YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 73.31 | 69.72 | 64.35 | 59.18 | 59.71 | 65.25 | g | |||||
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 | 59.72 | o | 63.48 | 67.48 | 70.29 | 68.27 | 63.45 | 56.81 | a | 54.19 | 63.43 | e | ||||||
1963 | 52.45 | a | 60.11 | 54.65 | 55.17 | 62.03 | a | 63.83 | 67.97 | 70.48 | 73.19 | a | 66.06 | 58.32 | 55.89 | 61.68 | ||||||||||
1964 | 51.97 | ----- | z | 56.12 | j | 57.98 | 58.95 | 62.88 | 68.70 | a | 69.95 | 66.85 | 68.17 | a | 57.98 | 54.79 | 61.82 | b | ||||||||
1965 | 54.82 | a | 54.48 | 55.45 | 57.72 | 60.32 | 61.66 | a | 66.74 | 72.32 | 67.00 | a | 68.82 | 59.20 | 59.85 | r | 61.68 | a | ||||||||
1966 | 51.64 | j | 51.80 | 55.84 | 59.80 | b | 61.75 | a | 65.32 | 68.11 | 71.82 | 68.62 | 67.60 | p | 59.20 | 55.45 | 61.77 | b | ||||||||
1967 | 53.53 | b | 56.22 | a | 55.58 | a | 51.12 | 61.50 | b | 61.42 | f | 69.48 | 73.32 | 70.98 | ----- | z | 62.58 | 52.65 | a | 60.70 | b | |||||
1968 | 54.61 | 57.79 | 56.55 | 58.85 | 60.84 | b | 65.08 | 70.48 | a | 70.02 | 69.55 | ----- | z | 59.82 | 52.80 | a | 61.49 | a | ||||||||
1969 | 55.45 | 51.80 | 53.74 | 59.10 | 62.30 | a | 64.63 | 70.15 | 73.50 | 69.70 | 63.26 | 62.05 | a | 55.08 | 61.73 | |||||||||||
1970 | 54.17 | a | 57.95 | 57.00 | 57.09 | a | 62.55 | a | 65.66 | a | 71.10 | a | 72.27 | 68.78 | a | 63.90 | a | 58.13 | 52.38 | a | 61.75 | |||||
1971 | 53.35 | 52.63 | b | 55.37 | 56.57 | 59.06 | 63.92 | 70.00 | 74.70 | f | 71.37 | 65.70 | c | 54.44 | m | 49.98 | 59.80 | b | ||||||||
1972 | 52.20 | a | 55.62 | 58.21 | 58.73 | 63.03 | 66.94 | c | 71.93 | a | 72.69 | ----- | z | 64.30 | a | 57.88 | 53.90 | 61.40 | a | |||||||
1973 | 51.16 | c | 54.92 | d | 52.69 | 57.41 | c | 61.82 | c | 66.95 | a | 68.71 | e | 69.57 | a | 67.03 | ----- | z | 56.97 | 56.10 | 60.30 | a | ||||
1974 | 53.52 | 55.19 | a | 55.90 | 58.41 | a | 61.32 | 66.30 | 70.12 | a | 68.48 | 68.85 | 63.82 | 60.22 | 53.32 | 61.29 | ||||||||||
1975 | 54.77 | a | 51.52 | a | 53.22 | a | 53.55 | 59.16 | 62.10 | 68.00 | a | 66.58 | 69.52 | c | 62.23 | a | 58.14 | a | 54.05 | 59.40 | ||||||
1976 | 57.47 | a | 55.05 | 55.57 | a | 55.21 | a | 62.32 | a | 66.82 | 70.03 | 69.32 | 69.85 | 67.18 | 64.00 | 58.45 | a | 62.60 | ||||||||
1977 | 55.60 | a | 58.50 | 53.00 | 58.50 | 58.27 | 64.67 | 69.56 | 71.71 | 68.30 | 65.05 | 62.22 | 58.95 | 62.03 | ||||||||||||
1978 | 55.33 | a | 56.16 | 58.79 | 57.15 | 64.95 | 69.32 | 69.97 | 70.27 | 72.27 | 67.87 | 57.20 | 52.42 | 62.64 | ||||||||||||
1979 | 51.82 | 52.66 | 55.21 | 59.70 | 63.55 | 68.30 | 69.18 | 70.39 | 75.67 | 65.71 | 59.87 | 59.31 | 62.61 | |||||||||||||
1980 | 58.05 | 60.21 | 57.02 | 60.20 | 59.48 | 65.71 | a | 71.94 | 72.52 | 68.87 | 66.27 | a | 62.09 | a | 60.55 | 63.57 | ||||||||||
1981 | 57.92 | 60.27 | 56.95 | 61.95 | 64.63 | 72.02 | 73.34 | 74.32 | 71.57 | 64.32 | 61.22 | 57.50 | 64.67 | |||||||||||||
1982 | 54.63 | a | 60.46 | 56.39 | c | 60.12 | 63.28 | b | 64.28 | 71.10 | 73.61 | 71.81 | c | 68.40 | 59.35 | 55.05 | 63.21 | |||||||||
1983 | 58.73 | 57.54 | a | 58.00 | 58.80 | b | 64.40 | 66.30 | b | 70.93 | a | 76.97 | a | 75.25 | 70.61 | 60.68 | 56.92 | 64.59 | ||||||||
1984 | 58.67 | a | 57.62 | 60.87 | a | 61.52 | a | 67.72 | a | 68.62 | 76.53 | 75.71 | 78.21 | b | 66.34 | b | 58.13 | 54.50 | 65.37 | |||||||
1985 | 55.02 | a | 55.61 | 54.98 | b | 63.44 | d | 63.98 | b | 69.33 | 76.17 | a | 73.37 | 69.66 | a | 67.15 | a | 58.17 | 58.06 | 63.74 | ||||||
1986 | 61.88 | a | 58.16 | 59.91 | b | 61.91 | a | 64.74 | 68.93 | 70.67 | b | 73.50 | 67.52 | a | 65.56 | 63.10 | a | 57.07 | a | 64.41 | ||||||
1987 | 54.24 | b | 56.00 | a | 57.34 | c | 63.80 | 64.81 | ----- | z | 67.32 | a | 69.98 | 70.92 | 69.55 | a | ----- | z | 51.77 | a | 62.57 | b | ||||
1988 | 55.41 | b | 59.43 | a | 61.42 | 61.23 | 64.28 | a | 65.15 | 71.21 | 71.23 | 68.57 | b | 66.81 | 59.37 | 55.39 | 63.29 | |||||||||
1989 | 54.13 | 54.71 | 58.58 | a | 64.89 | b | 63.05 | 66.41 | a | 71.52 | a | 70.74 | b | 70.65 | 65.68 | 63.58 | 58.85 | 63.57 | ||||||||
1990 | 55.95 | 53.25 | 57.31 | 62.32 | 63.98 | c | 70.07 | b | 73.73 | a | 71.83 | a | 72.26 | a | ----- | z | 62.42 | 55.45 | a | 63.51 | a | |||||
1991 | 55.98 | 59.30 | 54.71 | 60.42 | 63.08 | a | 65.85 | 69.53 | 71.72 | a | 71.59 | a | 69.89 | 63.26 | a | 57.03 | 63.53 | |||||||||
1992 | 58.00 | 59.89 | a | 58.44 | 66.20 | 67.85 | 68.70 | b | 74.18 | 76.85 | 74.62 | 68.52 | 62.07 | a | 54.47 | 65.82 | ||||||||||
1993 | 55.48 | 56.27 | 61.37 | 63.67 | ----- | z | 69.38 | b | 70.56 | 72.18 | 71.35 | 68.18 | a | 61.88 | 57.05 | 64.31 | a | |||||||||
1994 | 58.90 | 55.70 | 60.31 | d | 61.35 | 62.57 | a | 69.67 | a | 71.23 | a | 76.42 | 72.52 | 66.56 | 56.34 | a | 55.85 | 63.95 | ||||||||
1995 | 55.73 | 61.50 | 59.29 | 61.32 | 61.98 | a | 65.70 | 71.29 | 73.87 | 73.50 | 67.90 | a | 63.72 | 57.31 | 64.43 | |||||||||||
1996 | 58.08 | 58.57 | 59.65 | 65.08 | 67.10 | b | 69.86 | a | 73.10 | 74.95 | 71.87 | 64.81 | 62.55 | 57.72 | a | 65.28 | ||||||||||
1997 | 56.60 | 56.59 | 61.97 | a | 62.43 | 70.05 | 69.28 | 70.40 | 73.28 | b | 75.41 | a | 67.67 | a | 61.83 | d | 55.89 | 65.12 | ||||||||
1998 | 55.59 | b | 54.50 | a | 57.23 | a | ----- | z | 60.92 | 66.22 | 74.07 | a | 77.95 | 72.90 | 67.52 | 60.97 | 56.08 | 63.99 | a | |||||||
1999 | 57.08 | 56.07 | 55.90 | 59.18 | 63.34 | 67.05 | b | 72.74 | 72.48 | 69.97 | 72.30 | a | 62.23 | 59.34 | 63.97 | |||||||||||
2000 | 59.40 | a | 58.75 | a | 58.98 | 63.80 | 67.29 | 71.24 | a | 72.85 | 75.69 | 73.07 | 65.84 | 58.97 | a | 58.07 | a | 65.33 | ||||||||
2001 | 53.37 | 52.79 | b | 57.34 | 56.87 | 63.90 | a | 67.12 | a | 69.11 | 71.32 | a | 69.52 | 65.43 | a | 59.54 | b | 53.29 | 61.63 | |||||||
2002 | 54.64 | c | 57.90 | b | 55.88 | c | 59.17 | d | 61.98 | a | 65.84 | a | 69.72 | b | 68.92 | f | 70.96 | b | 62.34 | 63.17 | 54.37 | 61.45 | a | |||
2003 | 61.04 | c | 57.09 | a | 57.10 | b | 55.93 | c | 60.55 | b | 63.98 | b | 69.96 | c | 72.41 | b | 70.20 | 68.63 | a | 58.69 | c | 53.63 | 62.43 | |||
2004 | 54.84 | 54.04 | c | 60.64 | c | 60.56 | c | 65.48 | f | 66.56 | d | 69.56 | d | 68.64 | f | 72.96 | f | 63.58 | g | 56.37 | g | 55.52 | d | 60.24 | e | |
2005 | 56.27 | 56.30 | c | 58.10 | b | 60.03 | a | 64.36 | b | 65.45 | a | 71.19 | d | 71.56 | e | 68.62 | 65.45 | a | 63.36 | b | 57.94 | e | 63.22 | |||
2006 | 56.88 | b | 57.30 | e | 52.88 | c | 58.12 | e | 63.62 | e | 70.44 | d | 76.91 | b | 72.04 | d | 70.32 | h | 64.78 | d | 63.83 | i | 55.66 | b | 62.86 | b |
2007 | 54.03 | 55.20 | e | 57.89 | i | 58.98 | b | 61.35 | g | 65.37 | k | 69.88 | e | 72.52 | 71.40 | j | 66.70 | h | 60.08 | d | 53.32 | l | 61.78 | f | ||
2008 | 52.55 | k | 52.97 | l | 58.75 | m | 60.30 | e | 63.24 | j | 70.04 | g | 71.67 | p | 73.64 | m | 72.42 | e | 70.10 | j | 65.33 | g | 54.81 | d | 62.51 | i |
2009 | 58.82 | f | 55.14 | 58.27 | 61.28 | g | 65.29 | b | 66.67 | c | 72.92 | 74.44 | e | 74.48 | a | 66.58 | 61.23 | d | 54.95 | a | 65.00 | b | ||||
2010 | 57.15 | e | 56.23 | 58.85 | 58.52 | 61.77 | 65.28 | 67.88 | a | 70.06 | 71.18 | k | 64.24 | h | 60.84 | e | 56.40 | f | 61.84 | c | ||||||
2011 | 57.83 | h | 53.93 | f | 58.55 | 63.27 | h | 64.21 | j | 66.84 | e | 71.63 | 70.90 | 70.17 | f | 65.82 | 58.96 | d | 53.73 | 63.78 | e | |||||
2012 | 58.63 | e | 55.93 | f | 56.24 | 59.52 | d | 64.00 | 65.83 | a | 70.06 | 75.35 | 75.72 | 68.65 | 61.12 | 55.65 | 64.62 | a | ||||||||
2013 | 54.52 | 54.86 | 59.84 | 61.48 | 66.08 | 67.42 | 70.58 | 70.53 | 70.63 | 63.13 | 60.97 | 57.44 | 63.12 | |||||||||||||
2014 | 60.10 | 58.02 | 60.77 | 61.77 | 67.82 | 67.85 | 72.55 | 72.89 | 73.97 | 69.73 | 63.73 | 58.61 | 65.65 | |||||||||||||
2015 | 59.02 | 60.71 | 63.85 | 62.17 | 61.95 | 68.75 | 71.52 | 74.23 | 75.02 | 71.66 | 60.00 | 54.21 | 65.26 | |||||||||||||
2016 | 55.05 | 61.97 | 59.03 | 61.67 | 62.52 | 69.37 | 72.71 | 72.44 | 70.63 | 67.32 | 63.52 | 56.74 | 64.41 | |||||||||||||
2017 | 54.85 | 56.09 | 59.92 | 62.10 | 62.76 | 67.48 | 73.06 | 73.10 | 71.30 | 69.89 | 63.22 | 60.11 | 64.49 | |||||||||||||
2018 | 60.37 | 56.09 | 57.05 | 61.47 | 62.00 | 67.00 | 74.97 | 75.23 | 70.25 | 66.84 | 62.73 | 56.05 | 64.17 | |||||||||||||
2019 | 55.87 | 51.02 | 56.92 | 61.38 | 60.76 | 66.70 | 71.42 | 72.26 | 71.58 | 66.39 | 60.62 | 55.02 | 62.49 | |||||||||||||
2020 | 55.56 | 56.21 | 56.02 | 60.35 | 65.53 | 67.85 | 71.16 | 74.47 | 73.43 | 70.10 | 60.18 | 57.11 | 64.00 | |||||||||||||
2021 | 56.60 | 55.93 | 54.81 | 61.08 | 63.06 | 66.90 | 71.52 | 71.95 | 70.48 | 64.13 | 63.48 | 53.66 | 62.80 | |||||||||||||
2022 | 56.85 | 57.50 | 58.81 | 62.15 | 62.95 | 68.77 | 70.87 | 74.44 | 74.92 | 67.53 | 58.03 | 54.71 | 63.96 | |||||||||||||
2023 | 53.06 | 52.12 | 53.29 | 57.75 | 60.81 | 64.37 | 72.08 | 73.06 | 70.32 | 67.19 | 63.47 | 59.44 | 62.25 | |||||||||||||
2024 | 55.19 | r | 55.84 | 56.76 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 56.30 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 55.90 | 56.40 | 57.36 | 59.95 | 63.11 | 66.79 | 71.04 | 72.55 | 71.26 | 66.69 | 60.67 | 55.87 | 63.49 | |||||||||||||
S.D. | 2.39 | 2.62 | 2.47 | 2.83 | 2.44 | 2.24 | 2.18 | 2.20 | 2.51 | 2.31 | 2.13 | 2.27 | 1.40 | |||||||||||||
SKEW | 0.37 | -0.01 | 0.18 | -0.46 | 0.49 | 0.02 | 0.56 | 0.10 | 0.45 | 0.22 | -0.15 | -0.01 | -0.49 | |||||||||||||
MAX | 61.88 | 61.97 | 63.85 | 66.20 | 70.05 | 72.02 | 76.91 | 77.95 | 78.21 | 72.30 | 64.00 | 60.55 | 65.82 | |||||||||||||
MIN | 51.16 | 51.02 | 52.69 | 51.12 | 58.27 | 61.66 | 66.74 | 66.58 | 66.85 | 62.23 | 56.34 | 49.98 | 59.40 | |||||||||||||
YRS | 57 | 58 | 59 | 58 | 56 | 58 | 61 | 59 | 57 | 54 | 58 | 60 | 40 |