YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1905 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1906 | ----- | z | 25.39 | 29.81 | 36.33 | 43.58 | 53.37 | 56.58 | 54.26 | 47.00 | 36.16 | 27.17 | 25.21 | b | 39.53 | a | ||||||||||
1907 | 25.96 | d | 27.43 | 30.74 | 35.90 | 37.84 | 45.93 | 53.35 | 54.23 | 47.57 | 38.87 | a | 26.50 | 23.08 | f | 38.57 | a | |||||||||
1908 | 21.03 | 25.07 | 32.35 | 37.32 | b | 40.36 | f | 48.63 | 54.55 | 54.65 | 45.17 | 31.50 | a | 23.77 | 23.10 | 36.10 | a | |||||||||
1909 | 26.71 | 22.36 | 24.84 | 32.87 | 38.77 | 53.23 | 57.70 | a | 54.45 | 45.83 | 36.97 | 27.53 | 13.77 | a | 36.25 | |||||||||||
1910 | 21.45 | 19.79 | 29.84 | 34.23 | 44.16 | 53.63 | 57.26 | 56.87 | 50.50 | 34.90 | 29.60 | 20.87 | a | 37.76 | ||||||||||||
1911 | 28.19 | 23.75 | 32.48 | 36.07 | 40.45 | 50.80 | 54.58 | 54.23 | 51.80 | 36.81 | 25.10 | 13.87 | 37.34 | |||||||||||||
1912 | 21.23 | 20.66 | 29.19 | 30.41 | a | 42.68 | 51.10 | 56.32 | 53.45 | 45.00 | 35.87 | a | 25.50 | 15.32 | 35.56 | |||||||||||
1913 | 16.80 | a | 19.61 | 26.97 | 34.93 | 47.32 | 50.23 | 57.19 | 53.84 | 46.40 | 38.87 | 33.30 | 18.42 | 36.99 | ||||||||||||
1914 | 27.77 | 24.43 | 30.17 | a | 38.72 | a | 44.19 | 60.20 | 54.48 | 53.48 | 49.33 | 41.65 | 26.93 | 20.06 | 39.29 | |||||||||||
1915 | 19.42 | 25.68 | 26.84 | 34.43 | ----- | z | 58.83 | 58.23 | ----- | z | ----- | z | ----- | z | 22.62 | n | 22.48 | 35.13 | e | |||||||
1916 | 25.33 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1917 | 20.00 | g | 25.68 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.68 | k | |
1918 | ----- | z | 24.59 | f | 32.54 | g | 33.71 | i | 43.68 | c | 52.23 | q | 56.33 | j | ----- | z | 46.70 | j | 42.22 | v | 20.56 | u | 14.26 | d | 28.97 | j |
1919 | 11.91 | h | 20.52 | g | 26.95 | i | 32.24 | m | 42.58 | l | 48.91 | h | 55.73 | i | 53.92 | f | 52.62 | q | 34.70 | h | 27.19 | n | 24.05 | i | ----- | z |
1920 | 16.67 | g | 26.25 | e | 22.08 | r | 31.08 | e | 41.67 | j | 48.41 | m | ----- | z | ----- | z | 46.42 | f | 39.15 | e | 27.56 | e | 19.72 | f | 31.01 | h |
1921 | 18.29 | g | 19.74 | e | 29.48 | d | 31.46 | d | 39.17 | g | 48.96 | f | 56.22 | h | 55.44 | d | 52.00 | e | 38.27 | e | 26.75 | f | 21.80 | f | 37.73 | f |
1922 | 14.16 | f | 23.43 | e | 25.04 | d | 30.00 | g | 43.91 | h | 52.65 | d | 58.16 | f | 58.38 | e | 51.80 | e | 38.96 | e | 22.32 | e | 21.84 | f | 38.94 | e |
1923 | 19.28 | f | 22.90 | h | 24.93 | c | 35.00 | d | ----- | z | 51.52 | g | 56.67 | m | 54.04 | f | 44.37 | 34.74 | ----- | z | 20.89 | m | 34.76 | h | ||
1924 | 17.87 | 24.55 | 25.74 | 34.23 | 44.50 | a | 54.50 | 57.29 | 53.93 | a | 44.77 | 35.58 | 30.72 | a | 20.10 | 36.98 | ||||||||||
1925 | 18.86 | i | 25.43 | 30.03 | a | ----- | z | 44.60 | a | 54.53 | 58.50 | a | 53.90 | b | ----- | z | ----- | z | 25.79 | a | ----- | z | 41.83 | e | ||
1926 | 15.65 | ----- | z | 28.00 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 57.38 | v | 42.39 | 32.43 | 21.16 | 27.93 | g | ||||
1927 | 25.90 | 29.68 | 27.56 | v | 35.63 | 44.23 | e | 51.56 | c | 59.48 | b | 55.87 | a | 50.58 | d | 38.19 | 34.73 | o | 16.52 | f | 43.46 | c | ||||
1928 | 20.79 | b | 21.43 | h | 31.04 | c | 31.50 | l | 42.32 | c | 46.52 | i | 56.17 | h | ----- | z | 38.50 | x | 38.69 | r | 23.91 | s | 17.08 | f | 31.38 | i |
1929 | 20.14 | b | 19.69 | b | 27.04 | f | 29.33 | o | 41.10 | j | ----- | z | ----- | z | 46.80 | k | 44.11 | u | ----- | z | 16.21 | b | 10.43 | a | 16.62 | h |
1930 | 11.77 | 19.00 | a | 19.10 | 28.07 | a | 30.68 | 46.00 | b | 56.97 | 54.94 | 48.24 | a | 35.90 | a | 22.74 | c | 14.10 | a | 32.29 | ||||||
1931 | 14.43 | a | 26.00 | a | 27.78 | d | 37.70 | g | 43.06 | 54.17 | 57.93 | a | 55.13 | a | 52.27 | 39.84 | 21.63 | c | 14.26 | d | 36.95 | a | ||||
1932 | 13.80 | a | 27.50 | a | 26.52 | b | ----- | z | ----- | z | ----- | z | ----- | z | 59.07 | c | ----- | z | ----- | z | ----- | z | ----- | z | 31.72 | h |
1933 | 14.14 | x | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.12 | v | 13.35 | n | ----- | z |
1934 | ----- | z | ----- | z | 29.23 | 38.57 | b | 44.28 | f | 44.38 | f | 56.63 | l | 54.10 | ----- | z | ----- | z | ----- | z | ----- | z | 40.63 | i | ||
1935 | ----- | z | 27.26 | e | 33.03 | 38.60 | 42.10 | 54.00 | 60.58 | 57.39 | 49.87 | 45.97 | 35.48 | a | 20.61 | 42.26 | a | |||||||||
1936 | 19.48 | 26.72 | 29.23 | 38.10 | 46.26 | 56.63 | 58.14 | b | 58.68 | 51.86 | a | 38.35 | 28.14 | a | 27.32 | 39.91 | ||||||||||
1937 | 11.73 | a | 29.25 | 27.74 | 36.90 | a | 45.35 | 50.60 | 55.81 | 55.35 | 48.63 | 36.26 | 25.60 | 20.90 | a | 37.01 | ||||||||||
1938 | 21.65 | 25.32 | 25.39 | 32.30 | 37.42 | 48.93 | 52.61 | 52.42 | 43.77 | 34.58 | 16.37 | 18.17 | a | 34.08 | ||||||||||||
1939 | 18.45 | 18.07 | a | 30.35 | 36.43 | 47.10 | 62.00 | 57.68 | 54.71 | 51.30 | 35.58 | 24.80 | 23.48 | 38.33 | ||||||||||||
1940 | 21.84 | 24.21 | a | 29.84 | 34.52 | a | 43.35 | 54.40 | 58.58 | 55.00 | 49.77 | 38.13 | 26.03 | 28.35 | 38.67 | |||||||||||
1941 | 24.55 | 29.68 | 28.87 | 33.83 | 45.61 | 48.37 | 53.97 | 54.74 | 46.80 | 37.17 | a | 25.83 | 23.55 | 37.75 | ||||||||||||
1942 | 21.61 | 16.21 | 24.58 | 36.13 | 42.29 | 54.33 | 55.71 | 55.81 | 49.43 | 41.10 | a | 31.00 | f | 27.45 | 38.61 | a | ||||||||||
1943 | 24.61 | 26.57 | 29.42 | 37.37 | 45.74 | 53.24 | a | 57.58 | 58.16 | 50.30 | 37.30 | a | 24.40 | 18.55 | 38.60 | |||||||||||
1944 | 15.58 | 23.83 | 27.50 | a | 33.04 | c | 44.16 | 51.43 | 58.03 | 57.87 | 49.93 | 41.84 | 28.13 | 21.97 | 37.78 | |||||||||||
1945 | 22.10 | 28.61 | 26.84 | 33.20 | 46.63 | a | 50.03 | 57.84 | 56.74 | 50.20 | 37.58 | 27.50 | 19.84 | 38.09 | ||||||||||||
1946 | 18.45 | 23.21 | 30.61 | 41.87 | 42.68 | 55.73 | 57.65 | 50.74 | 53.63 | c | 36.52 | 25.11 | b | 25.35 | 38.46 | |||||||||||
1947 | 18.52 | 24.54 | 28.96 | d | 34.73 | 46.11 | d | 52.40 | 59.65 | 55.97 | 50.56 | c | 39.54 | e | 23.72 | a | 17.81 | 37.71 | ||||||||
1948 | 19.53 | a | 23.04 | a | 24.13 | a | 36.76 | a | 42.61 | 50.43 | 56.77 | a | 54.74 | 50.27 | 37.32 | 24.55 | a | 25.74 | 37.16 | |||||||
1949 | 17.83 | a | 21.85 | a | 27.43 | a | 35.10 | 41.88 | e | 51.00 | 57.26 | 54.73 | e | 50.68 | b | 34.83 | h | 29.52 | c | 18.16 | 36.86 | a | ||||
1950 | 21.53 | a | 25.56 | a | 28.58 | 36.31 | d | 43.30 | d | 53.93 | a | 57.69 | b | 58.61 | c | 47.20 | j | 43.46 | c | 26.84 | e | 24.41 | b | 38.20 | a | |
1951 | 21.20 | a | 22.58 | b | 27.19 | d | 31.96 | d | 40.87 | h | 46.44 | c | 56.10 | 54.23 | e | 42.61 | g | 36.63 | d | 25.17 | g | 21.20 | f | 37.04 | d | |
1952 | 26.23 | e | 23.59 | 24.41 | d | 36.83 | 46.40 | f | 53.87 | g | 58.84 | 65.07 | c | 55.37 | ----- | z | 24.79 | f | 22.58 | 39.11 | d | |||||
1953 | 29.18 | i | ----- | z | 28.08 | s | 33.75 | n | 44.96 | f | 62.52 | g | 68.08 | g | ----- | z | 50.04 | f | 37.18 | i | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | 24.55 | f | 28.68 | i | 39.97 | a | 45.57 | c | 55.62 | i | 58.58 | e | 53.36 | f | 49.05 | i | 39.52 | f | 26.44 | e | 15.09 | i | 42.64 | h |
1955 | 18.10 | a | 15.44 | a | 25.92 | g | 30.62 | n | 41.07 | b | 50.47 | 55.00 | c | 56.72 | m | 48.67 | l | 39.64 | f | 27.82 | m | 23.43 | j | 36.02 | g | |
1956 | 24.83 | g | 12.56 | t | 31.43 | x | 32.47 | 47.94 | n | 55.73 | 57.32 | 52.69 | o | 48.00 | j | 37.64 | q | 21.07 | b | 18.94 | 37.11 | g | ||||
1957 | 25.83 | a | 32.00 | f | 30.77 | 33.38 | a | 41.65 | e | 52.36 | b | 58.36 | c | 55.36 | f | 46.75 | j | 40.26 | d | 23.82 | s | 22.85 | k | 40.37 | e | |
1958 | 17.88 | e | 24.55 | f | 24.14 | j | 33.45 | h | 44.71 | 57.23 | 59.26 | 56.38 | g | 48.78 | c | 35.96 | h | 23.00 | h | 21.74 | h | 45.57 | g | |||
1959 | 15.58 | 21.07 | m | 23.39 | c | 36.41 | h | 44.71 | 54.93 | 57.63 | a | 55.23 | 47.63 | 36.23 | a | 23.10 | 18.06 | 37.65 | b | |||||||
1960 | 15.90 | 18.96 | a | 30.68 | 35.43 | 41.03 | 54.37 | 57.29 | 57.03 | 50.80 | 37.07 | a | 25.30 | 17.13 | 36.75 | |||||||||||
1961 | 18.63 | a | 23.11 | 28.77 | a | 34.67 | 43.37 | a | 55.14 | a | 55.19 | 53.52 | 43.57 | b | 34.53 | a | 23.90 | a | 19.50 | a | 36.16 | |||||
1962 | 17.00 | a | 21.75 | 23.19 | 35.41 | a | 42.30 | a | 49.10 | a | 52.70 | a | 49.03 | 40.93 | a | 31.81 | 21.77 | 14.13 | 33.26 | |||||||
1963 | 7.90 | 18.18 | 19.58 | 34.79 | a | 45.90 | b | 49.60 | 58.48 | 55.19 | 50.50 | 37.68 | 24.10 | 10.90 | 34.40 | |||||||||||
1964 | 10.26 | 13.83 | 25.48 | 32.73 | 42.84 | ----- | z | 55.90 | 50.26 | 48.73 | 38.16 | 24.38 | a | 21.55 | 33.10 | a | ||||||||||
1965 | 21.13 | a | 18.64 | 20.48 | 36.93 | a | 42.32 | 48.90 | 57.87 | 52.16 | 43.63 | 36.00 | 29.57 | 21.96 | d | 35.80 | ||||||||||
1966 | 12.26 | 17.57 | 25.55 | 34.47 | 43.35 | 49.97 | 50.90 | 52.48 | 49.03 | 35.00 | 29.17 | 18.06 | 34.82 | |||||||||||||
1967 | 14.43 | a | 23.19 | a | 31.19 | 34.87 | 41.97 | 50.23 | 56.84 | 53.32 | 45.73 | 38.84 | 31.14 | b | 19.06 | 36.74 | ||||||||||
1968 | 20.39 | 25.52 | 27.52 | 33.00 | 42.71 | 52.97 | 56.29 | 52.94 | 46.70 | 39.10 | 28.33 | 19.52 | 37.08 | |||||||||||||
1969 | 26.74 | 20.48 | a | 22.58 | 34.73 | 42.74 | 49.77 | 59.00 | 57.03 | 49.57 | 35.10 | 23.10 | 20.77 | 36.80 | ||||||||||||
1970 | 12.96 | h | ----- | z | 26.29 | c | 30.57 | 43.71 | 49.28 | a | 54.70 | a | 54.82 | i | 47.73 | d | 35.68 | 32.15 | d | 22.90 | j | 40.01 | d | |||
1971 | 17.61 | c | 21.96 | 31.10 | a | 32.62 | a | 39.94 | ----- | z | ----- | z | ----- | z | 46.93 | 32.35 | 26.40 | ----- | z | 31.11 | d | |||||
1972 | 12.42 | 20.03 | 30.32 | 34.62 | i | 39.35 | 47.00 | 55.45 | 54.26 | 50.13 | 42.42 | 26.67 | 18.84 | 36.08 | a | |||||||||||
1973 | 13.84 | 16.18 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.43 | 22.61 | 20.77 | h | ||||
1974 | 20.00 | 18.18 | 33.90 | 35.47 | 46.57 | a | 55.07 | a | 56.09 | h | 53.16 | 46.83 | 39.90 | 29.03 | 18.58 | e | 36.06 | a | ||||||||
1975 | 23.29 | j | 24.86 | g | 28.28 | f | 31.43 | 40.13 | 50.10 | 56.28 | b | 52.16 | 48.38 | f | 37.83 | a | 22.55 | a | 20.50 | i | 41.50 | e | ||||
1976 | 19.33 | g | 28.63 | b | 27.80 | a | 37.00 | c | 45.83 | a | 50.62 | f | 56.65 | e | 54.57 | a | 49.23 | d | 36.10 | 22.15 | c | 19.92 | f | 39.77 | c | |
1977 | 20.30 | k | 23.84 | i | 23.48 | f | 35.18 | b | 45.29 | c | 53.24 | e | 57.93 | a | 58.90 | 52.83 | 39.74 | 32.04 | b | 30.92 | f | 46.89 | d | |||
1978 | 26.38 | g | 27.45 | h | 33.31 | e | 39.00 | a | 42.44 | d | 52.50 | b | 57.43 | a | 54.36 | c | ----- | z | 42.24 | b | 31.89 | c | ----- | z | 44.15 | d |
1979 | 20.81 | d | 22.75 | 29.17 | a | 33.97 | a | 41.17 | a | 50.86 | a | 56.93 | c | 54.45 | b | 53.00 | c | 41.94 | 25.25 | b | 22.35 | e | 37.72 | |||
1980 | 28.50 | e | 27.93 | a | 28.77 | a | 32.73 | 44.26 | 54.47 | 60.06 | 57.07 | a | 51.00 | 37.13 | 25.64 | b | 25.85 | d | 39.45 | |||||||
1981 | 24.72 | b | 26.07 | a | 28.71 | 39.00 | 45.31 | b | 56.97 | a | 57.26 | 54.55 | 50.57 | 40.42 | 32.00 | b | 23.58 | e | 39.93 | |||||||
1982 | 20.44 | d | 25.00 | a | 29.17 | a | 37.47 | 43.84 | 50.93 | 58.87 | 57.55 | 51.48 | a | 35.15 | e | 31.04 | g | 23.22 | h | 40.99 | b | |||||
1983 | 23.30 | k | 24.79 | i | 30.74 | h | 31.80 | e | 40.26 | 50.73 | 58.84 | 57.19 | 54.87 | 41.56 | f | 32.17 | f | 26.61 | h | 48.95 | f | |||||
1984 | 19.29 | j | 22.65 | i | 29.64 | f | 33.60 | 48.52 | b | 50.53 | 58.10 | 56.26 | 51.27 | d | 37.77 | a | 30.38 | a | 25.00 | c | 43.49 | c | ||||
1985 | 21.27 | i | 21.42 | i | 32.90 | j | 39.61 | b | 45.40 | a | 54.38 | a | ----- | z | 57.03 | 47.18 | h | 40.68 | 33.03 | a | 23.00 | b | 41.88 | e | ||
1986 | 25.31 | o | 28.90 | h | 33.70 | k | 40.14 | b | 45.97 | a | 54.63 | c | 57.17 | a | 56.97 | a | 47.17 | l | 37.79 | l | 28.27 | o | 22.40 | p | 50.97 | g |
1987 | 20.33 | s | 25.28 | j | 26.04 | h | 34.62 | f | 42.23 | e | 51.54 | f | 56.71 | g | 55.21 | b | 48.29 | m | 40.20 | p | 25.00 | q | ----- | z | 48.72 | j |
1988 | 19.06 | m | 25.74 | j | 26.50 | o | 33.14 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 28.73 | 19.58 | e | 27.15 | i | |
1989 | 20.10 | 24.74 | a | 33.87 | 39.77 | 48.84 | 53.53 | 57.57 | a | 56.84 | 49.29 | b | 38.90 | 29.93 | a | 19.83 | b | 39.43 | ||||||||
1990 | 17.62 | j | 25.53 | i | 30.64 | i | 38.70 | 44.97 | 57.37 | 56.40 | f | 51.96 | e | 52.10 | a | 36.38 | e | 27.17 | a | 17.35 | 40.75 | d | ||||
1991 | 19.35 | 22.68 | 24.52 | 31.80 | 42.35 | 48.80 | 55.23 | 54.87 | 49.21 | a | 39.62 | b | 29.13 | g | 21.52 | 37.27 | a | |||||||||
1992 | 17.40 | k | 24.72 | 28.39 | 36.76 | a | 43.26 | 49.73 | 57.26 | 55.58 | 51.13 | 45.13 | 24.27 | 16.39 | m | 41.62 | b | |||||||||
1993 | 26.32 | l | 24.53 | i | 30.26 | l | 34.57 | i | 42.24 | n | 47.06 | n | 55.50 | g | 50.16 | 42.86 | a | 34.00 | j | ----- | z | ----- | z | 46.51 | j | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 19.55 | 23.17 | 27.95 | 35.17 | 43.29 | 52.37 | 56.97 | 55.11 | 49.03 | 37.99 | 26.63 | 20.17 | 37.10 | |||||||||||||
S.D. | 4.72 | 3.73 | 3.24 | 2.73 | 2.82 | 3.27 | 1.85 | 2.48 | 3.02 | 2.91 | 3.81 | 4.03 | 1.84 | |||||||||||||
SKEW | -0.14 | -0.41 | -0.58 | 0.07 | -1.36 | 0.41 | -0.90 | 0.66 | -0.47 | 0.36 | -0.19 | -0.27 | -0.71 | |||||||||||||
MAX | 28.50 | 29.68 | 33.90 | 41.87 | 48.84 | 62.00 | 60.58 | 65.07 | 55.37 | 45.97 | 35.48 | 28.35 | 39.93 | |||||||||||||
MIN | 7.90 | 13.83 | 19.10 | 28.07 | 30.68 | 45.93 | 50.90 | 49.03 | 40.93 | 31.50 | 16.21 | 10.43 | 32.29 | |||||||||||||
YRS | 58 | 62 | 64 | 68 | 67 | 65 | 65 | 67 | 61 | 64 | 63 | 56 | 33 |