YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.40 | a | 66.77 | 65.35 | m | ----- | z | ----- | z | ----- | z | 66.09 | j | |
1949 | 48.71 | 48.75 | 55.16 | 57.90 | 60.71 | 64.10 | 64.90 | 66.71 | 65.55 | a | 61.55 | 62.97 | 52.39 | 59.12 | ||||||||||||
1950 | 46.57 | a | 54.64 | 53.83 | a | 57.03 | 59.48 | 62.82 | b | 68.28 | b | 67.42 | 64.87 | 61.77 | a | 60.80 | 57.65 | 59.60 | ||||||||
1951 | 52.16 | 54.00 | 52.55 | 55.14 | b | 60.10 | 63.83 | 64.90 | 67.60 | a | 62.33 | 63.65 | 60.93 | 51.74 | 59.08 | |||||||||||
1952 | 49.26 | 53.69 | 52.32 | 57.07 | 60.35 | 61.43 | 66.23 | 64.55 | 64.83 | 60.26 | 57.13 | 51.94 | 58.25 | |||||||||||||
1953 | 54.94 | 54.04 | 52.94 | 56.07 | 60.90 | 61.07 | 66.39 | 66.72 | b | 67.67 | 63.65 | 58.73 | 54.61 | 59.81 | ||||||||||||
1954 | 51.55 | 54.93 | 55.16 | 57.45 | a | 59.26 | 61.47 | 64.81 | 65.84 | 66.41 | a | 64.32 | 58.97 | 55.23 | a | 59.62 | ||||||||||
1955 | 51.77 | 51.43 | 53.19 | 52.83 | 58.23 | 62.66 | a | 63.81 | 63.13 | h | 66.00 | c | 60.45 | i | 55.83 | a | 53.97 | a | 56.97 | b | ||||||
1956 | 53.39 | 50.66 | 53.52 | 56.64 | b | 59.96 | e | 63.04 | c | 66.27 | a | 67.68 | 65.07 | c | 60.90 | 56.46 | b | 53.69 | b | 58.94 | ||||||
1957 | 49.32 | 54.23 | b | 54.89 | c | 59.15 | c | 62.07 | b | 66.81 | c | 67.37 | a | 68.13 | a | 69.67 | 64.68 | c | 58.15 | c | 55.44 | d | 60.83 | |||
1958 | 57.14 | c | 59.36 | f | 55.52 | 59.80 | 62.97 | 67.28 | a | 69.32 | 71.06 | 70.61 | b | 63.37 | a | 58.11 | c | 58.92 | f | 63.52 | b | |||||
1959 | 54.87 | 54.64 | 56.81 | 60.11 | b | 60.50 | a | 64.63 | c | 66.03 | b | 67.87 | a | 64.57 | b | 63.50 | e | 59.04 | e | 55.23 | i | 61.14 | a | |||
1960 | 53.58 | 54.79 | 55.31 | b | 57.28 | a | 58.71 | 66.78 | c | 64.70 | a | 66.50 | c | 63.69 | d | 62.16 | f | 57.29 | b | 55.72 | b | 59.49 | a | |||
1961 | 56.84 | 55.32 | c | 55.23 | a | 56.63 | 58.29 | c | 65.87 | g | 66.00 | a | 67.50 | c | 65.65 | d | 61.19 | e | 54.87 | 51.81 | 59.03 | a | ||||
1962 | 53.60 | a | 53.14 | 53.07 | a | 57.82 | b | 58.90 | 62.48 | a | 66.10 | 66.83 | b | 65.90 | 63.44 | d | 57.43 | b | 57.43 | h | 59.88 | a | ||||
1963 | 53.00 | d | 60.36 | 55.18 | c | 55.30 | 59.90 | 64.50 | 66.52 | 66.52 | 67.30 | c | 63.52 | 57.10 | a | 56.67 | a | 60.49 | ||||||||
1964 | 53.23 | 59.48 | 53.87 | 56.97 | 59.32 | 63.97 | 67.65 | 67.45 | 67.73 | 62.94 | 57.30 | 53.48 | 60.28 | |||||||||||||
1965 | 52.97 | 55.29 | 58.61 | 58.79 | b | 60.74 | 64.47 | 67.10 | a | 69.32 | 67.13 | 65.08 | e | 60.14 | a | 53.75 | c | 61.12 | ||||||||
1966 | 53.55 | 54.36 | 54.81 | 60.53 | 62.19 | 67.86 | a | 68.61 | 70.67 | a | 70.75 | b | 63.83 | b | 59.17 | a | 56.11 | d | 61.87 | |||||||
1967 | 54.21 | g | 56.57 | g | 55.00 | h | 55.90 | j | 61.91 | i | 67.32 | e | 69.93 | a | 69.42 | 70.64 | b | 65.83 | g | 61.60 | 54.16 | 65.51 | f | |||
1968 | 55.39 | 59.18 | a | 58.39 | 58.67 | 61.77 | a | 67.37 | c | 68.10 | 68.83 | a | 70.04 | f | 63.67 | g | 59.95 | j | 53.78 | m | 62.21 | d | ||||
1969 | 48.67 | d | 51.65 | b | 58.74 | 57.72 | a | 62.67 | a | 65.87 | 69.06 | 70.55 | 68.88 | d | 65.14 | i | 61.92 | f | 57.26 | 61.11 | b | |||||
1970 | 56.94 | 59.64 | 58.39 | 57.60 | 64.07 | b | 64.67 | c | 68.39 | 67.23 | 69.60 | 62.32 | 60.67 | l | 54.65 | 62.13 | a | |||||||||
1971 | 52.83 | a | 54.14 | 53.84 | 55.53 | 58.94 | 61.60 | 66.10 | a | 70.55 | 69.83 | 62.54 | c | 57.36 | b | 50.87 | 59.51 | |||||||||
1972 | 51.50 | a | 53.34 | 56.14 | b | 56.82 | b | 61.19 | 66.13 | 68.73 | a | 69.26 | 65.38 | f | 67.07 | a | 58.04 | e | 50.30 | h | 60.82 | b | ||||
1973 | 53.72 | b | 59.38 | d | 54.48 | 60.03 | 62.42 | 65.67 | 68.78 | h | 67.44 | d | 67.52 | c | 63.23 | 54.86 | a | 55.84 | f | 60.88 | b | |||||
1974 | 54.32 | 54.10 | g | 55.90 | k | 58.59 | h | 60.91 | i | 62.96 | d | 67.00 | a | 68.11 | c | 68.64 | e | 66.42 | e | 56.39 | g | 55.12 | g | 64.58 | f | |
1975 | 54.92 | f | 56.48 | g | 54.65 | e | 55.00 | g | 62.22 | d | 65.95 | j | 67.91 | h | 68.24 | n | 66.54 | d | 64.23 | a | 57.48 | c | 56.48 | f | 61.03 | g |
1976 | 55.06 | m | 52.74 | j | 54.20 | k | 56.36 | h | 62.19 | d | 65.00 | g | 68.67 | d | 68.52 | 68.93 | 65.76 | b | 62.00 | k | 58.79 | l | 66.81 | g | ||
1977 | 58.62 | j | 57.69 | b | 54.11 | c | 57.00 | a | 59.50 | a | 67.12 | d | 67.32 | 65.13 | 65.87 | 62.17 | a | 56.61 | b | 55.97 | 60.77 | a | ||||
1978 | 57.30 | d | 55.64 | f | 59.46 | c | 57.47 | 61.73 | e | 64.50 | b | 66.93 | a | 68.70 | a | 68.20 | 67.17 | g | 56.56 | e | 53.03 | b | 61.39 | b | ||
1979 | 53.97 | a | 52.96 | 56.67 | a | 57.97 | 62.86 | b | 64.69 | a | 70.04 | d | 69.22 | d | 71.34 | a | 65.97 | 62.28 | e | 60.07 | c | 62.34 | ||||
1980 | 56.11 | c | 59.33 | b | 57.19 | 61.53 | 61.71 | c | 62.38 | d | 69.66 | b | 69.15 | d | 67.03 | a | 64.71 | c | 58.07 | c | 56.00 | b | 61.91 | |||
1981 | 58.03 | a | 57.44 | a | 56.13 | a | 58.50 | 61.81 | 66.50 | 67.80 | a | 67.70 | a | 68.03 | 63.58 | 59.43 | 55.84 | 61.73 | ||||||||
1982 | 52.81 | 54.39 | 54.48 | 57.54 | b | 62.07 | b | 63.48 | c | 64.74 | d | 67.03 | 68.97 | a | 64.52 | 57.00 | b | 53.37 | a | 60.03 | ||||||
1983 | 56.63 | a | 56.29 | 55.84 | 57.61 | b | 59.75 | c | 64.52 | c | 67.28 | f | 67.62 | e | 68.50 | b | 63.03 | a | 55.82 | b | 52.07 | d | 59.79 | a | ||
1984 | 56.89 | c | 54.58 | e | 57.48 | b | 57.07 | a | 60.50 | a | 63.04 | c | 68.85 | e | 71.27 | a | 68.75 | b | 60.13 | a | 55.90 | a | 54.50 | c | 60.75 | |
1985 | 57.29 | c | 55.50 | 54.81 | 58.83 | 61.26 | 66.79 | a | 68.33 | a | 66.20 | a | 65.69 | a | 63.07 | a | 53.12 | e | 55.07 | d | 60.50 | |||||
1986 | 57.53 | a | 55.93 | a | 59.47 | a | 57.43 | 60.93 | a | 65.52 | a | 67.97 | a | 66.72 | b | 62.78 | c | 62.13 | a | 59.37 | 56.00 | b | 60.98 | |||
1987 | 54.62 | b | 56.33 | a | 58.03 | a | 59.90 | 63.40 | a | 66.20 | 65.77 | 69.36 | c | 65.23 | 66.14 | b | 60.70 | 54.25 | c | 61.66 | ||||||
1988 | 54.90 | 56.93 | a | 57.21 | b | 59.24 | a | 61.29 | 65.30 | 71.06 | 67.61 | c | 68.03 | 64.00 | 57.31 | a | 56.20 | a | 61.59 | |||||||
1989 | 52.93 | a | 50.96 | 54.65 | 61.34 | a | 61.58 | 66.00 | c | 66.46 | c | 69.07 | c | 63.57 | b | 63.03 | a | 59.24 | a | 56.16 | 60.42 | |||||
1990 | 53.77 | a | 51.21 | d | 56.34 | b | 58.10 | 60.43 | a | 65.37 | 68.81 | d | 68.48 | 68.29 | b | 64.80 | a | 58.19 | c | 49.86 | j | 61.25 | a | |||
1991 | 54.80 | a | 60.22 | a | ----- | z | 57.75 | b | 58.19 | e | 63.12 | d | 68.84 | 66.25 | g | 71.37 | c | 67.81 | e | 57.77 | h | 54.52 | j | 62.76 | d | |
1992 | 56.76 | j | 60.63 | j | 60.14 | i | 61.73 | h | 64.58 | l | 65.45 | h | 68.95 | i | 69.50 | k | 67.84 | k | 65.20 | k | 58.33 | l | 53.11 | l | ----- | z |
1993 | 52.79 | l | 55.76 | k | 57.59 | i | 58.09 | g | 61.88 | n | 66.95 | h | 67.25 | k | 68.45 | i | 64.37 | k | 69.12 | o | 59.10 | j | 56.50 | k | ----- | z |
1994 | 57.21 | l | 53.78 | j | 58.39 | h | 58.00 | l | 61.80 | k | 64.71 | i | 68.94 | m | 70.22 | h | 68.83 | l | 61.74 | l | 52.64 | h | 52.00 | m | ----- | z |
1995 | 55.20 | k | 56.47 | i | 57.33 | j | 57.39 | l | 60.18 | i | 62.20 | e | 67.19 | e | 69.38 | b | 66.32 | h | 63.38 | j | 57.78 | g | 57.00 | p | 66.26 | i |
1996 | 53.85 | e | 56.30 | f | 59.04 | d | 59.62 | a | 60.17 | g | 65.28 | e | 68.00 | c | 67.10 | 71.89 | u | 63.69 | e | 57.63 | k | 55.12 | f | 62.37 | e | |
1997 | 56.40 | f | 56.84 | i | 57.73 | i | 58.90 | i | 66.85 | e | 67.08 | e | 71.71 | 70.67 | d | 70.12 | e | 63.27 | e | 59.08 | e | 58.28 | m | 66.97 | e | |
1998 | 56.24 | f | 55.19 | a | 58.39 | c | 59.27 | d | 61.92 | e | 65.07 | a | 68.03 | b | 70.66 | b | 70.83 | f | 65.52 | j | 55.58 | d | 52.03 | b | 60.68 | c |
1999 | 53.50 | c | 52.89 | a | 55.10 | 59.07 | b | 60.52 | 64.33 | 64.04 | c | 67.03 | b | 69.63 | 63.70 | a | 59.32 | b | 52.89 | c | 60.17 | |||||
2000 | 53.35 | 56.43 | a | 57.19 | d | 62.15 | d | 62.27 | a | 68.73 | 66.83 | b | 68.36 | c | 70.86 | b | 62.93 | a | 56.00 | a | 54.74 | 61.65 | ||||
2001 | 56.39 | c | 55.64 | 59.73 | a | 58.27 | 67.18 | c | 65.33 | 68.93 | b | 67.00 | 68.64 | b | 64.87 | 58.21 | a | 54.31 | b | 62.04 | ||||||
2002 | 53.35 | 56.85 | a | 56.61 | 59.60 | 63.52 | 64.97 | 70.50 | a | 70.48 | 70.82 | b | 63.35 | 61.62 | a | 55.77 | 62.29 | |||||||||
2003 | 58.04 | c | 57.14 | 57.90 | 57.57 | 63.61 | 70.25 | b | 68.10 | b | 67.65 | 69.34 | a | 67.60 | a | 56.14 | a | 54.50 | s | 63.03 | a | |||||
2004 | 53.76 | b | 56.31 | 60.35 | 63.55 | a | 67.21 | g | 68.87 | 74.33 | a | 72.80 | a | 69.90 | 63.63 | a | 57.70 | c | 55.72 | b | 63.36 | a | ||||
2005 | 55.26 | 59.36 | 60.37 | a | 59.93 | 65.32 | c | 67.45 | a | 73.68 | 71.61 | 70.15 | d | 64.36 | c | 56.78 | c | 54.20 | a | 63.21 | ||||||
2006 | 55.86 | x | 59.75 | l | 53.61 | 57.43 | 63.32 | c | 64.93 | a | 67.70 | d | 66.67 | d | 66.40 | e | 64.10 | 56.81 | c | 55.07 | a | 61.60 | b | |||
2007 | 52.14 | b | 53.12 | b | 58.72 | b | 58.67 | c | 61.97 | b | 63.82 | b | 69.86 | b | 72.57 | h | 68.15 | d | 61.32 | f | 57.96 | d | 51.30 | a | 59.57 | b |
2008 | 52.50 | g | 52.57 | a | 54.14 | b | 56.54 | b | 61.41 | d | 64.04 | e | 68.39 | c | 68.69 | b | 67.30 | 63.90 | a | 58.80 | 51.32 | 60.65 | a | |||
2009 | 57.47 | a | 54.36 | 54.48 | 56.97 | 61.61 | 65.17 | 65.71 | 68.41 | d | 68.57 | 63.23 | 57.90 | 53.23 | 60.59 | |||||||||||
2010 | 56.35 | 56.04 | 56.39 | 55.93 | 58.16 | 62.77 | 66.79 | g | 66.61 | 67.47 | 65.45 | 55.03 | 55.29 | 59.59 | a | |||||||||||
2011 | 56.97 | 56.77 | b | 54.13 | 56.27 | 58.26 | 63.70 | 67.71 | 70.06 | 69.23 | 66.32 | 55.73 | 55.68 | 60.90 | ||||||||||||
2012 | 53.65 | 55.34 | 52.74 | 58.27 | 60.97 | 63.10 | 66.29 | 68.19 | 65.93 | 62.45 | 59.40 | 52.32 | 59.89 | |||||||||||||
2013 | 52.97 | 54.04 | 55.90 | 59.20 | 62.84 | 67.30 | 70.83 | a | 68.94 | 67.53 | 60.79 | q | 59.87 | 52.90 | 61.12 | a | ||||||||||
2014 | 58.84 | 55.82 | 59.39 | 60.07 | 65.87 | 67.27 | 69.74 | 71.42 | 69.83 | 66.71 | 61.47 | 58.68 | 63.76 | |||||||||||||
2015 | 58.48 | 61.46 | 60.68 | 60.40 | 62.58 | 67.37 | 72.03 | a | 70.42 | 68.77 | 66.61 | 56.27 | 54.16 | 63.27 | ||||||||||||
2016 | 55.42 | 59.38 | 59.35 | 62.40 | 64.32 | 67.57 | 69.16 | 69.23 | 70.07 | 61.81 | 59.90 | 52.16 | 62.56 | |||||||||||||
2017 | 52.61 | 55.07 | 56.53 | a | 57.60 | ----- | z | 67.15 | d | 73.65 | ----- | z | ----- | z | 63.93 | p | 57.38 | a | 55.10 | a | 59.39 | d | ||||
2018 | 55.35 | 55.04 | 55.29 | 59.50 | 63.39 | 67.30 | 69.29 | 67.39 | 68.67 | 63.27 | a | 60.40 | 54.19 | 61.59 | ||||||||||||
2019 | 56.42 | 49.71 | 55.48 | 60.17 | a | 62.10 | 69.00 | b | 71.58 | 72.13 | a | 69.52 | e | 65.50 | c | 56.75 | b | 56.57 | h | 62.58 | a | |||||
2020 | 53.75 | c | 55.92 | e | 56.53 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 73.00 | j | 65.70 | k | 58.23 | q | 57.33 | s | 54.83 | j |
2021 | 55.31 | r | 53.06 | j | 55.90 | j | 59.23 | h | 61.95 | l | 65.31 | n | 69.12 | n | 68.84 | l | 72.85 | q | ----- | z | ----- | z | ----- | z | ----- | z |
2022 | 56.44 | o | 58.53 | m | 57.55 | i | 57.19 | i | 60.79 | l | 67.90 | i | 66.88 | o | 69.78 | h | 68.57 | i | 62.60 | k | 54.75 | j | 51.85 | k | ----- | z |
2023 | 57.10 | k | 52.17 | j | 50.96 | h | 56.10 | j | 59.87 | a | 63.53 | 68.10 | j | 72.09 | h | 68.14 | i | 61.48 | j | 61.16 | k | 56.59 | n | 61.70 | j | |
2024 | 56.19 | j | 55.30 | i | 55.85 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 54.26 | 55.34 | 56.13 | 58.30 | 61.47 | 65.13 | 68.03 | 68.42 | 67.82 | 63.88 | 58.06 | 54.44 | 60.92 | |||||||||||||
S.D. | 2.58 | 2.75 | 2.22 | 1.89 | 2.02 | 2.08 | 2.30 | 1.75 | 2.19 | 1.73 | 2.02 | 1.94 | 1.32 | |||||||||||||
SKEW | -0.58 | 0.04 | 0.32 | 0.21 | 0.57 | 0.12 | 0.59 | 0.37 | -0.51 | 0.20 | 0.25 | 0.36 | 0.15 | |||||||||||||
MAX | 58.84 | 61.46 | 60.68 | 63.55 | 67.18 | 70.25 | 74.33 | 72.80 | 71.37 | 67.81 | 62.97 | 60.07 | 63.76 | |||||||||||||
MIN | 46.57 | 48.75 | 52.32 | 52.83 | 58.16 | 61.07 | 63.81 | 64.55 | 62.33 | 60.13 | 53.12 | 50.87 | 58.25 | |||||||||||||
YRS | 60 | 59 | 62 | 62 | 63 | 66 | 65 | 64 | 62 | 57 | 60 | 52 | 35 |