YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 100.81 | d | 104.81 | 102.77 | i | 101.73 | 85.90 | a | 75.03 | a | 62.00 | 88.38 | f | |||
1954 | 62.52 | 76.04 | 67.87 | h | 86.18 | b | 93.18 | c | 99.12 | f | 105.37 | a | 101.10 | a | 98.27 | 89.19 | 77.17 | 63.41 | b | 85.24 | b | |||||
1955 | 56.58 | 61.96 | 73.87 | 79.23 | d | 89.26 | d | 99.79 | b | 101.93 | c | 101.32 | c | 99.33 | 90.68 | 71.46 | d | 64.35 | k | 84.13 | a | |||||
1956 | 66.94 | 62.90 | 76.48 | 81.03 | 91.07 | a | 102.37 | c | 103.71 | 102.74 | 102.87 | 84.65 | 70.43 | g | 66.00 | 85.52 | a | |||||||||
1957 | ----- | z | 70.00 | q | 72.53 | a | 77.23 | 83.35 | 101.10 | 104.26 | 98.55 | 97.03 | 77.10 | 63.30 | 63.58 | 83.80 | b | |||||||||
1958 | 62.39 | 66.57 | 63.32 | 76.57 | 92.87 | a | 98.57 | 103.42 | 102.84 | 95.40 | 86.84 | 69.77 | 67.84 | 82.20 | ||||||||||||
1959 | 63.13 | 61.50 | 75.00 | 84.97 | 86.87 | 102.30 | 105.55 | 99.45 | 92.93 | 85.23 | 71.30 | 60.19 | 82.37 | |||||||||||||
1960 | 55.84 | 59.34 | 75.42 | 82.40 | 90.13 | 103.60 | 105.90 | 102.68 | 97.13 | 82.10 | 68.77 | 61.71 | 82.08 | |||||||||||||
1961 | 65.03 | 67.71 | 71.81 | 81.97 | 87.71 | 103.03 | 104.52 | 100.35 | 91.93 | 83.10 | 66.13 | 58.32 | 81.80 | |||||||||||||
1962 | 60.42 | 62.54 | 65.74 | 86.27 | 83.61 | 95.40 | 101.35 | 102.48 | 95.23 | 83.84 | 74.60 | 63.23 | 81.23 | |||||||||||||
1963 | 57.42 | 70.96 | 68.81 | 73.53 | 89.97 | 92.13 | 102.32 | 98.68 | 96.27 | 84.13 | 67.57 | 61.26 | 80.25 | |||||||||||||
1964 | 57.58 | 60.69 | 66.39 | 74.20 | 84.13 | 93.97 | 100.84 | 97.84 | 92.83 | 88.81 | 64.30 | 59.84 | 78.45 | |||||||||||||
1965 | ----- | z | 64.11 | 66.23 | 72.50 | 81.87 | 89.80 | 99.74 | 99.45 | 88.43 | 88.03 | 69.03 | 56.13 | 79.58 | a | |||||||||||
1966 | 57.23 | 58.79 | 72.71 | 81.40 | 90.42 | 96.33 | 100.58 | 100.42 | 94.23 | 82.03 | 70.23 | 59.26 | 80.30 | |||||||||||||
1967 | 60.74 | 68.54 | b | 71.39 | 69.17 | 86.42 | 92.80 | 102.06 | 101.90 | 91.90 | 86.06 | 73.43 | 54.19 | 79.88 | ||||||||||||
1968 | 60.68 | 68.72 | 71.61 | 76.33 | 86.90 | 97.10 | 99.16 | 95.23 | 94.13 | 82.90 | 69.53 | 56.13 | 79.87 | |||||||||||||
1969 | 60.26 | 60.29 | 67.45 | 78.67 | 90.45 | 93.87 | 101.45 | 104.29 | 96.54 | b | 77.61 | 69.97 | a | 62.81 | 80.30 | |||||||||||
1970 | 60.29 | 68.44 | a | 68.26 | 72.23 | 88.71 | 97.67 | 103.48 | 100.81 | 92.50 | 79.81 | 70.57 | 58.00 | 80.06 | ||||||||||||
1971 | 61.71 | 64.86 | 72.60 | a | 76.93 | 81.13 | 95.87 | 103.87 | 97.23 | 93.67 | 76.77 | 67.83 | 55.42 | 78.99 | ||||||||||||
1972 | 60.45 | b | 69.03 | 80.77 | 80.00 | c | 88.07 | b | 95.31 | a | 103.13 | a | 97.39 | 91.67 | 73.19 | 62.70 | 54.58 | 79.69 | ||||||||
1973 | 54.23 | 60.50 | 59.35 | 73.77 | 88.87 | 97.90 | 102.26 | 98.83 | a | 92.83 | 82.77 | 66.27 | 62.00 | 78.30 | ||||||||||||
1974 | 54.67 | a | 62.71 | 69.81 | 77.45 | a | 87.52 | 101.80 | 98.13 | a | 98.48 | 94.27 | 81.26 | 67.87 | 55.19 | 79.10 | ||||||||||
1975 | 59.10 | b | 60.89 | 63.06 | 66.70 | 84.00 | c | 94.24 | a | 100.13 | 99.35 | 94.17 | 80.39 | 67.13 | 60.42 | 77.47 | ||||||||||
1976 | 62.54 | c | 64.34 | 66.03 | b | 72.38 | a | 87.74 | 94.70 | 97.23 | e | 96.74 | 87.21 | b | 77.55 | b | 69.66 | a | 59.55 | 77.97 | ||||||
1977 | 56.73 | a | 68.07 | 64.06 | 79.20 | 77.16 | 97.83 | a | 101.06 | 98.73 | a | 93.17 | 86.06 | 71.87 | 63.97 | a | 79.83 | |||||||||
1978 | 57.07 | a | 61.61 | 70.03 | 73.28 | a | 84.71 | 98.73 | 101.52 | 99.23 | 92.47 | 86.16 | 63.97 | 53.10 | 78.49 | |||||||||||
1979 | 49.61 | 60.82 | 66.23 | 77.33 | 86.39 | 97.87 | 101.65 | 96.81 | 99.57 | 85.16 | 66.40 | 62.37 | a | 79.18 | ||||||||||||
1980 | 60.16 | 65.03 | 63.57 | a | 76.50 | 81.35 | 96.33 | 103.84 | 100.03 | 95.47 | 83.26 | 71.53 | 67.55 | 80.39 | ||||||||||||
1981 | 63.48 | 67.37 | a | 67.35 | 82.67 | 84.65 | 100.93 | 102.10 | 102.16 | 93.93 | 77.16 | 72.13 | 62.03 | 81.33 | ||||||||||||
1982 | 58.32 | 63.64 | 66.14 | b | 76.60 | 85.27 | a | 94.13 | 99.26 | 98.30 | a | 90.63 | 78.65 | 64.72 | a | 55.26 | 77.58 | |||||||||
1983 | 61.10 | 62.96 | 65.87 | 70.73 | 87.81 | 95.47 | 101.58 | 96.81 | 94.43 | 81.35 | 68.24 | a | 60.29 | 78.89 | ||||||||||||
1984 | 62.90 | 65.14 | 72.90 | a | 76.13 | 94.68 | 95.37 | 98.71 | 98.06 | 95.90 | 75.84 | 66.33 | 54.73 | a | 79.72 | |||||||||||
1985 | 54.74 | 61.07 | 66.61 | 82.28 | a | 88.03 | 98.67 | 101.58 | 99.94 | 86.28 | a | 79.55 | 62.53 | 60.61 | 78.49 | |||||||||||
1986 | 65.84 | 64.93 | 73.45 | 76.87 | 87.52 | 98.30 | 97.68 | 99.32 | 85.67 | 77.42 | 68.20 | 57.26 | 79.37 | |||||||||||||
1987 | 56.30 | a | 62.61 | 65.90 | 82.37 | 85.16 | 98.13 | 97.58 | 97.48 | 92.20 | 83.58 | 64.97 | 52.68 | 78.25 | ||||||||||||
1988 | 57.10 | 66.31 | 71.23 | 77.07 | 86.90 | 98.47 | 103.23 | 98.65 | 93.80 | 90.26 | 69.83 | a | 60.26 | 81.09 | ||||||||||||
1989 | 60.68 | 66.15 | a | 77.61 | 88.13 | 90.06 | 99.07 | 104.68 | 99.97 | 96.30 | 83.48 | 74.50 | 64.52 | 83.76 | ||||||||||||
1990 | 59.16 | 63.30 | a | 74.19 | 82.77 | 88.19 | 102.37 | 104.06 | 100.45 | 96.67 | 87.10 | 71.50 | 59.08 | f | 84.52 | a | ||||||||||
1991 | 59.03 | 73.36 | 63.48 | 78.17 | 85.90 | 96.23 | 104.94 | 103.65 | 97.00 | 88.58 | 70.17 | 60.42 | 81.74 | |||||||||||||
1992 | 60.90 | 66.62 | 68.39 | 84.17 | 91.81 | 99.20 | 103.77 | 104.00 | 100.40 | 87.19 | 67.20 | 56.32 | 82.50 | |||||||||||||
1993 | 56.94 | 59.75 | 73.03 | 81.90 | 90.84 | 98.03 | 103.39 | 104.35 | 100.10 | 84.35 | 66.90 | 62.74 | 81.86 | |||||||||||||
1994 | 64.97 | 62.75 | 76.33 | a | 82.48 | a | 86.68 | 103.67 | 105.45 | 105.90 | 98.80 | 82.48 | 62.70 | 59.94 | 82.68 | |||||||||||
1995 | 57.26 | 69.54 | 67.94 | 75.10 | 85.48 | 97.60 | 107.16 | 107.39 | 100.53 | 88.61 | 79.07 | 66.32 | 83.50 | |||||||||||||
1996 | 65.81 | 68.50 | a | 72.90 | 85.10 | 93.48 | 104.13 | 107.94 | 106.48 | 95.43 | 84.52 | 72.30 | 63.19 | 84.98 | ||||||||||||
1997 | 61.33 | a | 65.86 | 80.15 | e | ----- | z | 99.25 | k | 98.67 | 104.94 | 104.48 | 97.50 | 83.48 | 72.27 | 58.90 | 82.76 | b | ||||||||
1998 | 62.81 | 59.96 | 69.77 | 75.13 | 85.13 | 96.27 | 106.10 | 104.84 | 94.33 | 82.52 | 71.17 | 61.48 | 80.79 | |||||||||||||
1999 | 66.81 | 68.82 | 73.94 | 74.00 | 88.68 | 99.27 | 100.52 | 102.03 | 97.20 | 89.74 | 76.90 | 64.13 | 83.50 | |||||||||||||
2000 | 66.42 | 68.31 | 73.13 | 86.23 | 96.13 | 102.57 | 105.74 | 101.84 | 98.30 | 80.74 | 64.87 | 65.74 | 84.17 | |||||||||||||
2001 | 59.45 | 62.82 | 73.65 | 79.37 | 98.42 | 103.10 | 103.16 | 103.48 | 100.50 | 87.32 | 73.17 | 57.84 | 83.52 | |||||||||||||
2002 | 61.55 | 70.21 | 72.03 | 84.20 | 92.23 | 104.57 | 106.75 | g | 104.71 | 97.50 | 82.61 | 73.53 | 60.77 | 82.17 | a | |||||||||||
2003 | 70.97 | 64.07 | 71.74 | 76.60 | 93.16 | 102.47 | 108.42 | 103.84 | 100.90 | 91.58 | 64.93 | 60.52 | 84.10 | |||||||||||||
2004 | 61.71 | 60.66 | 82.32 | 80.10 | 92.23 | 100.27 | 104.42 | 101.39 | 95.10 | 79.03 | 62.80 | 59.03 | 81.59 | |||||||||||||
2005 | 59.00 | 61.29 | 68.74 | 77.93 | 91.13 | 97.57 | b | 107.76 | b | 101.40 | a | 96.14 | b | 83.68 | 73.13 | 60.65 | n | 83.43 | a | |||||||
2006 | 64.41 | d | 70.70 | a | 64.62 | e | 78.77 | 94.10 | 103.77 | h | 108.87 | h | 104.23 | 96.76 | e | 84.07 | c | 75.70 | 61.72 | b | 79.51 | b | ||||
2007 | 60.13 | 68.71 | 77.76 | b | 82.63 | c | 94.71 | 100.32 | k | 106.48 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.74 | f | ||||
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | 72.40 | a | 78.53 | 94.87 | 93.40 | 104.97 | 102.39 | 98.87 | 80.65 | 74.40 | 57.58 | 85.81 | b | |||||||||
2010 | 61.48 | 63.71 | 68.19 | 75.90 | 83.00 | 98.43 | 104.71 | 101.42 | 99.30 | 83.58 | 69.97 | 63.90 | 81.13 | |||||||||||||
2011 | 62.58 | 61.75 | 72.23 | 79.60 | 84.10 | 97.73 | 101.94 | 105.23 | 97.27 | 86.26 | 68.57 | 58.06 | 81.28 | |||||||||||||
2012 | 65.94 | 67.59 | 72.35 | 82.27 | 91.57 | h | 101.13 | 100.35 | 102.26 | 97.30 | 86.29 | 75.23 | 61.23 | 82.90 | a | |||||||||||
2013 | 58.80 | a | 62.96 | a | 76.87 | 82.07 | 89.90 | 102.60 | 102.52 | b | 100.23 | 93.31 | a | 82.00 | 71.07 | 63.10 | 82.12 | |||||||||
2014 | 69.48 | d | 71.75 | d | 76.00 | b | 78.90 | i | 89.46 | c | 99.96 | d | 102.36 | f | 97.15 | e | 95.30 | c | 87.10 | b | 73.17 | a | 61.41 | b | 82.08 | b |
2015 | 63.07 | b | 72.05 | i | 77.39 | h | 80.76 | e | 83.48 | h | 100.32 | e | ----- | z | 103.30 | a | ----- | z | 80.60 | u | 65.67 | f | 59.15 | d | 81.32 | g |
2016 | 59.31 | e | 70.43 | f | 77.21 | c | 79.67 | 87.72 | f | 104.04 | d | 104.77 | 100.52 | b | 92.54 | f | 86.59 | b | 73.89 | b | 60.23 | a | 82.91 | c | ||
2017 | 57.65 | 67.67 | a | 77.86 | b | 78.47 | k | 88.39 | 103.50 | 104.11 | d | 102.32 | 92.80 | e | 87.81 | j | 76.21 | f | 69.88 | w | 86.79 | d | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 60.68 | 65.05 | 70.93 | 78.73 | 88.34 | 98.64 | 102.95 | 101.01 | 95.40 | 83.57 | 69.72 | 60.33 | 80.79 | |||||||||||||
S.D. | 3.90 | 3.86 | 4.92 | 4.49 | 4.12 | 3.41 | 2.64 | 2.75 | 3.61 | 4.03 | 4.04 | 3.54 | 1.94 | |||||||||||||
SKEW | 0.12 | 0.51 | 0.05 | -0.23 | -0.02 | -0.20 | -0.20 | 0.14 | -0.46 | -0.28 | 0.03 | -0.14 | 0.22 | |||||||||||||
MAX | 70.97 | 76.04 | 82.32 | 88.13 | 98.42 | 104.57 | 108.42 | 107.39 | 102.87 | 91.58 | 79.07 | 67.84 | 84.98 | |||||||||||||
MIN | 49.61 | 58.79 | 59.35 | 66.70 | 77.16 | 89.80 | 97.23 | 95.23 | 85.67 | 73.19 | 62.53 | 52.68 | 77.47 | |||||||||||||
YRS | 60 | 59 | 61 | 60 | 59 | 61 | 60 | 62 | 61 | 61 | 60 | 59 | 46 |