YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1929 | -12.83 | a | -7.86 | 23.71 | 31.80 | 37.42 | 49.27 | 56.84 | 53.74 | 42.67 | 33.90 | b | 17.00 | 5.81 | 27.62 | |||||||||||
1930 | -7.03 | 17.50 | 20.65 | 34.20 | 40.94 | 52.03 | 58.13 | 57.19 | 43.20 | 33.55 | 20.70 | 13.04 | d | 32.01 | ||||||||||||
1931 | 13.71 | 19.68 | 18.68 | 30.93 | 39.81 | 57.20 | 58.10 | 54.94 | 49.67 | 36.74 | 21.53 | 10.77 | 34.31 | |||||||||||||
1932 | -0.32 | 5.54 | a | 12.16 | 34.53 | 44.10 | 56.53 | 57.06 | 55.61 | 42.30 | 30.97 | 16.97 | 1.61 | 29.76 | ||||||||||||
1933 | 3.29 | -0.61 | 19.00 | 30.13 | 44.16 | 58.60 | 58.48 | 54.03 | 48.50 | 28.94 | 18.73 | 0.19 | 30.29 | |||||||||||||
1934 | 7.26 | 8.36 | 13.60 | a | 30.90 | 49.10 | 54.47 | 59.20 | a | 53.39 | 41.43 | 38.16 | 24.07 | 4.97 | a | 32.07 | ||||||||||
1935 | -4.19 | 18.32 | 21.16 | 31.27 | 40.03 | 50.28 | a | 63.81 | 55.87 | 44.10 | 29.03 | 9.29 | b | 2.97 | 30.16 | |||||||||||
1936 | -16.61 | -20.00 | 19.23 | 24.63 | 46.97 | 53.87 | 64.94 | 59.45 | 48.43 | 27.84 | 17.60 | 8.07 | a | 27.87 | ||||||||||||
1937 | -16.23 | -3.61 | 16.65 | 30.70 | 45.31 | b | 51.60 | 59.26 | 59.55 | 44.20 | 29.79 | c | 12.25 | b | -1.33 | a | 27.34 | |||||||||
1938 | -4.10 | ----- | z | ----- | z | 30.14 | b | 41.86 | c | 52.79 | b | 57.19 | 56.84 | 45.60 | 36.93 | b | 13.87 | 10.58 | 34.17 | b | ||||||
1939 | 5.39 | -9.18 | 14.71 | 27.03 | a | 46.42 | 52.37 | 58.52 | 52.93 | c | 41.57 | 31.93 | c | 18.70 | 15.03 | 29.62 | ||||||||||
1940 | -7.35 | 6.69 | 17.77 | 27.90 | 39.94 | 50.66 | a | 58.87 | 55.84 | 48.72 | a | 38.74 | 16.60 | 11.90 | 30.52 | |||||||||||
1941 | 2.32 | 1.82 | 16.00 | 36.07 | 47.03 | 55.43 | 59.35 | 55.73 | a | 44.80 | 32.73 | a | 20.87 | 13.16 | 32.11 | |||||||||||
1942 | 6.32 | 5.75 | 21.61 | 30.67 | 38.00 | 50.60 | 54.65 | 54.52 | 40.87 | 30.61 | 20.00 | 2.26 | 29.65 | |||||||||||||
1943 | -10.45 | 1.86 | 6.94 | 30.13 | 36.74 | 52.37 | 59.74 | 54.87 | 40.03 | 32.03 | 19.33 | 7.23 | a | 27.57 | ||||||||||||
1944 | 7.94 | -2.69 | 8.30 | a | 26.73 | 46.26 | 53.17 | 56.03 | 53.87 | a | 44.63 | 33.23 | 25.70 | 9.03 | 30.18 | |||||||||||
1945 | 6.13 | 1.11 | a | 23.68 | 27.33 | 36.19 | 48.43 | 55.61 | 54.71 | 42.37 | 29.68 | c | 15.72 | a | -2.26 | 28.23 | ||||||||||
1946 | -2.83 | a | -4.75 | 25.77 | 35.43 | 39.19 | 52.93 | 59.68 | 53.39 | 44.90 | 31.74 | 15.73 | 5.13 | 29.69 | ||||||||||||
1947 | 5.48 | -0.43 | 14.71 | 29.40 | 37.68 | 51.10 | 58.23 | 60.58 | 43.97 | 39.00 | 14.27 | 2.35 | 29.69 | |||||||||||||
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 60.90 | a | 56.81 | 48.90 | 31.55 | 20.67 | 3.37 | a | 37.03 | f | ||||
1949 | -5.58 | -9.36 | 14.84 | 31.80 | 43.87 | a | 53.90 | 59.03 | 58.39 | 40.17 | 32.39 | 23.53 | 0.58 | 28.63 | ||||||||||||
1950 | -16.84 | -4.86 | 12.45 | 25.27 | 40.71 | 51.10 | 54.94 | 51.97 | 46.37 | 33.29 | 10.80 | -1.00 | 25.35 | |||||||||||||
1951 | -9.06 | 2.82 | 4.13 | 28.20 | 43.55 | 47.53 | 56.19 | 54.52 | 41.90 | 32.03 | 11.27 | -3.23 | a | 25.82 | ||||||||||||
1952 | -8.74 | 6.21 | 10.03 | 33.67 | 42.35 | 54.67 | 57.03 | 54.23 | 46.47 | 25.23 | 17.87 | 6.71 | 28.81 | |||||||||||||
1953 | -0.87 | 6.57 | 17.32 | 27.23 | 42.61 | 55.50 | 58.16 | 59.00 | 43.97 | 36.97 | 23.47 | 5.97 | 31.32 | |||||||||||||
1954 | -11.81 | 20.75 | 14.23 | 28.40 | 39.06 | 53.73 | 60.19 | 56.29 | 47.03 | 32.87 | 22.17 | 8.77 | 30.97 | |||||||||||||
1955 | -0.26 | -4.89 | 8.81 | 36.13 | 47.97 | 53.17 | 63.16 | 60.13 | 44.33 | 31.35 | 7.33 | -5.68 | 28.46 | |||||||||||||
1956 | -3.03 | -6.93 | 9.74 | 25.47 | 43.42 | 58.10 | 57.19 | 56.19 | 42.33 | 33.42 | 19.03 | 10.03 | 28.75 | |||||||||||||
1957 | -9.16 | 1.39 | 16.87 | a | 29.90 | 42.48 | 51.03 | 63.35 | 57.71 | 43.00 | 36.39 | 20.93 | 10.74 | 30.39 | ||||||||||||
1958 | 6.06 | -0.14 | 20.52 | 30.73 | 42.97 | 48.37 | 55.26 | 55.52 | 45.80 | 32.74 | 18.87 | 0.58 | 29.77 | |||||||||||||
1959 | -5.55 | -8.32 | 20.00 | 28.33 | 42.94 | 56.13 | 57.94 | 58.68 | 45.43 | 28.39 | 12.17 | a | 18.90 | 29.59 | ||||||||||||
1960 | 1.39 | 1.79 | 5.45 | 31.43 | 42.23 | 52.33 | 59.00 | 58.48 | 47.33 | 34.45 | 18.73 | 0.03 | 29.39 | |||||||||||||
1961 | -2.48 | 7.18 | 23.68 | 26.80 | 39.48 | 53.50 | 56.77 | 58.48 | 43.60 | 33.29 | 18.00 | -1.48 | 29.74 | |||||||||||||
1962 | -5.23 | 0.75 | 12.97 | 29.70 | 46.45 | 54.97 | 57.35 | 57.23 | 42.97 | a | 36.00 | 22.97 | a | 7.16 | 30.27 | |||||||||||
1963 | -8.52 | -1.21 | 17.13 | 32.70 | 42.48 | 58.83 | 60.29 | 57.61 | 49.00 | 40.81 | 21.40 | -2.94 | 30.63 | |||||||||||||
1964 | 2.67 | a | 6.97 | 6.94 | 32.47 | 44.74 | 53.87 | 61.19 | 54.39 | 42.10 | 30.42 | 15.27 | -5.45 | 28.80 | ||||||||||||
1965 | -11.40 | a | -6.14 | 6.48 | 32.10 | 43.32 | 53.10 | 58.94 | 55.13 | 39.00 | 34.77 | 15.87 | 12.68 | 27.82 | ||||||||||||
1966 | -13.90 | -4.36 | 20.39 | 28.00 | 39.19 | 53.17 | 62.00 | 54.83 | a | 45.73 | 30.32 | 11.60 | 4.03 | 27.58 | ||||||||||||
1967 | -1.19 | -7.14 | 17.00 | 27.77 | 37.48 | 51.43 | 54.32 | 51.35 | 44.90 | 31.06 | 18.30 | 4.42 | 27.48 | |||||||||||||
1968 | -4.48 | 0.59 | 20.23 | 30.43 | 39.10 | 53.37 | 56.74 | 52.74 | 44.67 | 33.48 | 21.90 | 1.23 | 29.17 | |||||||||||||
1969 | -9.71 | 4.96 | 3.58 | 33.63 | 43.94 | 46.93 | 57.74 | 57.71 | 46.57 | 30.06 | 21.07 | 8.45 | 28.74 | |||||||||||||
1970 | -10.13 | a | -0.64 | 9.23 | 29.50 | 41.26 | 56.30 | 59.35 | 56.16 | 45.77 | 32.87 | 18.77 | -0.58 | 28.15 | ||||||||||||
1971 | -8.35 | 0.36 | 17.32 | 30.93 | 39.29 | 56.07 | 53.81 | 54.74 | 44.55 | a | 36.23 | 19.00 | -0.55 | 28.62 | ||||||||||||
1972 | -9.97 | -5.54 | a | 14.97 | 31.20 | 47.65 | 52.63 | 56.10 | 56.84 | 43.07 | 28.58 | 19.83 | -4.30 | a | 27.59 | |||||||||||
1973 | 2.26 | 6.75 | 27.65 | 30.83 | 41.42 | 52.80 | 57.23 | 59.58 | 43.63 | 38.47 | a | 16.63 | 3.16 | 31.70 | ||||||||||||
1974 | -6.61 | 0.25 | 15.52 | 31.17 | 41.65 | 50.83 | 61.74 | 52.67 | a | 40.46 | b | 31.97 | 19.60 | 8.73 | i | 30.84 | a | |||||||||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | 40.23 | a | 53.63 | 56.58 | 56.67 | a | 40.12 | d | 25.16 | 10.33 | -3.52 | 34.90 | d | |||||
1977 | -13.90 | 8.43 | 21.20 | a | 35.33 | 51.53 | a | 54.47 | 58.84 | 51.33 | a | 45.27 | 30.41 | d | 15.73 | -1.90 | a | 29.73 | ||||||||
1978 | -13.92 | e | -3.63 | a | 10.29 | g | 31.10 | 45.53 | a | 52.14 | b | 57.45 | 55.35 | 49.55 | a | 31.29 | 9.63 | -1.80 | a | 28.43 | a | |||||
1979 | -13.87 | -12.71 | 11.47 | a | 27.60 | 37.77 | 52.17 | a | 58.47 | a | 54.45 | 45.00 | 29.32 | 17.83 | 11.48 | 26.58 | ||||||||||
1980 | -1.97 | 1.07 | 11.58 | 33.03 | 44.23 | 53.77 | 56.61 | h | 54.23 | a | 44.34 | a | 32.52 | 23.73 | 4.94 | 27.41 | a | |||||||||
1981 | 2.47 | a | 8.96 | 19.97 | a | 34.07 | 41.81 | 51.50 | 59.81 | 56.81 | 44.07 | 34.16 | 24.30 | 0.68 | 31.55 | |||||||||||
1982 | -18.38 | e | -0.64 | c | 16.25 | c | 26.36 | b | 45.94 | 47.90 | a | 57.36 | c | 54.20 | a | 44.12 | e | 34.16 | f | 16.04 | c | 13.04 | d | 27.47 | a | |
1983 | 8.04 | e | 16.50 | f | 22.93 | b | 29.04 | b | 38.21 | c | 52.59 | a | 61.97 | b | 61.43 | a | 45.44 | c | 33.48 | f | 23.21 | f | ----- | z | 39.96 | d |
1984 | -0.52 | h | 16.08 | d | 11.92 | g | 32.79 | a | 39.11 | d | 50.72 | a | 57.10 | a | 57.00 | c | 39.77 | d | 37.04 | e | 16.42 | d | -2.00 | f | 38.45 | c |
1985 | -12.00 | l | -6.83 | e | 25.92 | e | 32.07 | 45.74 | 48.11 | b | 54.79 | b | 51.04 | d | 46.28 | e | 31.52 | h | -0.29 | f | -7.10 | j | 37.14 | d | ||
1986 | 2.21 | g | 0.87 | e | 22.20 | a | 31.43 | 45.93 | b | 54.25 | b | 58.00 | b | 51.00 | b | 43.52 | i | 32.27 | i | 9.82 | h | 8.19 | d | 33.98 | d | |
1987 | 8.62 | g | 17.24 | c | 21.96 | d | 32.60 | 47.44 | d | 54.28 | a | 60.53 | a | 52.31 | b | 43.43 | g | 29.73 | e | 21.74 | g | 14.27 | e | 36.71 | c | |
1988 | -3.75 | g | -0.58 | j | 18.23 | e | 24.81 | c | 44.04 | d | 57.48 | c | 55.48 | h | 54.04 | h | 41.62 | d | 26.65 | 16.11 | b | 8.18 | c | 29.64 | d | |
1989 | -0.93 | a | -8.36 | 9.20 | a | 30.97 | 41.35 | 50.33 | 60.90 | 54.73 | a | 44.17 | 30.94 | 12.97 | -5.55 | 26.73 | ||||||||||
1990 | 11.77 | 6.57 | 20.71 | 28.52 | a | 39.68 | 52.60 | 55.03 | 54.58 | 46.67 | 27.77 | 20.40 | -1.60 | a | 30.23 | |||||||||||
1991 | -3.33 | a | 11.43 | 19.03 | 32.27 | 48.32 | 57.86 | a | 56.32 | 56.71 | 44.93 | 28.61 | 12.37 | 8.26 | 31.07 | |||||||||||
1992 | 6.94 | 16.39 | a | 22.67 | a | 27.52 | a | 42.30 | a | 49.97 | a | 52.21 | b | 49.90 | a | 39.62 | a | 30.29 | 21.20 | 1.29 | 30.02 | |||||
1993 | -8.35 | -1.12 | b | 14.23 | 28.79 | b | 39.61 | 48.90 | a | 53.97 | a | 55.13 | a | 39.40 | 28.70 | a | 14.72 | a | 4.83 | b | 26.57 | |||||
1994 | -14.35 | -9.33 | a | 19.16 | 29.66 | a | 45.17 | b | 53.37 | 54.10 | b | 51.52 | b | 47.32 | b | 36.10 | a | 20.67 | c | 6.65 | 28.34 | |||||
1995 | 2.40 | a | 3.67 | a | 15.55 | 29.07 | a | 41.42 | 56.17 | 58.55 | 57.80 | a | 42.43 | 33.10 | a | 14.82 | b | 5.13 | a | 30.01 | ||||||
1996 | -10.30 | a | 1.46 | c | 9.19 | 27.30 | 41.47 | a | 52.48 | a | 53.97 | a | 54.16 | 46.63 | 31.03 | 6.73 | -3.46 | c | 25.89 | |||||||
1997 | -7.83 | a | 0.89 | a | 11.83 | b | 26.07 | 39.84 | 54.87 | 59.48 | 53.90 | b | 47.48 | a | 34.93 | c | 14.93 | b | 16.26 | 29.39 | ||||||
1998 | 1.43 | a | 20.00 | a | 15.83 | a | 34.00 | 47.16 | 50.96 | b | 58.77 | 58.00 | a | 48.93 | a | 35.80 | a | 23.69 | a | 11.53 | a | 33.84 | ||||
1999 | -4.72 | b | 12.92 | b | 22.67 | a | 32.83 | 45.23 | a | 53.60 | 59.87 | 56.43 | a | 44.60 | 31.35 | 24.10 | ----- | z | 34.44 | a | ||||||
2000 | 0.46 | e | 15.27 | c | 24.23 | e | 30.93 | b | 44.26 | 53.92 | e | 58.96 | d | 57.00 | d | 42.18 | b | 35.93 | b | 15.26 | c | -5.93 | a | 31.04 | ||
2001 | 5.00 | c | -6.37 | a | 14.17 | b | 31.52 | a | 45.19 | d | 54.54 | b | 61.83 | a | 56.48 | 46.55 | a | 30.42 | 28.69 | q | ----- | z | 33.93 | b | ||
2002 | ----- | z | ----- | z | ----- | z | 29.63 | 37.84 | 57.24 | a | 60.43 | j | 55.81 | d | 47.71 | b | 26.69 | b | 22.86 | w | ----- | z | 42.49 | f | ||
2003 | ----- | z | ----- | z | ----- | z | ----- | z | 43.74 | 54.83 | a | 57.65 | e | 53.12 | w | 42.86 | a | 34.28 | b | 19.05 | k | ----- | z | 46.67 | g | |
2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.57 | i | 54.93 | c | 49.76 | j | 50.61 | b | 34.27 | t | ----- | z | ----- | z | 52.77 | j |
2005 | ----- | z | ----- | z | ----- | z | 33.14 | a | 42.23 | 56.33 | c | 60.48 | d | 55.67 | a | 48.63 | 32.84 | ----- | z | ----- | z | 47.05 | e | |||
2006 | ----- | z | ----- | z | ----- | z | 34.87 | 43.97 | a | 52.80 | j | 60.29 | c | 56.00 | 44.20 | 28.47 | a | 16.63 | 10.71 | 36.89 | d | |||||
2007 | -1.03 | a | -4.70 | a | 31.64 | t | 28.73 | 46.32 | 57.93 | 60.97 | 54.96 | c | 45.34 | a | 37.87 | 19.76 | a | ----- | z | 34.62 | b | |||||
2008 | ----- | z | ----- | z | ----- | z | ----- | z | 37.72 | b | 51.37 | 59.52 | d | 57.10 | a | 43.83 | 33.35 | 26.44 | n | ----- | z | 47.15 | f | |||
2009 | ----- | z | ----- | z | ----- | z | 31.46 | f | 40.86 | j | 50.21 | f | 55.11 | l | 54.25 | k | 44.64 | s | 32.08 | e | 23.70 | g | 1.04 | c | 16.56 | j |
2010 | -0.71 | j | -3.33 | g | 22.70 | a | 35.48 | e | 45.38 | b | 53.13 | g | 58.48 | b | 58.96 | g | 43.59 | a | 36.13 | 17.77 | 0.10 | j | 37.07 | e | ||
2011 | -3.93 | d | -2.19 | g | 7.33 | m | 32.00 | h | 41.50 | c | 53.17 | g | 62.58 | e | 59.04 | g | 44.62 | f | 37.90 | a | 18.56 | c | 12.18 | c | 28.13 | f |
2012 | 8.35 | e | 8.50 | g | 26.72 | b | 33.22 | g | 44.97 | b | 54.00 | d | 62.52 | 51.65 | k | 40.07 | c | 30.32 | f | 22.75 | r | 0.14 | q | 39.44 | f | |
2013 | -0.82 | c | -0.48 | e | 5.15 | d | 19.56 | c | 43.78 | d | 53.70 | g | 57.41 | d | 53.83 | h | 49.97 | 35.71 | g | 12.71 | m | -1.52 | b | 21.63 | d | |
2014 | -6.63 | d | -5.54 | d | 13.54 | c | 25.65 | g | 43.04 | e | 54.00 | d | 56.04 | c | 57.61 | c | 46.62 | d | 35.50 | c | 10.58 | f | 12.31 | b | 30.65 | b |
2015 | 6.71 | g | -4.40 | c | 20.04 | e | 29.13 | g | 41.93 | d | 55.08 | d | 59.39 | c | 53.43 | c | 49.38 | a | 35.93 | c | 24.44 | e | 13.96 | d | 34.92 | b |
2016 | 6.04 | f | 14.50 | k | 24.54 | c | 31.85 | c | 44.52 | d | 49.00 | g | 56.24 | n | 56.26 | 49.10 | a | 33.54 | c | 27.97 | 4.39 | c | 34.02 | d | ||
2017 | 7.89 | d | 13.85 | a | 16.20 | a | 29.50 | 40.97 | a | 52.32 | b | 56.97 | 53.29 | 47.11 | b | 33.32 | i | 16.57 | b | 6.03 | b | 30.97 | a | |||
2018 | 1.27 | e | -6.79 | d | 15.48 | d | 20.00 | b | 46.90 | a | 57.37 | c | 59.19 | j | 54.93 | b | 46.43 | b | 28.96 | g | 10.11 | k | 14.50 | u | 29.45 | d |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | 41.35 | e | 53.90 | a | 60.37 | d | 55.61 | c | ----- | z | ----- | z | ----- | z | ----- | z | 52.81 | h |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | -3.37 | 1.77 | 16.48 | 30.20 | 42.68 | 53.22 | 58.36 | 55.58 | 44.74 | 32.63 | 17.83 | 4.76 | 29.35 | |||||||||||||
S.D. | 7.63 | 8.63 | 5.84 | 3.22 | 3.23 | 2.69 | 2.54 | 2.35 | 2.83 | 3.37 | 4.42 | 6.13 | 1.86 | |||||||||||||
SKEW | 0.07 | 0.40 | -0.31 | -0.70 | 0.13 | -0.09 | 0.11 | 0.02 | -0.01 | 0.09 | -0.31 | 0.13 | 0.18 | |||||||||||||
MAX | 13.71 | 20.75 | 27.65 | 36.13 | 51.53 | 58.83 | 64.94 | 61.43 | 50.61 | 40.81 | 27.97 | 18.90 | 34.31 | |||||||||||||
MIN | -18.38 | -20.00 | 3.58 | 19.56 | 36.19 | 46.93 | 52.21 | 49.90 | 39.00 | 25.16 | 6.73 | -5.93 | 25.35 | |||||||||||||
YRS | 72 | 73 | 75 | 79 | 87 | 82 | 84 | 82 | 85 | 80 | 74 | 74 | 57 |