YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1959 | ----- | z | 52.41 | k | 57.77 | 65.38 | 67.77 | 80.45 | 81.19 | 76.89 | 75.15 | 67.39 | 57.57 | 50.31 | 67.99 | b | ||||||||||
1960 | 45.61 | 47.24 | 59.18 | 62.90 | 68.60 | 81.10 | 81.73 | 78.66 | 77.05 | 64.44 | 57.90 | 48.75 | a | 64.43 | ||||||||||||
1961 | 51.61 | 52.54 | 55.73 | 64.20 | 68.48 | 79.65 | 79.81 | 76.95 | a | 72.42 | 65.60 | 52.78 | 48.45 | 64.02 | ||||||||||||
1962 | 47.71 | 52.34 | 50.23 | 65.43 | 66.52 | 75.50 | 80.16 | 82.03 | 76.20 | 67.27 | 58.65 | 51.24 | 64.44 | |||||||||||||
1963 | 46.40 | 55.20 | 54.94 | 60.92 | 71.44 | 74.52 | 82.21 | 77.03 | 76.68 | 69.66 | 56.41 | a | 51.15 | 64.71 | ||||||||||||
1964 | 46.45 | 46.28 | 51.29 | 58.53 | 67.55 | 75.10 | a | 80.68 | a | 76.23 | 71.67 | 67.92 | 52.15 | 49.94 | 61.98 | |||||||||||
1965 | 51.16 | 48.44 | b | 51.24 | b | 59.88 | b | 63.71 | b | 70.38 | 79.23 | a | 77.65 | 71.92 | 68.63 | a | 57.93 | b | 47.67 | d | 62.32 | |||||
1966 | 45.27 | 46.48 | 57.94 | 62.17 | 70.74 | b | 77.58 | 81.11 | 76.97 | 74.67 | 65.48 | 58.98 | 50.13 | 63.96 | ||||||||||||
1967 | 49.95 | 53.04 | 58.45 | 57.63 | 68.38 | b | 75.40 | 80.47 | 79.44 | 75.52 | 68.87 | 60.23 | 46.71 | 64.51 | ||||||||||||
1968 | 50.10 | 56.17 | 54.31 | 59.38 | 68.29 | 79.15 | 79.18 | 75.77 | 75.68 | 68.18 | 55.82 | 48.73 | 64.23 | |||||||||||||
1969 | 53.10 | 49.91 | 51.94 | 62.75 | 69.55 | 74.87 | 81.02 | 80.89 | 76.55 | 64.15 | 56.47 | 51.29 | 64.37 | |||||||||||||
1970 | 49.26 | 54.71 | 52.65 | 57.70 | 70.02 | 77.97 | 82.00 | 79.79 | 73.40 | 62.60 | 58.30 | 51.61 | 64.17 | |||||||||||||
1971 | 51.02 | 50.54 | 57.73 | 59.81 | a | 64.45 | 76.43 | 81.73 | 76.03 | 75.40 | 61.39 | 54.62 | 46.35 | 62.96 | ||||||||||||
1972 | 49.77 | 54.22 | 62.11 | 63.03 | 66.97 | 77.30 | 83.10 | 78.67 | a | 75.35 | 65.32 | a | 50.95 | a | 48.35 | a | 64.60 | |||||||||
1973 | 46.79 | 51.11 | 48.83 | a | 57.92 | 69.90 | 79.37 | 80.60 | 79.87 | 76.07 | 68.28 | b | 56.13 | 52.15 | 63.92 | |||||||||||
1974 | 48.90 | a | 50.07 | 57.68 | 64.53 | 70.03 | 82.12 | 79.44 | 78.82 | 74.18 | 65.97 | 55.47 | 46.26 | 64.46 | ||||||||||||
1975 | 49.42 | a | 50.00 | 53.87 | 55.88 | 66.16 | 77.16 | a | ----- | z | 79.98 | d | 74.33 | d | 65.73 | c | 56.42 | d | 49.72 | b | 61.70 | a | ||||
1976 | 50.94 | 53.61 | b | 55.76 | b | 59.86 | h | 67.98 | a | 76.41 | b | 77.93 | a | 79.13 | d | 72.54 | b | 63.47 | 56.79 | b | 49.67 | j | 65.46 | b | ||
1977 | 48.48 | f | 54.00 | c | 51.48 | e | 63.18 | m | 64.38 | f | 78.29 | a | 80.30 | a | 78.68 | a | 76.66 | e | ----- | z | ----- | z | 53.59 | b | 67.57 | e |
1978 | 50.29 | c | 49.74 | a | 56.26 | b | 59.93 | c | 67.14 | c | 80.28 | 80.93 | b | 79.33 | b | 74.07 | a | 69.94 | d | 53.48 | 45.02 | e | 63.87 | |||
1979 | 43.50 | i | ----- | z | 49.87 | 60.34 | e | ----- | z | 78.44 | e | 82.19 | e | ----- | z | 77.57 | 70.76 | ----- | z | ----- | z | 69.86 | f | |||
1980 | ----- | z | 53.52 | c | 53.40 | e | 61.09 | g | 65.86 | j | 80.02 | e | 83.42 | a | 80.27 | g | 77.05 | 66.73 | a | 55.00 | h | 55.45 | j | 69.02 | f | |
1981 | 52.05 | 55.52 | d | 52.79 | c | 64.28 | c | 65.92 | a | 81.15 | 80.81 | 81.44 | e | 75.91 | c | 64.23 | 60.27 | 54.61 | 65.75 | |||||||
1982 | 49.79 | c | 53.17 | e | 54.55 | b | 62.92 | 68.64 | b | 74.75 | 80.05 | a | 79.68 | 76.68 | b | 66.52 | a | 54.98 | a | 48.23 | a | 64.16 | ||||
1983 | 49.77 | c | 51.36 | 53.67 | d | 55.67 | a | 67.38 | b | 74.28 | a | 80.98 | c | 76.66 | 77.21 | a | 64.29 | g | 54.34 | b | 53.08 | a | 63.13 | a | ||
1984 | 49.97 | 52.64 | a | 57.34 | 60.33 | f | 74.62 | b | 76.31 | d | 77.02 | a | 76.02 | a | 75.79 | a | 63.06 | 55.80 | 50.06 | d | 64.42 | a | ||||
1985 | 47.10 | 50.41 | 55.42 | r | 64.30 | c | 68.36 | f | 81.14 | e | 80.77 | a | 79.15 | 70.90 | 65.87 | d | 54.50 | 51.94 | 64.61 | b | ||||||
1986 | 56.00 | 54.68 | 58.76 | 62.87 | 69.35 | 78.62 | 78.52 | 78.88 | a | 71.53 | 64.35 | 56.52 | 49.48 | 64.96 | ||||||||||||
1987 | 48.10 | b | 49.17 | a | 52.60 | 64.00 | 65.35 | 77.18 | 79.08 | 76.50 | 72.66 | a | 69.55 | 53.88 | 47.58 | 62.97 | ||||||||||
1988 | 48.68 | 53.55 | 55.18 | 60.07 | 67.69 | 77.82 | 79.87 | 77.42 | a | 73.22 | 69.13 | 55.27 | 48.15 | 63.84 | ||||||||||||
1989 | 47.48 | ----- | z | 57.50 | v | 66.97 | 69.89 | 77.87 | 82.14 | c | 77.65 | 75.67 | a | 66.00 | 57.72 | e | 50.85 | d | 67.22 | b | ||||||
1990 | 48.10 | b | 48.62 | b | 56.12 | a | 62.03 | 67.28 | a | 81.17 | 77.52 | b | 75.71 | c | 73.93 | c | 66.05 | a | 56.93 | 47.67 | d | 63.43 | ||||
1991 | 47.95 | 54.19 | b | 49.86 | b | 58.33 | a | 65.67 | b | 72.65 | 79.89 | 79.47 | b | 72.89 | b | 68.64 | b | 54.68 | 48.17 | a | 62.70 | |||||
1992 | 47.53 | b | 51.44 | d | 52.55 | 62.37 | d | 68.50 | f | 76.18 | 79.31 | e | 76.06 | 75.64 | a | 67.86 | b | 52.48 | c | 47.56 | 62.64 | a | ||||
1993 | 49.93 | a | 49.22 | a | 55.39 | c | 62.17 | a | 68.81 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.18 | h |
1994 | 50.05 | b | 48.94 | a | 57.10 | b | 61.92 | 67.61 | 81.30 | 83.44 | 81.98 | a | 76.27 | 65.36 | b | 53.00 | 50.15 | a | 64.76 | |||||||
1995 | 48.15 | a | 55.56 | a | 55.68 | 58.38 | 64.60 | 74.59 | a | 82.40 | 81.38 | a | 76.53 | 68.66 | 60.47 | 50.81 | d | 64.77 | ||||||||
1996 | 51.15 | 56.66 | a | 56.55 | 66.10 | 71.82 | 81.08 | 81.50 | 80.65 | 72.88 | a | 67.75 | c | 57.08 | 52.30 | c | 66.29 | |||||||||
1997 | ----- | z | ----- | z | 62.52 | f | 61.07 | c | 73.05 | 75.21 | d | 81.70 | c | 81.11 | l | 76.62 | f | 65.17 | b | 64.15 | t | 44.93 | d | 66.85 | f | |
1998 | 51.22 | h | 46.35 | d | 52.81 | b | 54.81 | f | 64.52 | g | 74.88 | b | 82.10 | b | 79.31 | d | 76.84 | e | 64.89 | i | 57.89 | h | 48.24 | h | 68.72 | f |
1999 | 51.29 | b | 55.27 | f | 56.41 | d | 57.02 | f | 66.86 | j | 75.40 | i | 78.30 | i | 78.68 | i | 76.06 | f | 70.60 | k | 61.76 | e | 50.46 | g | 56.49 | i |
2000 | 51.79 | j | 53.50 | d | 54.31 | e | 65.18 | b | 73.71 | e | 78.37 | c | 80.67 | e | 77.48 | d | 77.78 | g | 64.44 | e | ----- | z | 53.18 | i | 68.46 | d |
2001 | 45.77 | a | 48.37 | a | 53.00 | n | 59.55 | b | 72.50 | d | 78.71 | f | 79.15 | n | 77.40 | p | 77.33 | c | 67.54 | e | 59.27 | b | 47.39 | d | 59.71 | d |
2002 | 50.30 | c | 53.06 | b | 53.38 | f | 64.75 | j | 69.12 | a | 82.15 | c | 80.41 | b | 80.10 | e | 76.38 | f | 63.72 | a | 58.72 | a | 47.10 | b | 64.96 | c |
2003 | 55.62 | f | 50.00 | i | 54.43 | c | 59.00 | j | 69.60 | f | 78.22 | e | 84.90 | f | 79.88 | c | 77.35 | 69.77 | a | 54.91 | a | 51.25 | a | 66.54 | e | |
2004 | 49.83 | b | 47.07 | 63.75 | g | 60.12 | f | 70.46 | h | 76.91 | c | 79.06 | e | 77.76 | f | 74.42 | f | 65.27 | i | 51.73 | d | 49.93 | d | 59.09 | f | |
2005 | 49.80 | h | 50.41 | 53.73 | c | 62.14 | b | 70.79 | 76.12 | 82.45 | a | 77.83 | b | 78.02 | b | 67.45 | 59.60 | 52.47 | 66.46 | a | ||||||
2006 | 52.05 | a | 54.50 | 53.45 | 62.83 | a | 72.06 | 81.33 | 82.55 | b | 78.00 | 72.22 | 65.57 | a | ----- | z | 48.65 | 65.75 | a | |||||||
2007 | 44.94 | 52.11 | 59.16 | 62.48 | 69.68 | 79.45 | a | 81.35 | 78.71 | 75.37 | 67.40 | 61.37 | 46.97 | 64.92 | ||||||||||||
2008 | 48.45 | ----- | z | 56.68 | a | 62.77 | 66.45 | 80.40 | a | ----- | z | 78.05 | ----- | z | ----- | z | ----- | z | ----- | z | 65.47 | f | ||||
2009 | 53.68 | ----- | z | 58.45 | a | 61.50 | a | 72.53 | 74.43 | 83.52 | a | 80.67 | d | 76.71 | d | 64.29 | ----- | z | ----- | z | 69.53 | c | ||||
2010 | 50.50 | 49.21 | 53.97 | 59.20 | c | 66.18 | 77.80 | 83.48 | 82.02 | d | 79.41 | a | 66.75 | a | 54.84 | a | 56.00 | a | 64.95 | |||||||
2011 | 51.36 | i | 48.08 | b | 59.03 | 64.73 | 66.78 | b | 79.62 | 82.39 | 83.05 | a | 77.39 | b | 69.25 | a | 54.12 | f | 44.93 | h | 70.03 | c | ||||
2012 | 53.79 | c | 51.13 | c | 54.30 | f | 64.52 | f | 72.48 | d | 81.30 | 80.19 | b | 80.82 | 75.59 | a | 68.17 | a | 61.45 | b | 49.82 | 67.47 | b | |||
2013 | 47.35 | 47.21 | 59.56 | f | 63.79 | f | 69.97 | n | 81.12 | f | 81.92 | f | 80.50 | h | 76.45 | 65.05 | 59.82 | 50.19 | 57.68 | f | ||||||
2014 | 54.44 | 56.43 | 58.29 | 62.67 | 68.89 | 81.31 | a | 81.42 | a | 77.69 | 75.34 | a | 68.45 | a | 57.50 | 50.77 | 66.10 | |||||||||
2015 | 51.80 | a | 57.56 | a | 60.45 | 61.47 | a | 64.03 | a | 80.95 | 79.19 | 81.56 | 76.41 | b | 67.73 | 54.80 | 48.85 | 65.40 | ||||||||
2016 | 49.53 | 58.47 | 59.44 | 61.75 | 66.35 | 81.85 | 84.70 | a | 78.05 | b | 73.90 | 71.08 | a | 59.52 | 52.56 | 66.43 | ||||||||||
2017 | 48.66 | 53.98 | a | 62.42 | 64.52 | 69.05 | 82.13 | 80.79 | 80.00 | 75.57 | 71.82 | 65.17 | 53.68 | 67.32 | ||||||||||||
2018 | 55.55 | 52.64 | 58.48 | 66.98 | a | 71.13 | 81.52 | 83.02 | a | 80.40 | a | 78.93 | a | 65.53 | a | 55.90 | 50.60 | 66.72 | ||||||||
2019 | 50.44 | 47.25 | 57.87 | 63.43 | a | 63.65 | 76.08 | 84.60 | a | 83.66 | 76.38 | a | 65.89 | 60.48 | a | 50.38 | a | 65.01 | ||||||||
2020 | 51.83 | b | 52.00 | 54.79 | 62.72 | a | 73.52 | 79.63 | 85.27 | a | 85.74 | 79.60 | 73.20 | a | 61.24 | a | 50.67 | a | 67.52 | |||||||
2021 | 50.29 | 52.93 | 55.75 | a | 65.83 | a | 70.58 | 82.92 | 80.13 | a | 79.19 | b | 76.58 | 65.77 | 63.12 | 53.11 | 66.35 | |||||||||
2022 | 51.16 | 51.20 | 56.87 | 65.71 | a | 71.21 | 81.27 | 82.34 | 78.29 | 76.32 | 66.15 | 52.97 | 50.35 | 65.32 | ||||||||||||
2023 | 47.45 | 47.73 | 53.71 | 62.52 | 68.50 | 71.46 | q | 87.27 | c | 84.33 | e | 78.64 | a | 70.98 | 60.62 | a | 53.10 | 64.99 | a | |||||||
2024 | 48.61 | 53.03 | 53.84 | 60.07 | 65.12 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.89 | h | ||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 49.70 | 51.70 | 55.43 | 62.00 | 68.74 | 78.29 | 81.21 | 79.16 | 75.49 | 66.93 | 57.03 | 49.94 | 64.66 | |||||||||||||
S.D. | 2.45 | 3.06 | 3.04 | 2.70 | 2.71 | 2.80 | 1.91 | 2.22 | 2.03 | 2.42 | 3.12 | 2.39 | 1.29 | |||||||||||||
SKEW | 0.35 | 0.02 | 0.02 | -0.30 | 0.12 | -0.41 | 0.49 | 0.66 | -0.35 | 0.22 | 0.25 | 0.11 | 0.21 | |||||||||||||
MAX | 56.00 | 58.47 | 62.42 | 66.98 | 74.62 | 82.92 | 87.27 | 85.74 | 79.60 | 73.20 | 65.17 | 56.00 | 67.52 | |||||||||||||
MIN | 44.94 | 46.28 | 48.83 | 55.67 | 63.65 | 70.38 | 77.02 | 75.71 | 70.90 | 61.39 | 50.95 | 44.93 | 61.98 | |||||||||||||
YRS | 56 | 58 | 58 | 55 | 54 | 60 | 58 | 57 | 58 | 58 | 54 | 55 | 37 |