YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 53.83 | a | 62.43 | 67.48 | a | 69.02 | 58.85 | 32.79 | 28.47 | a | 14.38 | a | 48.41 | d | ||||
1926 | 14.47 | 19.96 | 25.67 | e | 42.62 | d | 60.88 | n | 60.67 | f | 70.42 | k | 68.88 | n | 53.67 | r | 39.89 | l | 19.28 | 7.77 | 21.63 | f | ||||
1927 | 8.52 | 11.29 | 29.40 | 40.57 | 47.71 | 62.08 | 65.18 | 63.71 | 57.33 | 46.21 | 19.82 | -0.84 | 37.58 | |||||||||||||
1928 | 10.92 | 17.90 | 24.89 | 36.27 | 58.15 | 58.72 | 67.79 | 65.34 | 53.13 | 41.87 | 31.29 | f | 19.87 | 41.35 | a | |||||||||||
1929 | -6.44 | 1.89 | 29.24 | 41.25 | 48.69 | 61.33 | 69.74 | 68.94 | 52.73 | 45.68 | 20.30 | 7.82 | 36.77 | |||||||||||||
1930 | -3.74 | 19.25 | 24.90 | 45.75 | 50.90 | 63.22 | 72.11 | 71.00 | 57.00 | 39.87 | 27.85 | 16.40 | 40.38 | |||||||||||||
1931 | 16.68 | 24.89 | 24.97 | 42.60 | 51.00 | 67.12 | 70.52 | 65.79 | 61.28 | a | 47.79 | 29.60 | 18.02 | 43.35 | ||||||||||||
1932 | 7.44 | 10.31 | 16.24 | 41.37 | 54.79 | 66.85 | 69.34 | 68.76 | 56.95 | 37.68 | 21.97 | 10.94 | 38.55 | |||||||||||||
1933 | 9.29 | 6.21 | 25.87 | 38.43 | 54.84 | 70.22 | 70.77 | 68.92 | 60.70 | 39.39 | 23.92 | 3.79 | 39.36 | |||||||||||||
1934 | 11.68 | 13.48 | 23.50 | 41.55 | 62.03 | 63.17 | 70.74 | 65.97 | 52.00 | 47.50 | 31.37 | 9.35 | 41.03 | |||||||||||||
1935 | -1.53 | 21.91 | 24.13 | 36.88 | 49.53 | 59.07 | 72.92 | 64.80 | a | 55.80 | 42.92 | a | 14.57 | 8.47 | 37.46 | |||||||||||
1936 | -9.50 | -12.84 | 22.52 | 33.73 | b | 61.03 | 63.93 | 79.34 | 69.52 | 58.68 | 39.56 | 24.67 | 12.40 | 36.92 | ||||||||||||
1937 | -9.79 | 3.57 | 21.60 | 37.93 | 55.48 | 61.08 | 69.15 | 71.81 | 56.78 | 42.24 | 22.16 | a | 7.85 | 36.66 | ||||||||||||
1938 | 4.55 | 6.25 | 33.23 | 41.55 | 50.16 | 62.35 | 69.10 | 70.05 | 60.95 | 49.98 | 21.77 | 15.13 | a | 40.42 | ||||||||||||
1939 | 9.11 | -4.25 | 21.42 | 39.20 | 59.90 | 60.68 | 72.89 | 70.32 | 58.30 | 40.24 | 34.70 | 25.08 | 40.63 | |||||||||||||
1940 | 1.69 | 13.10 | 16.35 | 35.97 | 53.42 | 62.02 | 71.69 | 65.60 | 62.48 | 49.35 | 22.22 | 16.39 | 39.19 | |||||||||||||
1941 | 7.21 | 6.50 | 20.52 | 43.93 | 56.98 | 64.58 | 71.35 | 67.56 | 55.72 | 44.19 | 28.35 | 19.73 | 40.55 | |||||||||||||
1942 | 16.76 | 10.96 | 29.98 | 43.92 | 49.98 | 60.20 | 66.71 | 66.02 | 52.68 | 46.53 | 26.70 | 5.89 | 39.69 | |||||||||||||
1943 | -3.24 | 12.00 | 16.58 | 43.20 | 49.56 | 61.60 | 72.63 | 67.98 | 55.70 | 47.94 | 27.40 | 18.92 | 39.19 | |||||||||||||
1944 | 20.02 | 10.79 | 17.71 | 39.92 | 57.68 | 63.78 | 68.85 | 65.84 | 55.93 | 47.55 | 28.95 | 12.95 | 40.83 | |||||||||||||
1945 | 9.34 | 12.00 | 33.61 | 37.50 | 46.19 | 58.52 | 68.06 | 67.06 | 54.70 | 43.87 | a | 22.64 | a | 4.69 | 38.18 | |||||||||||
1946 | 4.90 | 5.98 | 34.47 | a | 46.87 | 53.20 | f | 63.57 | 70.65 | 65.45 | 55.15 | 41.10 | 25.00 | a | 12.14 | b | 38.66 | a | ||||||||
1947 | 13.37 | 7.75 | 22.76 | 39.23 | 49.15 | 58.72 | 70.08 | a | 69.61 | 55.02 | 50.00 | e | 20.87 | c | 10.04 | e | 38.88 | |||||||||
1948 | 3.80 | d | 3.04 | a | 15.15 | 37.59 | a | 55.13 | 62.25 | 68.76 | 68.11 | 63.86 | a | 47.29 | 28.25 | 9.82 | 38.59 | |||||||||
1949 | 3.21 | b | 1.31 | b | 20.60 | 46.57 | 55.14 | b | 63.45 | 68.60 | 70.55 | 55.58 | 43.58 | 35.12 | a | 7.05 | 39.23 | |||||||||
1950 | -10.90 | 7.54 | a | 18.95 | a | 31.12 | b | 49.90 | b | 62.17 | 66.38 | a | 64.15 | a | 58.68 | 46.31 | 20.60 | 6.35 | 35.10 | |||||||
1951 | 0.82 | 10.25 | 15.00 | 39.02 | 57.23 | 58.58 | 67.45 | 64.06 | 52.95 | 41.79 | 20.33 | 5.08 | 36.05 | |||||||||||||
1952 | 1.73 | 17.40 | 20.95 | 47.90 | 55.21 | 65.15 | 67.26 | 67.15 | 60.60 | 41.66 | 30.13 | 16.15 | 40.94 | |||||||||||||
1953 | 9.94 | 17.34 | 25.63 | 37.23 | 52.69 | 63.98 | h | 67.69 | 70.31 | 57.12 | a | 52.13 | 34.83 | 16.18 | 40.10 | a | ||||||||||
1954 | -2.73 | 28.00 | 23.26 | 39.50 | 49.18 | 61.70 | 68.76 | 65.60 | 54.72 | a | 43.98 | d | 33.17 | 19.55 | 40.39 | |||||||||||
1955 | 8.23 | 5.79 | 15.87 | 49.10 | 58.18 | 63.69 | a | 71.67 | a | 70.95 | 56.29 | a | 47.18 | a | 15.97 | 3.39 | 38.86 | |||||||||
1956 | 5.00 | 5.74 | 17.00 | 32.75 | 52.47 | 67.87 | 65.40 | 65.42 | 54.08 | 50.39 | d | 28.58 | 14.77 | 38.29 | ||||||||||||
1957 | 1.06 | 9.79 | 25.42 | 40.22 | 53.62 | a | 60.25 | 72.16 | 66.45 | 53.67 | 43.76 | 27.48 | b | 19.50 | 39.45 | |||||||||||
1958 | 16.17 | a | 10.23 | 27.90 | 43.47 | 55.39 | 57.10 | 63.97 | 67.35 | 57.73 | 46.74 | 26.18 | 7.66 | 39.99 | ||||||||||||
1959 | 0.32 | a | 5.54 | 29.45 | 41.52 | 52.74 | 65.47 | 69.53 | 70.73 | 57.43 | 37.73 | a | 18.08 | 22.63 | 39.26 | |||||||||||
1960 | 6.47 | 9.50 | 14.60 | 39.42 | 54.63 | 62.31 | a | 69.05 | 68.00 | f | 58.70 | 45.95 | 27.83 | 10.00 | 36.22 | a | ||||||||||
1961 | 8.17 | b | 16.48 | 31.61 | 34.91 | a | 52.08 | 67.28 | 67.39 | 70.97 | 53.67 | 45.58 | 27.95 | 6.81 | 40.24 | |||||||||||
1962 | 3.13 | 4.82 | 20.05 | 38.28 | 52.24 | 63.13 | 65.56 | 68.29 | 54.12 | 48.19 | 31.90 | 15.31 | 38.75 | |||||||||||||
1963 | 1.24 | 9.55 | 31.52 | 42.97 | 52.00 | 67.17 | 70.40 | 68.26 | 60.88 | 55.87 | 31.62 | 6.48 | 41.50 | |||||||||||||
1964 | 13.31 | 17.34 | 18.23 | 42.42 | 57.58 | 61.70 | 70.65 | 63.21 | 54.18 | 45.89 | 26.78 | 1.71 | 39.42 | |||||||||||||
1965 | -1.73 | 7.59 | 14.47 | 39.22 | 52.47 | 61.08 | 66.03 | ----- | z | 45.62 | 46.82 | 24.22 | 17.85 | 33.97 | a | |||||||||||
1966 | -7.81 | 5.17 | a | 27.92 | 34.95 | 50.32 | 63.75 | 70.93 | a | 64.68 | 58.40 | 44.65 | 20.25 | 9.95 | 36.93 | |||||||||||
1967 | 7.39 | 3.35 | a | 24.40 | 36.22 | a | 49.16 | 62.00 | 67.60 | 67.15 | 61.40 | 43.98 | 27.07 | 12.66 | 38.53 | |||||||||||
1968 | 4.48 | 7.64 | 31.60 | 41.87 | 50.60 | 61.67 | 66.32 | 64.50 | 57.70 | 45.37 | 28.28 | 7.60 | 38.97 | |||||||||||||
1969 | -3.48 | 11.05 | 15.05 | 43.27 | 54.94 | 56.85 | 67.06 | 71.83 | a | 58.70 | 39.15 | a | 29.88 | 15.40 | 38.31 | |||||||||||
1970 | -0.71 | 10.82 | 16.06 | 38.03 | 50.85 | 66.69 | a | 69.92 | 68.60 | 57.87 | 44.52 | 24.65 | 6.89 | 37.85 | ||||||||||||
1971 | -2.74 | 10.79 | 23.23 | a | 42.83 | 52.90 | 65.30 | 64.05 | 68.16 | 57.30 | 46.40 | 25.43 | 9.98 | 38.64 | ||||||||||||
1972 | 1.10 | 4.47 | 23.10 | 38.15 | 58.62 | a | 64.87 | 64.50 | 68.66 | 54.60 | 41.39 | 25.00 | 3.94 | 37.36 | ||||||||||||
1973 | 12.89 | 16.39 | 34.19 | 41.27 | 54.98 | 64.55 | 68.10 | a | 71.05 | 55.63 | 49.75 | a | 22.35 | 7.35 | 41.54 | |||||||||||
1974 | -0.81 | 7.91 | 18.06 | 40.07 | 50.10 | a | 63.75 | 72.15 | 62.94 | 53.68 | 47.62 | a | 28.67 | 19.00 | a | 38.59 | ||||||||||
1975 | 9.21 | 8.68 | 19.23 | a | 34.33 | a | 55.19 | 63.38 | ----- | z | 66.23 | 54.67 | 47.05 | 30.77 | 13.06 | 36.53 | a | |||||||||
1976 | 7.22 | a | 19.50 | 21.26 | 45.50 | 56.60 | 65.73 | 68.63 | a | 70.03 | 60.15 | 39.81 | 22.92 | 7.08 | a | 40.37 | ||||||||||
1977 | -4.34 | 18.04 | 31.35 | 49.62 | a | 64.13 | 64.08 | 68.05 | 58.55 | 52.95 | 45.35 | a | 24.37 | 3.73 | 39.66 | |||||||||||
1978 | -4.89 | 3.00 | a | 22.29 | 40.20 | 58.13 | 63.55 | 68.08 | a | 67.60 | 61.78 | 45.37 | 20.08 | 4.19 | 37.45 | |||||||||||
1979 | -7.90 | b | -4.27 | 17.13 | a | 30.87 | 47.39 | 62.70 | 69.03 | 64.40 | 59.33 | 43.18 | a | 23.43 | 20.00 | 35.44 | ||||||||||
1980 | 3.65 | 8.43 | 18.98 | 49.17 | 59.89 | 63.67 | 69.85 | 63.68 | 55.87 | 42.03 | b | 30.72 | 11.57 | a | 39.79 | |||||||||||
1981 | 12.58 | 19.16 | 33.29 | 45.53 | 54.13 | a | 60.00 | 67.56 | 68.44 | 57.20 | 43.47 | 35.33 | 8.68 | 42.11 | ||||||||||||
1982 | -9.65 | d | 8.20 | a | 20.91 | c | 39.20 | 55.53 | 57.74 | a | 66.86 | b | 63.68 | a | 56.66 | b | 44.25 | a | 23.20 | 19.02 | c | 37.13 | ||||
1983 | 15.26 | 19.02 | a | 26.18 | 39.02 | 50.47 | 64.07 | a | 72.06 | 73.67 | b | 57.48 | a | 44.22 | d | 28.17 | -2.17 | b | 40.62 | |||||||
1984 | 9.46 | c | 23.26 | 21.68 | 43.50 | 53.47 | 63.15 | 69.45 | b | 71.48 | 53.13 | 45.42 | 27.25 | 7.33 | a | 40.72 | ||||||||||
1985 | 4.76 | 9.68 | 31.35 | 46.67 | 60.27 | a | 59.29 | b | 68.07 | b | 63.60 | a | 51.91 | a | 42.89 | 13.78 | 3.47 | a | 37.98 | |||||||
1986 | 13.87 | a | 11.25 | d | 32.23 | 42.52 | a | 57.95 | 66.88 | a | 69.84 | b | 64.98 | b | 54.85 | 45.55 | 19.27 | 16.61 | 41.32 | |||||||
1987 | 14.57 | b | 22.62 | c | 25.50 | a | 51.95 | b | 59.92 | a | 68.74 | a | 70.14 | b | 66.02 | a | 59.93 | a | 41.98 | c | 33.52 | 18.47 | b | 44.45 | ||
1988 | 3.69 | b | 9.30 | a | 27.08 | a | 44.38 | 61.23 | 71.98 | b | 71.89 | 68.98 | a | 56.50 | 41.79 | 25.48 | 12.38 | b | 41.22 | |||||||
1989 | 10.11 | 0.64 | 18.78 | d | 40.48 | a | 56.53 | 62.36 | b | 72.89 | 67.87 | 58.13 | 44.71 | b | 20.66 | b | 4.48 | c | 38.14 | |||||||
1990 | 18.95 | a | 15.20 | a | 27.98 | 40.27 | 52.69 | 63.15 | 66.52 | a | 68.07 | a | 58.62 | 43.37 | 27.50 | a | 8.78 | b | 40.92 | |||||||
1991 | 3.93 | c | 19.65 | b | 27.12 | c | 44.47 | a | 58.59 | c | 65.42 | 66.40 | 69.34 | b | 55.08 | d | 38.03 | a | 18.17 | c | 13.89 | d | 40.01 | |||
1992 | 15.89 | d | 19.77 | c | 29.24 | b | 37.86 | a | 57.36 | c | 59.07 | a | 61.29 | 62.10 | 52.96 | d | 42.66 | b | 23.09 | c | 6.42 | g | 41.93 | a | ||
1993 | 5.05 | a | 7.72 | a | 22.82 | a | 41.16 | a | 53.62 | c | 58.78 | 62.88 | b | 64.57 | a | 52.29 | b | 41.32 | 24.04 | d | 10.59 | b | 37.07 | |||
1994 | -7.85 | a | 1.85 | b | 30.40 | e | 39.57 | b | 57.45 | a | 64.28 | 64.22 | b | 63.75 | c | 59.71 | a | 46.93 | c | 28.66 | b | 17.22 | d | 38.85 | ||
1995 | 7.55 | c | 8.38 | d | 21.33 | d | 35.36 | a | 52.12 | a | 67.35 | 66.59 | b | 69.40 | a | 56.00 | a | 40.27 | c | 18.39 | c | 8.14 | c | 37.57 | ||
1996 | -3.78 | d | 8.19 | b | 14.76 | 34.65 | 52.13 | 66.29 | b | 65.44 | 68.23 | a | 58.48 | a | 42.71 | 14.94 | d | 3.76 | 35.48 | |||||||
1997 | -0.88 | c | ----- | z | 18.43 | a | 34.75 | b | 50.71 | 66.73 | b | 67.97 | 66.06 | ----- | z | 44.34 | b | 22.53 | a | 22.70 | a | 39.34 | b | |||
1998 | 8.42 | e | 26.02 | b | 23.41 | b | 47.95 | 58.27 | a | 61.30 | b | 69.23 | 71.00 | a | 62.38 | 46.20 | c | 26.62 | a | 12.95 | c | 42.81 | ||||
1999 | 3.78 | b | 19.38 | b | 28.50 | c | 43.06 | c | 54.40 | a | 62.44 | c | 69.07 | b | 67.67 | a | 54.26 | c | 43.50 | c | 35.90 | a | 22.61 | c | 42.05 | |
2000 | 8.04 | e | 20.44 | c | 33.63 | d | 41.10 | a | ----- | z | ----- | z | 68.31 | b | 67.88 | b | 57.25 | 46.15 | a | 25.26 | g | -2.76 | d | 37.78 | c | |
2001 | 13.80 | a | 2.02 | b | 23.23 | e | 42.80 | b | 56.00 | a | 63.60 | 69.26 | f | ----- | z | ----- | z | 44.95 | b | ----- | z | 16.47 | 32.86 | d | ||
2002 | 13.77 | 23.30 | c | 16.89 | c | 37.44 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 22.85 | h | |
2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 4.85 | 10.95 | 23.69 | 40.69 | 54.26 | 63.12 | 68.71 | 67.33 | 56.63 | 44.41 | 25.43 | 11.30 | 39.22 | |||||||||||||
S.D. | 7.65 | 7.63 | 5.74 | 4.35 | 3.86 | 3.03 | 2.80 | 2.80 | 3.11 | 3.64 | 5.17 | 6.29 | 1.91 | |||||||||||||
SKEW | -0.17 | -0.09 | 0.17 | 0.15 | 0.21 | 0.26 | 0.35 | -0.30 | -0.25 | -0.05 | -0.05 | 0.04 | 0.15 | |||||||||||||
MAX | 20.02 | 28.00 | 34.47 | 51.95 | 64.13 | 71.98 | 79.34 | 73.67 | 63.86 | 55.87 | 35.90 | 25.08 | 44.45 | |||||||||||||
MIN | -10.90 | -12.84 | 14.47 | 30.87 | 46.19 | 56.85 | 61.29 | 58.55 | 45.62 | 32.79 | 13.78 | -2.76 | 35.10 | |||||||||||||
YRS | 77 | 76 | 77 | 77 | 74 | 74 | 74 | 73 | 74 | 76 | 74 | 76 | 65 |