| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1909 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1910 | ----- | z | 8.80 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1911 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1912 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1913 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 32.00 | z | ----- | z | ----- | z | ----- | z | 25.68 | 29.93 | 16.61 | 24.07 | ||||
| 1914 | 27.61 | ----- | z | ----- | z | ----- | z | 33.58 | ----- | z | ----- | z | ----- | z | 33.47 | ----- | z | ----- | z | ----- | z | 31.55 | ||||
| 1915 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1918 | ----- | z | ----- | z | 27.82 | i | 20.23 | 25.10 | 35.67 | 37.68 | 35.42 | 37.43 | 31.83 | a | 19.27 | 11.71 | 28.26 | |||||||||
| 1919 | 14.45 | 23.61 | 23.06 | 22.77 | 26.84 | 29.43 | 37.97 | 34.65 | 30.03 | 17.23 | 17.63 | 9.00 | 23.89 | |||||||||||||
| 1920 | 17.52 | 35.90 | 21.45 | 23.07 | 23.29 | c | 34.97 | a | 37.03 | 38.23 | a | 31.10 | 26.65 | 20.90 | 17.58 | 27.31 | ||||||||||
| 1921 | 15.81 | 22.64 | 24.60 | a | 25.10 | 31.06 | 37.23 | 34.06 | 33.76 | b | 26.07 | 26.00 | 21.94 | m | 13.27 | a | 26.33 | |||||||||
| 1922 | -2.58 | 9.29 | d | 14.24 | f | 21.10 | 28.88 | n | 36.30 | 36.61 | 36.97 | 28.37 | 27.26 | 16.10 | 15.71 | 22.51 | ||||||||||
| 1923 | 19.55 | 9.85 | a | 19.58 | 25.77 | 30.87 | 32.97 | 38.61 | 38.00 | 32.63 | 24.87 | 21.77 | 13.34 | b | 25.65 | |||||||||||
| 1924 | ----- | z | 24.66 | 17.10 | 19.50 | 28.87 | 32.23 | 36.03 | 33.94 | 28.80 | 26.13 | 21.45 | a | 4.55 | 24.84 | |||||||||||
| 1925 | 25.23 | 24.82 | 20.87 | 26.53 | 32.84 | 34.10 | a | 39.42 | 33.97 | a | 29.47 | 19.17 | g | 20.86 | a | 18.18 | i | 28.81 | ||||||||
| 1926 | 15.43 | a | 24.96 | 15.77 | a | 26.97 | 26.81 | 33.07 | 37.58 | 35.84 | 20.70 | 23.68 | 26.62 | a | 18.29 | 25.48 | ||||||||||
| 1927 | 20.61 | 22.43 | 21.00 | 23.25 | f | 27.45 | 33.91 | g | 34.45 | 32.29 | 29.67 | 25.19 | 26.67 | 5.39 | h | 26.64 | ||||||||||
| 1928 | 17.60 | a | 18.83 | e | 26.24 | b | 24.90 | a | 30.10 | 35.43 | b | 38.10 | a | 31.46 | c | 25.81 | c | 19.96 | g | 28.24 | m | 11.27 | e | 25.97 | ||
| 1929 | 7.42 | 3.25 | d | 19.93 | b | 25.57 | 23.00 | 30.48 | c | 32.33 | g | 33.72 | f | 24.70 | 24.15 | e | 7.19 | i | 24.10 | 20.29 | ||||||
| 1930 | -1.81 | 25.32 | 25.26 | 26.53 | 30.32 | 28.96 | d | 35.26 | 35.20 | a | 31.40 | j | 25.64 | q | ----- | z | 7.29 | 23.59 | ||||||||
| 1931 | 18.32 | 18.82 | 23.53 | a | 19.22 | c | 29.81 | 31.07 | 39.48 | 33.96 | f | 28.22 | g | 21.50 | c | 17.11 | b | 13.84 | 23.27 | |||||||
| 1932 | 11.10 | 9.65 | c | 26.84 | 25.72 | l | 30.16 | 34.47 | 33.16 | 32.97 | 27.64 | p | 22.45 | b | 25.37 | 6.35 | 23.25 | |||||||||
| 1933 | 13.00 | f | 10.68 | 23.23 | 22.93 | 26.77 | 36.83 | 37.10 | 34.32 | 26.20 | 21.52 | 15.47 | 27.27 | a | 25.66 | |||||||||||
| 1934 | 23.68 | 21.21 | 23.87 | 27.00 | 32.77 | 31.55 | j | 34.58 | 35.65 | 28.70 | 26.37 | a | 28.07 | 19.74 | 27.42 | |||||||||||
| 1935 | 14.50 | c | 17.11 | a | 20.32 | 25.97 | 26.26 | 33.19 | c | 38.10 | ----- | z | 28.00 | ----- | z | 10.33 | 15.16 | 22.89 | ||||||||
| 1936 | 17.61 | 19.45 | 21.68 | 26.63 | 30.29 | 35.97 | 37.81 | 33.50 | a | 25.60 | 20.52 | b | 6.77 | 3.75 | w | 25.07 | ||||||||||
| 1937 | ----- | z | 14.71 | 21.32 | c | 23.07 | 28.61 | 37.63 | 35.94 | 30.61 | 28.57 | 24.90 | 23.79 | a | 21.63 | a | 26.44 | |||||||||
| 1938 | 17.74 | 14.25 | 22.32 | 28.00 | 29.23 | 31.90 | a | 38.84 | 32.32 | 32.60 | 26.55 | 15.53 | 15.94 | 25.43 | ||||||||||||
| 1939 | 13.29 | 15.92 | b | 21.40 | a | 23.80 | 32.33 | g | 31.67 | ----- | z | 35.81 | 31.47 | 25.45 | 15.07 | 21.81 | 23.57 | |||||||||
| 1940 | 18.71 | 26.17 | 23.10 | 24.63 | 30.35 | 35.33 | ----- | z | 34.42 | 33.43 | 27.50 | g | 20.15 | d | 14.68 | 26.10 | ||||||||||
| 1941 | 18.84 | 21.93 | 17.81 | 23.30 | 29.34 | b | 33.83 | 37.39 | 39.45 | 29.69 | a | 24.61 | 23.67 | 19.39 | 26.60 | |||||||||||
| 1942 | 12.18 | c | 16.24 | g | 21.03 | 24.63 | 29.14 | b | 33.00 | 38.16 | 35.84 | 29.48 | e | 21.90 | 26.17 | g | 22.97 | 26.83 | ||||||||
| 1943 | ----- | z | 16.04 | 21.39 | 28.93 | 25.97 | 32.47 | 35.77 | 34.00 | 31.50 | 32.90 | u | 22.46 | f | 16.23 | 26.92 | ||||||||||
| 1944 | 6.90 | 20.93 | 20.90 | 24.57 | 28.32 | 35.27 | 38.61 | 34.74 | 31.70 | 30.15 | d | 20.97 | 17.68 | 25.90 | ||||||||||||
| 1945 | 17.81 | 21.50 | 19.32 | ----- | z | 34.03 | 33.10 | 36.00 | 35.39 | 27.23 | 23.32 | 25.63 | 18.24 | b | 26.51 | |||||||||||
| 1946 | 10.85 | e | 16.64 | 24.32 | 22.53 | 27.23 | 33.77 | 35.96 | c | 33.68 | 25.27 | 19.43 | a | 22.57 | 19.52 | 24.31 | ||||||||||
| 1947 | 8.87 | ----- | z | 20.29 | 22.90 | 30.71 | 34.30 | 35.90 | 32.94 | 28.53 | 28.90 | 22.33 | 19.42 | 25.92 | ||||||||||||
| 1948 | 14.32 | 13.34 | 19.29 | 22.57 | 28.52 | 37.87 | ----- | z | 31.93 | a | 27.17 | 20.35 | 19.96 | d | 10.26 | 22.33 | ||||||||||
| 1949 | -4.81 | 16.26 | a | 23.81 | j | 20.67 | ----- | z | 29.25 | n | 34.97 | a | 34.52 | 29.05 | i | 14.76 | f | 25.87 | 18.00 | 20.78 | ||||||
| 1950 | 15.74 | 20.64 | 24.29 | 20.62 | a | 27.13 | 35.03 | 33.45 | 35.52 | 29.62 | d | 31.80 | f | 30.77 | 30.23 | 27.55 | ||||||||||
| 1951 | 21.92 | r | ----- | z | ----- | z | 26.32 | h | 28.05 | j | 31.17 | 35.19 | 32.77 | 26.47 | 23.97 | 19.12 | d | 10.75 | g | 28.11 | ||||||
| 1952 | 14.58 | g | 15.41 | 19.58 | 26.27 | 31.16 | 34.83 | 38.06 | 35.33 | a | 29.80 | 20.81 | 6.27 | 13.45 | 24.63 | |||||||||||
| 1953 | 25.74 | 20.32 | 19.58 | 17.90 | 25.13 | 27.93 | 31.42 | 33.65 | ----- | z | ----- | z | ----- | z | ----- | z | 25.21 | |||||||||
| 1954 | ----- | z | 19.64 | 16.52 | 21.37 | 26.00 | 30.63 | c | ----- | z | 29.68 | 23.63 | 17.77 | 20.52 | a | 11.61 | 21.74 | |||||||||
| 1955 | 6.00 | 16.11 | 19.71 | 20.19 | c | 25.03 | 34.27 | 31.74 | 28.58 | 25.80 | 23.77 | 19.10 | 18.61 | 22.41 | ||||||||||||
| 1956 | ----- | z | ----- | z | ----- | z | 28.15 | j | 33.00 | o | 33.73 | 38.87 | 33.10 | 27.53 | 25.90 | 14.00 | 13.39 | 26.65 | ||||||||
| 1957 | 3.06 | 16.89 | 28.17 | b | 25.00 | 34.81 | 35.90 | i | 32.42 | 31.35 | ----- | z | ----- | z | ----- | z | ----- | z | 24.53 | |||||||
| 1958 | ----- | z | ----- | z | ----- | z | 21.23 | 31.35 | 37.80 | 36.45 | 36.13 | 26.13 | 21.77 | 20.63 | 18.84 | 27.82 | ||||||||||
| 1959 | 22.71 | 18.50 | 20.13 | 19.23 | 23.29 | 31.73 | 35.89 | c | 33.00 | 33.10 | 25.37 | a | 14.80 | 8.87 | 23.89 | |||||||||||
| 1960 | 12.66 | b | 17.45 | 22.84 | 25.37 | 24.32 | 27.90 | 40.89 | d | 32.83 | a | 29.13 | 24.58 | 21.32 | b | 13.77 | 24.42 | |||||||||
| 1961 | 16.20 | a | 22.79 | i | 19.81 | 21.52 | i | 30.07 | p | 37.13 | 35.55 | 40.91 | h | 19.33 | x | 22.23 | i | ----- | z | ----- | z | 27.17 | ||||
| 1962 | ----- | z | ----- | z | 22.43 | a | 22.10 | a | 30.69 | e | 30.73 | h | 34.26 | h | 35.93 | b | 31.33 | c | 24.74 | d | 24.66 | a | 17.73 | e | 26.20 | |
| 1963 | 4.93 | d | 27.00 | m | 23.48 | f | 28.73 | d | 34.00 | j | 35.33 | l | 34.58 | l | 36.86 | b | 36.55 | j | 28.79 | c | 27.42 | k | 19.19 | e | 23.70 | |
| 1964 | 15.30 | d | 15.12 | e | 18.62 | j | 20.68 | e | 24.55 | 33.96 | d | ----- | z | 32.78 | d | 23.93 | b | 22.52 | 14.60 | e | 18.61 | c | 22.20 | |||
| 1965 | 18.67 | a | 19.68 | 15.17 | a | 26.20 | 26.71 | 33.52 | c | 37.23 | 37.42 | 20.87 | 22.48 | 20.67 | 10.29 | 24.07 | ||||||||||
| 1966 | 16.71 | g | 12.89 | a | 18.71 | 20.38 | a | 25.06 | 32.25 | b | 33.19 | 34.17 | b | 30.24 | e | 21.00 | 23.47 | 20.19 | 24.69 | |||||||
| 1967 | 19.10 | 19.71 | 19.42 | 18.17 | a | 25.95 | j | 36.33 | 36.74 | 36.90 | 30.26 | c | 26.11 | c | 20.03 | 11.87 | 24.97 | |||||||||
| 1968 | 15.35 | 24.00 | 18.00 | f | 18.40 | ----- | z | 36.14 | p | 37.48 | 38.75 | c | 29.03 | 22.86 | b | 21.00 | b | 14.13 | 24.56 | |||||||
| 1969 | 14.90 | 13.71 | 16.87 | 20.70 | c | 29.53 | a | 38.83 | a | 35.45 | 29.74 | 30.13 | 20.23 | 15.50 | 17.74 | d | 23.61 | |||||||||
| 1970 | 18.68 | 19.89 | 18.29 | 17.24 | a | 25.65 | 37.27 | d | 35.14 | c | 29.56 | d | 22.77 | 17.64 | c | 22.04 | g | 4.27 | p | 24.21 | ||||||
| 1971 | 17.70 | a | 18.50 | 17.79 | b | 21.75 | f | 31.61 | 34.73 | 39.21 | g | 37.80 | f | 25.83 | 21.58 | 21.10 | 14.19 | 22.56 | ||||||||
| 1972 | 14.82 | c | 21.07 | 25.61 | 22.17 | 28.33 | a | 35.47 | 37.33 | d | 37.39 | 24.42 | d | 23.61 | 24.08 | f | 5.79 | b | 25.09 | |||||||
| 1973 | 15.39 | c | 22.07 | 21.03 | 22.85 | c | 28.33 | a | ----- | z | ----- | z | ----- | z | 31.73 | 23.77 | a | 27.73 | d | 24.18 | c | 24.12 | ||||
| 1974 | 12.93 | a | 20.36 | 23.55 | 23.43 | b | 26.96 | c | 34.12 | f | 40.08 | r | 34.33 | g | 27.44 | e | 18.21 | b | 21.87 | 10.46 | e | 20.58 | ||||
| 1975 | 15.31 | e | 18.86 | 20.10 | 21.26 | c | 26.97 | a | 34.97 | a | 43.58 | 35.35 | h | 28.13 | 29.85 | e | 17.91 | g | 21.00 | 26.00 | ||||||
| 1976 | 19.79 | b | 19.52 | 19.74 | d | 21.39 | b | 25.89 | d | 27.56 | l | 38.27 | e | 39.32 | c | 32.68 | e | 20.67 | a | 14.54 | b | 5.64 | f | 25.18 | ||
| 1977 | 5.17 | b | 12.79 | 17.58 | 20.33 | 27.83 | b | 37.40 | 36.71 | 41.04 | h | 31.83 | 24.23 | 20.03 | 21.82 | i | 23.39 | |||||||||
| 1978 | 23.97 | ----- | z | 25.52 | 23.96 | e | 24.58 | 33.93 | 37.61 | 37.45 | 27.83 | 19.79 | b | 8.92 | d | 7.84 | 24.67 | |||||||||
| 1979 | 8.03 | 22.86 | 24.14 | b | 25.60 | 30.80 | a | ----- | z | 37.68 | ----- | z | ----- | z | 31.71 | 18.60 | 19.77 | 24.35 | ||||||||
| 1980 | 17.16 | 26.28 | 23.31 | e | 25.03 | 30.83 | a | 35.66 | a | ----- | z | 30.18 | c | 31.60 | 23.81 | 22.10 | 19.97 | 25.99 | ||||||||
| 1981 | 22.00 | 18.57 | 23.30 | d | 25.59 | a | 29.97 | ----- | z | 32.90 | 36.32 | 30.64 | b | 24.10 | a | 21.40 | 22.52 | b | 26.12 | |||||||
| 1982 | 10.84 | 17.93 | 22.94 | 19.43 | 26.39 | 36.23 | 39.43 | q | 36.74 | 29.67 | 24.13 | 14.00 | 15.97 | 23.11 | ||||||||||||
| 1983 | 21.90 | 25.11 | 27.26 | 24.58 | k | 29.52 | 32.67 | 36.52 | 39.48 | 32.88 | v | 24.61 | 25.70 | 16.45 | 27.92 | |||||||||||
| 1984 | 12.87 | 21.52 | 26.23 | 25.47 | 27.83 | a | 31.70 | 36.70 | a | 35.52 | 30.23 | 25.32 | 23.20 | 11.23 | i | 26.96 | ||||||||||
| 1985 | 11.35 | 14.93 | 18.07 | a | 24.03 | 29.52 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 19.58 | ||||
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 37.80 | 32.29 | 36.58 | 28.47 | 20.45 | 24.43 | 12.94 | 27.57 | ||||||||
| 1987 | 8.97 | 18.61 | 22.10 | 25.38 | a | 31.42 | 36.40 | 37.19 | d | ----- | z | ----- | z | 19.16 | 20.67 | 15.26 | 23.51 | |||||||||
| 1988 | 11.93 | d | 15.76 | 21.00 | 27.40 | 27.13 | 35.77 | 34.52 | 30.06 | m | 26.10 | a | 22.23 | 19.57 | 8.71 | 22.74 | ||||||||||
| 1989 | 11.94 | 4.04 | 23.20 | a | 26.63 | 27.58 | 32.00 | 33.23 | 32.90 | j | 25.14 | h | 20.90 | 15.29 | i | 8.00 | 20.83 | |||||||||
| 1990 | 18.55 | 9.50 | 20.13 | 24.27 | 23.58 | 31.26 | k | ----- | z | 36.70 | k | ----- | z | ----- | z | 16.83 | -1.35 | 15.93 | ||||||||
| 1991 | 10.10 | 20.96 | 21.55 | 21.90 | ----- | z | 29.47 | 36.81 | ----- | z | 27.93 | 20.13 | 26.73 | 16.00 | 23.16 | |||||||||||
| 1992 | 12.52 | 23.76 | 18.23 | 26.03 | 27.71 | 35.05 | h | 37.48 | 33.87 | 24.43 | 20.90 | 15.87 | 6.90 | 22.52 | ||||||||||||
| 1993 | ----- | z | ----- | z | 22.48 | 22.97 | 29.81 | 31.73 | 29.39 | 31.26 | 24.53 | 22.87 | 2.27 | 13.81 | 23.11 | |||||||||||
| 1994 | 14.74 | 14.25 | 15.29 | 22.47 | 29.00 | 29.87 | 36.19 | 29.84 | 29.00 | 18.26 | 7.57 | 8.90 | 21.28 | |||||||||||||
| 1995 | 20.61 | 19.21 | 16.16 | 21.73 | 28.19 | 32.60 | ----- | z | ----- | z | ----- | z | ----- | z | 21.43 | ----- | z | 22.85 | ||||||||
| 1996 | ----- | z | ----- | z | ----- | z | 23.50 | 30.10 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 26.80 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 14.53 | 18.43 | 21.24 | 23.31 | 28.38 | 33.89 | 36.29 | 34.42 | 28.53 | 23.50 | 19.70 | 15.25 | 24.59 | |||||||||||||
| S.D. | 6.52 | 5.43 | 2.99 | 2.77 | 2.69 | 2.61 | 2.40 | 2.64 | 3.18 | 3.29 | 5.74 | 5.71 | 1.61 | |||||||||||||
| SKEW | -0.73 | -0.20 | 0.08 | -0.13 | 0.04 | -0.31 | -0.22 | -0.15 | -0.13 | 0.36 | -0.76 | -0.15 | -0.29 | |||||||||||||
| MAX | 27.61 | 35.90 | 28.17 | 28.93 | 34.81 | 38.83 | 43.58 | 39.48 | 37.43 | 31.83 | 30.77 | 30.23 | 27.31 | |||||||||||||
| MIN | -4.81 | 3.25 | 15.17 | 17.24 | 23.00 | 27.90 | 29.39 | 28.58 | 20.70 | 17.23 | 2.27 | -1.35 | 21.28 | |||||||||||||
| NO YRS | 65 | 66 | 68 | 70 | 69 | 63 | 62 | 61 | 64 | 65 | 64 | 66 | 14 | |||||||||||||