YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 95.31 | d | ----- | z | 98.54 | c | ----- | z | 89.57 | a | 68.57 | 61.48 | 82.69 | g | ||
1979 | 56.61 | 63.93 | 66.45 | 76.10 | a | 79.96 | g | ----- | z | 99.43 | a | 94.23 | ----- | z | ----- | z | 73.67 | 74.68 | 75.64 | d | ||||||
1980 | ----- | z | ----- | z | 68.35 | 76.37 | 74.17 | a | 88.81 | d | 100.28 | f | 95.12 | n | 94.14 | b | 86.36 | i | 78.96 | c | 76.04 | c | 79.55 | e | ||
1981 | 71.39 | 73.21 | 68.63 | a | 80.41 | a | 83.94 | 98.65 | d | 101.44 | d | ----- | z | 97.96 | f | ----- | z | 75.66 | a | 71.67 | a | 80.56 | c | |||
1982 | 63.16 | 68.48 | c | 64.90 | 72.45 | a | 78.26 | 81.44 | c | 98.18 | c | 98.18 | i | 89.96 | b | 84.60 | a | 67.73 | 63.42 | 75.69 | a | |||||
1983 | 67.10 | 65.92 | b | 64.16 | 68.52 | a | 81.30 | d | 85.68 | e | 98.36 | c | 96.20 | f | 96.11 | b | 83.93 | d | 70.39 | b | 65.45 | b | 76.99 | a | ||
1984 | 68.68 | c | 73.72 | 76.71 | 77.93 | a | 93.00 | 90.27 | 99.16 | 98.28 | b | 96.27 | d | 80.97 | b | 71.00 | 63.30 | d | 82.44 | |||||||
1985 | 63.35 | 68.82 | 67.90 | 81.00 | c | 84.06 | 95.40 | 99.81 | 100.58 | 86.80 | e | ----- | z | 69.38 | d | 71.92 | f | 81.71 | b | |||||||
1986 | 75.62 | b | 70.00 | 72.23 | 74.10 | j | 86.40 | a | 96.59 | a | 97.81 | d | 101.62 | b | 85.23 | 82.93 | a | 78.74 | c | 69.17 | b | 83.30 | a | |||
1987 | 64.55 | 66.67 | a | 68.90 | a | 85.13 | 84.42 | 95.44 | c | 91.68 | c | 96.00 | c | 93.00 | d | 84.21 | c | 70.83 | a | 59.14 | c | 80.00 | ||||
1988 | 66.32 | 74.03 | 78.53 | a | 77.58 | d | 85.27 | e | ----- | z | 101.95 | j | 96.44 | f | 93.21 | k | 89.72 | f | 72.27 | d | 61.79 | g | 75.67 | f | ||
1989 | 67.32 | i | 64.90 | h | 78.04 | f | 87.33 | f | 86.31 | e | 95.00 | h | 101.63 | l | 96.00 | h | 93.62 | d | 84.64 | i | 77.71 | i | 72.46 | g | 89.96 | j |
1990 | 68.69 | e | 70.07 | n | 75.25 | s | 77.96 | d | 82.05 | j | 95.14 | a | 101.03 | b | 97.11 | c | 94.47 | 89.52 | b | 77.74 | c | 67.07 | a | 85.41 | c | |
1991 | 67.67 | a | 79.12 | b | 65.57 | c | 77.53 | 81.21 | b | 88.90 | a | 95.52 | b | 98.29 | c | 96.10 | a | 89.13 | 79.32 | e | 68.36 | c | 82.23 | |||
1992 | 69.10 | 68.41 | 65.30 | a | 81.31 | d | 84.39 | c | 89.00 | k | ----- | z | 101.27 | i | 95.21 | k | 85.39 | m | 73.21 | b | 62.07 | b | 71.97 | e | ||
1993 | 62.07 | b | 61.88 | c | 74.57 | a | 82.07 | b | 83.68 | c | 92.59 | c | 90.10 | b | 97.48 | f | 92.00 | f | 83.12 | f | 72.68 | b | 68.73 | a | 76.49 | c |
1994 | 71.75 | g | 62.93 | 72.93 | b | 75.04 | e | 77.74 | 94.71 | f | 95.39 | 99.58 | 92.03 | 79.24 | b | 65.17 | 66.00 | d | 78.61 | b | ||||||
1995 | 60.41 | d | 73.14 | f | 65.68 | i | 71.14 | i | 74.68 | c | 87.07 | c | 99.06 | 101.04 | g | 95.83 | a | 87.89 | c | 82.64 | b | 70.00 | f | 83.94 | e | |
1996 | 68.33 | d | 68.79 | a | 71.00 | a | 82.31 | d | 85.00 | g | 91.96 | b | 99.04 | e | 97.13 | p | 90.96 | e | 85.50 | e | 74.64 | b | 67.80 | k | 81.39 | c |
1997 | 62.48 | d | 69.35 | e | 79.38 | b | 78.45 | a | 90.78 | d | 85.77 | 94.26 | 98.59 | b | 94.04 | b | 82.85 | e | 74.04 | f | 64.32 | 81.84 | a | |||
1998 | 64.67 | a | 60.19 | a | ----- | z | 70.30 | g | 71.48 | h | 81.52 | c | 98.00 | d | 101.56 | d | 88.44 | c | 82.17 | a | 71.65 | d | 66.48 | b | 79.41 | c |
1999 | 69.26 | 69.15 | b | 66.17 | b | 67.69 | a | 80.78 | d | 90.08 | d | 94.52 | 98.52 | b | 92.10 | a | 91.14 | c | 84.27 | s | 70.61 | c | 80.91 | a | ||
2000 | 69.79 | b | 65.75 | a | 70.65 | 80.73 | d | 87.96 | c | 93.69 | d | 96.72 | b | 96.72 | b | 92.57 | b | 77.22 | d | 70.11 | b | 73.19 | d | 81.26 | ||
2001 | 63.80 | f | 60.67 | d | 70.67 | d | 73.18 | b | 90.96 | c | 94.81 | d | 95.16 | f | 100.38 | e | 95.90 | 87.82 | c | 74.54 | b | 68.50 | e | 81.74 | b | |
2002 | 70.40 | u | ----- | z | 73.56 | o | 76.83 | f | 82.34 | b | 92.16 | e | 98.68 | c | 96.30 | d | 95.77 | h | 77.41 | b | 76.00 | 63.65 | e | 83.79 | e | |
2003 | 77.58 | 64.70 | e | 73.00 | j | 69.11 | u | 91.13 | p | 86.50 | b | 99.10 | k | 99.66 | b | 98.08 | f | 93.35 | k | 68.04 | f | 67.96 | e | 79.28 | g | |
2004 | 68.65 | h | 65.14 | o | 81.43 | h | 79.82 | h | 86.00 | j | 90.24 | e | 96.61 | c | 96.46 | e | 92.42 | d | 78.96 | c | 67.30 | g | 67.92 | e | 87.10 | f |
2005 | 65.28 | b | 64.39 | j | 73.80 | p | 75.36 | h | 86.46 | e | 88.70 | c | 101.15 | k | 97.87 | h | 89.81 | d | 82.57 | a | 76.47 | ----- | z | 81.55 | f | |
2006 | 68.79 | l | 72.30 | a | ----- | z | 72.04 | f | ----- | z | 95.86 | a | 104.03 | 96.17 | a | 94.77 | h | 81.05 | k | 76.90 | 69.50 | c | 85.79 | f | ||
2007 | 65.14 | b | 70.12 | d | 80.33 | g | 77.57 | b | 85.84 | f | 95.70 | 99.16 | 100.65 | 90.30 | 84.52 | d | 79.26 | c | 63.32 | c | 82.57 | b | ||||
2008 | 62.81 | d | 67.07 | b | 73.19 | e | 77.17 | f | 79.55 | b | 97.57 | g | 98.35 | h | 99.12 | g | 96.44 | e | 89.66 | b | 79.21 | a | 68.00 | o | 78.28 | e |
2009 | 71.90 | 64.59 | a | 70.58 | e | 74.28 | a | 89.10 | 83.14 | b | 99.84 | 98.25 | c | 97.33 | 81.10 | 77.27 | 62.87 | 80.85 | ||||||||
2010 | 66.93 | a | 64.86 | 66.06 | m | 70.63 | 77.29 | 87.50 | 95.00 | 96.10 | 93.77 | 78.16 | 71.37 | 64.26 | 78.71 | a | ||||||||||
2011 | 66.10 | 62.04 | 68.84 | 74.37 | 76.77 | 85.97 | 94.48 | 98.84 | 94.07 | 86.17 | a | 70.83 | a | 66.00 | 78.71 | |||||||||||
2012 | 72.52 | 67.83 | 71.19 | 79.62 | a | 84.84 | 90.80 | 95.58 | 101.00 | 98.10 | 85.29 | 77.23 | 64.23 | 82.35 | ||||||||||||
2013 | 65.52 | 66.61 | 76.52 | 78.83 | 84.13 | 93.17 | 96.61 | 97.58 | 94.03 | 81.35 | 73.03 | 69.29 | 81.39 | |||||||||||||
2014 | 76.29 | 72.54 | 75.97 | a | 79.63 | 86.10 | 90.63 | 97.61 | 95.39 | 95.30 | 88.81 | 76.40 | 65.19 | 83.32 | ||||||||||||
2015 | 71.00 | 77.25 | 81.48 | 79.53 | 76.52 | 92.57 | 90.06 | 96.52 | 92.57 | 84.77 | 70.73 | 63.65 | 81.39 | |||||||||||||
2016 | 63.58 | 77.31 | 73.19 | 76.73 | 77.00 | 93.90 | 96.93 | a | 96.17 | a | 88.60 | 82.16 | 75.90 | 63.29 | 80.40 | |||||||||||
2017 | 59.59 | b | 64.89 | 76.48 | 79.27 | 81.03 | 94.07 | 98.87 | 97.23 | 88.30 | 87.19 | 77.40 | 74.39 | 81.56 | ||||||||||||
2018 | 72.29 | 68.68 | 69.16 | 78.77 | 78.65 | 91.10 | 99.94 | 96.94 | 94.30 | 80.87 | 75.44 | c | 65.94 | 81.01 | ||||||||||||
2019 | 65.29 | 57.71 | 67.29 | 77.07 | 72.16 | 87.90 | 96.48 | 98.77 | a | 90.17 | 84.61 | 77.10 | 62.94 | 78.12 | ||||||||||||
2020 | 67.77 | 70.66 | 65.50 | a | 72.83 | 86.23 | 88.23 | 97.16 | 100.32 | 98.20 | 88.61 | 75.73 | 68.90 | 81.68 | ||||||||||||
2021 | 67.71 | 68.79 | 67.58 | 78.07 | 81.68 | 94.57 | 98.94 | 96.71 | 92.83 | 79.13 | 81.13 | 63.52 | 80.89 | |||||||||||||
2022 | 68.94 | 69.96 | 74.71 | 78.40 | 81.68 | 95.00 | 96.68 | 99.39 | 92.90 | 83.39 | 68.63 | 63.50 | a | 81.10 | ||||||||||||
2023 | 60.35 | 61.82 | 60.71 | 76.67 | 77.03 | 81.10 | 100.29 | 96.71 | 85.90 | 85.06 | 74.73 | 70.06 | 77.54 | |||||||||||||
2024 | 64.52 | 62.31 | 65.56 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 64.13 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 66.93 | 67.77 | 70.60 | 77.26 | 82.37 | 90.70 | 97.36 | 98.09 | 92.78 | 84.12 | 74.38 | 66.67 | 80.90 | |||||||||||||
S.D. | 4.60 | 4.91 | 4.87 | 3.79 | 4.98 | 4.50 | 2.94 | 1.90 | 3.32 | 3.81 | 3.96 | 3.92 | 1.51 | |||||||||||||
SKEW | 0.23 | 0.27 | 0.31 | -0.65 | 0.03 | -0.50 | -0.60 | 0.19 | -0.50 | -0.03 | -0.16 | 0.58 | -0.82 | |||||||||||||
MAX | 77.58 | 79.12 | 81.48 | 85.13 | 93.00 | 98.65 | 104.03 | 101.62 | 98.20 | 91.14 | 82.64 | 76.04 | 83.32 | |||||||||||||
MIN | 56.61 | 57.71 | 60.71 | 67.69 | 72.16 | 81.10 | 90.06 | 94.23 | 85.23 | 77.22 | 65.17 | 59.14 | 77.54 | |||||||||||||
YRS | 39 | 39 | 35 | 35 | 37 | 40 | 37 | 34 | 37 | 36 | 41 | 39 | 18 |