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 | 40.13 | a | 52.90 | 55.81 | 55.32 | 48.47 | 26.03 | 18.90 | 7.29 | 38.11 | d | |||||||
1926 | 4.26 | 12.07 | 12.84 | 27.00 | 44.94 | 49.00 | a | 57.52 | 53.97 | 41.60 | 32.06 | 12.80 | -0.90 | 28.93 | ||||||||||||
1927 | 0.48 | 3.93 | 22.35 | 31.17 | 38.74 | 49.77 | 53.58 | 49.87 | 44.73 | 34.39 | 11.93 | -9.32 | 27.64 | |||||||||||||
1928 | 1.23 | 7.31 | 13.71 | 23.33 | 43.23 | 46.60 | 56.03 | 52.48 | 40.47 | 29.87 | 20.10 | 11.29 | 28.80 | |||||||||||||
1929 | -16.84 | -8.64 | 19.10 | 29.40 | 35.10 | 47.50 | 54.77 | 53.29 | 40.43 | 34.13 | 12.33 | -0.42 | 25.01 | |||||||||||||
1930 | -13.00 | 11.50 | 15.58 | 33.00 | 39.55 | 51.23 | 56.94 | 55.90 | 42.97 | 31.35 | 18.07 | 8.29 | 29.28 | |||||||||||||
1931 | 8.65 | 17.39 | 15.84 | 28.67 | 37.97 | 54.57 | 56.71 | 53.71 | 48.00 | 36.45 | 20.57 | 10.77 | 32.44 | |||||||||||||
1932 | -1.90 | 0.41 | 7.42 | 31.17 | 42.16 | 55.73 | 55.42 | 55.61 | 42.17 | 29.03 | 13.33 | 1.29 | 27.65 | |||||||||||||
1933 | -0.29 | -3.07 | 16.39 | 28.67 | 42.87 | 56.97 | 57.39 | 53.74 | 46.10 | 26.77 | 14.40 | -7.65 | 27.69 | |||||||||||||
1934 | 1.19 | 4.18 | 11.77 | 29.93 | 45.97 | 50.97 | 55.81 | 51.13 | 39.40 | 37.23 | 22.53 | 0.32 | 29.20 | |||||||||||||
1935 | -11.35 | 13.18 | 15.10 | 28.57 | 39.19 | 48.00 | 61.35 | 52.87 | a | 42.60 | 28.68 | 4.57 | -0.35 | 26.87 | ||||||||||||
1936 | -18.61 | -21.72 | 14.26 | 22.83 | 45.48 | 49.90 | 63.29 | 55.77 | 45.73 | 25.45 | 15.17 | 3.65 | 25.10 | |||||||||||||
1937 | -18.32 | -5.36 | 12.81 | 29.27 | 43.84 | 49.67 | 58.06 | 58.32 | 43.27 | 31.84 | 12.77 | -1.39 | 26.23 | |||||||||||||
1938 | -3.87 | -3.46 | 21.71 | 27.90 | 40.13 | 50.10 | 56.45 | 55.52 | 47.43 | 37.90 | 10.87 | 6.97 | a | 28.97 | ||||||||||||
1939 | -0.48 | -14.50 | 10.03 | 27.30 | 45.10 | 49.70 | 58.23 | 55.58 | 44.47 | 30.84 | 22.70 | 15.29 | 28.69 | |||||||||||||
1940 | -8.16 | 5.48 | 7.84 | 27.73 | 41.06 | 48.33 | 57.81 | 54.90 | 48.73 | 38.52 | 15.60 | 7.23 | 28.76 | |||||||||||||
1941 | -2.35 | -2.43 | 11.23 | 34.93 | 45.61 | 54.40 | 58.35 | 54.61 | 45.53 | 33.35 | 20.23 | 10.45 | 30.33 | |||||||||||||
1942 | 6.29 | 1.57 | 21.48 | 33.00 | 39.10 | 50.17 | 54.00 | 53.87 | 41.27 | 34.29 | 15.57 | -3.97 | 28.89 | |||||||||||||
1943 | -12.19 | 1.68 | 6.77 | 30.60 | 37.39 | 50.57 | 59.19 | 55.23 | 42.50 | 34.10 | 20.63 | 7.23 | 27.81 | |||||||||||||
1944 | 9.87 | -0.48 | 8.13 | 28.00 | 44.90 | 51.73 | 54.55 | 54.58 | 46.13 | 34.00 | 24.47 | 3.65 | 29.96 | |||||||||||||
1945 | 1.68 | 1.39 | 22.68 | 27.23 | 33.42 | 47.43 | 55.48 | 54.77 | 43.07 | 30.53 | a | 15.48 | a | -3.65 | 27.46 | |||||||||||
1946 | -5.97 | -5.89 | 25.13 | a | 34.13 | 39.26 | 50.50 | 56.87 | 51.61 | 43.93 | 30.90 | 13.62 | a | 4.28 | b | 28.20 | ||||||||||
1947 | 1.55 | -1.04 | 13.71 | 29.33 | 36.48 | 49.20 | 56.77 | a | 55.32 | 42.07 | 38.08 | e | 13.30 | c | 0.79 | c | 27.96 | |||||||||
1948 | -8.28 | b | -7.83 | 4.94 | 27.67 | 41.97 | 50.43 | 58.16 | 54.61 | 49.66 | a | 34.68 | 20.63 | 0.55 | 27.27 | |||||||||||
1949 | -5.90 | b | -9.93 | a | 12.13 | 34.43 | 42.73 | a | 51.47 | 56.52 | 57.35 | 41.13 | 33.42 | 25.97 | a | -2.74 | 28.05 | |||||||||
1950 | -19.58 | -3.85 | a | 9.52 | 22.64 | b | 41.30 | a | 49.73 | 55.97 | a | 52.40 | a | 47.40 | 36.10 | 11.63 | -2.39 | 25.07 | ||||||||
1951 | -8.94 | 2.11 | 5.23 | 28.27 | 43.48 | 48.03 | 53.74 | 53.87 | 42.73 | 32.45 | 10.47 | -2.61 | 25.74 | |||||||||||||
1952 | -7.77 | 9.34 | 13.16 | 34.80 | 41.68 | 53.20 | 55.10 | 54.77 | 46.53 | 28.77 | 20.23 | 8.19 | 29.83 | |||||||||||||
1953 | 0.39 | 8.57 | 16.03 | 26.60 | 41.32 | 53.59 | h | 55.55 | 57.48 | 43.90 | 39.00 | 25.43 | 6.61 | 29.17 | a | |||||||||||
1954 | -12.94 | 20.36 | 14.00 | 27.87 | 36.00 | 51.13 | 55.10 | 53.52 | 44.97 | a | 33.17 | b | 22.97 | 11.35 | 29.79 | |||||||||||
1955 | -1.55 | -3.68 | 4.84 | 36.83 | 45.26 | 53.17 | a | 60.80 | a | 57.45 | 42.21 | a | 34.03 | a | 6.57 | -5.74 | 27.52 | |||||||||
1956 | -4.48 | -4.59 | 7.48 | 23.63 | 40.35 | 56.30 | 54.32 | 52.13 | 41.07 | 36.15 | d | 19.77 | 5.26 | 27.28 | ||||||||||||
1957 | -8.81 | 0.11 | 15.87 | 28.70 | 39.97 | 48.37 | 59.35 | 54.74 | 42.50 | 34.58 | 19.89 | b | 9.77 | 28.75 | ||||||||||||
1958 | 6.47 | a | 0.29 | 17.06 | 30.30 | 39.94 | 44.67 | 51.97 | 53.52 | 43.83 | 33.35 | 16.27 | -2.13 | 27.96 | ||||||||||||
1959 | -8.94 | -5.04 | 19.68 | 28.00 | 40.32 | 52.50 | 55.39 | 56.32 | 45.43 | 29.06 | 9.60 | 15.61 | 28.16 | |||||||||||||
1960 | -3.32 | -0.76 | 5.32 | 29.70 | 40.84 | 50.41 | a | 54.71 | 54.96 | f | 45.57 | 34.29 | 18.00 | -0.03 | 24.98 | a | ||||||||||
1961 | -2.45 | b | 7.79 | 23.00 | 24.21 | a | 37.23 | 51.63 | 55.23 | 56.19 | 42.37 | 34.13 | 17.03 | -2.19 | 28.68 | |||||||||||
1962 | -6.68 | -3.25 | 12.94 | 27.50 | 43.00 | 53.23 | 54.58 | 54.90 | 42.30 | 35.90 | 24.17 | 5.61 | 28.68 | |||||||||||||
1963 | -8.68 | -1.57 | 17.94 | 32.47 | 40.03 | 55.43 | 57.65 | 55.32 | 46.77 | 42.29 | 20.27 | -2.42 | 29.62 | |||||||||||||
1964 | 3.42 | 6.59 | 6.45 | 31.43 | 43.32 | 49.60 | 57.77 | 50.29 | 41.73 | 34.13 | 18.00 | -6.77 | 28.00 | |||||||||||||
1965 | -10.87 | -3.68 | 4.90 | 30.73 | 40.87 | 49.13 | 54.74 | ----- | z | 35.70 | 34.58 | 14.83 | 8.42 | 23.58 | a | |||||||||||
1966 | -16.81 | -5.41 | a | 19.71 | 26.17 | 36.97 | 52.50 | 60.40 | a | 53.52 | 45.57 | 32.84 | 11.50 | 0.61 | 26.46 | |||||||||||
1967 | -2.90 | -9.00 | 14.68 | 27.20 | 37.10 | 50.33 | 54.32 | 51.97 | 48.33 | 33.97 | 19.10 | 4.35 | 27.45 | |||||||||||||
1968 | -4.55 | -2.10 | 20.97 | 30.13 | 38.45 | 50.93 | 54.19 | 52.48 | 46.30 | 33.97 | 20.17 | 0.58 | 28.46 | |||||||||||||
1969 | -11.10 | 3.96 | 4.87 | 33.17 | 42.16 | 45.50 | 55.68 | 57.80 | a | 46.63 | 31.16 | 21.10 | 6.94 | 28.16 | ||||||||||||
1970 | -8.90 | -0.61 | 6.06 | 29.63 | 40.29 | 54.77 | 57.35 | 54.19 | 45.27 | 33.65 | 17.33 | -3.35 | 27.14 | |||||||||||||
1971 | -11.68 | 1.54 | 14.63 | a | 31.40 | 39.77 | 54.40 | 52.19 | 54.58 | 45.33 | 36.42 | 18.67 | 1.39 | 28.22 | ||||||||||||
1972 | -9.45 | -4.28 | 14.10 | 29.30 | 46.23 | a | 52.53 | 52.32 | 55.10 | 42.37 | 30.29 | 17.87 | -4.61 | 26.81 | ||||||||||||
1973 | 4.19 | 5.14 | 27.16 | 29.00 | 40.97 | 51.73 | 54.71 | 57.94 | 44.43 | 39.23 | a | 14.23 | 0.23 | 30.75 | ||||||||||||
1974 | -10.61 | -3.18 | 9.03 | 30.07 | 40.40 | a | 51.27 | 60.19 | 51.74 | 39.77 | 33.87 | 20.50 | 10.81 | 27.82 | ||||||||||||
1975 | -1.26 | -1.32 | 10.20 | a | 27.43 | 42.48 | 52.80 | ----- | z | 53.90 | 42.50 | 35.45 | 21.63 | 3.06 | 26.08 | a | ||||||||||
1976 | -3.10 | a | 9.79 | 10.42 | 32.83 | 41.06 | 52.83 | 54.03 | a | 54.26 | 42.83 | 26.77 | 11.07 | -4.35 | 27.37 | |||||||||||
1977 | -13.00 | 8.68 | 21.23 | 33.70 | 50.90 | 50.73 | 54.32 | 44.35 | 42.03 | 32.57 | a | 15.63 | -3.29 | 28.16 | ||||||||||||
1978 | -13.19 | -6.75 | 12.94 | 29.70 | 44.45 | 50.73 | 55.39 | 53.06 | 48.97 | 32.55 | 8.97 | -5.87 | 25.91 | |||||||||||||
1979 | -15.81 | -13.54 | 7.27 | a | 22.37 | 36.29 | 50.60 | 57.94 | 52.13 | 43.50 | 31.37 | a | 15.87 | 9.87 | 24.82 | |||||||||||
1980 | -6.13 | 0.03 | 8.81 | 34.10 | 44.03 | 50.17 | 56.39 | 51.71 | 43.67 | 31.28 | b | 21.60 | 1.71 | 28.11 | ||||||||||||
1981 | 3.00 | 10.61 | 22.06 | 30.93 | 40.77 | a | 48.73 | 55.35 | 55.87 | 43.03 | 32.94 | 26.17 | -0.03 | 30.79 | ||||||||||||
1982 | -19.86 | b | -1.18 | 12.61 | 26.10 | 44.71 | 45.50 | 55.03 | 50.16 | 42.90 | a | 35.81 | 14.43 | 11.73 | a | 26.50 | ||||||||||
1983 | 6.42 | 11.48 | a | 19.87 | 28.03 | 36.61 | 52.17 | 60.29 | 60.23 | 45.33 | 33.50 | c | 22.03 | -9.90 | b | 30.51 | ||||||||||
1984 | 0.30 | a | 16.03 | 13.39 | 32.43 | 39.39 | 51.03 | 56.97 | 58.00 | 39.53 | 36.13 | 17.63 | -3.00 | 29.82 | ||||||||||||
1985 | -5.55 | -0.71 | 22.10 | 32.47 | 47.06 | 48.45 | a | 54.65 | 52.29 | 42.31 | a | 31.74 | 5.20 | -6.03 | 27.00 | |||||||||||
1986 | 5.80 | a | 1.56 | a | 21.71 | 32.43 | 45.68 | 55.30 | 59.43 | a | 52.66 | b | 45.03 | 34.61 | 9.50 | 7.87 | 30.97 | |||||||||
1987 | 6.07 | b | 15.31 | b | 18.40 | a | 38.41 | a | 47.47 | a | 55.86 | a | 58.73 | a | 53.42 | 47.60 | 30.76 | b | 24.63 | 11.93 | a | 34.05 | ||||
1988 | -5.70 | a | -0.39 | a | 17.42 | 28.13 | 48.13 | 59.69 | a | 58.45 | 56.58 | 44.33 | 28.52 | 18.03 | 3.10 | b | 29.69 | |||||||||
1989 | -1.29 | -9.54 | 10.07 | b | 29.93 | 44.35 | 50.66 | a | 60.06 | 55.94 | 46.43 | 32.33 | a | 10.82 | b | -4.93 | c | 27.07 | ||||||||
1990 | 9.70 | a | 3.29 | 19.42 | 29.13 | 39.71 | 52.90 | 56.23 | a | 55.94 | 46.57 | 31.10 | 17.07 | a | -1.10 | a | 30.00 | |||||||||
1991 | -6.83 | b | 11.15 | b | 18.03 | b | 32.76 | a | 48.89 | c | 56.43 | 56.74 | 57.72 | b | 43.93 | c | 28.80 | a | 11.21 | a | 5.93 | d | 30.40 | |||
1992 | 7.41 | d | 11.57 | a | 21.10 | b | 28.10 | a | 43.93 | a | 48.48 | a | 51.29 | 51.23 | 41.37 | c | 31.70 | a | 18.41 | c | -0.85 | e | 29.48 | |||
1993 | -4.55 | -0.85 | a | 14.40 | a | 30.27 | 41.50 | c | 49.63 | 53.93 | b | 55.10 | a | 41.52 | a | 29.03 | 15.07 | b | 3.52 | b | 27.38 | |||||
1994 | -15.13 | a | -7.52 | a | 22.17 | b | 28.48 | a | 44.90 | a | 54.60 | 54.90 | b | 53.32 | c | 48.76 | a | 38.62 | b | 20.14 | a | 9.61 | c | 29.40 | ||
1995 | 0.80 | a | 0.08 | d | 15.11 | c | 27.31 | a | 41.53 | a | 57.70 | 57.33 | a | 57.65 | 44.52 | a | 33.14 | b | 11.28 | a | 1.13 | a | 28.96 | |||
1996 | -12.26 | d | -0.68 | a | 6.84 | 26.23 | 40.84 | 55.14 | b | 55.77 | 56.33 | a | 48.41 | a | 32.42 | 7.38 | a | -2.68 | 26.15 | |||||||
1997 | -8.50 | a | ----- | z | 9.97 | a | 25.11 | b | 39.00 | 55.18 | b | 58.32 | 54.87 | ----- | z | 35.17 | a | 16.69 | a | 16.10 | a | 30.19 | b | |||
1998 | 1.14 | c | 20.81 | b | 15.72 | b | 36.33 | 47.00 | a | 52.07 | b | 58.97 | 59.97 | a | 49.43 | 37.68 | c | 20.76 | a | 6.63 | a | 33.88 | ||||
1999 | -3.43 | a | 11.04 | a | 21.32 | c | 33.25 | b | 44.77 | a | 52.68 | b | 59.14 | b | 56.93 | a | 44.60 | 32.13 | a | 24.90 | a | 12.90 | a | 32.52 | ||
2000 | -1.82 | c | 10.44 | b | 23.70 | d | 29.33 | ----- | z | ----- | z | 58.70 | a | 57.21 | b | 45.57 | 35.74 | 17.11 | c | -10.93 | c | 26.51 | b | |||
2001 | 4.50 | a | -6.35 | b | 15.93 | c | 33.34 | a | 44.83 | a | 54.13 | 58.50 | e | ----- | z | ----- | z | 33.93 | a | ----- | z | 8.55 | 27.49 | c | ||
2002 | 5.84 | 13.32 | c | 6.96 | c | 25.79 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 12.98 | 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 | -4.48 | 1.54 | 14.37 | 29.60 | 41.76 | 51.49 | 56.52 | 54.50 | 44.21 | 33.21 | 16.78 | 2.51 | 28.44 | |||||||||||||
S.D. | 7.56 | 8.26 | 5.82 | 3.33 | 3.45 | 2.97 | 2.33 | 2.52 | 2.73 | 3.22 | 5.06 | 6.44 | 1.89 | |||||||||||||
SKEW | -0.09 | 0.14 | 0.06 | 0.13 | 0.12 | 0.23 | 0.30 | -0.69 | -0.12 | -0.02 | -0.28 | 0.12 | 0.64 | |||||||||||||
MAX | 9.87 | 20.81 | 27.16 | 38.41 | 50.90 | 59.69 | 63.29 | 60.23 | 49.66 | 42.29 | 26.17 | 16.10 | 34.05 | |||||||||||||
MIN | -19.86 | -21.72 | 4.84 | 22.37 | 33.42 | 44.67 | 51.29 | 44.35 | 35.70 | 25.45 | 4.57 | -10.93 | 24.82 | |||||||||||||
YRS | 77 | 76 | 77 | 77 | 76 | 75 | 76 | 74 | 75 | 77 | 76 | 77 | 69 |