YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1930 | 35.63 | p | 46.13 | e | 47.05 | 50.79 | a | 50.85 | 56.08 | 57.98 | 61.64 | c | 57.88 | 51.97 | 50.52 | 47.68 | a | 52.60 | a | |||||||
1931 | 50.44 | 47.92 | c | 50.00 | b | 51.93 | 55.36 | b | 58.45 | 61.43 | b | 61.53 | b | 63.61 | c | 59.40 | a | 51.00 | b | 44.16 | 54.60 | |||||
1932 | 43.24 | 42.97 | 48.55 | 50.12 | 52.11 | 58.58 | e | 58.60 | 60.31 | 58.15 | 54.57 | b | 50.34 | e | 41.90 | a | 51.62 | |||||||||
1933 | 42.85 | 42.68 | 45.60 | 49.02 | b | 50.40 | a | 57.60 | 58.50 | 60.75 | c | 57.28 | a | ----- | z | ----- | z | 47.00 | 51.17 | b | ||||||
1934 | 47.25 | a | 52.52 | 52.44 | 52.15 | 55.35 | a | 55.75 | 58.66 | 60.05 | 56.69 | c | 54.19 | 50.52 | 46.18 | 53.48 | ||||||||||
1935 | 42.76 | 46.80 | 42.37 | a | 47.60 | 50.65 | 56.79 | a | 57.95 | 57.75 | a | 57.97 | 50.61 | 43.80 | 45.50 | 50.05 | ||||||||||
1936 | 45.37 | 40.47 | 43.74 | 50.33 | 54.48 | 59.08 | 60.92 | 62.02 | a | 55.63 | 54.55 | a | 47.12 | 44.90 | 51.55 | |||||||||||
1937 | 34.23 | a | 42.34 | 47.37 | 47.10 | 51.60 | 56.66 | a | 58.17 | a | 58.92 | 58.50 | a | 56.40 | 50.18 | 46.05 | 50.63 | |||||||||
1938 | 45.03 | 44.25 | 45.50 | a | 50.13 | 51.00 | 54.95 | 57.24 | 57.82 | 59.03 | 54.14 | b | 47.15 | 44.65 | 50.91 | |||||||||||
1939 | 43.97 | 41.12 | 44.67 | a | 49.02 | 51.82 | a | 55.02 | 57.60 | 59.56 | d | 57.12 | 53.45 | 50.67 | 48.37 | 51.03 | ||||||||||
1940 | 46.90 | a | 47.53 | 48.65 | a | 51.28 | 54.27 | 56.81 | a | 59.73 | 60.92 | a | 60.67 | 56.76 | 46.00 | 46.89 | 53.03 | |||||||||
1941 | 47.06 | 49.70 | 51.46 | c | 51.88 | 54.34 | b | 58.83 | c | 62.63 | 59.77 | 58.30 | 54.92 | a | 49.85 | c | 45.58 | 53.69 | ||||||||
1942 | 44.11 | 44.79 | 45.79 | 50.40 | 53.40 | 56.59 | a | 64.02 | b | 62.47 | b | 59.21 | a | 55.71 | 48.33 | 46.35 | 52.60 | |||||||||
1943 | 40.19 | 48.32 | 46.02 | 50.62 | 51.45 | 56.43 | 58.79 | 60.24 | 58.74 | a | 55.15 | 49.88 | 45.37 | 51.77 | ||||||||||||
1944 | 45.58 | 45.02 | 45.31 | 49.43 | 52.66 | b | 56.02 | 59.13 | 60.17 | a | 58.35 | 56.77 | 48.98 | 44.95 | 51.86 | |||||||||||
1945 | 46.06 | 45.88 | 44.69 | 47.68 | 53.89 | 55.20 | 58.47 | 57.90 | 56.92 | 52.63 | 46.53 | a | 44.98 | 50.90 | ||||||||||||
1946 | 45.10 | 44.61 | 45.27 | 47.33 | 54.61 | 56.03 | 60.38 | a | 58.97 | a | 59.14 | a | 50.68 | 46.67 | 45.10 | a | 51.16 | |||||||||
1947 | 41.37 | 47.95 | 49.44 | 51.54 | b | 54.67 | a | 58.20 | 61.18 | 60.87 | 59.17 | a | 55.05 | 49.03 | 48.24 | 53.06 | ||||||||||
1948 | 45.29 | 42.60 | 45.74 | 46.73 | 53.85 | 59.82 | 59.73 | 61.27 | 59.05 | a | 55.30 | a | 42.28 | 36.60 | 50.69 | |||||||||||
1949 | 35.21 | b | 41.86 | 47.23 | a | 50.43 | 54.19 | b | 54.72 | 57.81 | 60.77 | 60.36 | a | 50.61 | 53.30 | 44.08 | 50.88 | |||||||||
1950 | 34.97 | 43.82 | 45.23 | 47.57 | a | 50.31 | 58.17 | 58.35 | a | 60.74 | 57.20 | 52.03 | a | 48.68 | 49.98 | 50.59 | ||||||||||
1951 | 43.15 | 44.93 | a | 43.53 | 48.93 | 52.94 | 57.08 | 59.98 | a | 59.15 | 58.08 | 54.26 | b | 49.80 | 42.55 | 51.20 | ||||||||||
1952 | 41.45 | 43.81 | 43.39 | 47.82 | 52.23 | 55.15 | 58.81 | 59.62 | a | 57.84 | a | 56.77 | 46.05 | 44.89 | 50.65 | |||||||||||
1953 | 47.82 | 44.72 | a | 45.87 | 48.05 | 52.21 | b | 54.50 | 58.85 | 60.48 | 59.50 | 54.62 | b | 50.57 | 46.66 | 51.99 | ||||||||||
1954 | 40.85 | 45.89 | a | 43.00 | 46.81 | a | 51.98 | a | 54.03 | 56.71 | 58.53 | a | 57.71 | a | 53.13 | 51.67 | 45.27 | 50.47 | ||||||||
1955 | 43.06 | 42.88 | 41.88 | b | 44.55 | a | 50.63 | a | 55.43 | a | 58.33 | a | 58.25 | a | 56.88 | b | 53.24 | d | 44.50 | a | 43.24 | 49.41 | ||||
1956 | 43.68 | a | 40.39 | a | 43.92 | 49.10 | 53.85 | 55.97 | 60.03 | a | 60.35 | a | 58.57 | 52.95 | a | 47.16 | a | 44.58 | a | 50.88 | ||||||
1957 | 38.08 | 44.64 | 47.61 | 49.77 | 54.73 | 58.53 | 59.77 | 60.80 | a | 62.97 | 55.05 | a | 48.81 | a | 46.68 | 52.29 | ||||||||||
1958 | 48.23 | 51.18 | 45.92 | 50.32 | 55.74 | 61.67 | 62.32 | 61.31 | 59.74 | a | 55.73 | 47.58 | 50.22 | a | 54.16 | |||||||||||
1959 | 45.56 | 44.30 | 46.74 | 51.27 | 53.57 | a | 58.32 | 59.21 | b | 58.98 | a | 57.40 | 54.97 | 47.77 | 43.81 | 51.82 | ||||||||||
1960 | 42.53 | 44.96 | a | 45.84 | 49.52 | 51.87 | 56.10 | 56.75 | a | 59.47 | 57.60 | 55.00 | a | 47.55 | 45.52 | a | 51.06 | |||||||||
1961 | 48.48 | 47.88 | 46.50 | 48.10 | 52.45 | 57.12 | a | 60.43 | b | 60.32 | a | 56.98 | 52.93 | a | 45.10 | a | 43.26 | b | 51.63 | |||||||
1962 | 42.03 | 45.14 | 44.21 | 48.78 | a | 51.12 | a | 54.62 | 57.66 | 60.45 | 58.37 | c | 54.13 | 49.02 | c | 46.21 | 50.98 | |||||||||
1963 | 39.55 | 50.81 | a | 45.27 | 48.17 | 54.89 | 56.36 | a | 59.71 | b | 59.92 | 61.18 | 54.71 | 48.73 | b | 47.10 | 52.20 | |||||||||
1964 | 44.67 | a | 43.84 | 45.06 | 47.02 | 50.77 | 56.22 | 59.34 | b | 59.42 | 57.70 | e | 56.26 | 45.53 | 41.76 | 50.63 | ||||||||||
1965 | 43.50 | 45.29 | 48.48 | b | 49.52 | 50.95 | 55.11 | b | 59.16 | 61.52 | a | 58.58 | d | 56.37 | 51.35 | 42.62 | a | 51.87 | ||||||||
1966 | 44.00 | f | 44.77 | 45.05 | b | 50.73 | 50.90 | a | 56.18 | b | 59.43 | a | 59.02 | a | 60.28 | 54.07 | a | 49.88 | a | 47.52 | b | 52.53 | a | |||
1967 | 45.68 | 45.39 | 44.32 | 45.47 | 52.37 | 57.91 | a | 60.40 | b | 61.47 | 62.05 | 56.13 | 50.52 | 43.43 | a | 52.09 | ||||||||||
1968 | 44.21 | 50.98 | 48.95 | 47.98 | a | 53.31 | 57.12 | 60.60 | a | 60.41 | b | 59.73 | b | 53.43 | b | 49.70 | 42.27 | 52.39 | ||||||||
1969 | 38.08 | 43.00 | b | 46.78 | a | 48.87 | 54.00 | d | 59.87 | 58.90 | 59.40 | 58.17 | 53.85 | 49.62 | 46.87 | 51.45 | ||||||||||
1970 | 44.84 | 50.25 | 47.43 | a | 47.13 | 51.95 | a | 56.00 | b | 58.71 | 58.44 | 57.48 | 53.95 | a | 49.78 | 43.29 | 51.60 | |||||||||
1971 | 42.81 | 44.95 | 43.74 | 48.27 | 52.18 | 55.43 | 57.97 | 62.32 | 58.55 | 52.53 | b | 47.71 | a | 42.32 | 50.73 | |||||||||||
1972 | 40.53 | a | 43.67 | 47.37 | a | 46.35 | 53.82 | 56.88 | 60.45 | c | 60.34 | 55.79 | a | 53.13 | 48.67 | 40.48 | 50.62 | |||||||||
1973 | 42.61 | 47.68 | 46.29 | 49.65 | 53.58 | 56.80 | 58.23 | 57.32 | 58.82 | b | 52.74 | 45.25 | 47.07 | a | 51.34 | |||||||||||
1974 | 41.35 | a | 44.12 | 46.73 | 49.33 | 51.44 | 54.97 | a | 57.18 | a | 59.08 | 61.17 | 52.30 | a | 48.22 | a | 46.37 | 51.02 | ||||||||
1975 | 43.04 | d | 43.29 | 44.35 | 45.58 | d | 52.35 | 55.00 | 59.92 | 59.22 | b | 62.32 | b | 52.80 | c | 46.41 | c | 45.44 | 50.81 | |||||||
1976 | 45.40 | a | 43.83 | b | 43.59 | b | 48.71 | b | 53.16 | f | 55.09 | g | 59.06 | g | 59.83 | d | 61.46 | b | 55.13 | 50.50 | b | 46.46 | d | 50.55 | c | |
1977 | 43.72 | b | 48.88 | 45.23 | 49.81 | a | 51.53 | b | 57.22 | a | 58.80 | c | 60.90 | b | 58.05 | 53.48 | b | 46.38 | b | 45.80 | a | 51.65 | ||||
1978 | 46.66 | 48.22 | c | 48.74 | l | 49.16 | h | 53.67 | b | 60.00 | f | 60.93 | h | 61.52 | g | 59.72 | l | 57.02 | d | 43.87 | c | 40.05 | b | 48.25 | f | |
1979 | 39.60 | b | 44.86 | c | 49.38 | g | 50.58 | 54.76 | 56.35 | 61.29 | e | 61.80 | d | 62.34 | a | 56.84 | c | 47.82 | e | 48.60 | f | 53.62 | b | |||
1980 | 40.33 | b | 48.20 | b | 47.74 | f | 50.93 | 53.23 | 56.07 | b | 60.75 | a | ----- | z | 59.14 | e | 56.52 | a | 50.52 | b | 47.27 | 52.30 | b | |||
1981 | 49.52 | c | 47.30 | e | 48.97 | a | 50.02 | d | 53.94 | d | 58.04 | b | 59.79 | e | 61.38 | f | 58.10 | i | 51.80 | c | 48.46 | b | 44.03 | b | 51.19 | b |
1982 | 40.63 | d | 43.83 | d | 46.69 | b | 46.55 | a | 52.03 | a | 56.41 | b | 59.28 | f | 60.78 | b | ----- | z | 56.15 | 46.61 | c | 44.32 | a | 49.40 | b | |
1983 | 47.53 | 48.77 | b | 48.85 | a | 50.47 | 55.24 | b | 57.27 | b | 62.06 | 62.58 | a | 57.77 | b | 52.35 | a | 49.84 | b | 40.09 | b | 52.73 | ||||
1984 | 46.18 | c | 48.55 | 50.31 | b | 49.20 | 52.63 | d | 56.36 | a | 58.92 | a | 60.00 | a | 59.12 | 52.47 | 47.68 | 42.63 | e | 52.00 | ||||||
1985 | 43.29 | 41.75 | b | 43.89 | c | 48.90 | 52.80 | d | 57.28 | c | 60.55 | a | 59.87 | e | 57.63 | d | 52.22 | b | 40.88 | b | 42.43 | b | 50.12 | |||
1986 | 48.22 | b | 45.54 | b | 51.03 | b | 47.83 | d | 53.37 | 57.83 | a | 59.74 | d | 59.66 | b | 55.62 | 54.64 | b | 49.10 | e | 46.60 | a | 52.43 | |||
1987 | 45.00 | a | 47.98 | 48.65 | g | 51.98 | 55.61 | c | 56.22 | c | 58.97 | 59.50 | 58.24 | a | 56.21 | 51.05 | 42.82 | a | 53.05 | a | ||||||
1988 | 44.42 | 47.29 | 47.70 | a | 50.72 | a | 53.82 | 56.07 | b | 59.53 | a | 59.83 | d | 57.46 | c | 56.82 | a | 49.88 | a | 46.10 | 52.47 | |||||
1989 | 44.62 | b | 38.80 | 46.38 | a | 53.52 | 53.85 | 58.93 | c | 60.63 | a | 61.29 | 61.57 | 53.60 | 49.91 | b | 46.05 | a | 52.43 | |||||||
1990 | 45.71 | 44.38 | 48.58 | 51.50 | 53.42 | 57.97 | a | 61.63 | 62.63 | a | 61.50 | a | 53.06 | 49.60 | 38.45 | 52.37 | ||||||||||
1991 | 43.50 | 50.36 | 45.10 | a | 48.68 | 53.13 | a | 55.04 | b | 58.77 | a | 59.76 | 60.66 | b | 52.55 | a | 49.93 | a | 46.90 | 52.03 | ||||||
1992 | 48.08 | a | 50.80 | a | 50.11 | 52.41 | a | 54.40 | 57.92 | 59.50 | 59.98 | b | 57.19 | a | 54.31 | 48.90 | 42.60 | 53.02 | ||||||||
1993 | 41.20 | a | 43.84 | 48.73 | 50.53 | 56.52 | 57.52 | a | 59.42 | 61.19 | 56.42 | 55.27 | 44.22 | 45.56 | 51.70 | |||||||||||
1994 | 47.21 | 43.79 | 49.34 | 50.40 | 53.66 | 56.07 | 58.40 | 61.67 | a | 59.85 | 52.35 | 44.23 | 44.32 | a | 51.77 | |||||||||||
1995 | 48.39 | 47.91 | 46.80 | a | 49.17 | 52.94 | 55.42 | d | 61.03 | a | 58.57 | a | 61.64 | a | 54.02 | 51.62 | a | 47.05 | 52.88 | |||||||
1996 | 44.56 | 45.14 | 48.32 | 51.43 | 51.60 | 55.64 | a | 58.42 | 58.58 | 56.28 | 52.80 | a | 47.95 | a | 44.40 | a | 51.26 | |||||||||
1997 | 45.76 | 45.57 | 46.69 | b | 49.66 | b | 57.07 | c | 58.20 | 60.55 | a | 63.10 | 62.16 | a | 53.87 | ----- | z | 45.73 | a | 53.49 | a | |||||
1998 | 46.93 | a | 47.65 | a | 48.32 | 48.06 | c | 52.55 | 56.37 | d | 59.85 | a | 59.53 | a | 56.98 | a | 54.16 | 48.80 | 42.40 | a | 51.80 | |||||
1999 | 44.87 | a | 45.02 | 45.48 | a | 46.72 | 49.36 | b | 54.87 | 56.97 | b | 59.38 | b | 55.93 | c | 53.15 | a | 50.66 | b | 46.98 | b | 50.78 | ||||
2000 | 43.05 | a | 46.40 | 44.97 | a | 49.87 | c | 52.90 | a | 55.80 | c | 58.20 | f | 58.78 | b | 58.53 | a | 53.90 | a | 45.13 | 45.66 | 50.45 | a | |||
2001 | 46.12 | a | 44.12 | d | 47.02 | a | 46.81 | a | 51.32 | a | 53.88 | a | 56.98 | c | 59.80 | c | 56.39 | b | 53.31 | b | 48.61 | l | ----- | z | 51.58 | b |
2002 | 40.70 | p | 45.12 | h | 43.78 | b | 47.30 | b | 50.12 | b | 56.32 | b | 58.86 | b | 57.38 | e | 56.90 | a | 52.34 | c | 50.48 | a | 46.65 | 52.01 | b | |
2003 | 49.28 | b | 44.80 | c | 47.40 | g | 48.10 | a | 51.69 | e | 56.20 | h | 58.56 | f | 58.62 | f | 57.34 | a | 55.81 | 45.84 | b | 45.55 | 49.80 | d | ||
2004 | 44.63 | 47.04 | a | 47.90 | 50.52 | b | 54.32 | a | 57.09 | b | 60.91 | c | 62.41 | b | 57.65 | c | 53.38 | g | 46.92 | f | 47.25 | o | 53.61 | c | ||
2005 | ----- | z | 45.46 | e | 48.86 | c | 49.73 | 55.45 | b | 56.65 | 58.93 | h | 59.03 | n | 53.68 | k | 53.39 | h | 46.24 | k | 45.21 | e | 50.23 | f | ||
2006 | 46.85 | e | 43.61 | f | 44.12 | b | 48.38 | d | ----- | z | 55.67 | d | 57.24 | h | 56.36 | m | 56.11 | l | 50.04 | e | 46.67 | l | 44.17 | k | 49.01 | g |
2007 | 41.61 | i | 44.48 | e | 46.97 | m | 47.24 | g | 50.44 | e | 53.16 | h | 62.80 | u | 58.71 | g | 55.26 | k | 51.37 | l | 46.06 | l | 42.90 | p | 47.46 | j |
2008 | 41.46 | s | 45.20 | i | 43.43 | h | 44.61 | b | 50.02 | h | 52.48 | j | 57.00 | p | 58.24 | h | 55.89 | h | 52.41 | h | 50.81 | c | 40.55 | b | 45.32 | i |
2009 | 44.28 | f | 43.29 | g | 43.22 | d | 46.28 | e | 51.37 | a | 56.69 | d | 56.47 | m | 59.33 | b | 58.87 | d | 52.30 | h | 49.12 | d | 39.67 | g | 52.12 | e |
2010 | 49.20 | i | 48.76 | c | 48.28 | f | 48.45 | b | 49.58 | e | 53.89 | g | 56.32 | i | 57.97 | m | ----- | z | 52.54 | g | 46.57 | a | 45.78 | b | 47.83 | g |
2011 | 44.74 | 41.21 | b | 45.00 | f | 44.96 | e | 49.67 | h | 56.47 | m | 57.03 | l | 59.84 | l | 57.58 | l | 53.68 | l | 45.06 | m | 41.54 | f | 43.64 | i | |
2012 | 44.77 | g | 43.56 | e | 43.55 | 49.08 | e | 50.57 | d | 55.20 | c | ----- | z | ----- | z | 56.38 | j | 52.23 | e | 49.70 | 44.60 | e | 48.56 | d | ||
2013 | 41.97 | 44.78 | e | 46.07 | d | 48.94 | c | 53.45 | b | 57.11 | b | ----- | z | 60.06 | d | 59.74 | c | 50.72 | b | 48.41 | b | ----- | z | 51.13 | b | |
2014 | 46.68 | 43.60 | b | 48.47 | a | 50.52 | 55.70 | c | 57.20 | c | 59.96 | e | 60.37 | a | 62.10 | 57.53 | b | 49.26 | a | 48.12 | a | 53.29 | ||||
2015 | 48.38 | a | 50.91 | 50.29 | 48.71 | a | 52.67 | b | 56.18 | b | 61.59 | c | 61.20 | k | 57.60 | d | 57.60 | b | 47.50 | c | 45.57 | d | 52.46 | a | ||
2016 | 47.27 | a | 48.26 | l | 48.96 | d | 53.41 | h | 54.47 | a | 56.62 | b | 59.76 | f | 60.33 | a | 57.77 | b | 54.35 | g | 52.70 | e | 40.69 | b | 52.35 | d |
2017 | 40.31 | d | 44.20 | c | 47.38 | f | 49.77 | b | 52.52 | d | 57.09 | c | 57.98 | h | 60.19 | d | 58.62 | d | 53.31 | e | 49.20 | b | 45.47 | b | 51.07 | b |
2018 | 48.77 | 42.62 | c | 45.16 | c | 49.52 | d | 54.10 | g | 57.35 | f | 58.46 | g | 60.61 | q | 56.83 | f | 53.89 | i | 47.92 | e | 46.06 | e | 46.68 | f | |
2019 | 46.68 | c | 38.98 | c | 45.65 | d | 49.02 | g | 52.16 | f | 56.68 | p | 61.04 | e | 62.69 | g | 59.79 | f | 51.02 | h | 48.10 | d | 46.56 | g | 48.09 | g |
2020 | 47.21 | g | 43.54 | e | 43.50 | c | 48.58 | e | 55.70 | c | 57.00 | i | 58.98 | h | 59.88 | b | 62.27 | j | 54.28 | f | 48.75 | l | 47.55 | l | 50.24 | g |
2021 | 46.20 | h | 44.07 | f | 44.02 | f | 50.16 | e | 52.35 | e | 58.04 | r | 58.11 | h | 58.62 | g | 57.28 | g | 52.56 | f | 50.65 | d | 43.59 | i | 51.05 | i |
2022 | 46.19 | e | 43.95 | h | 47.05 | j | 46.12 | j | 49.88 | n | 55.84 | k | 59.67 | h | 62.00 | d | 60.61 | h | 55.88 | c | 44.37 | 43.73 | e | 50.43 | g | |
2023 | 46.40 | f | 42.88 | h | 42.74 | h | 48.14 | i | 53.23 | e | 55.11 | c | 57.10 | j | 61.23 | g | 57.39 | g | 55.50 | d | 46.89 | p | 50.05 | l | 54.61 | i |
2024 | 47.10 | j | 45.79 | h | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 44.21 | 45.47 | 46.44 | 49.07 | 52.94 | 56.63 | 59.47 | 60.14 | 58.73 | 54.18 | 48.36 | 44.84 | 51.70 | |||||||||||||
S.D. | 3.29 | 2.86 | 2.28 | 1.84 | 1.68 | 1.42 | 1.47 | 1.28 | 1.86 | 1.86 | 2.37 | 2.42 | 1.04 | |||||||||||||
SKEW | -0.78 | 0.24 | 0.34 | -0.29 | 0.09 | 0.72 | 0.41 | 0.07 | 0.66 | 0.12 | -0.71 | -0.75 | 0.52 | |||||||||||||
MAX | 50.44 | 52.52 | 52.44 | 53.52 | 57.07 | 61.67 | 64.02 | 63.10 | 63.61 | 59.40 | 53.30 | 50.22 | 54.60 | |||||||||||||
MIN | 34.23 | 38.80 | 41.88 | 44.55 | 49.36 | 53.88 | 56.71 | 57.32 | 55.62 | 50.04 | 40.88 | 36.60 | 49.41 | |||||||||||||
YRS | 82 | 86 | 81 | 88 | 87 | 82 | 73 | 78 | 78 | 81 | 84 | 82 | 60 |