YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 34.26 | 27.89 | b | 24.39 | 28.85 | i | ||
1946 | 24.68 | 25.79 | 28.06 | 29.59 | a | 36.87 | a | 42.07 | a | 47.03 | a | 43.61 | 37.27 | 29.79 | b | 25.53 | 27.10 | 33.12 | ||||||||
1947 | 19.03 | 26.43 | 29.03 | 31.47 | 38.16 | 38.50 | 41.77 | 39.43 | c | 38.70 | 35.68 | 28.80 | 27.10 | a | 32.84 | |||||||||||
1948 | 23.19 | 19.34 | 24.84 | 29.90 | 34.81 | 44.07 | 42.67 | a | 41.63 | a | 35.87 | 31.28 | b | 25.93 | a | 13.77 | 30.61 | |||||||||
1949 | 4.18 | c | 19.48 | a | 27.42 | 29.03 | 36.87 | 36.03 | 39.19 | 39.53 | a | 35.83 | 24.77 | a | 28.86 | b | 20.13 | 28.44 | ||||||||
1950 | 7.50 | a | 24.57 | 24.69 | b | 27.43 | b | 31.03 | 40.82 | b | 43.93 | a | 44.58 | 39.90 | a | 37.07 | a | 32.11 | c | 32.94 | 32.21 | |||||
1951 | 21.29 | 25.85 | a | 24.19 | 27.82 | b | 35.40 | a | 39.64 | b | 43.83 | a | 40.00 | d | 39.58 | d | 32.52 | 28.60 | e | 20.10 | a | 31.57 | ||||
1952 | 20.71 | 26.86 | h | 23.43 | c | 30.82 | b | 34.35 | 41.07 | a | 45.79 | c | 46.47 | a | 42.52 | a | 35.77 | a | 21.38 | a | 23.31 | b | 33.24 | a | ||
1953 | 33.03 | 25.96 | 27.14 | c | 29.00 | a | 33.79 | b | 37.38 | a | 41.93 | b | 44.07 | c | 39.86 | b | 33.07 | a | 32.53 | 27.36 | c | 33.76 | ||||
1954 | 20.83 | a | 28.18 | 19.81 | 28.23 | 33.06 | 38.93 | 44.03 | 43.32 | 39.27 | 30.81 | 32.20 | 23.45 | 31.84 | ||||||||||||
1955 | 22.13 | a | 20.21 | 22.31 | b | 26.10 | a | 32.57 | a | 40.10 | 41.37 | a | 39.50 | a | 38.07 | c | 33.65 | 23.97 | 22.52 | 30.21 | ||||||
1956 | 24.65 | 21.43 | a | 26.75 | c | 29.19 | c | 38.83 | b | 38.67 | 46.03 | 43.61 | 39.23 | 32.61 | 24.87 | 27.03 | 32.74 | |||||||||
1957 | 7.42 | 24.86 | 29.80 | a | 31.20 | 39.97 | 41.33 | 41.97 | 39.26 | 41.47 | 35.32 | 24.17 | 27.43 | a | 32.02 | |||||||||||
1958 | 27.61 | 32.75 | 24.97 | 29.07 | 39.42 | 45.57 | 47.81 | 48.58 | 40.23 | 34.77 | 29.37 | 30.77 | a | 35.91 | ||||||||||||
1959 | 25.57 | a | 22.64 | 26.77 | 27.43 | 31.13 | 40.13 | 44.77 | 41.45 | 39.70 | 33.29 | 23.30 | 22.84 | 31.59 | ||||||||||||
1960 | 18.39 | 21.86 | 27.63 | a | 30.80 | 33.55 | 38.40 | 46.26 | 40.81 | 37.67 | 34.35 | 24.13 | 24.58 | 31.54 | ||||||||||||
1961 | 26.84 | 28.69 | b | 25.65 | 29.14 | b | 31.48 | 43.37 | 44.03 | 45.61 | 32.37 | 29.48 | 22.57 | 22.97 | a | 31.85 | ||||||||||
1962 | 18.55 | b | 24.86 | 23.58 | 27.71 | b | 31.23 | 36.13 | 39.10 | b | 41.80 | a | 38.40 | 33.59 | b | 30.44 | c | 26.36 | f | 31.40 | a | |||||
1963 | 13.78 | d | 31.39 | e | 26.11 | d | 28.52 | c | 33.68 | c | 36.85 | c | 37.16 | f | 39.23 | a | 42.43 | b | 32.77 | 29.00 | 22.68 | 30.59 | a | |||
1964 | 22.87 | a | 19.36 | a | 16.19 | d | 21.59 | a | 26.61 | c | ----- | z | 42.28 | b | 38.30 | d | 33.36 | b | 30.17 | a | 25.62 | a | 20.24 | f | 27.63 | b |
1965 | 26.07 | c | 23.84 | i | ----- | z | 29.68 | b | 29.52 | 36.93 | 42.69 | b | 43.38 | b | 31.79 | b | 35.17 | b | 31.79 | a | 23.03 | 33.01 | b | |||
1966 | 27.31 | b | 23.89 | 24.80 | a | 23.93 | c | 31.10 | 38.20 | 40.97 | b | 40.03 | b | 40.56 | c | 31.20 | a | 32.12 | d | 26.67 | a | 31.73 | ||||
1967 | 26.97 | b | 26.11 | a | 23.73 | a | 25.33 | c | 32.90 | 39.83 | 43.54 | c | 46.67 | a | 42.73 | 34.84 | 27.93 | a | 21.77 | 32.70 | ||||||
1968 | 23.00 | 28.83 | 28.16 | 25.14 | a | 34.52 | b | 39.46 | b | 43.61 | 44.37 | a | 38.79 | b | 32.17 | a | 29.17 | a | 18.63 | d | 32.15 | |||||
1969 | 13.07 | b | 20.04 | 23.32 | 28.59 | a | 37.70 | a | 44.63 | 42.61 | c | 40.30 | a | 39.25 | b | 30.35 | 27.66 | a | 24.30 | a | 30.98 | |||||
1970 | 24.32 | 26.12 | b | 25.04 | d | 23.63 | 32.52 | 43.21 | b | 43.13 | 40.45 | b | 33.13 | 29.67 | a | 27.69 | a | 22.32 | 30.94 | |||||||
1971 | 24.90 | 23.96 | a | 25.10 | a | 26.03 | a | 34.10 | a | 37.60 | 45.13 | 46.84 | 34.86 | a | 28.21 | b | 27.00 | a | 21.17 | b | 31.24 | |||||
1972 | 21.03 | 25.90 | 29.90 | 25.69 | a | 35.74 | 41.33 | 44.66 | b | 43.86 | c | 34.23 | 29.48 | 29.44 | c | 14.25 | c | 31.29 | ||||||||
1973 | 20.07 | a | 26.56 | a | 25.77 | a | 27.52 | a | 35.42 | 39.72 | e | 42.52 | b | 41.67 | a | 40.31 | d | 31.54 | c | 27.59 | a | 28.45 | 32.26 | |||
1974 | 17.32 | 25.73 | b | 26.54 | c | 28.39 | b | 31.97 | a | 41.40 | e | 41.55 | b | 42.52 | 35.80 | 30.10 | 28.93 | b | 24.00 | 31.19 | ||||||
1975 | 24.23 | a | 22.50 | 22.64 | c | 24.97 | 30.46 | c | 37.32 | e | 47.52 | b | 40.45 | b | 36.59 | a | 35.97 | b | 27.00 | b | 26.83 | b | 31.37 | |||
1976 | 25.63 | a | 22.79 | 24.03 | 27.48 | a | 30.54 | c | 32.70 | c | 40.14 | c | 43.83 | b | 37.69 | a | 26.60 | f | 29.08 | d | 19.43 | a | 30.30 | a | ||
1977 | 15.04 | d | 22.82 | 22.17 | g | 24.64 | b | 31.81 | d | 39.93 | b | 41.82 | c | 48.36 | c | 36.35 | d | 31.83 | b | 25.36 | b | 27.44 | d | 31.40 | a | |
1978 | ----- | z | ----- | z | ----- | z | 29.96 | d | 31.70 | a | 39.32 | b | 43.41 | d | 43.59 | d | 38.56 | e | 28.63 | d | ----- | z | ----- | z | 36.45 | e |
1979 | 2.86 | c | 25.48 | e | 27.40 | a | 29.46 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.33 | a | 24.96 | c | 27.43 | a | 24.85 | e |
1980 | 18.27 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.62 | g | 30.30 | 29.94 | 26.17 | i | ||
1981 | 24.72 | b | 24.74 | a | 27.10 | a | 27.22 | g | 32.53 | l | 38.03 | a | 37.15 | d | ----- | z | 34.70 | g | ----- | z | ----- | z | ----- | z | 30.35 | g |
1982 | 17.45 | k | 22.04 | c | 25.85 | d | 24.81 | i | 32.93 | b | 43.27 | d | 43.61 | c | 41.72 | f | 34.81 | i | 29.25 | k | 21.56 | e | 22.12 | g | 31.54 | f |
1983 | 27.17 | g | 28.65 | h | 31.88 | n | 26.78 | c | 35.48 | d | 36.35 | g | 41.12 | e | 45.33 | g | 34.46 | q | 32.80 | f | 30.04 | b | 13.77 | e | 29.44 | g |
1984 | 24.35 | e | 25.95 | h | 29.72 | f | 26.89 | c | 32.74 | d | 36.38 | d | 41.50 | e | 41.57 | c | 32.96 | e | 29.73 | a | 27.83 | f | 18.28 | f | 33.27 | d |
1985 | 19.33 | j | 20.30 | e | 22.72 | b | ----- | z | 29.96 | e | 38.25 | f | 43.15 | e | 42.96 | d | 36.32 | e | 26.74 | d | 10.48 | c | 14.40 | f | 29.08 | d |
1986 | 30.63 | l | 26.85 | b | 30.71 | g | 26.74 | c | 33.00 | f | 42.15 | d | 40.29 | g | 42.30 | d | 36.48 | e | 31.77 | e | 28.78 | c | 24.63 | a | 32.46 | d |
1987 | ----- | z | 27.27 | b | 27.26 | h | 30.22 | g | 36.31 | e | 40.25 | b | 43.00 | c | 39.64 | f | 35.28 | e | 27.63 | d | 27.52 | e | 21.26 | d | 32.31 | d |
1988 | 22.83 | a | 23.77 | c | 26.24 | f | 31.73 | d | 30.92 | f | 39.43 | b | 41.14 | c | 38.83 | b | 31.70 | j | 35.73 | e | 30.18 | b | 22.40 | a | 31.78 | c |
1989 | 22.00 | c | 12.04 | c | 27.58 | e | 33.03 | 32.54 | e | 39.39 | b | 39.19 | d | 39.29 | c | 34.00 | b | 27.97 | a | 28.21 | b | 22.10 | b | 29.78 | ||
1990 | 25.93 | c | 22.04 | c | 26.61 | h | ----- | z | 29.93 | c | 37.97 | a | 43.76 | b | 45.64 | c | 39.44 | c | 29.87 | a | 27.92 | e | 11.29 | c | 31.38 | b |
1991 | 19.48 | d | ----- | z | ----- | z | ----- | z | 31.35 | h | 33.77 | 42.68 | c | 40.88 | g | 33.89 | c | 30.00 | c | 29.59 | c | 22.67 | d | 30.30 | e | |
1992 | 25.26 | d | 27.04 | f | 30.22 | h | 31.74 | c | ----- | z | 41.41 | a | ----- | z | 40.47 | a | 35.87 | o | 34.78 | d | 26.43 | b | 16.15 | e | 30.89 | e |
1993 | 11.81 | e | 13.86 | g | 30.10 | b | 32.83 | a | 40.05 | k | 38.48 | i | 36.58 | g | 37.59 | n | 35.90 | j | 32.00 | d | 11.52 | e | 24.86 | c | 23.85 | f |
1994 | 26.94 | 21.69 | b | 25.00 | a | 31.85 | c | 35.62 | e | 37.26 | c | 41.44 | d | 38.00 | b | 38.81 | c | 29.31 | b | 21.81 | c | 24.21 | b | 31.00 | ||
1995 | 26.06 | 27.88 | d | 25.45 | b | 28.14 | b | 34.50 | g | 40.24 | a | 44.61 | c | 38.57 | c | 39.03 | a | 30.07 | b | 32.54 | d | 22.72 | b | 32.30 | a | |
1996 | 24.16 | 20.28 | 27.00 | 31.17 | 31.90 | b | ----- | z | 43.71 | 42.62 | b | 34.31 | d | 29.74 | 26.83 | 25.45 | 30.65 | a | ||||||||
1997 | 23.42 | 24.11 | 27.43 | c | 28.19 | c | 34.14 | c | 35.26 | c | 40.59 | d | 44.11 | d | 39.10 | a | 29.43 | c | 29.97 | a | 21.80 | a | 31.46 | |||
1998 | 24.50 | a | 27.21 | 27.14 | b | 28.27 | 35.33 | a | 38.00 | b | 46.39 | 41.17 | a | 38.47 | 28.72 | b | 30.55 | a | 21.33 | a | 32.26 | |||||
1999 | 24.97 | 26.19 | a | 24.87 | 24.30 | c | 29.82 | c | 34.55 | a | 37.61 | c | 44.19 | d | 32.44 | c | 28.11 | d | 32.73 | 24.71 | 30.37 | |||||
2000 | 22.03 | 26.65 | c | 23.86 | b | 30.11 | b | 35.10 | b | 37.89 | b | 40.00 | c | 38.21 | c | 36.17 | 31.90 | 20.73 | 23.38 | b | 30.50 | |||||
2001 | 22.31 | b | 22.44 | a | 25.76 | b | 25.27 | 31.41 | b | 36.07 | a | 41.77 | 44.21 | b | 39.67 | 30.50 | a | 30.90 | a | 22.43 | a | 31.06 | ||||
2002 | 24.68 | 25.57 | g | 22.87 | 26.32 | b | 30.38 | b | 40.08 | d | 43.43 | c | 38.61 | c | 36.87 | o | 23.84 | 25.59 | a | 26.07 | a | 30.19 | b | |||
2003 | 30.48 | b | 22.86 | 30.23 | a | 29.36 | b | 32.77 | e | 37.74 | c | 43.57 | a | 42.48 | b | 39.00 | b | 34.03 | b | 23.07 | 24.94 | 32.54 | ||||
2004 | 24.16 | 26.50 | a | 28.23 | a | 28.50 | b | 34.34 | b | 36.56 | e | 42.28 | b | 45.45 | b | 36.75 | b | 32.63 | d | 28.13 | 27.97 | 32.63 | ||||
2005 | 24.16 | 21.04 | c | 26.90 | 30.96 | d | 38.59 | b | 35.77 | 41.96 | c | 39.97 | 31.97 | a | 32.16 | 26.67 | 19.16 | 30.78 | ||||||||
2006 | 27.73 | a | 18.11 | 24.06 | 28.55 | a | 30.20 | k | 40.72 | a | 43.28 | b | 38.22 | d | 33.56 | e | 27.97 | 27.55 | a | 23.10 | a | 30.26 | a | |||
2007 | 20.80 | a | 25.75 | 28.90 | 26.93 | 30.97 | a | 38.00 | a | 45.48 | b | 39.56 | d | 34.55 | a | 31.12 | e | 25.52 | a | 23.61 | 30.93 | |||||
2008 | 16.52 | f | 23.79 | a | 23.97 | b | 22.62 | a | 34.03 | b | 33.52 | a | 39.59 | d | 42.63 | d | 33.45 | a | 32.33 | a | 30.83 | a | 16.90 | a | 30.33 | a |
2009 | 21.45 | 23.67 | a | 22.93 | b | 24.50 | 33.45 | 40.17 | a | 42.85 | d | 42.21 | c | 38.62 | a | 31.25 | g | 27.48 | a | 20.82 | c | 30.74 | a | |||
2010 | 29.36 | c | 27.56 | a | 23.23 | a | 26.27 | d | 32.29 | 37.50 | 39.80 | a | 38.29 | 38.30 | 32.71 | 24.52 | a | 23.29 | 31.09 | |||||||
2011 | 22.73 | a | 18.29 | 27.47 | a | 24.97 | 29.52 | d | 35.44 | c | 37.28 | b | 39.10 | 38.03 | 30.97 | 21.43 | b | 20.19 | 28.78 | |||||||
2012 | 22.65 | 21.24 | 24.39 | 29.47 | 30.20 | a | 38.27 | 43.68 | 41.77 | 37.28 | a | 32.68 | 31.43 | 21.32 | 31.20 | |||||||||||
2013 | 19.94 | 23.32 | 25.74 | 25.77 | 34.06 | 39.20 | 42.81 | 44.79 | b | 40.97 | 27.32 | 23.90 | 17.71 | 30.46 | ||||||||||||
2014 | 21.90 | 17.29 | 23.71 | 26.73 | 31.61 | 37.17 | 45.71 | 45.48 | 38.57 | 34.97 | 22.20 | 23.55 | 30.74 | |||||||||||||
2015 | 27.90 | 26.04 | 27.58 | 24.57 | 34.74 | 41.97 | 44.29 | 42.77 | 34.10 | 35.65 | 21.23 | 22.23 | 31.92 | |||||||||||||
2016 | 25.55 | 27.62 | 26.90 | 30.97 | 35.23 | 38.53 | 40.03 | b | 41.45 | 35.23 | 35.42 | 33.97 | 13.42 | 32.03 | ||||||||||||
2017 | 13.00 | 25.21 | 31.10 | a | 28.79 | a | 32.33 | a | 37.38 | a | 42.61 | c | 44.35 | 40.17 | 30.48 | 28.87 | 17.65 | 31.00 | ||||||||
2018 | 27.32 | 20.29 | 23.87 | 28.70 | 36.40 | a | 36.17 | 41.81 | 42.29 | 33.21 | a | 30.90 | a | 25.17 | 24.23 | a | 30.86 | |||||||||
2019 | 25.71 | 16.46 | 19.41 | b | 31.13 | 33.83 | a | 34.57 | 41.77 | 44.65 | 40.70 | 29.32 | i | 24.03 | 27.39 | 30.88 | a | |||||||||
2020 | 27.48 | 22.76 | 21.87 | 28.07 | 34.16 | 39.10 | 41.42 | 44.68 | 39.50 | 31.55 | 28.43 | 25.81 | 32.07 | |||||||||||||
2021 | 26.29 | 22.19 | a | 23.74 | 25.23 | 32.97 | 45.10 | 46.39 | 43.65 | 39.10 | 33.45 | 32.93 | 21.84 | 32.74 | ||||||||||||
2022 | 26.55 | 20.96 | 28.68 | 25.83 | 31.77 | 39.47 | 44.35 | 47.00 | 40.10 | 32.94 | 21.20 | 18.35 | 31.43 | |||||||||||||
2023 | 24.29 | 22.79 | 22.35 | 29.73 | 37.35 | 38.00 | 43.81 | 47.45 | 39.90 | 33.48 | 28.60 | 30.35 | 33.18 | |||||||||||||
2024 | 22.48 | 25.79 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 24.14 | j | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 22.22 | 23.76 | 25.50 | 27.96 | 33.49 | 38.91 | 42.75 | 42.37 | 37.42 | 31.68 | 26.95 | 22.93 | 31.57 | |||||||||||||
S.D. | 5.72 | 3.53 | 2.72 | 2.51 | 2.68 | 2.73 | 2.29 | 2.73 | 2.83 | 2.80 | 4.23 | 4.23 | 1.22 | |||||||||||||
SKEW | -1.47 | -0.40 | -0.53 | -0.19 | 0.28 | 0.22 | -0.17 | 0.24 | -0.30 | -0.31 | -1.36 | -0.45 | 0.49 | |||||||||||||
MAX | 33.03 | 32.75 | 31.10 | 33.03 | 39.97 | 45.57 | 47.81 | 48.58 | 42.73 | 37.07 | 33.97 | 32.94 | 35.91 | |||||||||||||
MIN | 2.86 | 12.04 | 16.19 | 21.59 | 26.61 | 32.70 | 37.15 | 38.00 | 31.79 | 23.84 | 10.48 | 11.29 | 28.44 | |||||||||||||
YRS | 72 | 69 | 66 | 71 | 68 | 71 | 72 | 70 | 69 | 72 | 76 | 72 | 49 |