YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.26 | b | 58.77 | 61.83 | 57.97 | 53.38 | 53.50 | 57.12 | f | |||||
1940 | 52.23 | 53.16 | 54.00 | 55.50 | 55.82 | 57.80 | 59.52 | 59.58 | 61.97 | 57.23 | 54.90 | 54.17 | a | 56.32 | ||||||||||||
1941 | 52.69 | 54.23 | 56.23 | 53.98 | 59.07 | c | 59.00 | 59.56 | 61.08 | m | 59.47 | 55.02 | 56.82 | 51.97 | 56.19 | a | ||||||||||
1942 | 51.71 | 50.80 | 50.89 | 53.22 | 55.12 | b | 56.41 | a | 59.85 | 58.66 | 58.35 | 55.03 | 52.73 | 50.31 | 54.42 | |||||||||||
1943 | 49.89 | 52.98 | 53.23 | 53.58 | 54.53 | a | 55.80 | 57.90 | 57.76 | b | 60.13 | 56.65 | 56.13 | 51.56 | 55.01 | |||||||||||
1944 | 51.00 | 48.48 | 51.31 | 51.28 | 53.84 | 56.25 | 57.13 | 57.23 | a | 56.08 | 56.92 | a | 53.02 | 53.11 | 53.80 | |||||||||||
1945 | 48.76 | b | 50.24 | a | 48.97 | 51.00 | 54.62 | a | 57.07 | 59.08 | 55.90 | a | 57.98 | a | 56.87 | 53.14 | a | 52.00 | 53.80 | |||||||
1946 | 48.81 | 47.62 | 49.26 | 51.36 | a | 53.65 | 56.65 | 58.26 | 57.06 | 58.58 | 55.10 | 51.53 | 51.06 | 53.25 | ||||||||||||
1947 | 46.45 | 51.83 | a | 53.42 | 54.40 | a | 55.42 | a | 57.64 | a | 59.60 | 61.06 | 59.11 | b | 58.00 | a | 50.86 | a | 49.05 | a | 54.74 | |||||
1948 | 52.21 | 48.09 | 49.03 | 52.45 | 54.11 | 58.27 | 57.56 | 58.58 | 56.57 | 57.71 | 52.60 | 46.32 | 53.63 | |||||||||||||
1949 | 42.95 | 46.55 | 51.87 | 51.52 | 54.95 | 56.64 | b | 56.18 | 58.66 | 57.38 | n | 52.84 | c | ----- | z | ----- | z | 52.46 | c | |||||||
1950 | ----- | z | 49.72 | c | 50.40 | 51.33 | i | 52.13 | 55.33 | 56.50 | 57.61 | d | 58.20 | 57.10 | 59.30 | 54.00 | 55.03 | b | ||||||||
1951 | 49.37 | 50.43 | 49.60 | 50.62 | 54.19 | b | 54.30 | 55.40 | 56.31 | b | 59.28 | 56.10 | 53.76 | a | 49.32 | 53.22 | ||||||||||
1952 | 47.37 | 50.59 | 49.58 | 51.40 | 53.18 | 54.42 | 58.34 | 58.90 | 60.63 | 57.23 | 53.27 | 51.32 | 53.85 | |||||||||||||
1953 | 53.79 | 53.46 | o | ----- | z | 51.35 | f | 54.63 | 56.28 | 55.74 | 58.84 | 61.25 | 56.39 | 52.60 | 49.61 | 55.46 | c | |||||||||
1954 | 47.32 | 52.77 | 48.32 | 52.27 | 53.95 | 55.83 | 56.82 | 56.92 | 57.77 | 56.53 | 54.70 | 50.60 | 53.65 | |||||||||||||
1955 | 46.77 | 48.64 | 50.65 | 49.02 | a | 52.55 | a | 55.22 | 55.21 | 54.98 | 54.90 | 55.06 | 51.45 | a | 51.54 | g | 52.22 | a | ||||||||
1956 | 50.88 | b | 48.20 | a | 51.07 | a | 52.48 | 55.32 | c | 57.45 | b | 58.17 | a | 56.31 | 59.39 | c | 57.06 | 56.36 | a | 51.40 | a | 54.51 | ||||
1957 | 47.57 | b | 52.81 | a | 52.54 | c | 54.52 | 56.89 | c | 58.35 | 58.65 | e | 58.64 | b | 60.65 | c | 59.48 | a | 54.45 | 53.05 | 55.63 | |||||
1958 | 52.50 | d | 54.29 | g | 51.84 | b | 54.95 | 57.78 | a | 61.72 | 59.89 | 60.17 | b | 62.02 | 56.90 | 54.10 | 54.89 | 56.98 | a | |||||||
1959 | 52.42 | a | 51.18 | 54.39 | c | 55.20 | b | 55.95 | 57.70 | 59.45 | c | 60.83 | a | 59.90 | a | 59.65 | a | 55.85 | g | 53.31 | b | 56.36 | a | |||
1960 | 49.71 | 51.69 | 53.73 | 53.95 | 55.34 | 58.55 | b | 57.89 | 57.32 | 57.70 | 56.69 | 54.48 | 53.39 | 55.04 | ||||||||||||
1961 | 54.03 | 52.45 | 51.84 | 53.82 | 55.55 | 59.18 | 59.19 | 61.88 | b | 60.34 | a | 58.29 | 52.38 | a | 49.15 | a | 55.68 | |||||||||
1962 | 50.98 | b | 49.96 | c | 49.87 | 53.16 | a | 53.58 | a | 54.78 | 55.43 | a | 58.33 | a | 57.29 | b | 57.15 | a | 54.13 | 50.98 | a | 53.80 | ||||
1963 | 48.02 | b | 54.54 | 50.02 | 52.17 | a | 54.50 | 55.20 | e | 58.18 | a | 57.58 | 59.64 | i | 59.47 | 55.40 | 51.69 | 54.25 | a | |||||||
1964 | 49.39 | 52.36 | 50.26 | 51.00 | 51.78 | a | 56.00 | 57.84 | b | 59.17 | g | 58.50 | a | 58.13 | a | 52.84 | b | 51.39 | 53.59 | a | ||||||
1965 | 51.39 | 49.32 | 51.56 | 53.43 | 53.73 | 54.78 | a | 55.97 | a | 60.35 | 58.62 | 60.42 | 56.05 | 48.05 | 54.47 | |||||||||||
1966 | 50.32 | 48.98 | 50.35 | 53.90 | a | 51.56 | 55.52 | 55.70 | a | 57.77 | a | 59.80 | b | 59.05 | b | 55.20 | 50.77 | 54.08 | ||||||||
1967 | 51.92 | a | 53.18 | 50.87 | a | 49.37 | 53.19 | 55.13 | 58.64 | b | 58.52 | a | 61.60 | a | 60.33 | a | 57.47 | 50.12 | c | 55.03 | ||||||
1968 | 52.03 | a | 54.43 | b | 53.89 | 52.91 | a | 54.45 | 56.13 | 57.74 | 59.88 | e | 59.22 | 56.13 | 53.25 | 49.58 | 54.97 | |||||||||
1969 | 47.47 | 47.50 | 51.12 | b | 50.10 | 53.33 | a | 55.76 | a | 54.84 | 54.56 | 57.37 | 55.74 | 56.87 | 54.00 | 53.22 | ||||||||||
1970 | 54.10 | 53.14 | 52.77 | a | 51.40 | 54.74 | b | 54.42 | 55.40 | 55.13 | 58.33 | 56.27 | 56.17 | 49.68 | 54.30 | |||||||||||
1971 | 51.08 | 50.79 | 51.00 | 50.33 | 51.68 | 54.02 | 53.65 | 58.31 | 58.87 | 52.79 | 52.41 | a | 46.71 | 52.64 | ||||||||||||
1972 | 47.38 | a | 51.52 | 52.71 | b | 51.77 | 52.50 | 55.09 | a | 57.71 | 60.16 | 60.30 | 60.05 | 54.38 | 48.22 | a | 54.31 | |||||||||
1973 | 49.48 | 53.86 | ----- | z | 53.72 | 54.31 | 57.30 | 57.50 | 57.29 | 59.07 | 57.26 | 52.58 | 51.39 | 54.89 | a | |||||||||||
1974 | 48.87 | 50.02 | 52.34 | 52.45 | 52.89 | 56.25 | 58.84 | 59.68 | 59.35 | 58.32 | 54.22 | 50.06 | 54.44 | |||||||||||||
1975 | 49.95 | c | 50.61 | 50.43 | a | 49.09 | a | 53.02 | a | 54.58 | 56.35 | a | 56.95 | 56.90 | 54.63 | 51.93 | 50.50 | e | 52.91 | |||||||
1976 | 50.90 | 50.33 | b | 49.52 | b | 50.25 | 54.42 | 56.63 | 58.02 | 61.68 | 60.12 | 58.45 | b | 56.53 | 52.65 | 54.96 | ||||||||||
1977 | 51.26 | 52.98 | 50.03 | 50.70 | 53.62 | a | 56.18 | 57.44 | 60.92 | a | 59.60 | e | 56.13 | 52.61 | b | 53.89 | 54.61 | |||||||||
1978 | 54.24 | 53.18 | 56.68 | 54.09 | a | 55.44 | 57.18 | 57.90 | 58.98 | a | 59.89 | b | 56.06 | 50.90 | 47.80 | c | 55.20 | |||||||||
1979 | 49.34 | 49.74 | a | 52.68 | 52.27 | 54.60 | a | 55.38 | a | 58.34 | 59.31 | 61.60 | a | 59.73 | 54.17 | 53.65 | 55.07 | |||||||||
1980 | 51.79 | 55.29 | 52.40 | 53.05 | 54.29 | 57.08 | 59.52 | 58.47 | 58.35 | 55.98 | a | 54.08 | d | 54.48 | 55.40 | |||||||||||
1981 | 53.37 | 53.86 | 53.13 | 52.93 | 54.32 | 57.66 | a | 57.08 | 58.76 | 58.40 | 55.39 | 56.98 | 52.95 | a | 55.40 | |||||||||||
1982 | 48.86 | b | 52.21 | 51.87 | a | 52.71 | a | 54.45 | 58.48 | a | 58.48 | a | 58.94 | 59.23 | 58.17 | a | 54.67 | c | 52.32 | 55.03 | ||||||
1983 | 52.90 | b | 53.83 | b | 54.05 | a | 53.97 | 55.38 | c | 57.94 | d | 59.93 | b | 62.97 | a | 64.13 | d | 61.21 | 54.43 | c | 52.57 | h | 57.34 | a | ||
1984 | 52.30 | a | 51.50 | c | 52.91 | c | 51.82 | 54.14 | c | 55.32 | 59.95 | a | 59.93 | a | 61.09 | a | 55.59 | c | 53.03 | a | 49.84 | 54.78 | ||||
1985 | 49.76 | b | 51.29 | b | 49.61 | 53.11 | b | 55.04 | c | 57.76 | a | 58.71 | b | 59.73 | 59.35 | 56.70 | a | ----- | z | 51.47 | b | 54.77 | a | |||
1986 | 54.56 | 54.81 | a | 55.32 | 52.20 | 52.98 | a | 58.98 | c | 59.37 | a | 59.72 | a | 58.85 | 57.17 | b | 54.80 | 51.57 | a | 55.86 | ||||||
1987 | 49.61 | c | 53.50 | c | 52.16 | 53.92 | d | 56.29 | c | 56.57 | o | ----- | z | 60.30 | d | 58.81 | a | 58.59 | b | 55.40 | 50.11 | c | 54.87 | b | ||
1988 | 50.94 | 52.83 | 50.76 | b | 53.40 | a | 53.25 | m | 56.52 | 58.25 | s | ----- | z | 56.97 | 56.52 | c | 53.31 | a | 50.29 | c | 53.50 | c | ||||
1989 | 47.67 | d | 46.11 | a | 52.18 | 55.02 | b | 54.68 | 57.40 | a | 57.63 | e | 58.93 | b | 58.91 | b | 56.98 | f | 57.74 | a | 53.74 | 54.55 | a | |||
1990 | 51.55 | b | 48.30 | c | 51.27 | 54.25 | 54.15 | 55.92 | f | 58.79 | b | 60.86 | c | 59.90 | a | 54.73 | a | 52.07 | 45.53 | 53.76 | a | |||||
1991 | 48.23 | 50.45 | 47.68 | 49.62 | b | 49.68 | 52.60 | 56.27 | a | 58.95 | a | 57.85 | 56.48 | a | 53.50 | 51.37 | d | 52.72 | ||||||||
1992 | 51.50 | a | 55.41 | 55.78 | a | 56.59 | a | 57.94 | 59.05 | 61.40 | 57.52 | a | 58.55 | b | 59.31 | 54.20 | b | 50.02 | c | 56.44 | ||||||
1993 | 49.28 | b | 51.65 | a | 54.19 | 51.10 | 54.90 | a | 55.33 | d | 56.18 | f | 60.17 | h | 54.10 | d | 57.71 | e | 54.38 | i | 50.80 | h | 53.53 | d | ||
1994 | 51.66 | l | 50.24 | g | 52.84 | i | 53.21 | i | 54.68 | i | 55.34 | b | 57.20 | a | 58.37 | a | 60.06 | e | 56.69 | b | 49.89 | b | 48.39 | c | 55.13 | e |
1995 | 53.33 | b | 54.76 | a | 53.62 | a | 53.12 | a | 54.84 | 55.66 | a | 60.68 | 59.05 | 59.45 | b | 58.43 | c | 54.61 | c | 52.90 | 55.87 | |||||
1996 | 52.55 | a | 53.95 | a | 53.59 | c | 54.12 | b | 54.79 | c | 54.62 | 57.50 | a | 57.86 | b | 57.24 | a | 56.00 | c | 54.26 | a | 54.05 | a | 55.04 | ||
1997 | 52.02 | b | 51.43 | a | 51.28 | b | 52.95 | a | 57.90 | b | 57.38 | b | 59.43 | b | 62.63 | a | 62.97 | 59.00 | c | 57.84 | b | 53.12 | a | 56.49 | ||
1998 | 53.26 | 51.94 | b | 53.19 | b | 52.55 | 55.56 | 58.04 | d | 57.52 | 58.36 | b | 58.95 | b | 55.45 | a | 52.30 | 49.17 | d | 54.69 | ||||||
1999 | 51.00 | a | 48.91 | 48.89 | 51.24 | a | 51.05 | 54.48 | a | 56.90 | b | 59.27 | 58.63 | d | 56.73 | c | 54.26 | a | 51.22 | a | 53.55 | |||||
2000 | 51.50 | a | 52.68 | a | 51.68 | 53.93 | a | 55.23 | 57.93 | 58.18 | 58.80 | a | 60.63 | 56.78 | a | 52.18 | 54.21 | 55.31 | ||||||||
2001 | 50.26 | 51.16 | 52.70 | a | 50.45 | 56.00 | w | 56.34 | n | 58.17 | a | 58.70 | a | 57.88 | 58.15 | a | ----- | z | ----- | z | 54.68 | d | ||||
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.96 | c | 59.16 | f | 56.41 | h | 54.38 | j | 53.12 | m | 52.12 | o | 57.96 | k |
2003 | 56.71 | j | 51.71 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.52 | e | 56.91 | b | 53.19 | c | 52.32 | a | 55.73 | h |
2004 | 50.76 | 49.84 | a | 54.29 | b | 53.98 | b | 56.44 | 57.10 | 61.08 | 61.93 | c | 57.47 | 56.26 | 53.72 | 51.82 | a | 55.39 | ||||||||
2005 | 50.66 | 53.64 | 54.72 | a | 52.93 | 57.63 | 57.08 | 59.35 | 58.28 | a | 57.32 | 54.15 | a | 55.59 | a | 53.20 | a | 55.38 | ||||||||
2006 | 50.88 | a | 50.89 | a | 48.86 | b | 54.10 | a | 55.48 | 58.68 | 59.05 | a | 59.75 | a | 56.22 | 56.84 | 53.10 | 50.71 | 54.55 | |||||||
2007 | 46.24 | b | 51.12 | 50.35 | 51.16 | a | 54.52 | a | 56.08 | 60.08 | 60.05 | 58.47 | 55.29 | 53.03 | a | 47.69 | 53.67 | |||||||||
2008 | 48.31 | 49.11 | a | 49.33 | a | 49.87 | 53.17 | a | 54.73 | 58.68 | 59.42 | a | 57.07 | 56.11 | 55.68 | 48.69 | 53.35 | |||||||||
2009 | 53.74 | 51.02 | 50.74 | 51.66 | a | 54.00 | 58.93 | c | 59.02 | a | 60.48 | a | 58.70 | 56.83 | a | 52.17 | 49.21 | 54.71 | ||||||||
2010 | 52.69 | 52.62 | 51.77 | 52.22 | 53.21 | 57.17 | 58.63 | 58.69 | 57.90 | 56.26 | 52.29 | a | 51.87 | 54.61 | ||||||||||||
2011 | 52.07 | a | 49.28 | a | 52.10 | 52.83 | 54.79 | 56.63 | 58.47 | 58.34 | 58.14 | a | 59.00 | 51.65 | 48.10 | 54.28 | ||||||||||
2012 | 51.08 | 49.88 | 50.38 | a | 53.58 | 53.79 | 55.91 | a | 58.44 | 57.94 | 56.02 | 57.90 | a | 56.58 | 50.79 | 54.36 | ||||||||||
2013 | 50.77 | 48.15 | a | 50.77 | 52.59 | b | 55.90 | a | 57.60 | 59.63 | 61.79 | 60.23 | 55.33 | b | 52.55 | 50.02 | 54.61 | |||||||||
2014 | 52.77 | 51.38 | 54.65 | 53.95 | a | 57.22 | b | 57.14 | a | 62.31 | 63.23 | a | 63.18 | 60.40 | a | 56.47 | 55.37 | a | 57.34 | |||||||
2015 | 55.00 | 55.96 | 54.68 | 53.21 | a | 56.66 | 59.21 | a | 63.58 | 64.83 | a | 59.92 | 59.50 | 51.40 | 49.63 | a | 56.97 | |||||||||
2016 | 53.18 | a | 54.59 | a | 54.44 | 55.98 | b | 57.23 | 57.57 | a | 57.35 | 59.60 | 58.36 | b | 58.02 | 55.17 | a | 49.45 | 55.91 | |||||||
2017 | 50.10 | 52.65 | a | 53.37 | a | 54.32 | 54.66 | 58.27 | 57.87 | 60.62 | a | 62.78 | 57.13 | 55.05 | 52.27 | 55.76 | ||||||||||
2018 | 53.32 | 49.89 | 51.77 | 53.05 | 55.61 | 56.40 | 59.61 | 59.29 | 57.17 | 57.40 | 53.23 | 51.85 | 54.88 | |||||||||||||
2019 | 53.13 | 48.67 | a | 52.23 | 54.93 | 55.74 | 59.42 | 59.12 | b | 61.50 | 60.96 | b | 56.06 | 51.05 | 52.63 | 55.45 | ||||||||||
2020 | 50.23 | 50.53 | 51.79 | 54.10 | 56.37 | 58.15 | 59.18 | 60.74 | 60.78 | 57.78 | a | 51.05 | 50.44 | 55.10 | ||||||||||||
2021 | 51.05 | a | 49.86 | 49.37 | a | 51.88 | 52.65 | 58.05 | 58.67 | a | 60.29 | 58.40 | a | 56.39 | 56.97 | 50.44 | 54.50 | |||||||||
2022 | 51.38 | a | 50.07 | 49.61 | 51.34 | a | 52.81 | 56.38 | 57.85 | a | 60.18 | 59.88 | 56.27 | 49.53 | a | 49.77 | 53.76 | |||||||||
2023 | 51.42 | a | 46.77 | 48.48 | 50.33 | 54.66 | 56.32 | 56.73 | a | 60.16 | 59.85 | 58.11 | 55.67 | a | 53.48 | a | 54.33 | |||||||||
2024 | 52.18 | 52.22 | 52.90 | 51.27 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.43 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 50.79 | 51.29 | 51.79 | 52.64 | 54.58 | 56.72 | 58.20 | 59.15 | 59.12 | 57.12 | 53.97 | 51.15 | 54.70 | |||||||||||||
S.D. | 2.23 | 2.25 | 1.99 | 1.66 | 1.67 | 1.58 | 1.66 | 1.85 | 1.82 | 1.66 | 1.98 | 2.10 | 1.00 | |||||||||||||
SKEW | -0.67 | -0.11 | 0.23 | -0.16 | 0.01 | 0.19 | 0.13 | 0.19 | 0.13 | 0.08 | 0.23 | -0.27 | 0.20 | |||||||||||||
MAX | 55.00 | 55.96 | 56.68 | 56.59 | 59.07 | 61.72 | 63.58 | 64.83 | 64.13 | 61.21 | 59.30 | 55.37 | 57.34 | |||||||||||||
MIN | 42.95 | 46.11 | 47.68 | 49.02 | 49.68 | 52.60 | 53.65 | 54.56 | 54.10 | 52.79 | 49.53 | 45.53 | 52.64 | |||||||||||||
YRS | 81 | 80 | 80 | 79 | 79 | 79 | 81 | 79 | 82 | 83 | 79 | 79 | 63 |