YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1930 | 42.00 | p | 53.38 | d | 54.84 | 57.28 | a | 56.90 | 63.17 | 64.48 | 69.61 | c | 65.73 | 63.29 | 59.30 | 54.13 | a | 60.19 | a | |||||||
1931 | 55.61 | 58.44 | c | 60.14 | b | 62.47 | 64.24 | b | 66.90 | 69.24 | b | 66.97 | b | 68.67 | 63.17 | a | 56.64 | b | 51.29 | 61.98 | ||||||
1932 | 50.23 | 51.41 | 56.13 | 58.00 | 58.68 | 67.64 | e | 66.19 | 67.45 | 70.43 | 64.17 | b | 58.48 | e | 51.13 | a | 60.00 | |||||||||
1933 | 50.35 | 52.64 | 54.16 | 59.96 | b | 57.83 | a | 67.63 | 67.68 | 69.61 | c | 64.41 | a | ----- | z | ----- | z | 53.97 | 59.83 | b | ||||||
1934 | 53.53 | a | 60.82 | 60.68 | 61.03 | 64.17 | a | 64.20 | 65.84 | 66.23 | 64.21 | b | 62.97 | 56.50 | 53.10 | 61.11 | ||||||||||
1935 | 49.39 | 56.29 | 50.17 | a | 57.47 | 58.52 | 65.41 | a | 65.71 | 67.13 | a | 67.77 | 59.10 | 52.27 | 53.52 | 58.56 | ||||||||||
1936 | 52.10 | 48.07 | 50.87 | 57.63 | 62.52 | 66.37 | 68.97 | 69.80 | a | 68.07 | 66.47 | a | 58.13 | 50.65 | 59.97 | |||||||||||
1937 | 40.63 | a | 48.64 | 55.10 | 53.40 | 59.26 | 63.97 | a | 65.45 | 66.97 | 66.52 | a | 66.94 | 56.33 | 52.55 | 57.98 | ||||||||||
1938 | 52.13 | 52.11 | 53.00 | a | 58.17 | 59.06 | 61.27 | 64.52 | 64.97 | 66.93 | 63.58 | 55.23 | 51.84 | 58.57 | ||||||||||||
1939 | 49.23 | 46.68 | 51.70 | a | 57.67 | 61.68 | 60.83 | 64.84 | 68.11 | d | 67.30 | 61.87 | 58.87 | 55.29 | 58.67 | |||||||||||
1940 | 54.87 | a | 54.00 | 56.17 | a | 60.00 | 64.13 | 65.41 | a | 67.90 | 69.00 | a | 68.80 | 64.68 | 54.90 | 54.42 | 61.19 | |||||||||
1941 | 55.10 | 58.29 | 62.36 | c | 60.73 | 62.72 | b | 66.48 | a | 70.29 | 66.03 | 66.17 | 62.80 | a | 58.97 | 51.81 | 61.81 | |||||||||
1942 | 52.97 | 52.57 | 54.65 | 57.83 | 61.35 | 63.28 | a | 70.48 | b | 69.69 | b | 69.03 | a | 65.48 | 55.90 | 53.10 | 60.53 | |||||||||
1943 | 49.19 | 58.43 | 54.97 | 58.90 | 58.87 | 63.27 | 65.39 | 67.84 | 69.07 | a | 63.55 | 59.13 | 54.19 | 60.23 | ||||||||||||
1944 | 54.65 | 53.03 | 54.42 | 57.93 | 61.17 | b | 64.23 | 66.77 | 68.17 | a | 68.27 | 67.23 | 56.63 | 54.61 | 60.59 | |||||||||||
1945 | 53.90 | 52.36 | 51.97 | 54.30 | 60.74 | 63.93 | 67.19 | 65.42 | 66.03 | 61.77 | 52.53 | 51.81 | 58.50 | |||||||||||||
1946 | 51.19 | 51.11 | 52.29 | 54.53 | 62.42 | 63.10 | 68.33 | a | 66.67 | a | 68.63 | 59.19 | 55.50 | 52.52 | 58.79 | |||||||||||
1947 | 48.81 | 56.82 | 58.68 | 60.64 | b | 63.33 | a | 65.83 | 69.77 | 69.23 | 69.45 | a | 62.65 | 55.83 | 56.00 | 61.42 | ||||||||||
1948 | 55.52 | 49.62 | 54.52 | 54.07 | 61.87 | 67.87 | 67.97 | 68.77 | 69.86 | a | 64.87 | 53.13 | 47.87 | 59.66 | ||||||||||||
1949 | 44.93 | b | 49.07 | 55.70 | a | 58.77 | 62.93 | b | 63.27 | 66.16 | 69.65 | 70.38 | a | 60.87 | 61.60 | 50.74 | 59.51 | |||||||||
1950 | 41.81 | 50.79 | 52.16 | 56.03 | a | 58.48 | 66.83 | 66.33 | a | 69.45 | 67.67 | 60.60 | a | 55.63 | 55.97 | 58.48 | ||||||||||
1951 | 50.23 | 52.30 | a | 51.87 | 59.13 | 61.48 | 64.53 | 67.10 | a | 67.87 | 68.63 | 62.55 | b | 58.90 | 49.32 | 59.49 | ||||||||||
1952 | 47.10 | 50.52 | 50.71 | 57.33 | 61.77 | 61.53 | 66.94 | 66.53 | a | 68.38 | a | 67.35 | 57.43 | 51.55 | 58.93 | |||||||||||
1953 | 52.52 | 51.43 | 53.90 | 55.73 | 60.69 | b | 61.60 | 66.42 | 67.65 | 69.73 | 64.00 | b | 57.27 | 53.52 | 59.54 | |||||||||||
1954 | 47.13 | 54.15 | a | 52.87 | 54.38 | a | 60.67 | a | 61.37 | 64.00 | 65.60 | a | 66.66 | a | 64.55 | 58.97 | 52.45 | 58.57 | ||||||||
1955 | 49.77 | 50.00 | 48.62 | b | 52.73 | 57.77 | a | 61.83 | a | 63.97 | a | 66.87 | a | 66.29 | b | 61.63 | d | 50.38 | a | 49.97 | 56.65 | |||||
1956 | 50.00 | a | 46.55 | 51.03 | 57.87 | 62.13 | 62.97 | 67.27 | a | 67.77 | 68.17 | 60.32 | 56.90 | a | 50.97 | a | 58.49 | |||||||||
1957 | 45.23 | 52.64 | 55.23 | 57.33 | 62.35 | 66.57 | 68.45 | 69.37 | a | 75.63 | 65.39 | 58.83 | a | 53.42 | 60.87 | |||||||||||
1958 | 54.58 | 58.07 | 55.29 | 58.40 | 63.26 | 68.33 | 69.35 | 69.48 | 69.50 | 65.16 | 54.40 | 56.19 | 61.84 | |||||||||||||
1959 | 50.71 | 50.57 | 53.23 | 58.77 | 62.10 | a | 64.73 | 66.66 | b | 66.23 | 64.77 | 63.00 | 57.70 | 52.26 | 59.23 | |||||||||||
1960 | 48.81 | 52.39 | a | 53.26 | 56.90 | 59.29 | 62.53 | 64.90 | a | 66.19 | 68.00 | 62.74 | 54.83 | 53.19 | 58.59 | |||||||||||
1961 | 56.61 | 53.57 | 53.52 | 55.07 | 60.35 | 65.72 | a | 67.79 | b | 67.53 | a | 65.53 | 62.10 | a | 54.93 | a | 50.00 | b | 59.39 | |||||||
1962 | 49.77 | 52.79 | 52.26 | 56.55 | a | 56.90 | a | 62.37 | 64.58 | 68.45 | 67.19 | c | 63.48 | 56.89 | c | 55.00 | 58.85 | |||||||||
1963 | 48.55 | 59.68 | 54.10 | 56.60 | 62.81 | 62.83 | a | 66.41 | b | 66.45 | 70.03 | 62.65 | 55.30 | 54.26 | 59.97 | |||||||||||
1964 | 50.27 | a | 52.03 | 51.71 | 54.40 | 58.71 | 63.03 | 65.79 | b | 66.90 | 67.44 | e | 66.48 | 53.87 | 47.65 | 58.19 | ||||||||||
1965 | 50.77 | 51.25 | 59.59 | b | 57.27 | 57.68 | 62.50 | b | 66.58 | 68.87 | a | 67.15 | c | 64.68 | 57.53 | 49.27 | a | 59.43 | ||||||||
1966 | 50.61 | c | 51.96 | 53.41 | b | 58.53 | 59.07 | a | 64.25 | b | 65.90 | a | 67.33 | a | 69.33 | 63.33 | a | 57.03 | a | 52.45 | b | 59.43 | ||||
1967 | 50.77 | 52.46 | 51.65 | 54.57 | 60.29 | 64.21 | a | 68.21 | b | 69.84 | 73.17 | 63.81 | 58.17 | 48.57 | a | 59.64 | ||||||||||
1968 | 50.35 | 59.83 | 56.19 | 55.48 | a | 61.10 | 64.37 | 67.67 | a | 67.97 | b | 68.93 | b | 61.83 | b | 56.27 | 47.87 | 59.82 | ||||||||
1969 | 43.52 | 50.74 | a | 56.06 | 56.00 | 61.78 | d | 65.73 | 65.87 | 67.55 | 65.50 | 63.10 | 59.03 | 53.61 | 59.04 | |||||||||||
1970 | 51.03 | 60.18 | 56.67 | a | 54.53 | 59.97 | a | 63.61 | b | 65.68 | 65.74 | 67.50 | 64.03 | 56.97 | 49.61 | 59.63 | ||||||||||
1971 | 48.10 | 52.39 | 51.45 | 56.93 | 59.77 | 62.67 | 65.55 | 70.77 | 69.43 | 62.34 | b | 53.83 | 48.29 | 58.46 | ||||||||||||
1972 | 45.93 | a | 51.59 | 54.81 | 54.57 | 62.10 | 64.87 | 68.82 | c | 69.61 | 65.48 | a | 64.45 | 55.50 | 46.61 | 58.69 | ||||||||||
1973 | 48.84 | 57.25 | 53.68 | 57.83 | 62.16 | 63.90 | 66.29 | 64.84 | 68.57 | b | 61.35 | 51.87 | 53.77 | a | 59.20 | |||||||||||
1974 | 47.60 | a | 50.36 | 54.03 | 56.83 | 58.52 | 63.07 | a | 65.93 | a | 66.94 | 74.07 | 63.67 | a | 55.93 | 53.19 | 59.18 | |||||||||
1975 | 48.87 | 50.61 | 52.35 | 53.93 | c | 60.94 | 61.67 | 67.55 | 65.97 | b | 75.54 | b | 58.71 | c | 52.96 | c | 51.42 | 58.38 | ||||||||
1976 | 52.87 | a | 51.26 | b | 51.07 | b | 57.43 | b | 62.64 | f | 63.09 | g | 68.00 | f | 67.56 | d | 70.79 | b | 65.48 | 61.21 | b | 54.82 | c | 59.16 | c | |
1977 | 53.45 | b | 57.25 | 52.48 | 58.24 | a | 59.00 | b | 65.24 | a | 67.46 | c | 68.34 | b | 66.90 | 63.40 | a | 53.00 | b | 51.50 | a | 59.69 | ||||
1978 | 52.90 | 54.96 | b | 57.74 | l | 58.12 | f | 63.31 | b | 69.12 | e | 69.87 | h | 69.80 | f | 69.86 | i | 70.15 | d | 53.59 | c | 47.40 | a | 58.78 | e | |
1979 | 46.83 | b | 50.74 | a | 59.70 | d | 59.33 | 64.10 | 65.70 | 70.08 | e | 70.56 | d | 73.31 | a | 65.64 | c | 58.19 | c | 54.04 | e | 61.52 | ||||
1980 | 48.52 | b | 55.70 | b | 55.04 | f | 61.07 | 61.52 | 63.75 | b | 69.30 | a | ----- | z | 69.92 | d | 69.17 | a | 58.04 | b | 54.42 | 61.14 | b | |||
1981 | 58.79 | c | 56.96 | e | 59.00 | a | 59.39 | b | 62.64 | c | 66.57 | b | 68.96 | e | 70.77 | e | 70.96 | b | 64.07 | a | 58.36 | b | 53.03 | b | 62.46 | |
1982 | 48.30 | d | 51.42 | d | 56.28 | b | 56.34 | a | 61.73 | a | 63.43 | b | 67.96 | c | 70.63 | a | ----- | z | 66.16 | 55.81 | c | 52.13 | a | 59.11 | a | |
1983 | 55.35 | 56.08 | b | 58.10 | a | 63.10 | 65.03 | b | 66.39 | b | 70.77 | 72.93 | a | 70.39 | b | 64.40 | a | 56.41 | a | 48.38 | b | 62.28 | ||||
1984 | 54.59 | b | 58.07 | 59.03 | a | 58.23 | 61.62 | b | 64.70 | 69.00 | a | 71.16 | 70.90 | 60.42 | 55.27 | 49.81 | e | 61.07 | ||||||||
1985 | 55.65 | 51.42 | b | 54.29 | c | 57.43 | 62.59 | d | 67.41 | c | 70.83 | a | 71.04 | e | 68.38 | d | 60.67 | a | 48.36 | b | 53.55 | b | 60.13 | |||
1986 | 56.63 | a | 53.74 | a | 59.93 | a | 56.29 | b | 61.90 | 66.90 | a | 66.87 | a | 69.63 | a | 64.73 | 63.53 | a | 56.26 | c | 54.90 | a | 60.94 | |||
1987 | 53.03 | 56.46 | 59.19 | 62.37 | 64.39 | c | 65.63 | c | 66.23 | 67.74 | 68.59 | a | 69.68 | 58.40 | 50.47 | a | 61.85 | |||||||||
1988 | 51.58 | 55.45 | 56.06 | 58.52 | a | 62.19 | 65.14 | b | 68.10 | a | 68.33 | d | 68.04 | c | 64.45 | 55.31 | a | 53.29 | 60.54 | |||||||
1989 | 50.03 | a | 46.46 | 53.00 | 63.77 | 62.45 | 66.07 | c | 68.80 | a | 68.74 | 74.67 | 62.29 | 56.86 | b | 54.23 | a | 60.61 | ||||||||
1990 | 51.48 | 51.75 | 57.03 | 58.40 | 60.48 | 64.97 | a | 69.87 | 70.40 | a | 71.38 | a | 61.19 | 55.47 | 45.77 | 59.85 | ||||||||||
1991 | 51.06 | 59.04 | 53.40 | a | 55.77 | 59.30 | a | 60.48 | a | 65.50 | a | 65.16 | 71.46 | b | 62.10 | a | 55.90 | a | 53.06 | 59.35 | ||||||
1992 | 54.60 | a | 59.39 | a | 58.61 | 60.10 | a | 63.10 | 64.00 | 65.87 | 67.17 | b | 64.93 | 62.48 | 54.83 | 48.81 | 60.33 | |||||||||
1993 | 48.17 | a | 53.14 | 55.94 | 56.70 | 64.58 | 64.14 | a | 64.48 | 69.00 | 64.77 | 63.58 | 52.87 | 53.00 | 59.20 | |||||||||||
1994 | 53.97 | 50.29 | 57.97 | 56.13 | 61.35 | 62.60 | 64.13 | 69.17 | a | 68.17 | 60.71 | 50.53 | 49.97 | a | 58.75 | |||||||||||
1995 | 53.71 | 55.29 | 57.00 | 57.17 | 58.61 | 60.88 | d | 67.37 | a | 66.40 | a | 68.83 | a | 62.00 | 58.59 | a | 52.94 | 59.90 | ||||||||
1996 | 50.19 | 53.07 | 56.00 | 57.73 | 57.77 | 62.21 | a | 65.19 | 66.13 | 64.60 | 60.97 | 54.03 | a | 51.20 | a | 58.26 | ||||||||||
1997 | 51.87 | 52.71 | 52.93 | b | 57.43 | b | 65.82 | c | 64.87 | 67.16 | 70.52 | 70.59 | a | 60.13 | ----- | z | 52.83 | a | 60.62 | a | ||||||
1998 | 52.53 | a | 54.33 | a | 55.45 | 56.30 | c | 58.35 | 60.41 | c | 64.77 | a | 65.97 | a | 64.79 | a | 62.74 | 53.90 | 48.17 | a | 58.14 | |||||
1999 | 50.70 | a | 50.39 | 53.27 | a | 55.70 | 55.72 | b | 60.60 | 62.72 | b | 65.07 | b | 65.59 | c | 62.70 | a | 56.52 | a | 53.83 | a | 57.73 | ||||
2000 | 49.07 | a | 53.62 | 51.97 | a | 58.00 | c | 59.84 | 62.11 | c | 64.36 | f | 64.93 | b | 66.97 | a | 61.70 | a | 52.87 | 52.71 | 57.62 | a | ||||
2001 | 53.67 | a | 53.04 | c | 54.13 | a | 53.45 | a | 59.10 | 60.45 | a | 62.07 | c | 66.00 | c | 63.61 | b | 62.00 | a | 54.93 | a | ----- | z | 58.40 | a | |
2002 | 45.89 | m | 52.30 | h | 50.72 | b | 54.46 | b | 57.34 | b | 62.18 | b | 65.31 | b | 63.85 | e | 66.28 | a | 61.17 | b | 59.14 | a | 53.03 | 59.35 | b | |
2003 | 56.41 | b | 53.08 | c | 53.08 | g | 54.97 | a | 59.88 | e | 63.68 | h | 65.44 | f | 65.42 | e | 65.66 | a | 62.65 | 52.86 | b | 51.84 | 58.08 | c | ||
2004 | 49.71 | 54.79 | a | 55.61 | 60.89 | b | 60.67 | a | 63.25 | b | 67.39 | c | 68.62 | b | 64.85 | c | 60.96 | g | 54.52 | e | 54.06 | o | 60.03 | b | ||
2005 | ----- | z | 55.88 | c | 58.00 | c | 56.17 | 62.03 | b | 63.10 | 65.74 | h | 66.59 | n | 63.10 | j | 59.43 | h | 54.30 | j | 52.67 | d | 57.97 | f | ||
2006 | 52.04 | e | 52.45 | f | 51.97 | b | 57.12 | d | ----- | z | 60.62 | d | 63.17 | h | 61.67 | m | 65.90 | j | 58.77 | e | 51.65 | j | 51.00 | j | 56.10 | g |
2007 | 50.23 | i | 51.30 | e | 52.94 | m | 55.09 | g | 57.77 | e | 58.91 | g | 65.67 | s | 64.62 | g | 63.79 | k | 60.32 | l | 52.74 | k | 48.38 | o | 54.54 | j |
2008 | 45.44 | o | 51.25 | i | 49.33 | g | 52.21 | b | 54.29 | g | 57.10 | i | 61.87 | p | 63.25 | g | 62.32 | h | 59.92 | f | 57.00 | c | 45.45 | b | 51.55 | i |
2009 | 50.31 | b | 51.86 | g | 48.70 | d | 52.12 | e | 57.63 | a | 61.93 | c | 62.67 | m | 64.28 | b | 66.38 | d | 58.17 | h | 53.23 | d | 47.12 | g | 56.82 | d |
2010 | 54.39 | h | 56.52 | c | 56.80 | f | 55.00 | b | 55.50 | e | 59.57 | g | 61.77 | i | 64.61 | m | ----- | z | 61.38 | g | 52.38 | a | 50.86 | b | 54.05 | g |
2011 | 50.55 | 47.58 | b | 51.44 | f | 52.00 | e | 55.70 | h | 62.76 | m | 64.21 | l | 65.26 | l | 67.11 | l | 61.37 | l | 54.18 | m | 49.33 | d | 49.86 | h | |
2012 | 51.71 | g | 50.00 | e | 49.61 | 56.04 | d | 56.74 | d | 60.93 | c | ----- | z | ----- | z | 65.70 | j | 60.38 | e | 55.60 | 49.58 | e | 54.86 | d | ||
2013 | 48.32 | 49.84 | c | 52.41 | d | 54.70 | c | 59.76 | b | 63.36 | b | ----- | z | 65.67 | d | 65.89 | c | 59.37 | a | 55.36 | b | ----- | z | 57.47 | b | |
2014 | 54.16 | 49.78 | a | 54.77 | a | 57.73 | 62.46 | c | 62.30 | c | 66.08 | e | 65.83 | a | 71.73 | 64.45 | b | 56.41 | a | 54.73 | a | 60.04 | ||||
2015 | 56.13 | a | 57.86 | 58.48 | 57.24 | a | 57.72 | b | 62.00 | b | 68.43 | c | 68.60 | k | 65.85 | d | 65.59 | b | 55.32 | b | 50.85 | d | 59.59 | a | ||
2016 | 53.10 | a | 55.59 | l | 55.48 | d | 61.05 | h | 61.43 | a | 63.36 | b | 64.88 | f | 66.20 | a | 65.50 | b | 60.88 | g | 58.72 | e | 47.17 | b | 58.87 | d |
2017 | 47.33 | d | 51.52 | c | 53.20 | f | 56.68 | b | 58.96 | d | 63.52 | c | 65.39 | h | 68.48 | d | 68.23 | d | 63.12 | e | 54.93 | b | 53.45 | b | 58.62 | b |
2018 | 54.39 | 47.84 | c | 52.69 | b | 55.62 | d | 59.54 | e | 62.79 | f | 63.65 | e | 66.16 | l | 65.65 | d | 62.96 | h | 56.68 | e | 52.38 | e | 56.49 | c | |
2019 | 54.39 | c | 45.28 | c | 55.93 | d | 54.87 | g | 58.72 | f | 62.21 | p | 67.38 | e | 69.08 | g | 66.71 | f | 59.67 | g | 56.38 | d | 52.38 | g | 55.87 | g |
2020 | 51.92 | g | 50.42 | e | 50.57 | c | 57.04 | e | 63.68 | c | 63.05 | i | 66.22 | h | 66.41 | b | 71.00 | j | 61.36 | f | 56.11 | l | 55.95 | l | 57.62 | g |
2021 | 52.70 | h | 48.64 | f | 51.76 | f | 60.52 | e | 58.23 | e | 66.50 | r | 64.17 | h | 64.83 | g | 67.12 | f | 59.80 | f | 56.38 | d | 49.86 | i | 58.38 | i |
2022 | 54.35 | e | 52.70 | h | 53.14 | j | 53.65 | j | 57.24 | n | 61.63 | k | 66.00 | h | 68.56 | d | 69.45 | h | 64.00 | c | 52.60 | 49.31 | e | 57.76 | g | |
2023 | 52.92 | f | 50.25 | h | 50.74 | h | 55.29 | i | 59.15 | e | 61.26 | c | 65.10 | j | 69.21 | g | 66.35 | g | 64.26 | d | 56.00 | p | 56.74 | l | 61.56 | i |
2024 | 52.62 | j | 52.71 | h | 56.47 | p | 57.50 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 51.13 | 53.06 | 54.57 | 57.15 | 60.68 | 63.89 | 66.87 | 67.77 | 68.17 | 63.25 | 55.89 | 51.78 | 59.68 | |||||||||||||
S.D. | 3.41 | 3.49 | 2.95 | 2.44 | 2.28 | 2.09 | 1.93 | 1.88 | 2.68 | 2.34 | 2.42 | 2.48 | 1.23 | |||||||||||||
SKEW | -0.48 | 0.26 | 0.36 | 0.28 | -0.07 | 0.32 | 0.02 | 0.20 | 0.74 | 0.54 | -0.36 | -0.54 | 0.33 | |||||||||||||
MAX | 58.79 | 60.82 | 62.36 | 63.77 | 65.82 | 69.12 | 70.83 | 72.93 | 75.63 | 70.15 | 61.60 | 56.19 | 62.46 | |||||||||||||
MIN | 40.63 | 45.28 | 48.62 | 52.00 | 55.50 | 60.41 | 62.07 | 63.85 | 63.61 | 58.71 | 48.36 | 45.45 | 56.65 | |||||||||||||
YRS | 84 | 86 | 83 | 88 | 88 | 83 | 75 | 80 | 80 | 81 | 86 | 84 | 64 |