YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1937 | 38.18 | 44.48 | 49.45 | 51.57 | a | 58.83 | a | 62.98 | 65.13 | 64.48 | 63.60 | 60.10 | 52.03 | 49.03 | b | 54.99 | ||||||||||
1938 | 48.21 | 48.31 | a | 48.23 | 54.17 | 58.35 | 60.62 | 65.61 | 63.87 | 63.75 | 57.31 | 50.15 | 49.62 | a | 55.68 | |||||||||||
1939 | 46.80 | a | 45.43 | a | 49.81 | 57.43 | 58.95 | 61.25 | 64.89 | 65.06 | 66.60 | a | 59.60 | 53.17 | 49.63 | a | 56.55 | |||||||||
1940 | 49.61 | 50.38 | 53.18 | a | 56.27 | 58.53 | 62.41 | a | 65.18 | 63.63 | 63.55 | 58.77 | a | 50.65 | 50.67 | a | 56.90 | |||||||||
1941 | 48.17 | b | 49.62 | 54.00 | 53.23 | 61.06 | 61.68 | 65.50 | 66.10 | a | 62.86 | a | 57.33 | a | 53.75 | 48.07 | a | 56.78 | ||||||||
1942 | 48.73 | a | 48.32 | 51.18 | 54.63 | 57.92 | 63.34 | a | 66.82 | 64.53 | a | 63.02 | 64.16 | c | 56.67 | c | 47.92 | 57.27 | ||||||||
1943 | ----- | z | 50.98 | 54.08 | 56.40 | 61.10 | 61.33 | 65.42 | 64.42 | a | 66.12 | 58.77 | 53.67 | 48.23 | 58.23 | a | ||||||||||
1944 | ----- | z | 46.78 | 52.18 | a | 52.34 | a | 58.29 | 60.03 | 63.26 | 64.19 | 65.32 | 60.21 | 49.38 | b | 49.00 | 56.45 | a | ||||||||
1945 | 47.00 | a | 49.07 | a | 47.65 | a | 55.09 | a | 56.90 | a | 63.70 | 66.79 | 64.73 | 63.62 | 58.77 | 49.93 | 47.56 | 55.90 | ||||||||
1946 | 45.19 | 44.88 | 49.11 | 53.79 | a | 57.41 | b | 61.90 | a | 64.76 | 64.61 | 65.33 | a | 56.77 | a | 49.30 | 47.55 | 55.05 | ||||||||
1947 | 45.18 | 50.81 | a | 53.55 | a | 57.33 | 59.55 | a | 62.92 | 64.89 | 64.71 | 64.30 | 58.84 | 49.25 | 47.10 | a | 56.54 | |||||||||
1948 | 49.90 | 46.43 | 47.98 | 51.47 | a | 56.48 | 62.15 | 63.27 | 64.32 | a | 62.62 | 59.55 | 51.02 | 42.90 | a | 54.84 | ||||||||||
1949 | 39.02 | 44.02 | 49.68 | 56.43 | 58.10 | 62.48 | 62.81 | 63.52 | 65.52 | 57.27 | 57.08 | 45.20 | c | 55.09 | ||||||||||||
1950 | 42.06 | 48.59 | 50.39 | 54.82 | 55.85 | g | 60.70 | 63.80 | a | 66.23 | 62.91 | c | 59.89 | 57.03 | 50.18 | 56.05 | a | |||||||||
1951 | 45.68 | 47.64 | 50.29 | 52.50 | 57.77 | 59.42 | 63.48 | 62.63 | 63.12 | b | 57.37 | e | 51.65 | 44.89 | 54.70 | |||||||||||
1952 | 43.66 | 48.07 | 47.03 | 53.72 | 59.46 | h | 58.28 | 64.89 | 64.50 | 66.10 | i | 60.02 | 48.95 | 46.60 | 53.57 | b | ||||||||||
1953 | 49.63 | 49.17 | b | 49.74 | 50.67 | a | 54.27 | 58.23 | 64.35 | 62.98 | 64.93 | 58.67 | e | 53.43 | 48.77 | c | 55.41 | |||||||||
1954 | 45.65 | 52.70 | a | 48.08 | 56.35 | 58.32 | a | 61.25 | 67.48 | 62.60 | 63.62 | b | 57.85 | 53.57 | 46.60 | 56.17 | ||||||||||
1955 | 43.50 | 47.30 | 51.16 | 50.39 | g | 59.00 | b | 61.92 | 61.63 | 64.79 | 64.28 | 58.90 | 52.18 | 48.47 | a | 55.74 | a | |||||||||
1956 | 47.13 | 45.48 | 50.31 | 53.07 | 57.57 | a | 64.00 | a | 62.81 | e | 64.25 | c | 65.15 | 56.42 | a | 53.93 | 47.73 | 55.65 | ||||||||
1957 | 43.45 | a | 50.36 | 50.74 | 54.93 | 57.82 | a | 64.93 | c | 64.90 | a | 63.63 | 64.26 | a | 58.08 | 50.12 | a | 46.87 | 55.84 | |||||||
1958 | 47.45 | a | 51.98 | b | 47.76 | 54.80 | 58.92 | 63.08 | 65.18 | 66.05 | 68.97 | 62.87 | 53.88 | 52.42 | a | 57.78 | ||||||||||
1959 | 48.71 | 47.38 | 54.28 | a | 56.59 | a | 57.16 | 63.55 | 68.08 | 66.07 | a | 63.40 | 61.56 | 53.05 | 47.94 | 57.31 | ||||||||||
1960 | 45.11 | 48.02 | 52.60 | a | 55.42 | 57.24 | 64.77 | 67.21 | 64.44 | 65.98 | 57.48 | 50.33 | 46.71 | b | 56.28 | |||||||||||
1961 | 48.76 | 50.62 | 49.71 | 55.47 | 55.63 | 65.17 | 71.39 | 69.44 | 65.95 | a | 60.66 | 50.67 | 46.06 | 57.46 | ||||||||||||
1962 | 46.67 | a | 48.67 | b | 47.31 | 57.19 | a | 56.82 | 56.63 | 62.66 | 66.95 | 63.03 | 59.07 | a | 54.70 | 48.00 | a | 55.64 | ||||||||
1963 | 44.66 | 54.50 | a | 48.94 | 51.17 | 57.19 | 61.10 | 63.76 | 64.69 | 65.57 | 60.58 | 50.70 | 47.61 | 55.87 | ||||||||||||
1964 | 46.15 | 48.68 | a | 50.08 | 53.42 | 55.87 | 63.33 | a | 66.23 | 65.18 | 63.35 | 62.71 | 49.18 | 49.60 | 56.15 | |||||||||||
1965 | 48.32 | 52.68 | 52.66 | 56.60 | 60.16 | 60.37 | 66.03 | 67.95 | 63.08 | 61.39 | 51.42 | 45.28 | v | 58.24 | a | |||||||||||
1966 | 46.37 | 47.21 | 52.90 | 57.97 | 59.05 | a | 63.90 | a | 65.10 | 66.55 | c | 64.38 | d | 60.44 | n | 52.93 | a | 49.31 | e | 56.88 | a | |||||
1967 | 48.53 | a | 51.80 | 51.23 | 46.80 | c | 58.42 | 60.41 | b | ----- | z | 69.88 | j | 68.86 | a | 64.48 | 56.28 | 47.77 | 55.46 | b | ||||||
1968 | 47.06 | 54.24 | 53.52 | 56.97 | 59.02 | 65.87 | 67.50 | 67.23 | 67.12 | 60.23 | 54.27 | 45.77 | 58.23 | |||||||||||||
1969 | 48.65 | 46.32 | 51.79 | 54.37 | 61.58 | 62.95 | a | 67.00 | 68.37 | 66.52 | 60.21 | 56.18 | 50.90 | 57.90 | ||||||||||||
1970 | 50.00 | 52.96 | 55.02 | 53.72 | 62.68 | a | 64.48 | 68.94 | 67.76 | 67.83 | 58.77 | 54.91 | a | 46.68 | 58.65 | |||||||||||
1971 | 49.42 | 50.39 | 51.37 | 52.90 | 56.23 | 64.03 | 66.02 | 68.82 | 66.52 | 56.97 | 50.98 | 43.15 | 56.40 | |||||||||||||
1972 | 46.24 | 51.33 | 56.13 | 53.76 | a | 59.98 | 62.82 | 68.50 | d | 67.89 | 64.83 | 59.50 | 50.93 | b | 45.08 | a | 57.25 | |||||||||
1973 | 47.03 | 51.68 | 50.66 | 57.37 | 62.65 | 69.35 | 66.90 | 66.52 | 65.35 | 60.02 | 50.83 | 50.11 | 58.21 | |||||||||||||
1974 | 47.21 | 49.59 | 53.55 | 56.03 | 60.23 | 65.58 | 68.34 | 68.05 | 67.55 | 62.19 | 53.50 | 48.52 | 58.36 | |||||||||||||
1975 | 49.94 | 50.80 | 50.89 | 51.62 | 61.52 | 63.13 | 66.94 | 66.87 | 66.78 | 59.31 | 52.10 | 50.39 | 57.52 | |||||||||||||
1976 | 50.21 | 50.00 | 51.92 | 54.55 | 62.13 | 66.65 | 68.63 | 67.76 | 66.55 | 63.35 | 58.28 | 49.68 | 59.14 | |||||||||||||
1977 | 49.34 | 54.41 | 50.58 | 57.70 | 57.13 | 65.57 | 68.24 | 69.03 | 64.92 | 62.56 | 56.27 | 53.11 | 59.07 | |||||||||||||
1978 | 52.03 | 52.62 | 57.42 | 55.22 | 64.13 | 65.13 | 67.71 | 67.63 | 66.68 | 62.63 | 51.78 | 46.27 | 59.11 | |||||||||||||
1979 | 47.11 | 48.57 | a | 53.61 | 56.63 | 61.79 | 65.92 | 68.47 | 67.40 | 70.40 | 63.21 | 54.12 | 51.26 | 59.04 | ||||||||||||
1980 | 51.42 | ----- | z | 53.26 | 56.97 | 58.55 | 63.27 | 68.18 | 66.00 | 65.03 | 61.89 | 54.90 | 52.03 | 59.23 | a | |||||||||||
1981 | 51.39 | 52.82 | 52.50 | 58.28 | 61.76 | 70.62 | 66.82 | 67.44 | 65.38 | 57.71 | 54.50 | a | 51.31 | 59.21 | ||||||||||||
1982 | 46.03 | 52.71 | 50.40 | 55.12 | 60.13 | 62.45 | 66.50 | 68.11 | 65.73 | 60.90 | 52.07 | 49.03 | 57.43 | |||||||||||||
1983 | 51.85 | 52.54 | 53.45 | 53.30 | 60.55 | 64.68 | 67.87 | 69.71 | 68.83 | 63.13 | 52.37 | 51.02 | 59.11 | |||||||||||||
1984 | 51.07 | a | 51.05 | 55.94 | 55.68 | 65.06 | 64.22 | 69.48 | 69.08 | 71.57 | 59.37 | 50.60 | 46.66 | 59.15 | ||||||||||||
1985 | 47.48 | 52.05 | 49.63 | 60.18 | 59.29 | 67.42 | 70.03 | 66.63 | 63.60 | a | 59.03 | 50.57 | b | 49.56 | 57.96 | |||||||||||
1986 | 52.50 | 53.59 | 56.74 | 56.57 | 61.27 | 66.05 | 66.23 | a | 67.05 | 60.98 | 60.97 | 55.48 | 49.18 | 58.88 | ||||||||||||
1987 | 47.76 | 51.18 | 52.21 | 60.07 | 62.95 | 64.28 | 65.18 | 66.44 | 67.22 | 64.27 | 53.25 | 47.73 | 58.54 | |||||||||||||
1988 | 49.24 | 53.93 | 56.58 | 57.82 | 60.05 | 64.27 | 69.45 | 67.48 | 65.85 | 61.39 | 53.38 | 47.92 | 58.95 | |||||||||||||
1989 | 47.34 | 47.50 | 54.25 | a | 60.03 | 60.90 | 65.55 | a | 68.06 | 65.44 | 64.68 | 59.98 | 54.50 | 50.13 | 58.20 | |||||||||||
1990 | 48.81 | 48.61 | a | 54.06 | 60.12 | 59.90 | 66.00 | 69.00 | 68.58 | 66.90 | 63.00 | 53.58 | 43.73 | 58.52 | ||||||||||||
1991 | 48.37 | 54.64 | 48.35 | 54.38 | 58.23 | 61.02 | 66.27 | 67.68 | 66.62 | 63.81 | 55.57 | 49.13 | 57.84 | |||||||||||||
1992 | 48.56 | 53.47 | 55.15 | 60.97 | 63.31 | 64.15 | 69.05 | 69.27 | 66.87 | 63.58 | 53.95 | 47.03 | 59.61 | |||||||||||||
1993 | 47.32 | 48.64 | 56.18 | 57.22 | 61.29 | 66.97 | 65.73 | 68.73 | 65.87 | 62.34 | 52.75 | 48.77 | 58.48 | |||||||||||||
1994 | 49.60 | 48.07 | 55.48 | 56.72 | 59.05 | a | 64.95 | 63.85 | 67.61 | 65.40 | 59.37 | 47.28 | 45.94 | 56.94 | ||||||||||||
1995 | 50.44 | 54.46 | 51.69 | 55.03 | 57.95 | 63.63 | 69.74 | 68.21 | 66.60 | 62.47 | 59.05 | 51.73 | a | 59.25 | ||||||||||||
1996 | 50.56 | 54.02 | 55.77 | 59.70 | 61.95 | 66.43 | 71.11 | 70.28 | a | 66.37 | 62.35 | 54.13 | 50.94 | 60.30 | ||||||||||||
1997 | 50.48 | 52.75 | 56.76 | 59.50 | 67.31 | 65.88 | 67.98 | 70.02 | 70.45 | a | 61.03 | a | 54.73 | 47.98 | 60.41 | |||||||||||
1998 | 50.58 | 49.57 | 53.60 | 54.58 | 55.13 | a | 62.48 | 68.50 | 70.48 | 67.37 | 58.61 | 52.03 | 44.90 | 57.32 | ||||||||||||
1999 | 48.53 | 48.61 | 49.27 | 55.12 | 57.82 | 62.18 | 66.82 | 67.71 | 66.50 | 63.60 | 54.50 | b | 48.31 | 57.41 | ||||||||||||
2000 | 49.44 | 51.47 | 54.45 | 58.52 | 62.81 | 66.47 | 66.39 | 67.90 | 67.65 | 60.10 | 49.62 | 49.29 | 58.67 | |||||||||||||
2001 | 45.77 | 49.02 | 55.90 | ----- | z | 65.93 | a | 67.37 | 66.98 | 68.16 | 65.72 | 62.24 | 54.60 | a | 47.68 | 59.03 | a | |||||||||
2002 | 45.37 | 51.70 | 51.44 | 55.95 | ----- | z | 65.45 | 67.05 | 67.29 | 68.02 | 60.85 | 56.60 | 49.65 | 58.12 | a | |||||||||||
2003 | 55.63 | 51.62 | 56.05 | 53.90 | 62.24 | 65.95 | 69.13 | 68.71 | b | 68.57 | ----- | z | 51.03 | 49.65 | 59.32 | a | ||||||||||
2004 | 49.27 | 49.40 | 59.63 | 58.53 | 61.76 | 64.43 | 67.56 | 68.74 | 67.40 | a | 60.32 | 52.88 | a | 50.15 | a | 59.17 | ||||||||||
2005 | 50.15 | 52.84 | 55.63 | 55.17 | 60.89 | 62.87 | 68.18 | 67.42 | 64.07 | 61.13 | a | 56.20 | 51.03 | 58.80 | ||||||||||||
2006 | 49.45 | 51.73 | 48.56 | 54.87 | 62.00 | 67.00 | a | 71.50 | a | 65.95 | a | 65.30 | 59.85 | 54.78 | 48.56 | 58.30 | ||||||||||
2007 | 46.85 | 51.09 | a | 56.34 | 56.90 | 60.68 | 65.08 | 67.69 | b | 68.72 | a | 65.78 | a | 59.90 | 55.57 | a | 46.17 | a | 58.40 | |||||||
2008 | 46.22 | a | 50.69 | 53.63 | 56.47 | a | 60.10 | 66.23 | 68.05 | a | 68.07 | a | 67.08 | 63.67 | a | 57.35 | 46.98 | a | 58.71 | |||||||
2009 | 52.27 | a | 49.94 | c | 52.67 | e | 56.33 | c | 61.93 | a | 63.91 | c | 67.24 | 68.22 | d | 69.18 | e | 61.17 | b | 53.58 | 47.68 | 58.68 | ||||
2010 | 50.18 | a | 51.73 | 52.28 | b | 53.20 | e | 57.16 | 64.39 | b | 64.67 | b | 65.81 | b | 67.46 | c | 60.73 | a | 52.50 | b | 49.82 | 57.50 | ||||
2011 | 51.93 | a | 48.46 | a | 51.76 | b | 55.23 | b | 57.16 | 61.78 | a | 66.19 | d | 65.18 | 68.06 | e | 66.95 | c | 53.54 | c | 50.24 | 58.04 | ||||
2012 | 51.52 | a | 52.83 | 53.71 | c | 61.11 | c | 65.00 | b | 68.35 | d | 69.90 | 70.29 | 67.30 | 65.53 | 58.27 | 50.65 | 61.20 | ||||||||
2013 | 49.58 | 52.64 | 57.45 | 61.78 | 64.31 | 68.38 | 70.24 | 70.89 | 69.00 | 60.29 | 55.73 | 48.95 | 60.77 | |||||||||||||
2014 | 54.53 | 53.16 | 56.81 | 58.70 | 64.34 | 66.60 | 71.03 | 69.18 | 67.13 | 65.73 | 56.12 | 53.53 | 61.40 | |||||||||||||
2015 | 54.11 | 56.73 | 58.00 | 56.48 | 59.08 | 65.17 | a | 67.69 | m | 68.58 | a | 70.60 | 65.18 | 53.42 | 48.95 | 59.66 | a | |||||||||
2016 | 52.02 | 58.43 | 54.76 | f | 61.26 | e | 63.94 | 70.18 | 69.82 | 69.65 | 69.55 | 62.48 | 56.70 | 49.40 | 62.13 | a | ||||||||||
2017 | 48.79 | 52.36 | 58.53 | a | 59.13 | 64.42 | 68.90 | 71.92 | 72.42 | 72.12 | 65.11 | 57.07 | 51.31 | 61.84 | ||||||||||||
2018 | 52.95 | 53.57 | 54.34 | 58.73 | 62.74 | 67.37 | 72.71 | 70.19 | 66.25 | 64.40 | 56.87 | 51.66 | 60.98 | |||||||||||||
2019 | 52.63 | 48.02 | 53.65 | 61.07 | 61.40 | 68.40 | 70.24 | 72.79 | 70.60 | 63.08 | 55.63 | 50.98 | 60.71 | |||||||||||||
2020 | 50.98 | 54.81 | 53.87 | 59.88 | 65.87 | 69.33 | 69.79 | 73.74 | 72.43 | 68.26 | 55.53 | 51.39 | 62.16 | |||||||||||||
2021 | 51.74 | 52.79 | 52.50 | 58.08 | 63.24 | 68.73 | 70.71 | 70.94 | 69.65 | 61.87 | 58.55 | 49.45 | 60.69 | |||||||||||||
2022 | 52.58 | 54.16 | 57.48 | 59.12 | 64.11 | 70.98 | 70.85 | 72.66 | 73.47 | 63.90 | 51.80 | 49.35 | 61.71 | |||||||||||||
2023 | 50.16 | 47.68 | 50.19 | 58.37 | 61.02 | 64.90 | 71.82 | 74.03 | 67.87 | 66.35 | 57.80 | 52.98 | 60.26 | |||||||||||||
2024 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 48.53 | 50.59 | 52.65 | 56.10 | 60.19 | 64.30 | 67.20 | 67.30 | 66.35 | 61.09 | 53.51 | 48.69 | 58.09 | |||||||||||||
S.D. | 3.07 | 2.85 | 2.96 | 2.78 | 2.77 | 2.85 | 2.46 | 2.52 | 2.46 | 2.55 | 2.61 | 2.20 | 1.83 | |||||||||||||
SKEW | -0.64 | -0.04 | 0.12 | -0.26 | 0.29 | 0.02 | 0.04 | 0.38 | 0.58 | 0.41 | -0.01 | -0.28 | 0.16 | |||||||||||||
MAX | 55.63 | 58.43 | 59.63 | 61.78 | 67.31 | 70.98 | 72.71 | 74.03 | 73.47 | 68.26 | 59.05 | 53.53 | 62.16 | |||||||||||||
MIN | 38.18 | 44.02 | 47.03 | 46.80 | 54.27 | 56.63 | 61.63 | 62.60 | 60.98 | 56.42 | 47.28 | 42.90 | 54.70 | |||||||||||||
YRS | 85 | 86 | 86 | 85 | 84 | 87 | 85 | 86 | 86 | 85 | 87 | 86 | 73 |