YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.33 | m | 39.90 | 33.05 | j | 26.76 | n | 23.68 | k | 16.55 | i | 39.90 | k | |
1934 | 21.19 | j | 11.06 | l | 22.00 | k | 27.58 | f | 37.05 | l | 38.15 | c | 41.10 | 37.94 | 31.81 | d | 29.33 | d | 29.20 | j | 16.40 | f | 35.66 | g | ||
1935 | 8.32 | c | 11.83 | p | ----- | z | 24.38 | n | 27.84 | l | 36.30 | 40.52 | 36.97 | 30.83 | 22.13 | 13.27 | 16.48 | b | 25.60 | d | ||||||
1936 | 10.21 | g | -17.44 | d | 14.81 | d | 20.84 | e | 35.71 | 41.77 | 41.84 | 37.29 | 31.97 | 23.71 | 8.83 | f | 14.79 | b | 24.53 | b | ||||||
1937 | -17.10 | a | 6.35 | e | 15.62 | r | 27.23 | 32.48 | 40.50 | 43.40 | a | 39.39 | 33.40 | 31.35 | 26.07 | a | 13.85 | e | 25.17 | a | ||||||
1938 | 9.74 | 7.00 | d | 20.41 | b | 24.68 | e | 33.90 | a | 41.76 | e | 44.97 | 37.29 | 36.55 | j | ----- | z | 20.00 | t | 15.29 | j | 27.47 | d | |||
1939 | 19.56 | m | 1.82 | k | 17.22 | v | 23.80 | y | ----- | 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 | ----- | z | 23.46 | q | 17.57 | a | 17.57 | k |
1946 | 16.26 | 16.82 | 27.75 | k | 26.29 | p | 31.18 | n | 40.33 | 40.87 | 38.35 | 35.23 | 24.75 | o | 14.07 | 8.68 | l | 28.85 | e | |||||||
1947 | 7.23 | 7.18 | k | 17.61 | 25.43 | p | 35.13 | 40.40 | 41.43 | a | 39.45 | 36.03 | 34.26 | 20.40 | 17.31 | e | 28.93 | b | ||||||||
1948 | 12.33 | m | 7.57 | f | 11.48 | f | 26.23 | 36.32 | 45.37 | 39.54 | e | 42.56 | f | 30.83 | f | 22.32 | 22.28 | a | 0.94 | 27.57 | e | |||||
1949 | -13.81 | 1.71 | 14.37 | a | 26.00 | 33.68 | c | 36.96 | d | 42.38 | b | 38.13 | 31.50 | 25.48 | 25.63 | 9.35 | 22.62 | |||||||||
1950 | -11.39 | 12.89 | a | 17.06 | 24.63 | 30.29 | 37.24 | a | 40.81 | 39.10 | 29.77 | 31.84 | 18.48 | a | 20.74 | 24.29 | ||||||||||
1951 | 3.45 | 7.22 | a | 7.90 | 19.50 | 32.55 | 34.86 | a | 40.58 | 38.81 | 32.97 | a | 29.84 | 17.97 | 1.39 | 22.25 | ||||||||||
1952 | 5.45 | 12.04 | a | 13.71 | 23.73 | 32.42 | 38.63 | 39.35 | 38.10 | 31.87 | 21.61 | 16.33 | 17.52 | 24.23 | ||||||||||||
1953 | 23.68 | 15.21 | 19.39 | 24.63 | 31.42 | 38.10 | 38.16 | 39.87 | 32.67 | 24.84 | 24.72 | a | 16.65 | 27.44 | ||||||||||||
1954 | 5.06 | 18.04 | 7.94 | 23.13 | 31.10 | 37.70 | 39.87 | 40.90 | 35.07 | a | 24.65 | 27.03 | 16.90 | a | 25.62 | |||||||||||
1955 | 13.40 | a | 7.46 | 7.71 | 25.13 | 30.81 | 36.50 | 43.43 | c | 33.41 | b | 30.93 | b | 30.65 | 10.80 | 5.68 | 22.99 | |||||||||
1956 | 10.68 | 5.38 | 17.03 | a | 22.48 | a | 32.97 | 38.13 | 42.04 | c | 39.21 | b | 32.76 | a | 28.44 | d | 17.13 | 11.87 | a | 24.84 | ||||||
1957 | -7.26 | 8.54 | 15.58 | 25.73 | 34.23 | 40.83 | 39.76 | b | 36.26 | 30.47 | 27.13 | 16.86 | a | 17.13 | a | 23.77 | ||||||||||
1958 | 15.61 | 18.11 | 13.97 | 27.17 | 34.30 | a | 41.83 | 42.73 | a | 41.52 | 34.38 | a | 24.61 | 17.27 | 15.77 | a | 27.27 | |||||||||
1959 | 9.52 | 5.64 | 21.03 | a | 25.47 | 29.45 | 39.17 | 38.69 | b | 37.90 | b | 37.38 | a | 29.60 | a | 10.10 | 10.14 | b | 24.51 | |||||||
1960 | 2.16 | 7.07 | a | 15.87 | a | 26.47 | 32.19 | 35.96 | b | 39.61 | 38.47 | a | 29.43 | 25.94 | 21.53 | 11.03 | 23.81 | |||||||||
1961 | 10.06 | 24.14 | 20.84 | 26.83 | 34.33 | a | 37.93 | a | 42.37 | a | 41.42 | 29.80 | 24.97 | 12.53 | 10.26 | 26.29 | ||||||||||
1962 | 0.72 | b | 10.04 | 13.70 | a | 26.48 | a | 33.26 | 34.97 | a | 39.43 | a | 38.26 | 29.14 | a | 31.23 | 27.17 | a | 22.58 | 25.58 | ||||||
1963 | -5.35 | 17.31 | b | 20.81 | 27.43 | 30.10 | b | 41.34 | a | 38.93 | b | 37.83 | b | 35.79 | b | 30.40 | a | 23.03 | a | 10.63 | a | 25.69 | ||||
1964 | 15.27 | a | 12.31 | 13.87 | a | 26.21 | a | 29.84 | 37.25 | b | 40.55 | b | 38.00 | a | 32.90 | a | 27.52 | b | 22.14 | b | 7.61 | 25.29 | ||||
1965 | 18.60 | a | 12.79 | 3.38 | b | ----- | z | 31.70 | a | 39.73 | 40.79 | b | 42.64 | c | 31.21 | b | 28.13 | a | 21.83 | a | 16.87 | a | 26.15 | a | ||
1966 | 12.00 | 11.54 | 16.10 | 25.57 | 33.00 | a | 37.48 | a | 40.17 | b | 37.69 | b | 34.66 | a | 27.16 | 19.82 | b | 18.52 | b | 26.14 | ||||||
1967 | 15.70 | a | 15.56 | a | 15.60 | a | 22.89 | b | 30.81 | 36.55 | a | 40.13 | 37.84 | 36.30 | 29.04 | e | ----- | z | 12.52 | 26.63 | a | |||||
1968 | ----- | z | ----- | z | ----- | z | ----- | z | 31.81 | 38.73 | 40.26 | 40.77 | 37.43 | 30.13 | p | 22.67 | 7.00 | 31.24 | e | |||||||
1969 | 0.42 | 9.64 | 16.39 | 28.18 | m | 32.21 | c | 40.67 | 38.10 | 34.06 | 35.13 | 23.96 | g | 29.30 | t | 18.67 | d | 25.03 | c | |||||||
1970 | 11.50 | a | 15.14 | 16.50 | g | 23.57 | p | 30.82 | t | 42.60 | ----- | z | 36.48 | 30.89 | b | 24.03 | 17.70 | 8.84 | 23.40 | d | ||||||
1971 | 9.61 | 15.54 | 16.77 | 25.33 | 33.10 | 38.27 | 39.33 | a | 41.90 | b | 29.93 | b | 21.85 | e | 21.57 | 5.90 | 24.92 | |||||||||
1972 | 0.42 | 14.33 | b | 23.71 | 24.23 | 31.97 | 40.88 | d | 40.89 | c | 41.93 | b | 33.11 | b | 23.41 | b | 21.83 | a | 6.13 | 25.24 | ||||||
1973 | 4.96 | c | 9.11 | 22.69 | e | 26.00 | a | 30.84 | 39.62 | a | 40.41 | b | 40.16 | f | 33.58 | d | 27.96 | e | 19.30 | 18.43 | c | 24.81 | a | |||
1974 | 9.27 | a | 18.93 | 18.35 | 28.83 | 33.57 | a | 39.92 | e | ----- | z | 40.57 | h | 29.73 | h | ----- | z | 21.30 | c | 17.06 | 23.40 | d | ||||
1975 | 5.90 | b | 4.58 | b | 12.85 | d | 18.28 | a | 30.26 | 37.93 | 45.88 | o | 40.90 | b | 31.24 | a | 28.74 | 17.28 | a | 13.31 | b | 21.93 | a | |||
1976 | 10.50 | a | 15.62 | 13.93 | b | 26.03 | 32.13 | 36.47 | 42.27 | a | 44.48 | 32.77 | 21.30 | a | 16.73 | 13.94 | 25.51 | |||||||||
1977 | 5.93 | a | 15.52 | a | 20.45 | b | 23.38 | a | 31.97 | 37.43 | b | 42.00 | a | 40.77 | 33.87 | 21.73 | a | 16.79 | a | 5.17 | a | 24.58 | ||||
1978 | 5.87 | a | 13.43 | 17.16 | 26.63 | 32.61 | 37.47 | 42.45 | 38.13 | 35.57 | b | 21.77 | 11.38 | a | -2.90 | b | 23.30 | |||||||||
1979 | -17.00 | b | 6.04 | a | 16.41 | b | 25.63 | 31.03 | 35.96 | f | 38.26 | 37.47 | a | ----- | z | 21.93 | c | 13.38 | a | 19.39 | 19.25 | b | ||||
1980 | ----- | z | 16.89 | b | 18.80 | f | 25.90 | 34.77 | 38.03 | a | 40.35 | 37.23 | a | 32.48 | a | 21.10 | 17.63 | 11.47 | a | 27.59 | b | |||||
1981 | 11.52 | 13.93 | 17.38 | b | 28.00 | 35.97 | 38.30 | 41.23 | 38.81 | 29.33 | 23.40 | a | 18.80 | 9.82 | c | 25.54 | ||||||||||
1982 | 3.20 | k | 3.93 | m | 17.74 | d | 19.57 | 28.87 | 39.80 | 40.81 | 38.13 | 30.69 | a | 25.23 | 16.97 | 7.72 | b | 26.55 | b | |||||||
1983 | 14.93 | a | 20.00 | 23.43 | a | 23.17 | 29.63 | a | 39.20 | 40.63 | a | 40.87 | a | 28.57 | 22.52 | 25.14 | a | -9.00 | a | 24.92 | ||||||
1984 | 13.29 | 16.24 | 23.53 | a | 25.80 | 31.23 | 37.33 | 39.10 | 39.13 | a | 29.83 | a | 21.48 | 18.03 | 2.38 | b | 24.78 | |||||||||
1985 | 5.83 | a | 0.00 | 10.32 | 25.43 | 31.37 | a | 35.72 | a | 38.77 | a | 37.38 | b | 30.83 | 24.16 | 0.87 | 6.27 | a | 20.58 | |||||||
1986 | 10.32 | 5.89 | 22.55 | 26.13 | 34.16 | 40.83 | 39.03 | 38.68 | 32.63 | 22.81 | 14.36 | b | 9.76 | b | 24.76 | |||||||||||
1987 | 3.97 | 7.70 | a | 20.16 | 25.93 | 32.94 | 37.63 | 42.32 | 36.03 | a | 27.96 | b | 16.75 | g | 20.10 | 7.90 | a | 23.88 | a | |||||||
1988 | 1.45 | 9.66 | 22.42 | 26.25 | b | 31.37 | a | 38.86 | a | 39.10 | a | 34.77 | a | 32.59 | a | 27.40 | a | 23.25 | b | 6.06 | 24.43 | |||||
1989 | 6.63 | a | -5.64 | c | 15.68 | 25.17 | a | 33.19 | 39.97 | 44.27 | a | 43.13 | 31.13 | 24.84 | 23.44 | c | 13.13 | a | 24.58 | |||||||
1990 | 12.42 | 3.25 | 14.00 | 25.53 | 33.39 | 38.67 | 40.63 | a | 42.03 | 30.50 | 27.42 | 21.38 | a | 3.52 | f | 26.29 | a | |||||||||
1991 | 1.93 | d | 14.56 | c | 12.13 | 25.40 | 33.77 | 39.45 | a | ----- | z | ----- | z | 28.57 | 16.21 | c | 16.14 | b | 9.10 | 19.73 | b | |||||
1992 | 11.28 | f | 14.69 | c | 20.57 | a | 26.86 | b | 32.55 | 42.28 | a | ----- | z | ----- | z | 30.07 | a | 26.40 | a | 20.67 | c | -2.45 | 23.51 | c | ||
1993 | -6.61 | c | -1.36 | c | 15.62 | b | 29.48 | a | 36.03 | 39.63 | 41.77 | a | 37.30 | a | 30.48 | a | 25.33 | d | 7.37 | c | 15.35 | e | 22.53 | |||
1994 | 14.77 | a | -1.27 | b | 15.00 | b | ----- | z | 33.37 | d | 37.27 | 39.94 | 37.07 | b | 27.14 | b | 24.38 | e | 11.72 | a | 9.53 | a | 22.63 | a | ||
1995 | 8.52 | 14.93 | 18.23 | 26.43 | 30.35 | 38.69 | a | 43.73 | a | 36.45 | 31.33 | 28.81 | 21.78 | c | 11.27 | a | 25.88 | |||||||||
1996 | 3.17 | b | 4.38 | 11.94 | 26.41 | a | 31.96 | e | 38.07 | c | 39.19 | 37.87 | 33.21 | a | 24.03 | 13.50 | d | 2.93 | d | 22.22 | ||||||
1997 | 6.05 | l | 10.09 | e | 14.81 | d | 17.43 | b | 31.90 | 37.80 | 39.55 | b | 37.23 | a | 33.72 | a | 28.43 | a | 15.93 | 10.69 | b | 25.24 | a | |||
1998 | 7.96 | g | 14.19 | a | 15.13 | 23.71 | b | 31.07 | a | 38.34 | a | 43.46 | c | 36.17 | b | 32.38 | d | 22.32 | c | 22.89 | b | 11.43 | c | 26.46 | a | |
1999 | 9.84 | 14.81 | b | 13.29 | c | 16.07 | 26.23 | 36.17 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 16.04 | g | |||
2000 | 10.93 | b | 10.86 | a | 19.26 | d | 20.00 | a | 27.32 | 35.03 | a | 35.22 | h | 33.00 | d | 30.31 | a | 19.86 | b | 11.44 | e | 3.52 | b | 20.14 | a | |
2001 | 10.20 | a | 3.37 | a | 14.71 | 24.36 | b | 28.38 | b | 34.63 | 35.04 | c | 34.08 | e | 30.12 | e | 23.87 | 23.27 | 13.50 | a | 22.96 | |||||
2002 | 12.26 | d | 5.76 | c | 5.97 | a | 22.93 | c | ----- | z | ----- | z | 50.10 | j | 49.42 | e | 49.03 | 49.25 | c | 48.10 | 30.67 | v | 30.34 | d | ||
2003 | 21.25 | w | 13.92 | c | 18.94 | 26.93 | 30.30 | a | 38.17 | 37.10 | a | 37.40 | a | 32.07 | a | 23.94 | 9.20 | 5.23 | a | 24.84 | a | |||||
2004 | 9.42 | 9.59 | 20.75 | g | 23.64 | b | 31.26 | 35.93 | b | 40.83 | b | 42.93 | d | 35.38 | d | 25.46 | c | 19.59 | a | 19.90 | 26.72 | a | ||||
2005 | 8.45 | b | 11.04 | 20.19 | 24.57 | b | 30.82 | c | 38.75 | b | 37.62 | g | 34.92 | f | 29.16 | e | 28.62 | g | 22.60 | 4.20 | a | 21.09 | c | |||
2006 | 23.80 | a | 3.85 | a | 16.65 | 27.60 | e | 31.15 | d | 35.80 | o | 40.40 | f | 33.54 | g | 30.54 | d | 24.22 | d | 18.96 | b | 8.00 | 20.53 | c | ||
2007 | 1.48 | 13.64 | 22.83 | b | 25.40 | 30.35 | 36.32 | b | 41.48 | b | 32.10 | a | 28.63 | 25.83 | b | 16.18 | b | 6.48 | 23.39 | |||||||
2008 | 2.00 | a | 14.18 | a | 15.42 | 20.07 | a | 30.77 | 34.00 | 37.30 | a | 37.00 | a | 29.14 | a | 21.71 | 20.38 | a | 5.92 | e | 22.32 | |||||
2009 | 5.93 | a | 6.11 | a | 16.12 | e | 24.19 | d | 29.97 | a | 34.32 | b | 39.80 | a | 42.14 | i | 27.13 | o | 25.36 | f | 23.50 | j | 6.79 | q | 22.35 | e |
2010 | 13.07 | b | 18.86 | 18.53 | p | 24.25 | f | 28.67 | a | 36.47 | 38.62 | b | 35.36 | c | 34.31 | a | 27.65 | 19.04 | b | 8.94 | 26.10 | b | ||||
2011 | 9.00 | 2.27 | b | 20.26 | 22.77 | 29.97 | 36.70 | 37.28 | b | 36.20 | a | 30.77 | 27.65 | 16.07 | 13.39 | 23.53 | ||||||||||
2012 | 12.45 | 9.79 | 21.93 | a | 27.24 | a | 29.06 | 38.38 | d | 42.15 | d | 35.21 | b | 27.60 | 25.83 | b | 24.26 | g | 21.32 | l | 26.97 | b | ||||
2013 | 8.00 | k | 14.21 | d | 16.27 | a | 21.17 | a | 29.68 | 37.23 | 38.03 | 40.35 | 36.83 | 21.16 | 15.37 | 6.55 | 25.17 | a | ||||||||
2014 | 10.39 | -2.15 | b | 16.65 | 22.60 | 28.84 | 35.57 | 40.61 | 39.48 | 29.03 | 28.19 | 11.45 | a | 11.03 | b | 22.64 | ||||||||||
2015 | 5.45 | 14.61 | 18.55 | 22.03 | 27.00 | 36.53 | 37.42 | 34.55 | 29.83 | 24.32 | 16.07 | 13.45 | 23.32 | |||||||||||||
2016 | 15.52 | 16.45 | 22.58 | 26.10 | 30.84 | 35.23 | 38.71 | 36.61 | 30.47 | 29.10 | 25.77 | 0.60 | a | 25.66 | ||||||||||||
2017 | -9.16 | 3.67 | a | 20.83 | a | 25.47 | 30.32 | 37.33 | u | 36.40 | a | 34.68 | 30.40 | j | 21.86 | c | 20.40 | 5.16 | 18.96 | b | ||||||
2018 | 15.23 | -3.04 | b | 12.68 | 20.77 | 33.74 | 34.77 | 37.06 | 34.35 | 27.73 | 20.71 | 16.23 | 14.97 | 22.10 | ||||||||||||
2019 | 9.77 | -5.82 | k | 15.08 | s | 25.00 | 29.16 | 36.27 | 37.94 | 37.74 | 35.53 | 21.50 | c | 14.70 | 17.87 | 26.55 | b | |||||||||
2020 | 14.29 | 7.93 | 12.65 | 18.77 | 31.43 | a | 38.23 | 36.19 | 34.39 | 30.17 | 23.66 | b | 19.67 | 12.13 | 23.29 | |||||||||||
2021 | 13.65 | 4.76 | c | 17.32 | 20.63 | 28.97 | 37.21 | a | 39.35 | 40.13 | 30.37 | 20.68 | 21.73 | 5.84 | 23.39 | |||||||||||
2022 | 3.60 | a | 6.92 | b | 20.10 | 18.86 | a | 29.14 | b | 37.27 | 40.42 | 39.32 | 30.30 | 25.45 | 5.93 | 6.24 | n | 23.39 | a | |||||||
2023 | 17.31 | b | 18.00 | s | 10.00 | m | 21.24 | a | 35.38 | e | 38.10 | a | 37.33 | a | 37.86 | b | 32.81 | d | 24.03 | b | 16.57 | 17.90 | 27.85 | b | ||
2024 | 10.57 | c | 13.90 | 13.75 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 12.74 | i | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 7.30 | 9.83 | 16.60 | 24.30 | 31.67 | 38.16 | 40.14 | 38.26 | 32.04 | 25.56 | 18.47 | 10.57 | 24.26 | |||||||||||||
S.D. | 8.28 | 6.84 | 4.27 | 2.82 | 2.15 | 2.15 | 2.00 | 2.84 | 3.16 | 4.37 | 6.13 | 6.15 | 1.49 | |||||||||||||
SKEW | -1.01 | -1.00 | -0.61 | -0.88 | 0.01 | 0.53 | -0.02 | 0.75 | 2.15 | 2.17 | 1.01 | -0.48 | -0.08 | |||||||||||||
MAX | 23.80 | 24.14 | 23.71 | 29.48 | 36.32 | 45.37 | 44.97 | 49.42 | 49.03 | 49.25 | 48.10 | 22.58 | 27.44 | |||||||||||||
MIN | -17.10 | -17.44 | 3.38 | 16.07 | 26.23 | 34.00 | 35.04 | 32.10 | 27.14 | 16.21 | 0.87 | -9.00 | 20.58 | |||||||||||||
YRS | 73 | 76 | 72 | 73 | 78 | 78 | 73 | 75 | 76 | 74 | 75 | 75 | 42 |