YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1893 | 32.33 | a | 28.96 | a | 32.13 | a | 33.97 | 41.32 | 49.30 | 54.13 | 55.87 | 41.50 | 35.29 | 31.53 | 30.60 | a | 38.91 | |||||||||
1894 | 23.65 | 23.11 | i | 30.63 | a | 36.80 | 42.35 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 33.36 | h | |||
1895 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1896 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1897 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1898 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1899 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1900 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1901 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1902 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1903 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1904 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1905 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1906 | ----- | z | ----- | z | ----- | z | 48.85 | d | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 48.85 | k |
1907 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1908 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1909 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1910 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1911 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1912 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1913 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1914 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1915 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1918 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 53.17 | 51.97 | 52.16 | 43.80 | ----- | z | ----- | z | ----- | z | 50.27 | h | ||||
1919 | 21.52 | 27.93 | 32.71 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.38 | i | |||
1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
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 | 30.71 | ----- | z | ----- | z | 42.33 | 46.39 | 56.10 | 57.74 | 52.81 | 41.23 | 37.13 | 35.80 | 26.23 | 42.65 | b | ||||||||||
1927 | 28.55 | 33.89 | 30.39 | 36.50 | 40.52 | b | 48.10 | 53.68 | 50.42 | 41.80 | 38.00 | 34.77 | 26.07 | a | 38.56 | |||||||||||
1928 | 25.35 | 30.55 | 34.16 | 35.47 | 44.13 | 51.40 | 52.94 | 53.26 | 44.90 | 34.74 | 32.23 | 28.68 | 38.98 | |||||||||||||
1929 | ----- | z | 25.79 | 30.77 | 33.89 | b | 42.94 | 50.07 | 56.97 | 55.23 | 46.37 | 36.48 | 29.67 | 33.74 | 40.17 | a | ||||||||||
1930 | 29.65 | 33.39 | 34.16 | 39.97 | 38.90 | 50.73 | 56.29 | 53.39 | 42.43 | 35.19 | 34.30 | 27.45 | 39.65 | |||||||||||||
1931 | 31.58 | 35.29 | 34.00 | 40.57 | 46.29 | 51.93 | 62.23 | 58.55 | 45.83 | 41.32 | 30.31 | a | 29.70 | a | 42.30 | |||||||||||
1932 | 26.03 | a | 30.79 | 35.03 | a | 34.66 | a | 43.45 | 48.10 | 54.55 | 50.45 | 45.87 | 41.90 | 37.97 | 25.26 | 39.51 | ||||||||||
1933 | 25.55 | 25.61 | 31.32 | 35.33 | 38.71 | 48.93 | 58.19 | 55.19 | 46.00 | 42.55 | 37.17 | 30.71 | 39.61 | |||||||||||||
1934 | 31.35 | 37.00 | 39.42 | ----- | z | 46.77 | 48.47 | 58.68 | 56.84 | 48.30 | 40.74 | 34.87 | 33.35 | 43.25 | a | |||||||||||
1935 | 31.43 | a | 34.71 | 29.16 | 37.33 | 40.53 | a | 53.80 | 53.55 | 53.90 | 47.73 | 39.97 | 30.67 | 31.94 | 40.39 | |||||||||||
1936 | 31.74 | 31.97 | 33.53 | a | 37.33 | ----- | z | ----- | z | ----- | z | ----- | z | 49.77 | 39.63 | a | 35.43 | 28.71 | 36.01 | d | ||||||
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 | 24.81 | j | 30.57 | 29.10 | 34.70 | 43.74 | 50.27 | 58.97 | 53.45 | 49.03 | 43.45 | 33.37 | 31.03 | 41.61 | a | |||||||||||
1946 | 26.61 | 26.67 | a | 32.27 | a | 37.60 | 44.32 | i | 61.97 | 58.24 | j | 51.37 | d | 34.34 | a | 35.39 | 30.23 | 32.81 | 36.93 | b | ||||||
1947 | 25.65 | 32.89 | 35.39 | 38.53 | 46.26 | 47.47 | 48.77 | 48.03 | 46.83 | 40.03 | 27.77 | 28.81 | 38.87 | |||||||||||||
1948 | 27.90 | 25.59 | 28.97 | 36.23 | 39.48 | 49.17 | 51.30 | a | 47.16 | 42.13 | 38.81 | 31.00 | 27.32 | 37.09 | ||||||||||||
1949 | 17.97 | 24.54 | 32.29 | 39.37 | 43.71 | 53.10 | 54.13 | 50.06 | 47.27 | 36.84 | 37.87 | 28.16 | 38.77 | |||||||||||||
1950 | 25.77 | 33.50 | 32.90 | a | 38.20 | 43.06 | 48.70 | 57.32 | 52.61 | 47.38 | a | 40.94 | 37.30 | 34.71 | 41.03 | |||||||||||
1951 | 29.52 | 29.57 | 29.94 | 37.75 | b | 43.19 | 50.50 | b | 54.81 | 52.71 | 47.43 | 41.10 | 34.40 | 28.97 | 39.99 | |||||||||||
1952 | 26.42 | 31.83 | 29.58 | 37.33 | 48.06 | 44.90 | 55.00 | 52.71 | 49.26 | g | 40.68 | 30.93 | 31.00 | 38.95 | a | |||||||||||
1953 | 34.00 | 27.18 | 29.93 | a | 35.97 | 37.10 | 43.00 | i | 46.79 | l | 50.17 | h | 46.70 | 38.39 | 36.17 | 29.68 | 35.01 | c | ||||||||
1954 | 28.87 | 33.07 | 31.10 | 40.13 | 46.77 | 48.40 | 58.10 | 52.13 | 46.00 | 38.16 | 35.53 | 30.68 | 40.75 | |||||||||||||
1955 | 26.81 | 27.61 | 30.97 | 32.80 | 41.42 | 49.37 | 53.16 | 55.35 | 46.37 | 40.32 | 33.00 | 34.06 | 39.27 | |||||||||||||
1956 | 33.16 | 25.66 | 32.06 | 36.37 | 42.48 | 49.33 | 54.81 | 50.45 | 46.13 | 37.90 | 33.37 | 30.68 | 39.37 | |||||||||||||
1957 | 25.94 | 37.79 | 35.26 | 37.47 | 40.74 | 50.57 | 53.84 | 52.23 | 47.40 | 41.10 | a | 32.27 | 32.94 | 40.63 | ||||||||||||
1958 | 31.71 | 36.11 | 31.84 | 37.87 | 43.52 | 48.23 | 56.68 | 57.23 | 48.63 | 43.29 | 32.60 | 33.94 | 41.80 | |||||||||||||
1959 | 31.07 | a | 28.75 | 35.35 | 40.33 | f | 41.16 | 52.30 | 60.48 | 55.33 | g | 49.30 | 42.29 | 35.00 | 32.06 | 40.78 | b | |||||||||
1960 | 27.52 | 30.61 | a | 35.73 | a | 37.07 | 41.32 | 56.17 | 60.19 | 54.03 | 50.03 | 38.19 | 33.40 | 29.16 | 41.12 | |||||||||||
1961 | 30.42 | 31.25 | 33.71 | 36.00 | 40.61 | 56.60 | 59.68 | 57.52 | 46.27 | 40.97 | 30.87 | 29.97 | b | 41.15 | ||||||||||||
1962 | 29.45 | 31.71 | 31.10 | 39.80 | 39.84 | 50.60 | 56.23 | 52.35 | 46.23 | 39.30 | a | 33.03 | 30.84 | 40.04 | ||||||||||||
1963 | 26.68 | 36.19 | a | 31.61 | 33.27 | 45.84 | 49.90 | 54.68 | 53.58 | 52.27 | 43.39 | 35.60 | 30.06 | 41.09 | ||||||||||||
1964 | 26.48 | 25.59 | 28.94 | 33.83 | 42.11 | d | 48.93 | a | 56.87 | 56.19 | 45.37 | 44.16 | 33.27 | 33.19 | 39.58 | |||||||||||
1965 | 32.06 | 30.04 | 34.17 | b | 34.48 | a | 41.81 | 45.71 | b | 55.68 | 56.77 | 43.93 | b | 40.68 | 36.24 | a | 30.68 | 40.19 | ||||||||
1966 | 27.65 | 27.96 | 34.45 | 39.10 | 45.23 | a | 50.97 | 56.81 | 56.94 | 48.31 | a | 39.23 | 35.20 | 31.19 | 41.09 | |||||||||||
1967 | 30.29 | 29.61 | 32.87 | 30.20 | 43.06 | 48.00 | a | 60.58 | 59.16 | 51.17 | 41.52 | 38.73 | 26.87 | a | 41.00 | |||||||||||
1968 | 27.33 | a | 37.45 | 32.94 | 34.93 | ----- | z | ----- | z | 59.56 | v | 49.83 | m | 47.04 | c | 40.29 | 33.24 | a | 26.74 | 35.00 | d | |||||
1969 | 31.06 | 29.82 | 30.74 | 35.45 | a | 46.29 | 51.96 | b | 57.43 | a | 55.71 | 49.90 | 37.97 | 37.90 | 29.16 | 41.12 | ||||||||||
1970 | 32.06 | 33.96 | c | 33.17 | a | 32.69 | a | 44.13 | a | 50.90 | a | 59.00 | a | 55.77 | a | 48.23 | 41.81 | j | 32.63 | 28.42 | 41.00 | a | ||||
1971 | 28.35 | 28.57 | 33.52 | 34.40 | 40.70 | a | 51.13 | 59.90 | 58.77 | 50.33 | 36.03 | 32.83 | 24.94 | 39.96 | ||||||||||||
1972 | 26.42 | 31.03 | 36.94 | 37.77 | 44.80 | a | 52.72 | a | 58.97 | 56.48 | 49.17 | 39.35 | 33.33 | 26.77 | 41.15 | |||||||||||
1973 | 28.71 | 33.36 | 31.29 | 37.47 | 47.23 | 52.87 | 56.74 | 56.39 | 48.13 | 39.77 | 35.07 | 32.68 | 41.64 | |||||||||||||
1974 | 29.58 | 29.89 | 35.13 | 35.23 | 41.84 | 50.60 | 57.16 | 55.74 | 52.63 | 44.13 | a | 35.63 | 27.94 | 41.29 | ||||||||||||
1975 | 29.35 | 29.21 | 31.90 | 31.17 | 43.03 | 52.47 | 56.65 | 53.23 | 52.43 | 39.74 | 34.60 | 32.42 | 40.52 | |||||||||||||
1976 | 30.87 | 34.55 | g | 32.00 | b | 34.20 | 46.55 | 50.00 | 58.90 | 50.55 | 50.60 | 41.42 | 38.47 | 30.52 | 42.19 | a | ||||||||||
1977 | 30.10 | 32.43 | 29.03 | 38.53 | 40.35 | 55.83 | 58.29 | 57.77 | 49.40 | 41.61 | 34.57 | 36.26 | 42.02 | |||||||||||||
1978 | 34.32 | 33.93 | 39.77 | 36.93 | 43.47 | a | 53.27 | 57.10 | 55.52 | 48.13 | 43.94 | 31.40 | 27.19 | 42.08 | ||||||||||||
1979 | 28.74 | 28.61 | 34.94 | 35.83 | 45.77 | 52.00 | 57.23 | 55.77 | 52.47 | 44.97 | 34.33 | 34.68 | 42.11 | |||||||||||||
1980 | 37.58 | 36.00 | a | 33.45 | 38.73 | 41.84 | 49.57 | 58.58 | 56.90 | 48.77 | 43.13 | 35.17 | 36.17 | a | 42.99 | |||||||||||
1981 | 33.39 | 33.46 | 34.32 | 39.97 | 47.94 | 56.80 | 59.81 | 58.42 | 53.83 | 40.29 | 37.10 | 36.11 | m | 45.03 | a | |||||||||||
1982 | 27.65 | k | 31.96 | 32.21 | b | 37.57 | ----- | z | 50.20 | 56.39 | 54.84 | 48.34 | a | 39.70 | a | 33.66 | a | 29.50 | a | 41.44 | b | |||||
1983 | 32.19 | 32.96 | a | 36.57 | a | 34.24 | a | 44.77 | 51.40 | 50.52 | 55.27 | a | 53.97 | 43.29 | 36.48 | a | 33.87 | a | 42.13 | |||||||
1984 | 34.29 | 31.52 | 36.61 | 35.57 | 47.26 | 51.83 | 60.52 | 58.23 | 53.63 | 38.84 | 35.13 | 28.42 | 42.65 | |||||||||||||
1985 | 31.06 | 30.96 | 30.97 | 39.93 | 43.52 | 53.72 | a | 61.23 | 54.26 | 47.30 | 39.65 | 33.93 | b | 33.55 | 41.67 | |||||||||||
1986 | 37.90 | 35.46 | 37.33 | a | 37.60 | 45.94 | 52.87 | 56.29 | 58.48 | 45.13 | 38.20 | a | 34.97 | 29.16 | 42.44 | |||||||||||
1987 | 27.61 | 31.46 | 34.29 | 40.64 | b | 46.32 | 53.57 | 53.55 | 55.13 | 51.00 | a | 46.03 | 36.80 | 28.19 | 42.05 | |||||||||||
1988 | 31.43 | a | 33.96 | b | 33.87 | 38.67 | 42.62 | b | 49.90 | a | 61.30 | a | 56.74 | 49.53 | 44.97 | 36.67 | 30.29 | 42.50 | ||||||||
1989 | 29.42 | 30.50 | 38.67 | a | 44.55 | a | 44.55 | 53.43 | 60.74 | 55.71 | 50.45 | a | 42.13 | 38.13 | 31.84 | 43.34 | ||||||||||
1990 | 31.30 | a | 28.82 | 37.23 | a | 43.29 | b | 44.47 | a | 52.50 | 62.17 | a | 58.58 | e | 53.21 | b | 47.10 | b | 34.96 | f | 26.87 | a | 44.14 | a | ||
1991 | 30.53 | a | 35.64 | c | 30.93 | a | 37.69 | a | 41.97 | 51.55 | a | 61.70 | a | 56.83 | b | 54.93 | b | 47.17 | b | 36.34 | a | 33.80 | a | 43.26 | ||
1992 | 30.10 | a | 37.38 | 38.03 | a | 43.10 | 50.23 | a | 52.25 | b | 58.29 | 60.59 | b | 52.47 | 46.71 | c | 36.87 | 27.94 | 44.50 | |||||||
1993 | 30.71 | 34.25 | 38.84 | 39.52 | c | 45.34 | b | 51.97 | a | 58.71 | 58.16 | 49.86 | a | 44.77 | 35.34 | a | 30.30 | a | 43.15 | |||||||
1994 | 31.23 | 31.36 | 37.29 | 40.59 | a | 46.00 | a | 54.55 | a | 62.07 | b | ----- | z | 50.47 | 40.90 | a | 30.03 | a | 30.79 | b | 41.39 | a | ||||
1995 | 34.52 | 36.61 | 35.39 | 37.81 | d | 42.07 | a | 48.62 | d | 55.79 | b | 57.21 | b | 53.07 | c | 43.90 | b | 38.57 | g | 33.21 | c | 43.47 | a | |||
1996 | 34.43 | h | 36.40 | d | 36.52 | h | 38.09 | h | 46.79 | b | 55.31 | a | 61.42 | g | 58.64 | c | 49.72 | e | 40.65 | e | 38.68 | e | 35.03 | a | 45.15 | d |
1997 | 32.30 | d | 31.41 | a | 36.88 | f | 39.81 | c | 52.32 | 52.71 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.71 | g | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 29.59 | 31.54 | 33.35 | 37.36 | 43.73 | 51.39 | 57.07 | 54.93 | 48.10 | 40.73 | 34.37 | 30.44 | 40.94 | |||||||||||||
S.D. | 3.43 | 3.40 | 2.78 | 3.18 | 2.89 | 2.88 | 3.04 | 2.90 | 3.67 | 2.97 | 2.52 | 2.76 | 1.53 | |||||||||||||
SKEW | -0.44 | -0.08 | 0.41 | 0.71 | 0.31 | 0.75 | -0.38 | -0.50 | -0.80 | 0.14 | -0.32 | 0.12 | -0.08 | |||||||||||||
MAX | 37.90 | 37.79 | 39.77 | 48.85 | 52.32 | 61.97 | 62.23 | 60.59 | 54.93 | 47.17 | 38.73 | 36.26 | 44.50 | |||||||||||||
MIN | 17.97 | 24.54 | 28.94 | 30.20 | 37.10 | 44.90 | 48.77 | 47.16 | 34.34 | 34.74 | 27.77 | 24.94 | 37.09 | |||||||||||||
YRS | 63 | 64 | 64 | 64 | 62 | 63 | 60 | 60 | 64 | 63 | 62 | 63 | 46 |