YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1901 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 14.79 | b | 14.79 | k |
1902 | 17.61 | 17.46 | 19.74 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 40.13 | 32.77 | 25.07 | b | 19.93 | a | 24.68 | e | |||||
1903 | 27.30 | u | 15.82 | 23.23 | 30.55 | a | 35.53 | a | 41.67 | 45.48 | 45.52 | 40.93 | ----- | z | 26.70 | 16.16 | 32.16 | b | ||||||||
1904 | 14.41 | b | 24.45 | 29.10 | ----- | z | ----- | z | 41.80 | 45.29 | 45.16 | 42.50 | 32.58 | 20.93 | b | 18.58 | 31.48 | b | ||||||||
1905 | 19.90 | 20.19 | b | 27.35 | 28.60 | 36.61 | 43.53 | 43.10 | ----- | z | ----- | z | 31.71 | 24.60 | 11.00 | a | 28.66 | b | ||||||||
1906 | 13.23 | 20.68 | 25.26 | 28.97 | 34.90 | 41.43 | 44.61 | 43.32 | 38.70 | 29.42 | 22.27 | 23.52 | 30.53 | |||||||||||||
1907 | 22.55 | 23.07 | 27.84 | 29.83 | 31.37 | a | 38.67 | 44.74 | d | 45.41 | b | 41.30 | 31.90 | 19.97 | 18.06 | 31.23 | ||||||||||
1908 | 17.03 | a | 21.10 | 27.94 | 30.60 | 35.71 | 41.70 | 44.70 | a | 46.16 | ----- | z | ----- | z | ----- | z | ----- | z | 33.12 | d | ||||||
1909 | ----- | z | ----- | z | 20.39 | 28.17 | 31.13 | 41.10 | ----- | z | ----- | z | 35.11 | u | 34.06 | 26.60 | 15.84 | 28.18 | e | |||||||
1910 | 23.61 | 20.79 | 31.48 | 31.63 | 40.97 | 44.70 | 48.77 | 48.03 | 44.23 | 33.36 | i | 26.87 | 21.70 | a | 34.80 | a | ||||||||||
1911 | 28.16 | 22.64 | 30.45 | 31.17 | 38.39 | 45.62 | a | 48.47 | a | 49.52 | 45.80 | 33.81 | 23.80 | 14.84 | 34.39 | |||||||||||
1912 | 20.90 | 19.72 | 29.37 | a | 29.33 | 37.97 | a | 45.30 | 51.32 | 51.03 | a | 42.87 | 36.87 | a | 23.07 | a | 16.94 | 33.72 | ||||||||
1913 | 22.00 | b | 20.62 | b | 25.73 | a | 33.17 | 40.77 | 46.34 | a | 49.81 | 48.58 | 41.47 | 38.10 | a | 28.53 | 15.57 | a | 34.22 | |||||||
1914 | 28.80 | a | 20.36 | 18.77 | 24.53 | 35.45 | 46.97 | a | 48.87 | 49.16 | 44.87 | 39.55 | 35.29 | b | 11.53 | a | 33.68 | |||||||||
1915 | 6.68 | c | 9.81 | a | 17.90 | a | 34.07 | 37.42 | 48.70 | 51.63 | a | 47.87 | 45.03 | 34.81 | 30.07 | 23.42 | 32.28 | |||||||||
1916 | 22.47 | a | 26.21 | 31.55 | 33.27 | 41.68 | 51.47 | 52.13 | 53.60 | a | 48.73 | 39.06 | 27.30 | 20.03 | 37.29 | |||||||||||
1917 | 22.03 | a | 23.07 | 27.74 | 32.50 | 35.45 | 47.67 | 51.35 | 50.90 | 46.33 | 37.58 | 31.33 | 28.97 | 36.24 | ||||||||||||
1918 | 17.39 | 27.39 | 30.00 | 31.83 | 43.26 | 48.00 | 42.77 | 39.87 | 36.38 | a | 30.97 | 23.93 | a | 19.77 | a | 32.63 | ||||||||||
1919 | 18.23 | 19.75 | 26.42 | 35.86 | a | 38.26 | 44.63 | 50.06 | 50.10 | 46.14 | a | 39.67 | a | 28.30 | 27.71 | 35.43 | ||||||||||
1920 | 22.63 | a | 28.72 | 25.42 | 29.63 | 40.47 | a | 40.90 | 45.33 | a | 45.87 | 45.04 | b | 35.40 | a | 27.57 | 19.94 | 33.91 | ||||||||
1921 | 25.89 | c | 21.70 | a | 31.85 | d | 30.18 | b | 39.90 | a | 44.38 | a | 51.58 | 49.06 | 46.37 | 37.03 | b | 30.69 | a | 26.58 | 36.27 | |||||
1922 | 19.81 | 26.15 | b | 26.29 | 31.11 | c | 39.85 | d | 47.50 | 48.57 | a | 49.62 | b | 43.44 | c | 35.31 | e | 25.54 | d | 26.48 | b | 34.97 | ||||
1923 | 24.57 | c | 22.00 | d | 25.14 | c | 35.78 | c | ----- | z | 42.53 | 44.97 | b | 44.81 | 40.56 | c | 38.64 | c | 26.56 | c | 23.19 | d | 33.52 | a | ||
1924 | 19.85 | d | 24.08 | d | 21.29 | c | 31.80 | e | 38.82 | c | 50.43 | 50.42 | 50.27 | a | 40.57 | b | 36.11 | d | 31.04 | e | 24.37 | d | 34.92 | |||
1925 | 21.71 | c | 27.32 | c | 33.52 | f | 35.96 | c | 41.15 | d | 43.03 | 52.61 | 49.23 | a | 45.87 | 37.93 | d | 24.50 | d | 18.08 | f | 37.93 | b | |||
1926 | 14.08 | e | 28.21 | d | 29.11 | d | 34.65 | d | 40.07 | d | 46.53 | 48.32 | 47.94 | 46.60 | 40.40 | f | 29.30 | c | 19.81 | d | 34.97 | a | ||||
1927 | 29.54 | e | 30.88 | d | 28.77 | e | 34.23 | d | 45.77 | e | 46.73 | 50.97 | 48.32 | 45.56 | c | 35.81 | e | 33.31 | d | 21.33 | d | 37.60 | ||||
1928 | 26.46 | e | 24.52 | d | 32.22 | d | 34.00 | f | 43.67 | d | 52.13 | 50.45 | 46.39 | 40.84 | e | 35.56 | d | 24.08 | e | 20.12 | e | 36.04 | a | |||
1929 | 17.04 | d | 17.67 | d | 21.58 | e | 31.65 | d | 36.45 | b | 46.97 | a | 48.10 | 46.32 | 42.39 | b | 32.78 | d | 20.35 | d | 20.88 | e | 31.85 | |||
1930 | 16.38 | e | 23.67 | d | 21.77 | e | 40.42 | d | 38.33 | d | 46.93 | 49.48 | 48.90 | 45.67 | c | 37.70 | d | 24.52 | e | 16.63 | d | 34.20 | ||||
1931 | 19.56 | d | 24.67 | d | 23.77 | e | 31.77 | d | 38.72 | f | 47.85 | d | 49.74 | d | 47.58 | e | 48.08 | d | 38.93 | d | 28.12 | e | 20.62 | e | 34.61 | a |
1932 | 17.81 | e | 28.08 | e | 23.26 | d | 33.73 | d | 38.54 | e | 46.04 | d | 49.96 | f | 49.74 | d | 42.12 | e | 34.31 | e | 27.12 | e | 21.35 | e | 32.92 | a |
1933 | 21.35 | e | 18.83 | e | 30.70 | d | 27.48 | e | 37.44 | d | 47.88 | d | 50.04 | f | 49.52 | d | 47.36 | e | 38.27 | e | 28.08 | d | 25.28 | f | 34.69 | b |
1934 | 19.50 | e | 22.38 | d | 27.28 | f | 32.88 | e | 39.85 | e | 46.35 | d | 48.88 | f | 48.48 | d | 42.92 | f | 38.89 | d | 27.04 | e | 24.84 | f | 34.42 | d |
1935 | 25.50 | e | 19.22 | e | 28.46 | e | 31.50 | d | 34.27 | e | 44.12 | e | 47.54 | e | 48.30 | d | 41.38 | f | 39.07 | d | 26.19 | d | 21.48 | f | 34.42 | b |
1936 | 18.50 | e | 21.46 | e | 25.81 | e | 30.19 | d | 38.52 | f | 48.12 | d | 49.58 | e | 47.58 | e | 42.96 | e | 33.48 | d | 23.36 | e | 20.96 | e | 32.91 | a |
1937 | 17.69 | e | 22.23 | f | 23.15 | d | 31.38 | d | 37.65 | e | 46.31 | d | 47.19 | e | 48.58 | e | 44.80 | e | 36.50 | e | 26.92 | d | 22.65 | e | 34.80 | a |
1938 | 20.44 | f | 24.96 | e | 26.26 | d | 29.38 | d | 37.42 | e | 47.46 | d | 47.00 | f | 47.19 | d | 41.68 | e | 36.50 | e | 24.60 | e | 23.54 | e | 33.90 | b |
1939 | 18.88 | f | 13.83 | e | 26.22 | d | 32.12 | f | 38.50 | e | 44.92 | d | 48.08 | f | 45.93 | d | 43.60 | e | 32.38 | e | 24.04 | e | 23.08 | f | 33.68 | d |
1940 | 18.85 | e | 20.48 | f | 25.43 | h | 29.54 | d | 37.73 | e | 43.40 | e | 47.35 | e | 45.89 | d | 43.79 | f | 35.11 | d | 25.72 | e | 26.24 | f | 35.45 | d |
1941 | 19.96 | e | 24.77 | f | 22.68 | f | 28.64 | e | 40.15 | e | 41.56 | e | 46.42 | e | 46.81 | e | 42.76 | e | 36.85 | d | 25.62 | f | 22.52 | f | 37.89 | d |
1942 | 22.68 | f | 19.87 | e | 21.40 | f | 30.69 | d | 38.32 | f | 44.92 | d | 47.12 | e | 47.31 | e | 42.28 | e | 33.32 | f | 30.83 | f | 23.35 | e | 36.50 | e |
1943 | 21.56 | f | 22.70 | e | 28.19 | d | 34.58 | d | 40.36 | f | 45.04 | d | 47.91 | h | 49.04 | f | 42.84 | e | 32.54 | e | 24.32 | h | 19.76 | j | 34.31 | f |
1944 | 18.45 | 22.04 | b | 23.53 | a | 28.40 | 36.61 | 45.57 | 48.16 | 47.29 | 43.20 | 35.10 | 24.17 | 21.81 | 32.86 | |||||||||||
1945 | 19.03 | 24.63 | a | 24.10 | 28.87 | 40.32 | 43.90 | 46.87 | 47.26 | 43.10 | 35.13 | 28.23 | 19.71 | 33.43 | ||||||||||||
1946 | 17.87 | a | 19.86 | 24.90 | 35.90 | 38.32 | 46.50 | 48.23 | e | 48.41 | d | 44.79 | f | ----- | z | 24.47 | k | 23.76 | f | 35.00 | d | |||||
1947 | 17.23 | e | 22.83 | e | 25.81 | e | 31.00 | d | 39.27 | e | 45.84 | e | 48.65 | e | 47.52 | f | ----- | z | ----- | z | ----- | z | ----- | z | 32.95 | e |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | 43.39 | c | 51.40 | 51.42 | 51.13 | 45.67 | 36.81 | 24.03 | 27.03 | 41.36 | d | |||||||
1949 | 16.45 | 22.46 | 29.19 | 32.10 | 43.06 | 48.53 | 50.39 | 48.48 | 45.47 | 34.55 | 32.27 | 20.07 | a | 35.25 | ||||||||||||
1950 | 24.97 | a | 27.46 | 28.45 | 35.23 | 40.90 | 49.13 | 48.26 | 47.97 | 44.70 | 43.23 | 31.67 | 27.61 | 37.47 | ||||||||||||
1951 | 22.77 | 23.43 | 26.42 | 31.67 | 41.94 | 50.13 | 52.84 | 51.61 | 47.63 | 39.81 | 27.07 | 23.68 | 36.58 | |||||||||||||
1952 | 27.48 | 21.30 | b | 20.97 | 32.90 | 40.26 | 46.27 | 43.16 | 48.10 | 41.80 | ----- | z | ----- | z | ----- | z | 35.80 | c | ||||||||
1953 | ----- | z | 7.88 | t | 25.16 | 27.83 | 32.19 | 48.87 | 48.77 | 43.29 | 36.50 | 29.94 | 21.13 | 11.48 | 32.52 | b | ||||||||||
1954 | 17.00 | 19.79 | 23.32 | 31.30 | 33.27 | a | 42.20 | 43.94 | 44.58 | 41.00 | 32.58 | 21.07 | 14.97 | 30.42 | ||||||||||||
1955 | 12.03 | 12.18 | 23.23 | 27.80 | 34.87 | 39.40 | 44.13 | 43.26 | 39.27 | 30.52 | 23.37 | 21.23 | 29.27 | |||||||||||||
1956 | 20.35 | 13.17 | 22.13 | 25.57 | 34.90 | 42.57 | 43.19 | 41.61 | 37.80 | 32.10 | 18.47 | 16.23 | 29.01 | |||||||||||||
1957 | 24.81 | 28.11 | 23.77 | 29.23 | 34.16 | 42.40 | 47.32 | 45.42 | 37.00 | 32.39 | 19.53 | 20.27 | a | 32.03 | ||||||||||||
1958 | 11.90 | 19.54 | 20.03 | 27.60 | 36.26 | 46.00 | 46.61 | 45.32 | 43.23 | 31.97 | 23.07 | 20.42 | 31.00 | |||||||||||||
1959 | 18.35 | 18.21 | 18.39 | 28.37 | 36.84 | 43.50 | 45.16 | 47.10 | 41.57 | 33.06 | 23.27 | 19.39 | 31.10 | |||||||||||||
1960 | 13.00 | 12.48 | 21.88 | f | 29.13 | 34.84 | 43.53 | 44.71 | 45.03 | 40.33 | 32.10 | 26.03 | 16.55 | 30.70 | a | |||||||||||
1961 | 15.94 | 18.50 | 24.06 | 30.60 | 37.65 | 42.63 | 45.79 | b | 46.10 | 41.30 | 31.43 | a | 21.23 | 19.65 | 31.24 | |||||||||||
1962 | 15.26 | 22.64 | 18.03 | 30.90 | 36.19 | 41.33 | 46.45 | 44.03 | 42.27 | 33.23 | 24.53 | 19.65 | 31.21 | |||||||||||||
1963 | 15.74 | 18.93 | 23.93 | a | 31.60 | 36.55 | 41.87 | 46.13 | 44.35 | 39.17 | 30.23 | 21.57 | 14.03 | 30.34 | ||||||||||||
1964 | 9.77 | 11.17 | 22.67 | a | 33.30 | 33.42 | 37.53 | 42.10 | a | 42.82 | c | 39.73 | 28.17 | a | 20.35 | g | 17.35 | 28.91 | a | |||||||
1965 | 18.63 | a | 9.68 | 18.93 | a | 27.00 | 30.26 | 37.80 | 43.94 | 42.58 | 37.83 | 28.81 | 22.33 | 19.39 | 28.10 | |||||||||||
1966 | 8.81 | 3.29 | 10.37 | a | 24.93 | 35.32 | 41.00 | 44.42 | 41.87 | 39.11 | c | 30.13 | 23.09 | g | 16.00 | c | 26.84 | a | ||||||||
1967 | 14.29 | 18.89 | 27.81 | 34.03 | 31.42 | 41.93 | 45.11 | c | 42.68 | f | 38.41 | a | 34.25 | o | 25.74 | g | 13.93 | c | 29.54 | c | ||||||
1968 | 18.26 | d | 20.62 | 20.74 | 25.83 | 35.26 | 41.17 | a | 44.52 | 43.90 | 34.93 | b | 30.68 | 21.80 | 12.71 | c | 29.20 | |||||||||
1969 | 23.53 | a | 20.42 | b | 15.80 | a | 28.27 | d | 33.29 | 39.13 | 45.65 | 45.58 | 40.90 | 28.06 | n | 11.56 | e | 14.40 | k | 30.41 | b | |||||
1970 | 16.79 | q | 25.43 | e | 23.13 | a | 30.85 | d | 39.76 | j | 46.43 | 50.33 | a | ----- | z | ----- | z | 28.57 | a | 26.43 | 26.74 | 32.24 | d | |||
1971 | 22.16 | 21.04 | a | 27.87 | 29.86 | b | 39.84 | 48.60 | 51.42 | ----- | z | 46.80 | 35.70 | a | 29.77 | 22.10 | 34.10 | a | ||||||||
1972 | 23.58 | 24.86 | 34.10 | 34.97 | 41.13 | 48.43 | 49.84 | 47.39 | 44.17 | a | 39.20 | a | 22.90 | 22.45 | 36.08 | |||||||||||
1973 | 18.32 | 19.61 | 19.65 | ----- | z | ----- | z | 47.60 | 49.87 | 50.06 | 46.00 | 38.27 | a | 31.22 | c | ----- | z | 35.62 | c | |||||||
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 23.57 | 23.77 | 23.67 | j | ||
1980 | 25.13 | 24.90 | 24.61 | 29.77 | 38.03 | 54.20 | 52.94 | 50.10 | 47.47 | 33.26 | 26.52 | a | 29.90 | 36.40 | ||||||||||||
1981 | 23.48 | 25.71 | 24.58 | 36.17 | 39.77 | 50.13 | 51.94 | 47.84 | 45.07 | 38.16 | 32.07 | 26.23 | 36.76 | |||||||||||||
1982 | 23.03 | 24.39 | 29.87 | 34.40 | 39.10 | 48.73 | 50.77 | 50.23 | a | 46.70 | 34.97 | 27.67 | 20.74 | 35.88 | ||||||||||||
1983 | 22.32 | 22.18 | 25.50 | a | 27.27 | 38.19 | 46.47 | 50.42 | 49.77 | 47.63 | 38.29 | 27.67 | 24.10 | 34.98 | ||||||||||||
1984 | 21.16 | 21.45 | 27.10 | 30.50 | 44.61 | 47.47 | 49.42 | 48.71 | 44.00 | 33.97 | 27.20 | 25.42 | 35.08 | |||||||||||||
1985 | 18.84 | 20.75 | 27.13 | 35.50 | 41.90 | 49.30 | 50.71 | 50.55 | 43.63 | 36.71 | 31.07 | 26.32 | 36.03 | |||||||||||||
1986 | 27.71 | 27.25 | 30.39 | 37.93 | 40.55 | 47.83 | 50.39 | 49.13 | 45.03 | 36.23 | 28.90 | a | 22.42 | 36.98 | ||||||||||||
1987 | 22.90 | 22.36 | 24.29 | 31.63 | 38.26 | 40.63 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.01 | f | ||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 19.75 | 21.29 | 25.06 | 31.21 | 37.93 | 45.28 | 47.93 | 47.25 | 42.93 | 34.83 | 25.78 | 20.50 | 33.62 | |||||||||||||
S.D. | 4.73 | 4.89 | 4.29 | 3.08 | 3.33 | 3.49 | 2.88 | 2.67 | 3.17 | 3.27 | 3.98 | 4.41 | 2.65 | |||||||||||||
SKEW | -0.28 | -1.04 | -0.55 | 0.31 | -0.11 | -0.05 | -0.15 | -0.40 | -0.37 | -0.01 | -0.37 | -0.11 | -0.32 | |||||||||||||
MAX | 29.54 | 30.88 | 34.10 | 40.42 | 45.77 | 54.20 | 52.94 | 53.60 | 48.73 | 43.23 | 35.29 | 29.90 | 37.60 | |||||||||||||
MIN | 6.68 | 3.29 | 10.37 | 24.53 | 30.26 | 37.53 | 42.10 | 39.87 | 34.93 | 28.17 | 11.56 | 11.00 | 28.10 | |||||||||||||
YRS | 71 | 74 | 73 | 74 | 71 | 79 | 71 | 71 | 70 | 69 | 70 | 67 | 42 |