YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.32 | 54.90 | 44.63 | 30.52 | 21.55 | a | -1.16 | 35.96 | f | |||||
1917 | -1.70 | a | -3.50 | 16.71 | 30.93 | b | 39.42 | 50.00 | 59.39 | 52.16 | 45.33 | ----- | z | 26.50 | ----- | z | 31.52 | b | ||||||||
1918 | ----- | z | ----- | z | ----- | z | 28.87 | 41.29 | 53.07 | 55.77 | a | 58.04 | g | 40.67 | 40.23 | a | ----- | z | ----- | z | 43.32 | f | ||||
1919 | ----- | z | ----- | z | ----- | z | ----- | z | 44.65 | h | 58.24 | a | 59.57 | a | 53.68 | 48.83 | a | ----- | z | ----- | z | 3.10 | a | 44.68 | g | |
1920 | 4.17 | b | 7.29 | a | 19.40 | a | 25.43 | 42.29 | 54.87 | 58.58 | 53.61 | 49.57 | 39.87 | a | 19.63 | 11.93 | a | 32.22 | ||||||||
1921 | 13.69 | b | 15.11 | 22.00 | b | ----- | z | 45.10 | 60.08 | f | 62.65 | 53.94 | ----- | z | ----- | z | 12.71 | p | 13.52 | 32.28 | e | |||||
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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 4.96 | f | ----- | z |
1972 | -4.39 | 0.34 | 17.10 | 29.67 | 47.74 | 51.47 | 58.03 | b | 59.06 | 46.03 | 33.27 | a | 24.13 | 3.90 | 30.53 | |||||||||||
1973 | 8.61 | 11.68 | 29.19 | 32.00 | 43.42 | 55.53 | 58.97 | 61.43 | c | 48.17 | 42.67 | a | 24.14 | a | 6.90 | 35.23 | ||||||||||
1974 | 1.39 | 9.29 | 19.68 | 34.28 | a | 41.60 | a | 53.55 | a | 63.94 | 55.47 | a | 43.11 | b | 37.29 | 23.60 | 14.39 | 33.13 | ||||||||
1975 | 7.65 | 5.36 | 12.87 | 29.87 | 46.37 | a | 55.40 | 61.87 | 59.00 | 45.87 | 37.32 | 25.33 | 10.58 | 33.12 | ||||||||||||
1976 | 1.53 | a | 16.28 | 18.45 | 35.03 | 42.10 | 54.67 | 60.33 | a | 58.57 | a | 45.63 | 30.87 | 15.66 | a | 1.35 | 31.71 | |||||||||
1977 | -7.70 | a | 12.36 | 24.68 | 38.37 | 53.06 | 56.23 | 61.81 | 54.58 | 50.23 | 36.52 | 22.17 | 6.29 | 34.05 | ||||||||||||
1978 | -6.68 | -1.04 | 18.23 | 34.03 | 46.39 | 54.10 | 60.06 | 58.68 | 54.20 | 36.55 | 20.77 | 6.00 | 31.77 | |||||||||||||
1979 | -7.68 | -5.64 | 15.29 | 30.57 | 41.03 | 53.83 | 61.13 | a | 57.10 | 49.83 | 34.52 | 22.23 | 17.39 | c | 30.80 | |||||||||||
1980 | 6.79 | c | 7.52 | 17.50 | a | 35.90 | 48.42 | 55.67 | 60.61 | 58.39 | 48.73 | 34.77 | 28.14 | a | 9.13 | a | 34.30 | |||||||||
1981 | 8.00 | a | 12.41 | a | 25.06 | 37.37 | 43.87 | 55.53 | 60.97 | 59.26 | 48.77 | 37.80 | a | 29.00 | 9.19 | 35.60 | ||||||||||
1982 | -9.90 | a | 6.11 | 20.90 | 28.50 | 48.65 | 50.57 | 61.71 | 58.29 | 49.17 | 38.30 | a | 19.72 | a | 16.73 | a | 32.40 | |||||||||
1983 | 11.13 | 16.79 | 23.43 | a | 30.10 | 41.68 | 55.72 | a | 64.77 | 63.65 | 49.37 | 37.97 | a | 27.93 | -7.10 | a | 34.62 | |||||||||
1984 | 5.74 | 21.74 | b | 14.63 | a | 35.53 | 43.61 | 56.83 | a | 60.00 | 61.40 | a | 44.47 | 40.45 | 23.43 | 7.78 | d | 34.63 | ||||||||
1985 | ----- | z | ----- | z | ----- | z | ----- | z | 50.97 | 53.17 | 57.31 | b | ----- | z | 48.40 | e | 34.76 | j | 10.25 | f | -1.07 | b | 41.76 | g | ||
1986 | 10.23 | 7.32 | c | 25.68 | 36.07 | a | 46.65 | 57.34 | a | 62.37 | a | 55.19 | 50.04 | c | 39.55 | 17.93 | 15.87 | a | 35.35 | |||||||
1987 | 13.90 | a | 22.88 | b | 26.55 | 38.20 | 51.87 | 57.83 | 63.61 | 56.52 | 49.96 | b | 32.29 | 28.67 | 16.43 | a | 38.23 | |||||||||
1988 | -2.57 | a | 1.39 | a | 23.52 | 33.03 | a | 49.58 | 58.83 | a | 60.65 | 60.45 | 48.59 | a | 32.26 | 23.03 | a | 10.33 | a | 33.26 | ||||||
1989 | 12.90 | -2.04 | 15.53 | a | 31.40 | 44.32 | 53.17 | 61.42 | 58.77 | 47.21 | a | 33.42 | 18.33 | 1.42 | 31.32 | |||||||||||
1990 | 17.07 | a | 10.61 | 25.13 | 32.97 | 43.90 | 55.47 | 57.00 | 59.10 | 51.57 | 34.58 | 25.47 | 4.58 | e | 34.79 | |||||||||||
1991 | 1.57 | c | 17.19 | b | 24.90 | b | 37.50 | 51.55 | 61.70 | 58.61 | 57.61 | 47.00 | c | 33.33 | a | 16.90 | a | 14.27 | a | 35.18 | ||||||
1992 | 15.26 | d | 20.81 | b | 24.71 | c | 31.90 | 46.24 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.79 | g | |
1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 4.31 | 9.14 | 20.92 | 32.94 | 45.64 | 55.12 | 60.63 | 57.53 | 47.81 | 36.11 | 22.92 | 7.99 | 33.61 | |||||||||||||
S.D. | 8.15 | 8.26 | 4.48 | 3.47 | 3.81 | 2.65 | 2.37 | 2.87 | 2.88 | 3.36 | 3.87 | 6.53 | 1.93 | |||||||||||||
SKEW | -0.21 | -0.09 | -0.06 | -0.13 | 0.36 | 0.23 | 0.04 | 0.01 | -0.37 | 0.06 | -0.12 | -0.38 | 0.32 | |||||||||||||
MAX | 17.07 | 22.88 | 29.19 | 38.37 | 53.06 | 61.70 | 65.32 | 63.65 | 54.20 | 42.67 | 29.00 | 17.39 | 38.23 | |||||||||||||
MIN | -9.90 | -5.64 | 12.87 | 25.43 | 39.42 | 50.00 | 55.77 | 52.16 | 40.67 | 30.52 | 15.66 | -7.10 | 30.53 | |||||||||||||
YRS | 23 | 23 | 23 | 23 | 25 | 24 | 26 | 24 | 25 | 22 | 22 | 24 | 20 |