YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 77.78 | a | 69.08 | 56.57 | 43.11 | 31.48 | 8.45 | 47.75 | f | |||||
1917 | 2.68 | 1.46 | 23.26 | 40.32 | 52.84 | 61.65 | 70.84 | 65.16 | 57.53 | 36.76 | 35.91 | a | 5.90 | 37.86 | ||||||||||||
1918 | 0.47 | 11.30 | c | 36.40 | 40.82 | 56.97 | 65.05 | 68.65 | 68.87 | 53.77 | 48.61 | 35.42 | 25.34 | 42.64 | ||||||||||||
1919 | 18.79 | 13.10 | c | 28.95 | a | 44.07 | 56.95 | 68.52 | 72.45 | 67.53 | 61.52 | 41.90 | 24.80 | 6.95 | b | 42.13 | ||||||||||
1920 | 4.18 | 14.28 | 29.03 | 37.45 | 57.15 | 66.25 | 68.92 | 66.98 | 62.57 | 53.08 | 30.55 | 20.24 | 42.56 | |||||||||||||
1921 | 19.79 | 22.88 | 33.14 | b | 48.81 | c | 57.92 | a | 69.48 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.51 | g | ||
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 | 76.10 | 69.58 | 59.27 | 47.64 | b | 31.59 | a | 26.18 | a | 51.73 | f | |||
1958 | 21.96 | c | 15.90 | b | 31.85 | e | 47.66 | a | 61.90 | b | 62.02 | 68.69 | e | 70.03 | 62.93 | g | 53.74 | d | 34.54 | c | 14.55 | 43.89 | a | |||
1959 | 10.32 | 15.91 | 34.81 | 46.92 | 60.68 | 70.13 | 72.89 | 74.02 | 61.86 | a | 44.20 | a | 24.16 | a | 27.14 | c | 45.25 | |||||||||
1960 | 13.93 | c | 14.96 | b | 19.40 | a | 45.58 | 58.34 | 65.16 | a | 72.00 | 71.95 | 62.50 | 50.93 | b | 34.80 | 18.13 | a | 43.97 | |||||||
1961 | 15.63 | 27.26 | e | 36.31 | 40.00 | 55.30 | a | 69.37 | 70.31 | 72.22 | a | 60.38 | 50.76 | h | 34.07 | a | 15.37 | a | 45.11 | a | ||||||
1962 | 9.90 | a | 13.25 | b | 26.19 | 43.72 | 61.29 | b | 66.26 | a | 68.05 | a | 69.13 | a | 57.62 | a | 53.38 | b | 37.77 | 21.00 | 43.96 | |||||
1963 | 5.03 | 14.93 | 35.45 | 49.15 | 55.60 | a | 71.07 | 71.78 | a | 69.32 | 63.02 | 58.44 | 38.95 | 11.11 | 45.32 | |||||||||||
1964 | 20.17 | a | 25.17 | 25.42 | a | 47.76 | c | 61.02 | a | 68.44 | c | 76.35 | 68.18 | 62.36 | i | 49.69 | b | 35.50 | a | 12.15 | a | 44.53 | a | |||
1965 | 8.92 | 11.31 | a | 17.58 | a | 42.91 | b | 59.64 | c | 67.65 | 71.03 | a | 69.21 | 52.25 | b | 51.76 | 33.30 | 27.83 | a | 42.78 | ||||||
1966 | 3.26 | ----- | z | 37.42 | 41.95 | a | 54.98 | 68.28 | 76.00 | b | 67.04 | c | 61.65 | 49.45 | 29.38 | 17.61 | 46.09 | a | ||||||||
1967 | 15.40 | 9.30 | 30.95 | 46.48 | 53.96 | c | 66.38 | 69.67 | a | 67.35 | a | 60.20 | 49.18 | c | 33.27 | h | 22.28 | b | 44.65 | a | ||||||
1968 | 15.45 | 16.67 | 41.00 | 50.77 | 55.44 | 66.98 | b | 71.31 | ----- | z | 61.10 | 51.00 | 34.02 | 17.10 | 43.71 | a | ||||||||||
1969 | 8.45 | b | 20.10 | c | 22.39 | 49.52 | 61.38 | a | 61.09 | b | 72.71 | 72.73 | 62.85 | 46.45 | 33.40 | 18.81 | 44.16 | |||||||||
1970 | 3.82 | a | 14.89 | a | 23.95 | a | 44.82 | e | 59.79 | b | 70.63 | 74.00 | 71.23 | 61.98 | 49.23 | 31.98 | 16.81 | 43.59 | ||||||||
1971 | 6.12 | b | 18.11 | 28.60 | 48.42 | 56.78 | a | 71.33 | 68.17 | a | 70.28 | a | 62.58 | 53.19 | 32.73 | 16.84 | 44.43 | |||||||||
1972 | 7.11 | 11.41 | 27.16 | 42.53 | a | 61.16 | 67.05 | a | 69.37 | 69.26 | 59.93 | 46.10 | 33.08 | 12.20 | a | 42.20 | ||||||||||
1973 | 18.26 | 23.34 | 40.73 | a | 46.02 | 57.50 | 70.57 | 72.19 | 72.32 | 59.73 | 54.52 | 35.07 | 17.32 | 47.30 | ||||||||||||
1974 | 11.74 | 16.73 | 29.60 | 47.38 | 54.39 | 66.07 | 75.94 | 66.76 | 58.40 | 51.98 | 33.67 | 23.48 | 44.68 | |||||||||||||
1975 | 14.31 | 15.38 | 22.47 | 38.37 | 61.65 | 66.87 | 74.58 | 70.31 | 57.85 | 53.03 | 36.40 | 18.75 | a | 44.16 | ||||||||||||
1976 | 10.61 | 26.52 | 31.97 | 51.87 | 58.85 | 70.98 | ----- | z | 72.29 | 62.23 | 44.05 | 26.58 | 10.71 | b | 42.42 | a | ||||||||||
1977 | -0.87 | 23.32 | 36.67 | a | 53.73 | 66.52 | a | 69.23 | 74.62 | a | 67.45 | 61.45 | 48.92 | 30.97 | 14.03 | a | 45.50 | |||||||||
1978 | 5.32 | 10.29 | 28.92 | 44.35 | 60.73 | 67.03 | 69.97 | 69.00 | 65.52 | a | 51.13 | a | 31.91 | a | 14.02 | b | 43.18 | |||||||||
1979 | 1.29 | 7.80 | 26.31 | 41.37 | 54.95 | 67.38 | 71.81 | 68.61 | 63.00 | 48.82 | 31.62 | a | 26.21 | 42.43 | ||||||||||||
1980 | 16.82 | 16.21 | 28.23 | 51.12 | 63.35 | 68.23 | 75.10 | 71.27 | 62.80 | 47.18 | 38.25 | 20.19 | b | 46.56 | ||||||||||||
1981 | 19.98 | 24.32 | 40.58 | 51.95 | a | 59.37 | 68.68 | 74.08 | 70.79 | 61.48 | 48.37 | a | 39.02 | a | 16.08 | 47.89 | ||||||||||
1982 | 0.40 | a | 15.66 | 29.05 | a | 44.95 | 61.12 | b | 63.97 | 74.59 | b | 71.14 | b | 60.53 | a | 49.87 | 28.09 | b | 23.95 | 43.61 | ||||||
1983 | 18.48 | a | 25.00 | a | 32.92 | 41.55 | a | 54.65 | a | 67.22 | a | 76.62 | a | 76.02 | 61.34 | a | 46.97 | a | 32.34 | a | 0.07 | a | 44.43 | |||
1984 | 11.25 | c | 26.09 | 24.29 | 47.02 | 56.18 | 70.04 | b | 72.48 | 73.65 | 57.32 | 50.95 | 33.15 | 16.80 | a | 44.93 | ||||||||||
1985 | 8.18 | 13.93 | 35.26 | 51.67 | a | 63.70 | a | 64.60 | 72.56 | 66.32 | a | 59.50 | 46.13 | 23.07 | 6.93 | d | 42.65 | |||||||||
1986 | 16.50 | b | 13.19 | a | 32.43 | a | 49.15 | 58.88 | c | 69.00 | 72.61 | 66.11 | 59.60 | 48.97 | b | 27.42 | 22.97 | a | 44.73 | |||||||
1987 | 18.78 | a | 31.12 | 36.68 | a | 52.65 | 62.67 | a | 71.27 | 74.15 | 67.55 | 61.57 | 42.68 | 36.64 | b | 22.17 | a | 48.16 | ||||||||
1988 | 6.32 | 10.88 | a | 32.10 | 45.15 | 64.76 | 73.95 | 75.19 | 73.03 | a | 60.53 | 42.37 | 29.76 | a | 18.03 | 44.34 | ||||||||||
1989 | 18.60 | 6.20 | 24.26 | 43.08 | 56.63 | a | 66.48 | 73.81 | 69.45 | 59.07 | 46.95 | a | 26.65 | 8.37 | 41.63 | |||||||||||
1990 | 23.66 | 19.48 | a | 33.11 | 45.72 | 54.38 | a | 68.23 | 70.23 | 66.95 | 62.43 | 45.61 | 35.00 | 13.32 | 44.84 | |||||||||||
1991 | 9.44 | 22.98 | 31.66 | 47.97 | 59.76 | 71.53 | 71.73 | 70.37 | 58.19 | a | 45.15 | 23.27 | 17.98 | b | 44.17 | |||||||||||
1992 | 18.67 | a | 25.14 | a | 32.29 | 40.97 | 60.28 | a | 64.46 | b | 64.63 | a | 64.68 | c | 57.67 | d | 46.19 | 29.44 | d | 17.95 | c | 43.53 | ||||
1993 | 9.08 | f | 13.38 | c | 25.62 | a | 42.69 | a | 56.78 | a | 63.48 | a | 69.24 | 69.25 | c | 54.13 | c | 44.82 | a | 27.96 | b | 17.04 | c | 44.04 | a | |
1994 | 2.82 | c | 8.92 | c | 31.92 | 43.41 | a | 61.13 | a | 68.48 | 68.52 | a | 66.57 | d | 63.09 | b | 50.59 | c | 36.59 | b | 20.83 | b | 43.57 | |||
1995 | 14.20 | a | 17.80 | a | 33.02 | c | 39.91 | a | 55.18 | a | 70.66 | a | 71.45 | c | 71.98 | a | 58.45 | 45.47 | b | 24.44 | c | 16.44 | 43.25 | |||
1996 | 5.52 | a | 13.18 | a | 22.52 | b | 40.45 | a | 55.02 | a | 68.23 | 69.15 | 68.97 | 59.65 | 47.53 | b | 22.50 | a | 9.93 | a | 40.22 | |||||
1997 | 6.07 | a | 17.50 | a | 26.16 | b | 42.66 | b | 53.29 | b | 70.28 | a | 70.66 | 68.13 | 62.05 | 48.81 | 25.04 | c | 24.67 | b | 42.94 | |||||
1998 | 15.25 | a | 29.44 | a | 29.48 | 49.47 | a | 64.30 | c | 65.45 | 71.71 | 70.94 | 65.28 | 49.88 | b | 35.09 | b | 21.86 | b | 47.35 | ||||||
1999 | 9.43 | d | 26.23 | b | 32.22 | b | 46.38 | 58.97 | 66.98 | b | 74.68 | 68.34 | b | 58.69 | c | 47.31 | d | 40.10 | a | 23.47 | 46.07 | |||||
2000 | 12.82 | 26.39 | a | 40.85 | 45.69 | a | 60.23 | 67.13 | 72.98 | 69.87 | 61.82 | 52.52 | b | 29.56 | d | 8.48 | b | 45.70 | ||||||||
2001 | 18.56 | e | 9.67 | g | 25.73 | a | 46.39 | b | 59.69 | 69.10 | 74.74 | 72.10 | 59.73 | 47.73 | 43.92 | 24.33 | d | 49.28 | a | |||||||
2002 | 24.08 | e | 27.27 | 23.28 | b | 45.11 | b | 53.94 | 70.60 | 75.58 | 69.45 | 63.88 | 40.81 | b | 31.52 | 25.88 | b | 45.95 | ||||||||
2003 | 13.76 | d | 13.71 | 31.83 | d | 47.47 | 57.05 | 67.13 | 71.94 | 72.34 | 61.09 | b | 51.17 | b | 29.50 | 23.55 | c | 45.05 | ||||||||
2004 | 12.90 | e | 22.11 | f | 37.16 | b | 48.55 | 54.74 | b | 63.93 | 69.87 | 64.00 | 66.62 | b | 50.73 | c | 36.38 | b | 21.75 | i | 50.49 | b | ||||
2005 | 13.41 | d | 24.80 | 30.83 | b | 50.72 | 55.10 | b | 71.62 | 74.13 | 69.76 | 65.12 | 51.06 | 36.36 | b | 16.56 | d | 46.62 | ||||||||
2006 | 26.42 | e | 16.73 | b | 31.89 | 51.45 | 59.37 | 69.32 | 76.55 | 70.42 | 58.48 | b | 46.24 | 33.45 | j | 26.18 | 48.46 | a | ||||||||
2007 | 19.09 | h | 9.54 | b | 34.40 | b | 44.45 | 62.00 | 69.92 | 72.83 | a | 69.50 | a | 62.88 | 52.40 | 33.12 | 12.47 | a | 47.59 | a | ||||||
2008 | 9.62 | a | 12.30 | b | 25.42 | 42.45 | b | 55.35 | a | 66.20 | 72.23 | a | 68.77 | 60.90 | a | 46.65 | 32.68 | 11.53 | n | 44.78 | a | |||||
2009 | 6.47 | m | 17.68 | k | 29.53 | n | 45.17 | 56.67 | h | 65.30 | e | 67.50 | f | 67.10 | f | 64.47 | 40.28 | o | ----- | z | ----- | z | 58.31 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 11.93 | 17.41 | 30.38 | 45.76 | 58.42 | 67.73 | 72.32 | 69.53 | 60.64 | 48.42 | 32.19 | 17.51 | 44.20 | |||||||||||||
S.D. | 6.79 | 6.69 | 5.53 | 3.90 | 3.28 | 2.72 | 2.72 | 2.42 | 2.84 | 3.86 | 4.69 | 6.29 | 2.00 | |||||||||||||
SKEW | 0.02 | 0.12 | -0.05 | 0.02 | 0.30 | -0.32 | -0.24 | 0.11 | -0.59 | -0.33 | -0.19 | -0.44 | -0.47 | |||||||||||||
MAX | 26.42 | 31.12 | 41.00 | 53.73 | 66.52 | 73.95 | 77.78 | 76.02 | 66.62 | 58.44 | 43.92 | 27.83 | 48.16 | |||||||||||||
MIN | -0.87 | 1.46 | 17.58 | 37.45 | 52.84 | 61.09 | 64.63 | 64.00 | 52.25 | 36.76 | 22.50 | 0.07 | 37.86 | |||||||||||||
YRS | 54 | 53 | 56 | 57 | 56 | 56 | 56 | 56 | 56 | 56 | 55 | 55 | 42 |