YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.37 | a | 59.52 | 58.12 | m | ----- | z | ----- | z | ----- | z | 58.94 | j | |
1949 | 39.94 | 43.27 | 48.87 | 51.08 | 54.48 | a | 56.05 | 57.18 | 58.79 | 58.11 | b | 52.42 | 54.32 | 45.37 | 51.66 | |||||||||||
1950 | 41.33 | a | 47.25 | 46.88 | a | 49.40 | 51.55 | 57.00 | b | 59.05 | b | 58.29 | 57.05 | 55.38 | b | 53.03 | 52.55 | 52.40 | ||||||||
1951 | 46.19 | 47.68 | 44.90 | 48.98 | b | 54.03 | 56.02 | 57.89 | 59.86 | i | 55.63 | 55.69 | 52.67 | 45.39 | 51.37 | a | ||||||||||
1952 | 43.77 | 46.71 | 45.31 | 49.30 | 53.65 | 55.12 | 58.66 | 57.26 | 57.50 | 53.81 | 48.48 | 46.68 | 51.35 | |||||||||||||
1953 | 50.29 | 47.23 | 45.97 | 48.13 | 52.87 | 54.95 | 59.29 | 59.76 | b | 60.43 | 55.82 | a | 52.83 | 48.19 | 52.98 | |||||||||||
1954 | 46.57 | a | 48.39 | 47.34 | 50.16 | a | 52.26 | 54.57 | 57.26 | 59.16 | 58.70 | b | 55.31 | 53.20 | 48.07 | a | 52.58 | |||||||||
1955 | 44.80 | a | 44.50 | 46.15 | 45.93 | a | 50.92 | 54.70 | b | 56.53 | a | 55.24 | h | 56.96 | c | 53.18 | i | 49.31 | a | 48.40 | a | 49.82 | b | |||
1956 | 47.26 | 43.43 | 46.37 | 49.07 | b | 53.26 | f | 55.76 | c | 57.90 | a | 59.06 | 57.23 | d | 53.06 | 49.15 | d | 46.34 | f | 51.83 | b | |||||
1957 | 42.98 | 48.42 | b | 49.11 | c | 51.24 | c | 55.72 | d | 60.02 | d | 59.73 | a | 59.65 | a | 61.97 | 56.52 | d | 50.20 | c | 48.48 | e | 53.67 | |||
1958 | 50.24 | d | 53.88 | g | 47.50 | 51.77 | o | 55.53 | 60.60 | a | 60.92 | a | 62.10 | 61.84 | b | 55.14 | b | 52.38 | e | 52.58 | f | 56.25 | c | |||
1959 | 49.40 | 47.09 | 49.40 | 52.19 | c | 52.98 | a | 57.50 | c | 59.09 | b | 59.27 | a | 57.48 | b | 56.15 | e | 50.64 | e | 48.12 | j | 53.74 | a | |||
1960 | 47.47 | 47.66 | 49.31 | b | 50.20 | b | 52.81 | 56.82 | e | 56.60 | a | 59.73 | c | 56.13 | d | 54.46 | g | 50.57 | b | 49.40 | b | 52.43 | a | |||
1961 | 50.80 | a | 49.38 | c | 49.34 | b | 49.92 | 52.48 | c | 57.70 | g | 58.67 | a | 59.73 | c | 58.10 | d | 53.31 | e | 48.25 | 46.48 | 52.41 | a | |||
1962 | 45.52 | a | 47.18 | 47.23 | a | 50.43 | b | 51.71 | 54.34 | a | 57.87 | 59.95 | c | 58.82 | 55.76 | d | 51.55 | b | 50.52 | h | 52.76 | a | ||||
1963 | 44.57 | d | 54.30 | 48.11 | c | 48.65 | 53.11 | 56.73 | 59.68 | 59.00 | 59.98 | c | 56.44 | 51.55 | a | 49.92 | a | 53.50 | ||||||||
1964 | 46.81 | 49.17 | 46.39 | 49.07 | 51.69 | 56.53 | 59.44 | 58.92 | a | 57.97 | 55.19 | 49.98 | 47.88 | a | 52.42 | |||||||||||
1965 | 47.24 | 47.36 | 49.23 | 51.21 | b | 52.00 | 56.30 | 58.30 | a | 61.53 | 56.97 | 56.46 | e | 53.60 | a | 46.43 | c | 53.05 | ||||||||
1966 | 47.32 | 46.66 | 47.98 | 52.28 | 53.79 | 58.88 | a | 60.10 | 60.78 | a | 61.14 | b | 55.55 | b | 52.69 | a | 49.07 | d | 53.85 | |||||||
1967 | 47.31 | g | 47.88 | g | 47.41 | i | 47.40 | j | 53.14 | i | 58.68 | e | 60.23 | a | 60.61 | 61.34 | b | 56.80 | h | 53.75 | 46.23 | 56.81 | f | |||
1968 | 46.69 | 52.36 | a | 50.24 | 49.53 | 53.83 | a | 58.17 | c | 59.76 | 60.82 | a | 60.58 | f | 54.43 | h | 51.59 | n | 46.58 | m | 53.93 | d | ||||
1969 | 42.52 | d | 44.94 | b | 49.69 | 49.53 | a | 54.97 | a | 59.12 | 60.11 | 60.03 | 59.48 | d | 55.86 | j | 51.83 | g | 50.30 | a | 53.07 | b | ||||
1970 | 51.17 | a | 51.45 | 51.08 | 49.38 | 55.31 | b | 56.98 | c | 58.29 | 57.98 | 59.02 | 53.26 | 51.28 | l | 46.06 | 53.63 | a | ||||||||
1971 | 45.93 | a | 46.36 | 46.13 | 48.00 | 51.61 | 53.78 | 57.90 | a | 61.63 | 59.63 | 53.65 | d | 49.75 | b | 44.39 | 51.56 | |||||||||
1972 | 45.07 | b | 47.48 | a | 49.55 | b | 49.18 | b | 53.31 | 57.73 | 60.55 | a | 60.16 | 56.90 | f | 56.65 | a | 50.98 | e | 42.76 | h | 53.07 | b | |||
1973 | 46.41 | b | 50.04 | d | 46.66 | 50.87 | 53.50 | 57.20 | 58.89 | h | 57.89 | d | 59.56 | c | 54.85 | 48.95 | b | 50.44 | g | 52.59 | b | |||||
1974 | 46.29 | 46.55 | i | 48.90 | k | 50.50 | h | 52.17 | k | 55.23 | d | 58.87 | a | 59.91 | c | 59.12 | e | 55.19 | e | 49.13 | g | 47.67 | g | 55.77 | f | |
1975 | 46.58 | f | 47.73 | h | 46.73 | g | 46.26 | i | 52.81 | d | 56.52 | j | 59.09 | h | 58.75 | o | 58.40 | e | 56.68 | a | 50.02 | c | 48.52 | f | 54.48 | h |
1976 | 45.97 | m | 43.58 | j | 43.70 | k | 46.57 | h | 51.13 | d | 55.72 | g | 59.91 | d | 60.87 | 60.72 | e | 58.93 | q | ----- | z | ----- | z | 58.16 | h | |
1977 | ----- | z | 49.27 | b | 45.30 | d | 49.29 | a | 51.22 | a | 58.19 | d | 57.94 | 59.15 | 58.12 | 54.90 | a | 50.29 | b | 50.34 | 53.09 | a | ||||
1978 | 51.57 | d | 49.93 | f | 52.68 | c | 50.68 | 54.35 | e | 57.64 | b | 59.47 | a | 60.83 | a | 60.25 | 58.58 | g | 48.60 | e | 45.17 | b | 54.12 | b | ||
1979 | 46.15 | a | 47.73 | 50.43 | b | 51.23 | 55.14 | b | 56.29 | a | 61.20 | f | 61.26 | d | 63.17 | a | 58.55 | 53.15 | g | 51.38 | f | 54.44 | c | |||
1980 | 47.20 | d | 52.50 | b | 49.19 | 53.08 | 53.98 | c | 55.88 | d | 60.69 | b | 59.35 | e | 58.78 | a | 55.67 | d | 50.80 | c | 48.88 | b | 53.83 | |||
1981 | 50.58 | a | 49.24 | a | 48.65 | a | 50.28 | 54.16 | 58.65 | 58.28 | a | 60.43 | a | 59.08 | 55.18 | 53.03 | 50.44 | 54.00 | ||||||||
1982 | 45.76 | 47.52 | 47.21 | 48.50 | b | 52.77 | c | 57.21 | d | 57.65 | d | 59.40 | b | 60.19 | a | 56.13 | a | 49.34 | b | 47.03 | a | 52.39 | ||||
1983 | 49.22 | a | 49.80 | 49.26 | 48.50 | c | 52.77 | c | 56.94 | c | 59.38 | f | 59.56 | e | 60.22 | c | 55.48 | c | 50.33 | c | 47.29 | e | 52.67 | a | ||
1984 | 48.70 | c | 47.85 | f | 50.43 | b | 49.40 | a | 52.77 | a | 55.63 | c | 59.67 | e | 61.48 | a | 59.45 | b | 53.37 | a | 49.67 | a | 46.66 | c | 53.38 | a |
1985 | 48.52 | c | 47.73 | 47.10 | a | 52.02 | c | 53.16 | 58.53 | a | 60.33 | b | 59.28 | a | 58.62 | a | 55.43 | a | 45.96 | f | 47.56 | e | 53.48 | a | ||
1986 | 51.50 | a | 50.67 | a | 52.43 | a | 50.78 | 53.34 | b | 58.53 | a | 59.87 | a | 59.03 | b | 55.72 | c | 55.87 | a | 52.91 | a | 49.39 | c | 54.17 | ||
1987 | 47.62 | b | 49.50 | a | 50.82 | a | 51.82 | 55.87 | a | 57.88 | 59.00 | 60.16 | c | 57.95 | 57.78 | b | 53.50 | 46.75 | c | 54.05 | ||||||
1988 | 47.71 | 48.71 | a | 48.66 | b | 51.34 | a | 53.34 | 57.20 | 61.29 | 59.07 | c | 58.72 | 56.90 | 50.69 | a | 49.15 | a | 53.57 | |||||||
1989 | 46.33 | b | 43.12 | 48.10 | 54.10 | a | 54.33 | a | 57.74 | c | 59.19 | d | 61.27 | c | 56.32 | b | 54.35 | a | 51.31 | a | 48.47 | 52.89 | ||||
1990 | 47.52 | a | 44.85 | d | 48.76 | b | 52.34 | a | 53.90 | a | 57.48 | 61.00 | d | 61.40 | 60.34 | b | 54.88 | a | 49.39 | c | 41.74 | j | 53.81 | a | ||
1991 | 46.81 | b | 52.52 | a | ----- | z | 50.38 | b | 51.62 | e | 55.83 | d | 60.06 | 59.62 | g | 60.54 | c | 57.71 | e | 50.82 | h | 46.93 | j | 54.43 | d | |
1992 | 49.88 | j | 53.36 | k | 52.70 | i | 55.05 | h | 56.34 | l | 58.20 | h | 61.34 | i | 60.85 | k | 59.29 | k | 57.50 | k | 50.75 | l | 46.37 | l | ----- | z |
1993 | 45.82 | l | 48.26 | k | 51.86 | i | 52.15 | g | 55.82 | n | 59.16 | h | 59.95 | k | 60.19 | j | 56.97 | k | 58.56 | o | 49.27 | j | 48.52 | k | ----- | z |
1994 | 49.45 | l | 46.81 | j | 51.20 | h | 51.44 | l | 55.12 | k | 56.74 | i | 60.42 | m | 61.74 | h | 60.41 | m | 53.89 | l | 45.50 | h | 45.81 | m | ----- | z |
1995 | 49.73 | k | 49.69 | j | 49.88 | j | 50.03 | m | 53.00 | i | 55.24 | e | 60.58 | e | 60.64 | b | 59.07 | h | 55.21 | j | 51.59 | g | 49.21 | q | 58.82 | i |
1996 | 47.42 | g | 49.30 | f | 50.11 | d | 52.14 | b | 52.29 | g | 56.14 | e | 59.98 | d | 59.37 | a | 63.17 | x | 55.40 | e | 50.74 | k | 49.74 | f | 55.52 | f |
1997 | 49.24 | f | 48.68 | i | 49.84 | i | 51.19 | i | 58.06 | e | 58.94 | e | 62.29 | 62.37 | d | 62.39 | l | 55.21 | e | 52.43 | g | 49.14 | m | 59.37 | g | |
1998 | 51.58 | f | 49.52 | a | 50.76 | d | 50.67 | d | 54.98 | k | 57.73 | b | 60.43 | b | 61.69 | b | 61.10 | f | 56.17 | j | 50.04 | d | 45.35 | d | 53.27 | d |
1999 | 47.39 | c | 46.56 | c | 46.95 | 50.68 | b | 52.44 | 56.33 | 57.41 | c | 60.26 | b | 59.85 | 55.52 | b | 53.25 | b | 47.35 | g | 53.33 | a | ||||
2000 | 47.45 | 50.31 | c | 48.87 | d | 53.62 | d | 55.12 | a | 59.82 | b | 59.12 | b | 60.29 | c | 60.96 | b | 54.83 | a | 48.84 | a | 48.57 | a | 53.98 | ||
2001 | 48.68 | c | 48.00 | 51.82 | a | 50.32 | 57.07 | c | 56.73 | 59.91 | b | 60.08 | 59.36 | b | 56.74 | 52.00 | a | 48.76 | b | 54.12 | ||||||
2002 | 46.67 | a | 49.63 | a | 48.56 | 52.05 | a | 54.37 | 57.37 | 61.70 | a | 61.16 | 60.93 | b | 55.16 | 54.30 | b | 49.89 | 54.32 | |||||||
2003 | 52.00 | c | 48.62 | 50.18 | a | 49.70 | 53.16 | 58.18 | b | 55.50 | c | 57.61 | 61.03 | a | 59.37 | a | 49.95 | a | 48.92 | s | 54.12 | a | ||||
2004 | 49.16 | c | 49.59 | a | 52.15 | 54.29 | a | 57.67 | g | 60.70 | 64.15 | a | 64.27 | a | 61.15 | 56.05 | a | 50.24 | c | 49.59 | b | 55.58 | a | |||
2005 | 48.92 | a | 50.29 | 52.80 | a | 52.43 | 58.29 | c | 59.43 | a | 63.76 | 62.18 | 60.13 | d | 56.73 | e | 50.61 | c | 48.13 | e | 55.31 | |||||
2006 | 49.79 | x | 49.62 | l | 47.11 | 50.83 | 54.68 | c | 58.84 | b | 60.57 | d | 59.46 | d | 58.73 | f | 56.15 | 51.46 | c | 49.18 | a | 54.25 | c | |||
2007 | 45.59 | d | 47.40 | c | 50.69 | b | 50.69 | c | 54.10 | b | 56.00 | g | 62.29 | b | 62.76 | h | 60.08 | d | 54.82 | f | 50.58 | d | 45.41 | c | 51.87 | c |
2008 | 45.56 | g | 46.91 | a | 46.76 | b | 48.59 | b | 53.35 | d | 56.08 | e | 60.11 | c | 60.74 | b | 58.83 | 55.82 | a | 52.33 | 44.63 | 53.10 | a | |||
2009 | 49.35 | a | 47.43 | 47.06 | 49.57 | 54.90 | 58.37 | 58.66 | 60.22 | d | 60.03 | 55.32 | 51.55 | 46.39 | 53.24 | |||||||||||
2010 | 50.94 | 50.21 | 49.58 | 49.20 | 51.27 | 56.05 | 59.75 | g | 59.08 | 60.45 | 58.15 | 49.00 | 48.81 | 52.98 | a | |||||||||||
2011 | 50.02 | 48.48 | b | 49.06 | 49.22 | 51.29 | 56.57 | 60.29 | 61.79 | 61.00 | 58.60 | 50.03 | 47.95 | 53.69 | ||||||||||||
2012 | 48.08 | 48.12 | 46.34 | 51.05 | 53.85 | 56.00 | 59.39 | 60.34 | 57.77 | 55.90 | 53.20 | 45.90 | 53.00 | |||||||||||||
2013 | 46.19 | 47.23 | 49.37 | 51.59 | a | 55.06 | 58.78 | 61.68 | a | 61.00 | 60.38 | 53.11 | q | 51.40 | 45.58 | 53.48 | a | |||||||||
2014 | 50.63 | 49.09 | 52.50 | 52.92 | 58.23 | 59.35 | 62.19 | 62.94 | 61.85 | 60.16 | 55.27 | 53.26 | 56.53 | |||||||||||||
2015 | 51.45 | 54.07 | 53.19 | 52.23 | 55.34 | 59.53 | 63.50 | a | 62.98 | 60.53 | 59.03 | 50.50 | 49.35 | 55.98 | ||||||||||||
2016 | 50.89 | 53.00 | 52.61 | 55.17 | 57.27 | 59.35 | 61.73 | 60.89 | 61.20 | 57.40 | 55.08 | 46.56 | 55.93 | |||||||||||||
2017 | 45.87 | 49.61 | 51.00 | a | 51.65 | ----- | z | 58.48 | d | 63.08 | ----- | z | ----- | z | 56.60 | p | 51.17 | a | 48.20 | a | 52.38 | d | ||||
2018 | 50.11 | 47.55 | 47.63 | 51.28 | a | 56.13 | 59.30 | 61.90 | 60.92 | 60.68 | 56.38 | a | 53.45 | 48.32 | 54.47 | |||||||||||
2019 | 50.50 | 43.45 | 48.48 | 53.53 | a | 54.37 | 59.48 | b | 62.68 | 63.38 | a | 61.38 | e | 56.12 | c | 49.62 | b | 49.35 | h | 54.82 | a | |||||
2020 | 48.54 | c | 46.96 | e | 47.91 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.23 | j | 57.62 | k | 50.19 | q | 48.04 | s | 47.75 | j |
2021 | 48.08 | r | 45.64 | j | 46.40 | j | 49.95 | h | 52.89 | m | 57.33 | o | 60.59 | n | 60.50 | l | 62.08 | q | ----- | z | ----- | z | ----- | z | ----- | z |
2022 | 49.00 | o | 48.17 | m | 48.59 | i | 48.36 | i | 51.47 | l | 58.55 | i | 59.62 | o | 61.91 | h | 59.55 | i | 55.12 | k | 46.55 | j | 45.83 | k | ----- | z |
2023 | 49.48 | k | 43.08 | j | 43.30 | h | 48.83 | j | 52.48 | a | 55.88 | 59.79 | j | 62.67 | h | 59.00 | i | 52.57 | j | 52.71 | k | 49.65 | 52.67 | i | ||
2024 | 50.36 | j | 48.92 | i | 48.88 | n | 50.00 | s | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 47.63 | 48.34 | 48.87 | 50.67 | 53.80 | 57.34 | 59.77 | 60.28 | 59.41 | 55.87 | 51.26 | 47.92 | 53.60 | |||||||||||||
S.D. | 2.61 | 2.49 | 2.10 | 1.73 | 1.78 | 1.62 | 1.82 | 1.39 | 1.68 | 1.57 | 1.79 | 1.93 | 1.27 | |||||||||||||
SKEW | -0.53 | 0.13 | 0.22 | 0.22 | 0.65 | 0.01 | 0.25 | 0.40 | -0.34 | 0.40 | 0.37 | 0.35 | 0.41 | |||||||||||||
MAX | 52.00 | 54.30 | 53.19 | 55.17 | 58.29 | 60.70 | 64.15 | 64.27 | 63.17 | 60.16 | 55.27 | 53.26 | 56.53 | |||||||||||||
MIN | 39.94 | 43.13 | 44.90 | 45.93 | 50.92 | 53.78 | 55.50 | 57.26 | 55.63 | 52.42 | 48.25 | 44.39 | 51.35 | |||||||||||||
YRS | 59 | 58 | 61 | 61 | 61 | 65 | 64 | 63 | 60 | 56 | 57 | 50 | 29 |