YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 76.15 | 67.52 | 58.22 | 43.13 | 34.67 | a | 11.03 | a | 48.45 | f | ||||
1917 | 9.60 | a | 9.39 | a | 25.68 | 39.89 | b | 51.69 | 60.75 | 71.06 | 65.60 | 57.20 | ----- | z | 39.00 | ----- | z | 42.99 | b | |||||||
1918 | ----- | z | ----- | z | ----- | z | 40.58 | 54.97 | 65.37 | 67.38 | a | 69.02 | i | 53.13 | 51.17 | a | ----- | z | ----- | z | 55.43 | f | ||||
1919 | ----- | z | ----- | z | ----- | z | ----- | z | 57.22 | h | 67.67 | a | 73.00 | a | 67.77 | 64.52 | b | ----- | z | ----- | z | 12.48 | a | 57.09 | g | |
1920 | 14.50 | e | 18.68 | a | 30.69 | b | 35.53 | 54.84 | 65.75 | 70.76 | 66.84 | 63.38 | 53.65 | a | 29.37 | 20.17 | b | 43.68 | ||||||||
1921 | 23.43 | c | 27.11 | 34.19 | b | ----- | z | 57.39 | 71.26 | i | 74.10 | 66.85 | ----- | z | ----- | z | 24.04 | p | 23.23 | 43.76 | 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 | 14.20 | f | ----- | z |
1972 | 6.50 | 10.62 | 26.15 | 38.62 | 57.63 | 63.80 | 68.55 | b | 68.61 | 57.13 | 43.47 | a | 29.87 | 12.19 | 40.26 | |||||||||||
1973 | 16.34 | 19.46 | 36.18 | 42.02 | 54.18 | 67.43 | 70.10 | 72.36 | c | 57.95 | 53.03 | a | 32.09 | a | 14.55 | 44.64 | ||||||||||
1974 | 11.08 | 17.95 | 28.82 | 45.07 | a | 52.30 | a | 65.38 | a | 75.76 | 66.63 | a | 55.62 | b | 49.24 | 32.08 | 22.52 | 43.54 | ||||||||
1975 | 16.00 | a | 13.38 | 21.31 | 35.93 | 58.53 | a | 65.00 | 74.47 | 69.89 | 56.53 | 49.45 | 33.98 | 17.66 | 42.68 | |||||||||||
1976 | 11.52 | a | 24.91 | 28.13 | 47.43 | 54.94 | 68.10 | 73.52 | a | 71.35 | a | 59.58 | 42.13 | 26.05 | a | 12.60 | 43.35 | |||||||||
1977 | 1.75 | a | 21.79 | 32.92 | 49.90 | 64.89 | 67.75 | 72.56 | 64.63 | 60.02 | 46.32 | 30.03 | 13.58 | 43.84 | ||||||||||||
1978 | 2.06 | 7.70 | 27.11 | 41.92 | 57.48 | 65.15 | 70.29 | 69.74 | 65.35 | 47.52 | 30.25 | 14.02 | 41.55 | |||||||||||||
1979 | 0.10 | 4.00 | 23.34 | 38.32 | 51.71 | 64.60 | 71.33 | a | 66.47 | 61.55 | 45.60 | 30.28 | 25.91 | c | 40.27 | |||||||||||
1980 | 15.27 | c | 14.98 | 25.53 | a | 47.32 | 59.73 | 66.67 | 72.55 | 69.02 | 60.30 | 45.00 | 37.31 | a | 18.40 | a | 44.34 | |||||||||
1981 | 19.17 | a | 22.20 | a | 36.48 | 49.35 | 55.11 | 66.88 | 71.44 | 68.31 | 60.38 | 46.07 | a | 37.85 | 16.27 | 45.79 | ||||||||||
1982 | 0.85 | a | 14.71 | 28.15 | 39.62 | 57.48 | 61.20 | 71.68 | 68.66 | 58.62 | 47.27 | a | 27.22 | a | 24.02 | a | 41.62 | |||||||||
1983 | 17.87 | 22.80 | 29.18 | a | 38.40 | 52.31 | 64.81 | a | 75.55 | 75.11 | 60.55 | 46.88 | a | 32.03 | 0.10 | a | 42.97 | |||||||||
1984 | 13.60 | 27.80 | b | 21.30 | a | 43.57 | 53.61 | 66.09 | a | 70.58 | 71.85 | a | 55.07 | 48.37 | 32.85 | 17.00 | d | 43.47 | ||||||||
1985 | ----- | z | ----- | z | ----- | z | ----- | z | 63.54 | c | 64.57 | c | 70.36 | f | ----- | z | 56.39 | g | 45.95 | k | 17.57 | h | 8.11 | d | 45.41 | i |
1986 | 19.03 | a | 14.06 | d | 35.00 | b | 47.34 | b | 58.62 | a | 68.83 | d | 73.00 | e | 66.66 | b | 59.02 | f | 48.67 | b | 28.00 | c | 26.33 | b | 44.14 | a |
1987 | 24.16 | b | 32.86 | c | 36.10 | a | 53.88 | a | 65.38 | f | 70.30 | c | 75.16 | 67.79 | e | 61.98 | c | 44.50 | 37.40 | 23.89 | c | 48.00 | a | |||
1988 | 8.24 | b | 11.02 | a | 33.58 | 47.89 | b | 64.12 | a | 73.15 | d | 74.40 | b | 72.11 | d | 62.17 | d | 44.81 | 31.66 | a | 20.35 | d | 45.29 | |||
1989 | 23.43 | a | 8.41 | a | 25.38 | c | 44.12 | b | 58.74 | b | 66.52 | a | 73.38 | a | 70.55 | 59.67 | a | 48.57 | a | 28.15 | 9.66 | 43.05 | ||||
1990 | 27.50 | a | 23.05 | 34.87 | a | 46.63 | 55.66 | 67.78 | a | 68.98 | b | 69.73 | a | 64.32 | 47.21 | 35.23 | 15.38 | f | 49.18 | a | ||||||
1991 | 11.16 | c | 27.52 | b | 35.55 | b | 49.15 | 60.89 | 71.18 | 68.72 | a | 67.81 | b | 58.35 | d | 46.07 | b | 24.38 | a | 24.12 | b | 45.41 | ||||
1992 | 24.48 | d | 27.35 | b | 34.02 | c | 41.93 | 60.04 | c | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.56 | 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 | 13.81 | 18.34 | 29.98 | 43.67 | 57.10 | 66.45 | 72.18 | 68.83 | 59.63 | 47.19 | 31.81 | 16.88 | 43.28 | |||||||||||||
S.D. | 8.09 | 7.79 | 4.96 | 4.92 | 3.81 | 2.80 | 2.42 | 2.47 | 3.15 | 2.98 | 3.97 | 6.57 | 1.64 | |||||||||||||
SKEW | -0.15 | -0.03 | -0.23 | 0.12 | 0.44 | 0.24 | -0.15 | 0.64 | -0.01 | 0.48 | 0.14 | -0.51 | -0.40 | |||||||||||||
MAX | 27.50 | 32.86 | 36.48 | 53.88 | 64.89 | 73.15 | 76.15 | 75.11 | 65.35 | 53.65 | 39.00 | 26.33 | 45.79 | |||||||||||||
MIN | 0.10 | 4.00 | 21.30 | 35.53 | 51.69 | 60.75 | 67.38 | 64.63 | 53.13 | 42.13 | 24.38 | 0.10 | 40.26 | |||||||||||||
YRS | 23 | 23 | 23 | 23 | 24 | 24 | 25 | 24 | 23 | 22 | 22 | 23 | 17 |