a | ||||||||
2009 | 61.35 | 63.37 | a | 73.03 | 78.33 | 96.90 | 96.40 | 109.50 | a | 107.29 | 101.41 | a | 81.60 | a | 74.07 | 56.50 | a | 83.31 | ||||||||
2010 | 59.65 | 63.15 | a | 70.03 | a | 77.57 | 85.57 | c | 103.00 | 111.39 | 106.23 | 102.17 | a | 84.52 | 68.50 | 60.06 | 82.65 | |||||||||
2011 | 59.19 | 61.29 | 70.39 | 78.90 | 85.06 | 99.77 | 105.74 | 108.37 | a | 100.55 | a | 84.39 | 67.53 | 59.26 | 81.70 | |||||||||||
2012 | 63.48 | 65.86 | 75.71 | 84.17 | 96.93 | a | 107.13 | 108.06 | 108.61 | 99.63 | 87.45 | 75.77 | 59.16 | 86.00 | ||||||||||||
2013 | 57.54 | c | 63.21 | d | 77.81 | 86.30 | g | 94.40 | a | 108.24 | a | 110.11 | m | 106.23 | 93.59 | a | 82.00 | 71.60 | 57.77 | 81.24 | b | |||||
2014 | 67.70 | a | 69.93 | 76.66 | b | 84.33 | 93.00 | a | 105.93 | 109.68 | 102.27 | a | 100.35 | j | 89.68 | 72.85 | c | 61.68 | 84.88 | a | ||||||
2015 | 63.68 | 74.43 | 80.13 | 84.63 | 90.07 | d | 108.00 | 106.61 | 109.16 | 103.47 | 89.90 | 69.67 | 58.68 | 86.54 | ||||||||||||
2016 | 59.00 | 72.62 | 78.77 | 81.47 | 89.16 | 109.77 | 111.26 | 106.61 | 97.50 | 89.29 | 76.37 | 59.42 | 85.94 | |||||||||||||
2017 | 57.77 | 66.61 | 72.00 | w | ----- | z | ----- | z | ----- | z | 109.29 | n | 107.39 | c | ----- | z | ----- | z | ----- | z | ----- | z | 77.26 | i | ||
2018 | ----- | z | 72.24 | g | 71.29 | 86.90 | a | 94.48 | 108.07 | 110.87 | 109.23 | 105.21 | k | 80.78 | h | 71.45 | a | 62.10 | 89.30 | d | ||||||
2019 | 60.10 | b | 58.82 | 71.39 | 83.77 | 82.35 | 102.34 | a | 109.13 | 109.90 | 100.47 | 83.61 | 73.27 | 57.71 | 82.74 | |||||||||||
2020 | 62.32 | 66.55 | 70.77 | 77.94 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.55 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 58.97 | 64.64 | 71.72 | 80.22 | 90.57 | 101.67 | 106.80 | 104.55 | 97.18 | 84.03 | 68.97 | 58.79 | 82.30 | |||||||||||||
S.D. | 4.10 | 3.84 | 4.89 | 4.12 | 4.21 | 3.84 | 2.56 | 2.64 | 3.18 | 3.91 | 3.57 | 3.79 | 1.63 | |||||||||||||
SKEW | 0.24 | 0.18 | -0.08 | -0.32 | -0.35 | -0.28 | -0.31 | -0.06 | -0.36 | 0.20 | -0.13 | -0.36 | 0.54 | |||||||||||||
MAX | 70.35 | 74.43 | 82.16 | 87.33 | 97.94 | 109.77 | 111.39 | 109.90 | 103.47 | 93.00 | 76.37 | 68.16 | 86.54 | |||||||||||||
MIN | 49.52 | 57.96 | 59.06 | 70.00 | 80.29 | 90.50 | 101.06 | 99.10 | 87.97 | 76.42 | 60.50 | 48.82 | 79.55 | |||||||||||||
YRS | 58 | 55 | 56 | 54 | 54 | 53 | 54 | 59 | 57 | 54 | 58 | 60 | 44 |