YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1915 | ----- | z | 33.80 | m | 43.39 | 51.40 | d | 55.20 | d | 59.83 | 70.82 | q | 71.13 | a | 56.23 | 49.82 | 29.58 | ----- | z | 52.08 | d | |||||
1916 | ----- | z | 27.07 | 38.05 | 47.10 | 51.52 | 60.07 | b | 63.10 | 65.25 | a | 58.82 | 44.65 | 33.79 | k | 18.38 | a | 47.40 | b | |||||||
1917 | 19.00 | a | 24.82 | 30.24 | 43.62 | 53.23 | 57.92 | 67.35 | 67.31 | 57.37 | 48.87 | 37.68 | 28.47 | a | 44.66 | |||||||||||
1918 | 27.63 | e | 25.86 | 39.47 | 47.28 | 51.18 | 62.83 | 68.66 | 62.76 | 62.67 | 49.10 | ----- | z | ----- | z | 49.74 | b | |||||||||
1919 | 30.83 | g | 27.82 | 36.98 | b | 46.70 | 54.84 | 57.50 | 67.73 | 65.16 | ----- | z | 38.08 | e | 32.00 | 18.91 | b | 44.57 | b | |||||||
1920 | 19.83 | b | 30.57 | 38.81 | 44.05 | a | 51.18 | 58.92 | 70.56 | 66.66 | b | 57.68 | 45.90 | a | 37.05 | a | 31.10 | 46.03 | ||||||||
1921 | 26.24 | 29.63 | b | 40.33 | a | 43.24 | a | 54.52 | 63.72 | a | 65.60 | 65.82 | 52.32 | 47.95 | 32.02 | 23.47 | 45.41 | |||||||||
1922 | 13.60 | a | 17.05 | 32.60 | 44.25 | 52.34 | 65.47 | 68.94 | 67.05 | 59.40 | 49.61 | 33.84 | a | 17.83 | b | 43.50 | ||||||||||
1923 | 28.35 | 21.52 | 37.79 | 47.43 | 54.00 | 61.03 | 69.50 | 67.89 | 59.52 | 48.40 | a | 35.15 | 27.34 | 46.49 | ||||||||||||
1924 | 17.92 | a | 37.76 | 39.58 | 46.16 | b | 60.26 | 62.21 | a | 69.35 | 65.97 | 59.35 | 47.53 | 33.83 | a | 24.20 | d | 47.01 | ||||||||
1925 | 24.00 | 36.20 | 41.24 | 50.67 | 58.23 | a | 63.32 | 71.92 | 65.60 | 57.68 | 46.03 | 33.80 | h | 33.84 | 49.88 | a | ||||||||||
1926 | 27.31 | 37.02 | 44.87 | 50.32 | p | 53.33 | v | 64.67 | a | ----- | z | 64.97 | b | 51.58 | 47.37 | a | 37.14 | b | 26.87 | e | 44.64 | c | ||||
1927 | 22.64 | f | 29.08 | b | 36.97 | b | 45.22 | a | 51.67 | a | 63.18 | 67.65 | 67.00 | 56.30 | 47.71 | 36.20 | 22.17 | j | 50.10 | b | ||||||
1928 | 24.48 | d | 31.10 | 41.27 | 44.65 | 58.76 | 62.47 | a | 70.16 | 65.66 | 58.97 | a | 45.95 | a | 35.41 | a | 26.78 | b | 47.14 | |||||||
1929 | 13.38 | c | 15.63 | a | 40.30 | d | 43.87 | 55.32 | a | 61.98 | 66.89 | 68.16 | 56.35 | 49.11 | 30.57 | 27.72 | a | 44.11 | ||||||||
1930 | 7.04 | f | 32.63 | a | 41.32 | 51.52 | 55.82 | a | 60.35 | 69.66 | 70.31 | 59.73 | 45.66 | 33.37 | d | 25.90 | 49.66 | a | ||||||||
1931 | 29.57 | h | 26.52 | b | 40.09 | c | 48.58 | 58.19 | 62.37 | 69.13 | 66.52 | 57.16 | a | 48.34 | b | 31.38 | a | 26.19 | d | 48.59 | a | |||||
1932 | 19.66 | 24.23 | a | 37.45 | 48.07 | a | 55.19 | 64.98 | a | 63.60 | a | 67.39 | 57.83 | c | 48.35 | a | 40.30 | b | 23.69 | b | 45.90 | |||||
1933 | 26.55 | a | 21.46 | d | 37.94 | 46.47 | a | 50.82 | 60.25 | 66.63 | 66.85 | a | 54.78 | 48.62 | a | 36.17 | 33.68 | a | 45.85 | |||||||
1934 | 32.48 | 35.57 | 43.05 | c | 55.38 | 57.50 | a | 63.33 | 67.66 | 69.23 | 54.72 | 49.55 | 40.64 | a | 28.16 | b | 49.77 | |||||||||
1935 | 25.11 | 32.96 | 37.23 | 45.07 | a | 55.03 | a | 60.92 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 42.72 | f | ||||
1936 | 26.46 | c | 11.96 | d | 36.90 | 50.95 | 63.10 | 64.00 | 67.48 | 66.94 | 57.88 | 50.92 | 30.13 | c | 32.43 | a | 46.60 | |||||||||
1937 | 5.05 | a | 20.25 | b | 37.76 | b | 43.40 | a | ----- | z | 63.91 | b | 68.98 | 65.60 | a | 60.53 | 52.95 | 36.30 | b | 34.53 | b | 44.48 | a | |||
1938 | 32.41 | b | 31.82 | 38.15 | 51.08 | 55.76 | 64.64 | a | 72.13 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 49.43 | e | ||||
1939 | 34.35 | 27.22 | a | 39.22 | a | 48.87 | 58.80 | a | 60.18 | 69.29 | 69.00 | 59.93 | a | 49.38 | c | 35.78 | 36.58 | 49.05 | ||||||||
1940 | 27.62 | a | 31.66 | 43.60 | 50.26 | a | 59.13 | 65.32 | 69.90 | 67.65 | 64.30 | 52.48 | f | 31.43 | b | 29.47 | a | 49.12 | a | |||||||
1941 | 30.21 | 34.13 | b | 45.58 | 50.91 | a | 54.53 | b | 62.47 | 71.97 | 67.67 | a | 54.22 | 48.16 | 39.93 | 34.61 | 49.53 | |||||||||
1942 | 22.42 | 32.74 | a | 39.81 | 49.36 | b | 53.21 | 60.48 | c | 69.85 | 69.23 | 61.37 | 49.65 | 31.88 | d | 27.61 | 47.30 | |||||||||
1943 | 17.30 | c | 30.20 | a | 35.86 | c | 50.45 | b | 50.40 | a | 59.00 | 67.47 | 66.91 | c | 64.05 | 64.14 | t | 36.52 | 28.03 | b | 46.02 | a | ||||
1944 | 23.94 | f | 30.00 | e | 37.59 | c | 50.21 | d | 57.73 | ----- | z | 71.88 | a | 67.97 | b | 64.63 | d | 53.21 | 45.25 | x | 23.27 | g | 54.15 | d | ||
1945 | 29.52 | 34.59 | 39.14 | b | 43.70 | j | 57.03 | b | 60.39 | l | 75.29 | g | 74.15 | g | 58.15 | c | 50.61 | c | 34.15 | g | 29.43 | b | 42.64 | e | ||
1946 | 27.19 | 30.16 | 40.43 | c | 47.21 | i | 58.30 | c | 60.41 | n | 71.26 | b | 70.70 | a | 58.81 | n | 44.73 | k | 31.12 | d | 28.78 | d | 44.74 | d | ||
1947 | 22.88 | c | 32.98 | b | 42.77 | e | 48.59 | c | 60.73 | c | 61.50 | b | 75.63 | l | ----- | z | ----- | z | 51.04 | d | 35.85 | c | 28.50 | b | 42.76 | c |
1948 | 25.44 | d | 27.87 | c | 35.71 | g | 43.90 | f | 46.94 | m | 64.95 | 63.68 | c | 63.65 | 58.21 | d | 47.16 | b | 35.18 | e | 19.13 | 45.03 | c | |||
1949 | 6.53 | 22.96 | 39.67 | b | 50.29 | b | 57.79 | c | 60.97 | a | 66.35 | 66.44 | 60.22 | e | 44.48 | g | 41.00 | a | 26.72 | b | 45.36 | a | ||||
1950 | 5.90 | 27.14 | 36.53 | a | 44.25 | b | 51.58 | a | 60.47 | a | 68.08 | a | 66.98 | 60.57 | a | 46.16 | b | 35.61 | c | 30.69 | e | 44.50 | ||||
1951 | 24.43 | d | 29.17 | a | 31.54 | c | 46.75 | b | 56.00 | a | 60.53 | 69.03 | a | 66.47 | b | 59.72 | 46.71 | c | 34.75 | b | 23.52 | d | 45.72 | |||
1952 | 19.18 | f | 27.48 | 35.77 | 48.84 | a | 54.37 | 60.70 | 69.27 | a | 67.82 | 62.07 | 51.61 | 34.92 | e | 30.38 | e | 49.39 | a | |||||||
1953 | 36.03 | 36.43 | 41.96 | d | 46.62 | 53.32 | a | 57.60 | 68.73 | r | 67.28 | f | 60.15 | 49.93 | c | 40.00 | f | 33.42 | l | 47.75 | d | |||||
1954 | 24.33 | a | 34.48 | c | 37.56 | e | 44.78 | 55.68 | c | 58.47 | 67.10 | a | 64.77 | a | 56.82 | b | 44.92 | m | 41.43 | 27.96 | h | 48.54 | b | |||
1955 | 26.32 | 25.48 | d | 31.44 | 42.76 | i | 51.83 | b | 62.98 | b | 67.03 | a | 66.52 | 59.85 | 47.48 | b | 28.30 | 23.26 | 44.59 | a | ||||||
1956 | 26.80 | a | 21.70 | a | 34.92 | 50.07 | 58.29 | 59.68 | 69.60 | a | 67.85 | 59.13 | 46.54 | e | 29.37 | d | 28.71 | c | 46.06 | |||||||
1957 | 11.03 | 25.06 | j | 38.89 | 48.81 | a | 59.95 | 61.85 | 64.61 | 62.53 | 61.97 | 47.29 | 35.12 | 32.45 | a | 47.68 | a | |||||||||
1958 | 32.08 | 40.00 | 40.35 | 46.63 | 60.86 | b | 65.20 | c | 71.68 | a | 69.96 | d | 55.95 | h | 47.88 | b | 33.27 | 30.10 | 48.91 | a | ||||||
1959 | 27.34 | 27.93 | 39.08 | 48.42 | 52.73 | 62.40 | d | 69.65 | a | 64.77 | a | 57.72 | 46.43 | a | 32.28 | 29.18 | 46.49 | |||||||||
1960 | 20.84 | 32.05 | 39.37 | 48.45 | 52.03 | 64.57 | 77.62 | a | 65.94 | d | 60.58 | d | 49.27 | a | 34.78 | 24.85 | 47.53 | |||||||||
1961 | 29.50 | 36.80 | 40.52 | 46.17 | a | 52.73 | a | 67.21 | b | 71.13 | 72.28 | a | 55.34 | a | 44.73 | a | 28.98 | 25.87 | 47.61 | |||||||
1962 | 20.95 | 32.89 | 37.03 | 49.95 | b | 52.18 | 61.08 | 67.80 | a | 66.06 | 61.55 | 47.92 | 39.85 | 33.76 | 47.59 | |||||||||||
1963 | 23.24 | 35.82 | 41.94 | 46.73 | 55.32 | 62.25 | 64.89 | 67.66 | 67.20 | j | 52.03 | 37.32 | 26.58 | 46.71 | a | |||||||||||
1964 | 27.90 | 28.98 | 36.37 | 45.00 | 54.00 | a | 62.71 | d | 69.19 | 64.07 | a | 55.57 | c | 48.72 | a | 35.14 | i | 23.19 | g | 49.25 | b | |||||
1965 | 27.32 | f | 30.02 | b | 35.13 | 49.24 | g | 54.45 | c | 62.98 | 69.61 | 69.47 | 56.56 | c | 50.46 | f | 40.42 | 30.27 | a | 49.88 | c | |||||
1966 | 24.62 | k | 31.21 | i | 39.71 | 47.32 | h | 58.39 | m | 60.84 | b | 65.91 | c | 68.68 | 64.98 | c | 47.47 | n | 38.66 | h | 32.75 | c | 55.48 | f | ||
1967 | 33.56 | g | 37.56 | b | 39.48 | d | 44.52 | g | 54.44 | d | 66.29 | a | 69.60 | a | 73.02 | a | 66.22 | 49.20 | k | 38.25 | h | 24.87 | e | 53.93 | d | |
1968 | 27.24 | b | 35.26 | 42.63 | e | 45.71 | k | 55.33 | j | 62.29 | d | 70.89 | c | 64.93 | d | 61.00 | a | 46.47 | b | 37.68 | 28.73 | g | 49.82 | c | ||
1969 | 14.12 | a | 25.55 | 36.24 | d | 47.38 | i | 58.13 | p | 68.23 | h | 67.47 | a | 65.60 | a | 61.83 | a | 47.65 | n | 38.50 | s | 30.50 | l | 45.13 | f | |
1970 | 25.62 | k | 33.39 | i | 38.33 | m | 44.70 | j | 56.03 | n | 67.17 | f | 70.85 | d | 68.47 | a | 53.83 | g | 42.19 | r | 28.50 | n | 24.35 | 54.56 | i | |
1971 | 27.05 | a | 33.09 | a | 37.52 | ----- | z | ----- | z | 62.94 | e | 70.42 | a | 73.75 | a | ----- | z | 42.80 | u | 35.58 | d | 22.38 | a | 45.34 | d | |
1972 | 21.39 | 30.16 | 41.42 | 43.28 | 58.17 | a | 66.29 | i | 68.00 | b | 73.27 | i | 55.29 | f | 45.03 | n | 35.87 | c | 21.47 | m | 42.61 | e | ||||
1973 | 25.45 | j | 31.24 | e | 41.65 | g | 47.08 | l | 57.38 | j | 63.03 | a | 69.48 | 66.81 | 59.02 | b | 46.35 | k | 35.58 | l | 34.28 | o | 57.92 | g | ||
1974 | 24.78 | m | 36.56 | l | 40.69 | j | 49.50 | g | 53.27 | a | 66.54 | g | 67.26 | d | 68.69 | 61.57 | 49.13 | a | 38.81 | l | 33.18 | n | 59.98 | g | ||
1975 | 23.70 | k | 26.19 | j | 33.50 | k | 43.60 | i | 54.98 | f | 60.83 | a | 72.94 | 65.10 | 60.76 | a | 49.06 | 37.02 | f | 29.26 | l | 61.74 | g | |||
1976 | 28.27 | a | 32.93 | a | 36.26 | h | 47.83 | f | 54.67 | b | 59.23 | f | 68.52 | 64.79 | 62.85 | 48.47 | b | 39.58 | l | 29.25 | s | 51.50 | e | |||
1977 | 20.97 | m | 34.12 | k | 40.10 | k | 50.66 | k | 53.94 | d | 65.63 | c | 68.45 | b | 73.60 | 57.84 | b | 46.94 | n | 37.42 | q | 31.07 | p | 63.89 | g | |
1978 | 28.18 | n | 33.16 | l | 42.68 | i | 49.60 | j | 54.03 | a | 63.82 | 70.67 | b | 67.05 | 58.28 | a | ----- | z | 31.75 | 23.08 | g | 57.60 | f | |||
1979 | 13.95 | c | 28.24 | a | 41.33 | g | 47.29 | b | ----- | z | 64.33 | 72.13 | 70.42 | e | 63.39 | b | 50.81 | d | 31.85 | 34.00 | d | 47.64 | b | |||
1980 | 20.29 | e | 30.71 | 38.75 | a | 51.88 | a | 55.97 | a | 59.43 | 67.43 | c | 64.92 | 57.89 | b | 50.68 | l | 40.77 | q | 30.00 | n | 49.70 | c | |||
1981 | 34.38 | n | 32.97 | m | 42.33 | m | 45.45 | i | 55.02 | i | 56.84 | b | 65.44 | 71.21 | c | 57.80 | 45.06 | f | 36.93 | a | 27.00 | a | 52.54 | f | ||
1982 | 21.62 | b | 30.23 | b | 38.10 | a | 40.45 | a | 53.67 | d | 66.33 | a | 66.90 | a | 68.40 | 59.14 | a | 46.69 | b | 31.67 | c | 28.17 | h | 47.56 | a | |
1983 | 32.72 | m | 35.90 | h | 42.94 | f | 45.73 | j | 57.48 | h | 61.93 | b | 64.42 | 70.08 | 56.75 | 48.84 | 40.85 | c | 18.77 | i | 57.14 | f | ||||
1984 | 28.23 | k | 33.82 | j | 42.86 | i | 44.82 | k | 50.36 | f | 59.65 | c | 67.78 | b | 68.98 | 55.96 | b | 43.89 | c | 36.31 | c | 17.64 | i | 55.43 | f | |
1985 | 20.12 | j | 21.74 | i | 33.72 | m | 47.29 | b | 57.14 | b | 62.27 | 74.10 | a | 65.45 | 54.87 | 46.46 | e | 23.15 | m | 18.46 | r | 58.22 | e | |||
1986 | 27.12 | n | 27.92 | i | 42.47 | m | 46.55 | j | 53.55 | j | 66.13 | c | 65.05 | a | 72.57 | b | 56.98 | c | 50.50 | c | 37.72 | l | 27.32 | l | 62.25 | g |
1987 | 26.19 | o | 34.94 | j | 43.75 | g | 52.66 | h | 58.13 | l | 65.52 | c | 68.37 | a | 67.68 | a | 63.50 | b | 50.94 | f | 40.85 | q | 27.89 | m | 66.27 | h |
1988 | 25.64 | m | 32.00 | k | 40.65 | h | 51.68 | k | 54.48 | k | 62.69 | f | 68.95 | 69.19 | 61.77 | f | 50.75 | m | 38.91 | n | 27.97 | m | 69.07 | j | ||
1989 | 28.40 | k | 23.40 | m | 38.02 | k | 50.18 | k | 54.02 | i | 65.62 | a | 69.30 | a | 66.76 | b | 60.42 | e | 47.29 | l | 38.65 | q | 29.07 | x | 65.52 | h |
1990 | 32.03 | m | 27.38 | l | 41.74 | l | 51.45 | k | 54.57 | i | 59.53 | n | ----- | z | 70.53 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1991 | 24.92 | s | 43.14 | q | 39.30 | p | 52.28 | n | 55.93 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 23.27 | 29.57 | 38.75 | 47.54 | 55.30 | 62.26 | 68.71 | 67.50 | 59.07 | 48.16 | 34.95 | 27.78 | 46.54 | |||||||||||||
S.D. | 7.10 | 5.64 | 3.10 | 2.93 | 2.92 | 2.42 | 2.56 | 2.46 | 3.03 | 2.47 | 3.45 | 4.45 | 1.64 | |||||||||||||
SKEW | -0.83 | -0.82 | -0.43 | 0.06 | 0.46 | -0.11 | 0.34 | 0.58 | 0.04 | -1.05 | 0.08 | -0.28 | 0.23 | |||||||||||||
MAX | 36.03 | 40.00 | 45.58 | 55.38 | 63.10 | 67.21 | 77.62 | 73.75 | 66.22 | 53.21 | 41.43 | 36.58 | 49.77 | |||||||||||||
MIN | 5.05 | 11.96 | 30.24 | 40.45 | 50.40 | 56.84 | 63.10 | 62.53 | 51.58 | 38.08 | 28.30 | 17.83 | 43.50 | |||||||||||||
YRS | 50 | 59 | 58 | 50 | 57 | 66 | 69 | 69 | 64 | 53 | 51 | 48 | 22 |