YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.40 | 50.85 | 54.13 | j | ||
1962 | 50.48 | 53.64 | 53.21 | 70.15 | 71.82 | 81.87 | 87.92 | 89.57 | a | 82.63 | 72.31 | 63.85 | 55.58 | 69.42 | ||||||||||||
1963 | 48.65 | 59.16 | 57.81 | 62.82 | 76.55 | b | 78.78 | 89.00 | 83.66 | 83.50 | 74.35 | 59.90 | 52.71 | 68.91 | ||||||||||||
1964 | 47.77 | a | 48.66 | 54.23 | 63.10 | 72.68 | a | 81.00 | 88.83 | a | 83.92 | 79.02 | a | 75.55 | a | 55.58 | 51.12 | b | 66.79 | |||||||
1965 | 52.90 | 51.85 | a | 54.21 | 62.23 | 69.68 | a | 76.41 | b | 88.13 | a | 86.76 | 77.60 | 74.23 | 62.72 | 51.79 | 67.38 | |||||||||
1966 | 47.95 | 48.50 | 59.95 | a | 67.27 | 77.34 | 83.25 | 88.69 | 87.70 | a | 81.77 | 71.53 | 62.05 | 52.61 | 69.05 | |||||||||||
1967 | 52.48 | a | 54.75 | 61.89 | 60.23 | 73.61 | 79.52 | 88.70 | a | 87.79 | 83.72 | 74.42 | 63.75 | 47.39 | 69.02 | |||||||||||
1968 | 48.47 | 59.48 | 59.10 | a | 64.50 | 75.73 | 86.52 | b | 88.61 | ----- | z | ----- | z | ----- | z | 60.08 | f | 49.60 | e | 66.50 | d | |||||
1969 | 54.21 | b | 52.02 | g | 53.45 | c | 66.60 | 76.13 | 80.45 | 88.95 | 90.89 | 83.17 | 68.05 | 59.64 | b | 53.43 | b | 70.45 | a | |||||||
1970 | 50.86 | b | 58.43 | 55.39 | 60.52 | 75.97 | 84.48 | 89.56 | 87.78 | b | 78.34 | b | 66.47 | a | 60.57 | a | 51.80 | a | 68.35 | |||||||
1971 | 51.50 | b | 53.12 | 60.50 | b | 64.56 | e | 69.46 | c | 82.28 | 89.84 | 84.06 | 81.10 | 65.87 | 58.17 | 49.11 | 67.47 | |||||||||
1972 | 51.15 | 56.38 | e | 67.40 | b | 66.53 | a | 73.12 | c | 83.40 | a | 89.69 | b | 85.40 | b | 80.60 | d | 67.22 | a | 53.80 | b | 48.31 | b | 68.58 | ||
1973 | 47.98 | b | 52.88 | b | 50.74 | d | 61.04 | e | 75.54 | e | 83.96 | b | 87.66 | b | 87.02 | 81.05 | a | 72.92 | g | 58.32 | b | 54.26 | d | 67.31 | a | |
1974 | 50.04 | h | 52.61 | e | 61.08 | g | ----- | z | 75.18 | 87.55 | b | 86.91 | b | 84.00 | c | 80.73 | 72.05 | b | 56.54 | d | 47.19 | b | 71.42 | c | ||
1975 | 49.23 | c | 51.40 | c | 58.83 | y | 58.36 | e | 72.35 | 82.70 | 87.86 | m | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.81 | g | ||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | 56.82 | c | 65.43 | c | 72.75 | e | 80.20 | e | 86.75 | a | 87.44 | g | 80.60 | e | 69.71 | b | 56.87 | d | 50.52 | e | 68.85 | c |
1983 | 52.58 | a | 51.83 | a | 54.98 | 59.44 | c | 72.57 | b | 80.27 | 87.74 | b | 86.04 | f | 84.83 | c | 70.17 | a | 57.66 | a | 52.43 | d | 65.86 | a | ||
1984 | 53.71 | b | 54.91 | b | 59.98 | k | 63.74 | e | 78.88 | a | 81.42 | e | 86.04 | h | 84.57 | c | 81.27 | f | 63.82 | n | 58.43 | p | 44.67 | y | 69.54 | f |
1985 | 50.00 | p | 48.88 | o | 56.61 | h | 67.36 | h | 74.37 | d | 84.80 | g | 88.58 | f | 86.34 | f | 75.13 | g | 68.60 | e | 55.39 | c | 51.98 | c | 62.58 | h |
1986 | 57.05 | b | 52.04 | n | 61.52 | j | 66.53 | a | 73.71 | b | 85.08 | e | 85.14 | c | 88.56 | d | 76.71 | a | 69.29 | b | 60.62 | 53.24 | d | 71.59 | b | |
1987 | 50.52 | b | 53.94 | a | 56.39 | c | 71.72 | 75.53 | 85.95 | a | 86.88 | b | 86.66 | 81.77 | 75.48 | 57.85 | 49.41 | c | 69.34 | |||||||
1988 | 50.69 | b | 57.47 | 60.18 | 66.23 | 75.60 | 86.12 | 89.53 | 87.03 | 81.41 | a | 76.47 | 59.05 | a | 51.87 | a | 70.14 | |||||||||
1989 | 51.47 | 56.32 | 64.35 | 73.88 | 76.77 | 84.43 | 90.87 | 86.15 | a | 83.02 | 71.55 | a | 62.55 | a | 52.81 | 71.18 | ||||||||||
1990 | 51.10 | a | 51.62 | 60.90 | a | 68.48 | 73.32 | a | 87.43 | 87.32 | 84.23 | 81.84 | a | 73.32 | 62.09 | a | 48.30 | a | 69.16 | |||||||
1991 | 51.34 | 60.95 | 53.10 | a | 64.57 | 72.50 | 81.14 | a | 88.27 | 88.58 | 82.53 | 74.76 | b | 59.17 | a | 53.03 | 69.16 | |||||||||
1992 | 51.56 | 56.43 | 58.18 | 69.83 | 76.19 | 82.70 | 87.27 | 85.98 | 83.36 | a | 73.71 | 56.76 | a | 49.92 | a | 69.33 | ||||||||||
1993 | 53.10 | a | 53.00 | 60.05 | 67.75 | 77.85 | 83.90 | 86.55 | 86.73 | 82.45 | 71.19 | b | 56.96 | b | 53.37 | d | 69.41 | |||||||||
1994 | 53.88 | b | 53.36 | 62.23 | 68.33 | 74.00 | 88.45 | 90.05 | 91.08 | 84.13 | 69.57 | a | 56.17 | a | 53.83 | b | 70.42 | |||||||||
1995 | 51.25 | a | 60.11 | a | 60.19 | 63.80 | 70.55 | 81.90 | 90.35 | a | 90.68 | 84.88 | 73.78 | a | 64.42 | 54.70 | a | 70.55 | ||||||||
1996 | 54.19 | 59.10 | 61.06 | 69.63 | 77.98 | a | 87.45 | b | 90.46 | e | 88.24 | f | 77.88 | e | 72.48 | h | 62.02 | f | 54.44 | g | 72.22 | d | ||||
1997 | 51.75 | g | 55.39 | j | 64.98 | b | 64.57 | c | 81.43 | d | 82.34 | e | 89.28 | f | 88.93 | c | 85.52 | c | 70.67 | g | 60.81 | f | 50.41 | i | 77.96 | f |
1998 | 52.25 | e | 48.96 | e | 57.04 | f | 62.80 | j | 70.88 | e | 81.20 | e | 90.09 | i | 89.70 | c | 84.21 | f | 70.40 | g | 60.50 | d | 52.83 | g | 67.25 | f |
1999 | 55.29 | g | 57.36 | c | 61.33 | h | 61.72 | l | 73.15 | d | 84.27 | d | 86.13 | d | 88.05 | b | 82.75 | b | 76.54 | d | 67.61 | h | 52.12 | g | 78.32 | e |
2000 | 56.22 | b | 58.30 | f | 60.17 | g | 71.09 | h | 80.10 | g | 86.21 | d | 89.89 | c | 89.00 | g | 86.04 | d | 68.59 | h | 52.11 | b | 55.09 | h | 74.09 | g |
2001 | 49.82 | f | 52.95 | h | 61.05 | c | 67.93 | i | 82.10 | e | 87.23 | f | 89.29 | g | 88.22 | d | 86.19 | f | 74.41 | d | 63.15 | c | 49.88 | f | 73.79 | g |
2002 | 51.30 | h | 57.12 | d | 60.91 | h | 71.21 | f | 77.44 | e | 87.44 | c | 90.46 | c | 88.63 | d | 84.19 | f | 69.42 | e | 62.02 | e | 52.02 | i | 76.08 | e |
2003 | 59.04 | f | 53.60 | c | 58.29 | e | 65.30 | g | 79.42 | g | 85.67 | d | 91.36 | f | 90.00 | k | 85.46 | f | 78.36 | f | 57.61 | g | 53.14 | f | 65.85 | i |
2004 | 52.93 | d | 53.26 | d | 69.57 | i | 67.67 | d | 78.09 | d | 86.78 | c | 91.38 | g | 89.59 | c | 84.04 | e | 71.45 | c | 56.34 | e | 52.34 | l | 71.13 | c |
2005 | 53.80 | f | 55.02 | c | 59.12 | a | 68.50 | f | 77.92 | f | 86.25 | d | 91.69 | g | 87.91 | d | 84.72 | a | 73.72 | d | 63.48 | c | 53.74 | b | 70.50 | d |
2006 | 55.37 | d | 57.89 | a | 57.19 | d | 68.54 | e | 80.62 | c | 89.70 | b | 90.48 | e | 88.53 | 79.84 | b | 71.45 | b | 63.96 | c | 50.42 | g | 73.05 | a | |
2007 | 49.30 | f | 55.44 | c | 65.40 | b | 68.13 | d | 79.81 | e | 86.67 | a | 90.73 | c | 91.12 | b | 84.62 | b | 73.45 | b | 67.07 | c | 48.55 | c | 73.73 | a |
2008 | 49.28 | b | 53.15 | b | 62.32 | c | 68.66 | e | 74.40 | g | 87.73 | b | 90.29 | b | 88.71 | c | 84.88 | a | 74.15 | e | 63.08 | 51.85 | 70.37 | a | ||
2009 | 55.57 | c | 56.65 | a | 62.73 | 67.25 | b | 80.31 | 82.47 | a | 92.36 | b | 89.74 | b | 85.30 | 69.54 | d | 64.09 | c | 49.76 | d | 71.31 | ||||
2010 | 53.09 | d | 54.10 | b | 57.96 | f | 64.06 | c | 71.80 | f | 85.34 | e | 91.91 | h | 89.02 | d | 87.02 | b | 72.61 | d | 59.07 | b | 57.50 | i | 70.54 | d |
2011 | 52.86 | b | 51.41 | f | 63.07 | b | 68.12 | f | 73.30 | h | 83.79 | b | 88.42 | f | 92.15 | h | 86.05 | h | 74.31 | j | 60.02 | g | 50.52 | h | 66.57 | i |
2012 | 54.91 | i | 56.76 | h | 60.75 | e | 69.74 | i | 78.89 | h | 86.95 | i | 88.60 | f | 91.00 | k | 83.32 | h | 74.93 | i | 66.20 | g | 51.69 | j | 60.75 | k |
2013 | 50.52 | f | 52.02 | b | 64.75 | e | 68.63 | g | 78.27 | i | 88.60 | f | 88.97 | l | 90.20 | d | 83.02 | c | 68.67 | k | 63.22 | g | 53.04 | h | 72.50 | h |
2014 | 56.61 | i | 59.80 | a | 64.27 | e | 69.07 | g | 76.02 | j | 86.56 | d | 90.46 | d | 85.44 | f | 84.13 | d | 75.40 | a | 61.78 | a | 54.09 | b | 72.06 | d |
2015 | 53.00 | y | 60.98 | c | 66.55 | b | 68.04 | d | 72.18 | a | 87.96 | b | 88.50 | c | 92.02 | a | 85.55 | a | 74.42 | 58.22 | c | 50.62 | a | 73.19 | a | |
2016 | 50.91 | b | 61.52 | 64.88 | b | 68.45 | a | 74.26 | b | 89.72 | a | 91.90 | b | 88.05 | b | 82.50 | a | 77.58 | a | 63.79 | a | 55.70 | c | 72.44 | ||
2017 | 51.34 | b | 58.31 | b | 65.93 | a | 69.32 | e | 77.00 | b | 89.23 | 90.53 | b | 90.16 | 82.73 | b | 78.04 | f | 68.04 | c | 58.26 | f | 74.26 | b | ||
2018 | 58.04 | c | 56.12 | 62.38 | a | 72.33 | a | 77.97 | b | 87.13 | 92.18 | c | 88.97 | a | 86.72 | c | 69.28 | a | 59.91 | c | 53.30 | c | 72.03 | |||
2019 | 52.86 | b | 49.71 | b | 60.48 | b | 69.25 | b | 70.12 | b | 84.54 | b | 91.28 | b | 91.97 | b | 82.35 | c | 71.21 | 62.05 | b | 52.69 | b | 69.88 | ||
2020 | 53.73 | c | 54.50 | d | 58.52 | c | 68.93 | a | 80.85 | e | 86.03 | a | 92.89 | c | 94.07 | d | 86.66 | e | 78.10 | a | 66.84 | e | 53.85 | a | 72.91 | |
2021 | 53.44 | f | 56.20 | a | 60.25 | c | 71.20 | b | 76.25 | c | 88.53 | k | 88.08 | m | 88.59 | c | 84.24 | c | 70.27 | a | 66.31 | d | 55.46 | d | 69.86 | c |
2022 | 56.86 | m | 56.71 | b | 64.02 | b | 71.64 | e | 79.95 | c | 90.02 | a | 91.97 | b | 88.97 | b | 85.95 | a | 72.42 | a | 56.43 | a | 51.88 | e | 73.63 | a |
2023 | 50.16 | b | 52.62 | b | 56.95 | b | 68.20 | c | 77.04 | d | 82.13 | 96.05 | b | 92.81 | b | 84.54 | g | 76.48 | 65.23 | h | 57.50 | b | 70.99 | b | ||
2024 | 50.76 | b | 55.93 | 58.85 | 67.38 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.18 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 51.99 | 55.14 | 59.98 | 66.59 | 75.47 | 84.47 | 89.42 | 88.28 | 82.83 | 72.36 | 60.35 | 52.00 | 69.66 | |||||||||||||
S.D. | 2.43 | 3.32 | 4.00 | 3.63 | 3.26 | 3.11 | 2.10 | 2.45 | 2.50 | 3.00 | 3.68 | 2.41 | 1.57 | |||||||||||||
SKEW | 0.37 | -0.02 | -0.25 | -0.36 | 0.11 | -0.25 | 0.54 | -0.04 | -0.53 | -0.19 | 0.05 | -0.12 | 0.33 | |||||||||||||
MAX | 58.04 | 61.52 | 67.40 | 73.88 | 82.10 | 90.02 | 96.05 | 94.07 | 87.02 | 78.10 | 68.04 | 57.50 | 72.91 | |||||||||||||
MIN | 47.77 | 48.50 | 50.74 | 58.36 | 69.46 | 76.41 | 85.14 | 83.66 | 76.71 | 65.87 | 52.11 | 47.19 | 66.79 | |||||||||||||
YRS | 41 | 48 | 46 | 43 | 47 | 51 | 42 | 45 | 45 | 43 | 46 | 40 | 23 |