YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1898 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 61.92 | y | 61.31 | 58.60 | 42.33 | e | 30.32 | 16.86 | f | 48.14 | h | |||
1899 | 9.54 | e | 2.20 | f | 13.97 | a | 40.62 | 49.86 | b | 61.28 | ----- | z | 66.78 | m | 51.03 | 45.85 | e | 37.67 | 18.60 | b | 36.49 | c | ||||
1900 | 17.05 | a | 6.54 | b | 18.54 | c | 44.38 | e | 53.34 | 59.87 | 61.90 | 68.45 | b | 56.10 | 54.69 | b | 23.66 | e | 19.67 | d | 40.35 | |||||
1901 | 13.76 | b | 9.06 | a | 21.54 | e | 41.73 | 51.89 | c | 63.15 | c | 68.02 | a | 64.57 | a | 55.48 | a | 45.58 | 27.93 | a | 16.45 | 39.93 | ||||
1902 | 14.64 | b | 17.93 | a | 31.97 | a | 39.05 | b | 51.22 | a | 54.03 | a | 66.17 | a | 60.37 | 52.90 | 42.32 | c | 33.98 | b | 18.25 | a | 40.24 | |||
1903 | 12.52 | d | 14.52 | a | 29.73 | a | 37.18 | 52.54 | c | 55.87 | 64.10 | 58.58 | 54.68 | b | 46.05 | a | 26.72 | 13.69 | b | 38.85 | ||||||
1904 | 7.63 | 2.04 | a | 20.68 | a | 32.82 | 46.28 | d | ----- | z | 63.10 | g | 58.21 | b | 51.58 | e | 43.48 | c | 34.89 | c | 14.48 | i | 33.07 | c | ||
1905 | 8.95 | 9.85 | b | 24.20 | d | 36.03 | 45.46 | h | 58.21 | p | 62.64 | f | ----- | z | 56.41 | b | 57.06 | v | 28.65 | c | 20.12 | b | 26.32 | e | ||
1906 | 18.57 | a | 10.84 | 13.42 | 39.38 | 44.27 | a | 57.25 | b | 61.35 | a | 61.88 | a | 58.09 | a | 40.32 | a | ----- | z | ----- | z | 40.54 | b | |||
1907 | ----- | z | ----- | z | ----- | z | 27.94 | v | 37.50 | k | 58.06 | c | 62.36 | c | 59.24 | j | ----- | z | ----- | z | ----- | z | ----- | z | 60.21 | j |
1908 | ----- | z | 15.00 | y | ----- | z | 40.29 | f | 51.80 | c | 62.94 | e | 68.15 | g | 64.78 | f | 63.50 | b | 48.14 | b | 32.12 | d | 17.76 | f | 51.70 | g |
1909 | 15.98 | e | 18.97 | i | 22.33 | d | 31.20 | e | 48.22 | f | 63.70 | e | 64.87 | e | 65.67 | d | 54.24 | c | 42.77 | e | 36.02 | f | 18.96 | f | 45.09 | d |
1910 | 15.50 | e | 11.93 | e | 37.70 | f | 43.12 | d | 46.84 | f | 64.38 | d | 67.50 | e | 62.61 | d | 54.34 | h | 46.76 | d | 26.89 | g | 16.24 | f | 44.54 | e |
1911 | 14.02 | f | 20.11 | e | 25.26 | h | 39.92 | f | 57.08 | e | 64.35 | d | 64.81 | b | 60.85 | 53.67 | c | 42.30 | a | 25.96 | b | 25.73 | e | 46.10 | c | |
1912 | -4.25 | a | 9.00 | 18.05 | 39.15 | 51.21 | 58.90 | 65.55 | 57.45 | 56.50 | c | 46.63 | 32.03 | a | 21.60 | f | 39.11 | a | ||||||||
1913 | 14.24 | 6.85 | b | 18.68 | 40.87 | 48.95 | 63.67 | a | 62.85 | a | 64.23 | c | 54.73 | 43.15 | a | 35.45 | 28.14 | b | 40.15 | |||||||
1914 | 18.27 | 7.54 | b | 21.63 | 34.36 | a | 54.17 | b | 60.37 | 67.84 | 62.24 | 57.54 | b | 50.66 | 30.45 | 15.72 | b | 40.07 | ||||||||
1915 | 7.32 | i | 22.38 | 24.05 | 47.58 | 46.22 | a | 55.65 | 60.79 | 58.45 | a | 56.85 | 45.25 | c | 32.14 | b | 19.34 | b | 42.61 | a | ||||||
1916 | 12.78 | b | 11.18 | d | 17.00 | b | 37.60 | a | 49.69 | 55.23 | b | 71.28 | b | 66.65 | 53.35 | d | 43.47 | b | 28.73 | b | 14.70 | d | 38.47 | |||
1917 | 8.38 | a | 3.56 | b | 21.82 | 32.61 | c | 45.21 | 54.67 | 66.92 | 60.39 | 54.66 | b | 35.12 | b | 33.60 | d | 9.72 | b | 35.55 | ||||||
1918 | 2.95 | b | 12.84 | c | 30.23 | 37.60 | a | 51.52 | d | 58.04 | d | 64.00 | 63.84 | 47.91 | b | 45.45 | c | 34.58 | 23.20 | c | 39.35 | |||||
1919 | 20.98 | 18.91 | 27.30 | c | 38.20 | c | 52.00 | 67.57 | 68.32 | 64.55 | 57.85 | 42.91 | c | 26.95 | i | 9.00 | a | 42.51 | a | |||||||
1920 | 5.74 | 13.26 | 25.80 | a | 32.47 | a | 51.11 | 62.72 | 62.73 | 63.32 | 60.36 | a | 53.85 | 29.82 | 22.66 | 40.32 | ||||||||||
1921 | 19.10 | 19.66 | 25.92 | 45.07 | 53.78 | b | 68.26 | a | 73.00 | 65.08 | 60.67 | 45.57 | b | 24.75 | 19.78 | b | 43.39 | |||||||||
1922 | 12.31 | 12.54 | 26.82 | 37.77 | 59.33 | a | 62.33 | a | 64.06 | 65.00 | 62.12 | a | 44.16 | 34.37 | 15.03 | 41.32 | ||||||||||
1923 | 14.48 | 8.92 | c | 16.03 | 35.95 | 51.82 | 65.02 | 66.03 | 60.32 | 56.52 | 44.18 | 35.40 | a | 27.15 | 40.15 | |||||||||||
1924 | 5.90 | a | 18.62 | c | 24.46 | c | 36.16 | a | 42.98 | e | 58.62 | m | 62.05 | c | 61.67 | a | 51.43 | b | 49.82 | 31.55 | b | 12.12 | f | 38.46 | b | |
1925 | 13.30 | a | 16.50 | a | 25.37 | 43.25 | 46.94 | 61.72 | 63.77 | 65.08 | 56.43 | 34.21 | 29.32 | 17.26 | 39.43 | |||||||||||
1926 | 14.53 | 16.05 | 17.62 | a | 33.83 | 51.35 | 56.60 | 64.08 | 61.50 | a | 51.35 | 40.23 | 24.38 | a | 14.30 | a | 37.15 | |||||||||
1927 | 10.75 | a | 18.11 | 30.48 | 38.48 | a | 45.02 | 57.78 | 62.77 | a | 57.73 | 59.95 | b | 46.74 | 27.35 | c | 13.21 | 39.03 | ||||||||
1928 | 15.47 | b | 13.77 | a | 22.00 | b | 32.70 | 51.94 | 55.95 | a | ----- | z | 64.10 | 51.40 | a | 42.79 | b | 31.41 | b | 21.31 | e | 36.62 | a | |||
1929 | 5.65 | d | 7.94 | a | 26.82 | a | 39.62 | 46.46 | d | 57.07 | a | 65.05 | 63.73 | 54.73 | 43.03 | b | 27.86 | a | 16.32 | 37.86 | ||||||
1930 | 8.84 | 19.24 | a | 23.63 | 38.92 | 52.76 | 61.91 | a | 64.74 | 64.98 | a | 56.35 | 42.61 | d | 34.05 | 20.50 | 40.71 | |||||||||
1931 | 19.50 | 23.52 | 25.79 | 39.38 | b | 51.18 | 64.55 | 68.55 | 62.86 | b | 62.33 | 50.35 | 38.65 | 28.02 | b | 44.56 | ||||||||||
1932 | 23.41 | b | 17.89 | b | 19.07 | a | 35.27 | 50.79 | b | 62.81 | d | 65.56 | 66.03 | 56.48 | 41.12 | a | 27.22 | c | 17.59 | c | 40.27 | |||||
1933 | 19.24 | b | 14.26 | c | 22.52 | a | 36.12 | 52.06 | 69.11 | b | 67.75 | a | 63.68 | 59.62 | a | 40.63 | 24.66 | a | 15.15 | e | 40.40 | |||||
1934 | 20.27 | a | 7.50 | a | 19.08 | 34.45 | 55.47 | a | 62.13 | d | 64.20 | c | 61.31 | d | 52.56 | c | 46.47 | b | 33.38 | d | 17.16 | 39.50 | ||||
1935 | 12.30 | d | 17.36 | 25.88 | e | 35.93 | b | 47.25 | a | 57.41 | c | 70.59 | c | 64.55 | b | 54.36 | b | 44.52 | b | 26.26 | e | 18.36 | c | 39.56 | ||
1936 | 11.90 | a | 3.80 | d | 25.52 | d | 32.75 | 55.22 | a | 59.43 | 68.62 | a | 63.02 | g | 58.31 | c | 39.31 | e | 25.62 | d | 21.22 | f | 38.05 | b | ||
1937 | 10.45 | c | 17.70 | a | 18.73 | a | 34.78 | a | 51.87 | 61.62 | a | 66.92 | a | 69.56 | 56.83 | 41.02 | a | 29.66 | a | 17.10 | a | 39.69 | ||||
1938 | 12.66 | c | 17.87 | b | 30.87 | 39.55 | a | 51.47 | 60.05 | b | 64.37 | 67.34 | 55.35 | 48.97 | 32.08 | 19.85 | 41.70 | |||||||||
1939 | 17.50 | 11.44 | a | 21.37 | a | 34.83 | a | 53.08 | 62.43 | 67.21 | 64.55 | 56.78 | 42.92 | 33.20 | 26.17 | a | 40.96 | |||||||||
1940 | 11.53 | 19.24 | 19.48 | 34.03 | 47.87 | a | 59.25 | 66.38 | b | 64.47 | a | 58.98 | 46.58 | 30.05 | a | 22.08 | a | 40.00 | ||||||||
1941 | 16.44 | 18.14 | 21.90 | a | 46.13 | 56.69 | 64.26 | a | 67.64 | b | 62.79 | 59.17 | 44.82 | 32.72 | a | 25.45 | a | 43.01 | ||||||||
1942 | 16.89 | 16.91 | a | 28.82 | 46.93 | 50.84 | 61.02 | 64.02 | b | 64.45 | 52.19 | d | 46.98 | 29.97 | a | 16.52 | 41.29 | |||||||||
1943 | 11.45 | 18.52 | a | 19.63 | a | 36.05 | a | 50.74 | 62.55 | 69.44 | 64.23 | a | 52.68 | 45.42 | a | 29.08 | 19.89 | 39.97 | ||||||||
1944 | 24.50 | 18.16 | 21.52 | a | 35.95 | 55.50 | a | 62.60 | 66.68 | 66.16 | 56.47 | 46.66 | 35.21 | b | 17.37 | a | 42.23 | |||||||||
1945 | 8.07 | d | 16.91 | 36.63 | 38.81 | a | 44.11 | 57.32 | 62.78 | a | 63.87 | 55.40 | 42.79 | 30.50 | 14.89 | d | 39.34 | |||||||||
1946 | 15.13 | e | 13.88 | 36.39 | 40.30 | b | 48.48 | b | 59.82 | 65.27 | a | 61.87 | 56.09 | a | 49.29 | 32.47 | 19.15 | a | 41.51 | |||||||
1947 | 17.56 | 15.46 | a | 23.27 | 34.12 | 44.68 | 57.67 | a | 65.85 | 70.56 | 57.62 | 54.53 | 27.60 | 18.19 | d | 40.59 | ||||||||||
1948 | 8.64 | b | 13.02 | h | 23.40 | 42.71 | i | 48.92 | 59.97 | 64.65 | d | 64.85 | d | 59.86 | a | 45.73 | a | 34.93 | a | 19.94 | 43.09 | b | ||||
1949 | 18.97 | 16.55 | 23.55 | a | 42.93 | c | 52.16 | b | 65.41 | a | 67.36 | b | 65.95 | a | 53.69 | a | 48.85 | 30.40 | f | 17.37 | e | 42.98 | a | |||
1950 | 10.46 | c | 17.02 | 20.67 | a | 29.67 | a | 48.69 | 61.12 | 62.76 | 58.18 | 55.97 | a | 49.47 | 25.89 | b | 15.40 | g | 39.99 | a | ||||||
1951 | 13.92 | a | 18.10 | b | 23.20 | d | 37.92 | 56.02 | 58.09 | a | 64.87 | 59.63 | 52.58 | 44.07 | a | 24.07 | 17.58 | 39.17 | ||||||||
1952 | 16.32 | a | 18.96 | a | 23.66 | 43.88 | 50.92 | 61.98 | 66.82 | 63.76 | 58.27 | 40.50 | 33.05 | a | 25.40 | 41.96 | ||||||||||
1953 | 18.71 | 19.69 | a | 28.16 | 35.72 | 51.61 | 62.67 | 65.97 | 66.81 | 56.95 | 51.69 | 36.28 | 22.74 | 43.08 | ||||||||||||
1954 | 13.69 | 26.54 | 23.45 | 39.45 | 45.48 | 64.22 | 64.73 | 63.02 | 53.62 | 44.35 | 34.38 | 21.44 | 41.20 | |||||||||||||
1955 | 16.61 | 17.16 | 23.02 | 46.40 | 56.77 | 63.05 | 71.39 | 69.11 | 56.35 | 48.74 | 27.77 | 15.77 | 42.68 | |||||||||||||
1956 | 18.71 | 18.48 | 21.77 | 35.73 | 49.16 | 64.07 | 61.89 | 63.97 | 52.19 | a | 51.63 | 31.78 | 21.34 | 40.89 | ||||||||||||
1957 | 8.65 | 17.45 | 25.11 | 41.02 | 50.58 | 61.35 | 67.40 | 64.00 | 54.55 | 45.65 | 30.98 | 20.05 | i | 42.43 | a | |||||||||||
1958 | 18.92 | 14.55 | 27.47 | 42.43 | a | 48.56 | 55.93 | 64.21 | 62.53 | 57.20 | 47.52 | 33.75 | 11.47 | 40.38 | ||||||||||||
1959 | 9.52 | a | 13.02 | 24.74 | 38.72 | 55.35 | 63.85 | 66.48 | 67.26 | 57.43 | 41.18 | 23.02 | 25.65 | 40.52 | ||||||||||||
1960 | 17.71 | 18.36 | 17.23 | 40.07 | 49.48 | 59.33 | 64.11 | 65.11 | 57.07 | 46.44 | 34.68 | 17.06 | 40.55 | |||||||||||||
1961 | 13.03 | 22.02 | 28.76 | 37.57 | 49.52 | 61.17 | 65.89 | 66.29 | 58.40 | 47.32 | a | 32.42 | 18.65 | 41.75 | ||||||||||||
1962 | 11.08 | 12.18 | 27.71 | 37.65 | 55.56 | 59.80 | 62.55 | 64.08 | 52.77 | 46.76 | 33.10 | 18.47 | 40.14 | |||||||||||||
1963 | 5.73 | 8.66 | 26.50 | 41.57 | 50.58 | 63.08 | 67.84 | 62.84 | 56.43 | 55.95 | 37.20 | 14.98 | 40.95 | |||||||||||||
1964 | 22.23 | 20.38 | 23.60 | 40.88 | 56.60 | 61.72 | 68.03 | 60.42 | 54.93 | 44.87 | a | 35.10 | a | 16.87 | 42.14 | |||||||||||
1965 | 12.94 | 13.20 | 19.89 | 37.93 | h | 55.79 | 60.10 | 62.40 | 61.58 | 50.80 | 46.19 | 31.72 | 24.50 | 39.92 | a | |||||||||||
1966 | 11.90 | 19.35 | a | 30.31 | b | 35.47 | 46.42 | 63.15 | 69.92 | 63.05 | a | 56.65 | 44.08 | 28.88 | a | 20.15 | 40.78 | |||||||||
1967 | 17.29 | 10.12 | 27.58 | 39.63 | 45.82 | 61.77 | 64.58 | 61.43 | a | 57.25 | 43.73 | 28.17 | a | 21.81 | 39.93 | |||||||||||
1968 | 14.39 | 14.57 | 32.12 | a | 42.32 | 50.03 | 60.65 | 65.53 | a | 64.08 | 59.10 | 48.32 | 31.88 | 19.65 | 41.89 | |||||||||||
1969 | 17.18 | 19.55 | 22.65 | 41.40 | a | 52.82 | 54.87 | 64.65 | 69.08 | 58.07 | 43.61 | 31.21 | a | 21.05 | a | 41.34 | ||||||||||
1970 | 10.56 | 15.27 | 21.92 | 40.12 | 48.77 | 63.20 | 68.90 | 65.79 | 57.72 | 48.97 | 32.23 | 20.26 | 41.14 | |||||||||||||
1971 | 9.84 | 16.07 | 23.68 | 39.07 | 48.82 | 64.53 | 62.79 | b | 62.18 | 59.15 | 52.55 | 32.02 | 21.29 | 41.00 | ||||||||||||
1972 | 10.60 | 11.76 | 21.60 | 34.33 | a | 56.00 | 59.88 | 64.11 | 63.53 | 53.23 | 42.45 | a | 30.00 | 15.50 | 38.58 | |||||||||||
1973 | 19.98 | 18.30 | 34.92 | 39.36 | a | 47.42 | 62.27 | 66.35 | 67.44 | 56.12 | 51.94 | 32.35 | 18.10 | 42.88 | ||||||||||||
1974 | 13.16 | 13.61 | 23.39 | 39.78 | 48.76 | 58.77 | 68.42 | a | 63.60 | 52.10 | 45.29 | 33.80 | 25.63 | 40.52 | ||||||||||||
1975 | 16.87 | 19.59 | 23.24 | 33.80 | 57.98 | a | 64.10 | a | 69.90 | 65.98 | 52.88 | 48.24 | 35.75 | 19.28 | a | 42.30 | ||||||||||
1976 | 11.94 | 23.03 | 26.76 | 43.43 | b | 50.42 | 65.50 | 66.68 | 66.69 | 57.70 | 40.94 | 24.87 | 11.00 | 40.75 | ||||||||||||
1977 | 5.42 | 18.09 | 33.08 | 45.85 | 61.66 | 60.30 | 69.19 | 60.03 | 55.98 | 45.24 | 31.80 | 17.29 | 42.00 | |||||||||||||
1978 | 12.58 | 12.86 | 24.03 | a | 36.14 | a | 54.47 | 59.35 | 65.02 | 65.58 | 58.58 | 46.23 | 32.40 | 16.13 | 40.28 | |||||||||||
1979 | 7.61 | 9.68 | 27.16 | 36.57 | 47.98 | 59.25 | 66.11 | 62.34 | 57.77 | 41.87 | 30.03 | 24.13 | 39.21 | |||||||||||||
1980 | 14.31 | 14.78 | 23.18 | a | 41.08 | 56.55 | 59.33 | 67.19 | 66.47 | a | 54.48 | 41.00 | 32.17 | 16.45 | 40.58 | |||||||||||
1981 | 15.53 | 21.38 | 29.52 | 41.10 | 49.90 | 61.75 | 66.20 | a | 65.50 | 52.00 | 41.03 | 36.43 | 20.89 | 41.77 | ||||||||||||
1982 | 6.18 | a | 14.26 | a | 25.37 | 35.32 | 56.66 | 55.48 | 66.98 | 61.90 | 55.87 | 47.32 | 31.40 | 24.52 | a | 40.11 | ||||||||||
1983 | 19.19 | 24.66 | 28.47 | 36.20 | 46.79 | 61.97 | a | 71.88 | a | 69.47 | b | 59.52 | 45.68 | 33.17 | 10.42 | a | 42.28 | |||||||||
1984 | 10.60 | 26.62 | 19.79 | 42.33 | 50.62 | a | 64.13 | 65.44 | 67.52 | a | 55.83 | j | 46.25 | k | 32.38 | a | 19.52 | b | 39.89 | b | ||||||
1985 | 12.98 | b | 13.96 | 30.72 | b | 42.07 | a | 54.14 | c | 56.36 | e | 64.14 | f | 62.15 | 55.82 | 45.93 | a | 27.98 | 11.29 | b | 37.58 | a | ||||
1986 | 16.24 | 16.20 | 29.78 | a | 45.07 | 56.40 | a | 59.28 | 68.14 | b | 61.72 | a | 55.54 | c | 44.45 | a | 28.38 | a | 23.08 | 42.02 | ||||||
1987 | 19.52 | b | 25.62 | b | 32.53 | a | 45.29 | b | 54.95 | a | 64.86 | a | 68.07 | a | 63.76 | 57.64 | a | 40.48 | a | ----- | z | ----- | z | 47.27 | b | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 13.55 | 15.47 | 24.47 | 38.70 | 51.21 | 60.93 | 65.95 | 63.76 | 55.98 | 45.39 | 31.02 | 18.95 | 40.63 | |||||||||||||
S.D. | 4.96 | 5.14 | 4.81 | 3.99 | 3.86 | 3.22 | 2.58 | 2.83 | 2.88 | 3.98 | 3.55 | 4.31 | 1.49 | |||||||||||||
SKEW | -0.49 | -0.29 | 0.26 | 0.18 | 0.15 | -0.06 | 0.36 | -0.02 | -0.06 | 0.21 | -0.30 | -0.00 | -0.37 | |||||||||||||
MAX | 24.50 | 26.62 | 36.63 | 47.58 | 61.66 | 69.11 | 73.00 | 70.56 | 63.50 | 55.95 | 38.65 | 28.14 | 44.56 | |||||||||||||
MIN | -4.25 | 2.04 | 13.42 | 29.67 | 42.98 | 54.03 | 60.79 | 57.45 | 47.91 | 34.21 | 23.02 | 9.00 | 35.55 | |||||||||||||
YRS | 85 | 84 | 85 | 84 | 85 | 86 | 83 | 85 | 87 | 87 | 83 | 77 | 66 |