YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1911 | ----- | z | ----- | z | ----- | z | ----- | z | 52.22 | o | 60.27 | 65.92 | 61.74 | 54.05 | 44.38 | a | 31.70 | c | 25.93 | b | 49.14 | e | ||||
1912 | 21.58 | 30.29 | 35.77 | 46.08 | 53.11 | 61.52 | 62.89 | 59.95 | 50.67 | a | 41.98 | e | 36.50 | 28.62 | b | 44.08 | ||||||||||
1913 | 19.82 | c | 17.12 | 30.31 | 45.27 | d | 56.40 | p | 58.79 | a | 62.94 | 63.05 | 53.55 | 47.27 | 40.43 | 30.60 | a | 42.65 | a | |||||||
1914 | 31.29 | 27.25 | 39.32 | 46.62 | 53.68 | 55.97 | 65.50 | 63.13 | 52.03 | 46.40 | 37.33 | 20.92 | 44.95 | |||||||||||||
1915 | 22.56 | 33.59 | 41.60 | 48.72 | 52.65 | 56.81 | a | 63.84 | 68.90 | 52.83 | 47.08 | 31.93 | 25.88 | a | 45.53 | |||||||||||
1916 | 13.52 | 29.84 | 36.95 | 44.33 | 47.40 | 56.40 | 61.31 | 62.52 | 53.82 | b | 40.69 | 28.98 | 17.85 | a | 41.14 | |||||||||||
1917 | 20.42 | 25.66 | 26.67 | a | 41.10 | a | 51.13 | 55.43 | 64.50 | 63.67 | a | 57.17 | 44.11 | 39.12 | 32.48 | 43.45 | ||||||||||
1918 | 28.32 | 27.39 | 39.00 | 45.29 | b | 49.85 | a | 61.88 | 65.08 | f | 60.64 | b | 59.34 | b | 47.67 | b | 35.24 | c | 27.21 | e | 43.80 | a | ||||
1919 | 27.66 | 28.96 | 36.45 | a | 47.37 | c | 52.30 | h | 56.06 | d | 66.82 | n | 63.74 | b | 54.18 | 38.83 | a | 31.00 | h | 20.16 | 41.49 | c | ||||
1920 | 24.74 | d | 30.31 | 36.63 | 41.69 | f | 51.98 | 58.95 | 72.10 | b | 65.24 | b | 56.88 | j | 44.63 | a | 35.52 | 30.73 | e | 45.08 | b | |||||
1921 | 27.35 | 31.46 | o | 39.27 | 44.55 | 55.53 | 63.57 | 63.39 | q | 63.68 | 50.37 | 45.13 | 37.23 | o | ----- | z | 48.68 | d | ||||||||
1922 | 16.25 | s | 20.41 | q | 31.11 | 41.57 | 52.13 | 64.38 | 66.97 | 66.68 | 58.20 | 48.31 | 32.30 | 18.47 | 48.01 | b | ||||||||||
1923 | 29.17 | a | 20.27 | 35.65 | a | 45.95 | 53.07 | a | 59.42 | 68.71 | e | 65.00 | a | 58.08 | 47.44 | 35.58 | 29.12 | a | 45.62 | |||||||
1924 | 19.98 | 37.57 | 37.61 | 45.02 | b | 57.95 | 61.00 | 67.39 | c | 63.73 | 58.34 | a | 45.82 | 33.84 | a | 21.87 | 45.84 | |||||||||
1925 | 27.45 | 37.04 | 39.95 | 49.72 | a | 56.90 | 62.40 | 69.05 | 64.61 | 57.23 | 42.44 | 34.67 | 35.06 | 48.04 | ||||||||||||
1926 | 28.63 | 35.73 | 41.97 | 50.78 | 53.79 | 61.25 | 68.89 | 63.55 | 51.15 | 47.72 | a | 38.00 | 27.61 | 47.42 | ||||||||||||
1927 | 25.53 | 32.16 | 38.22 | a | 44.59 | a | 50.90 | a | 61.75 | 66.13 | 65.63 | a | 55.17 | 47.19 | 36.46 | b | 18.07 | c | 45.15 | |||||||
1928 | 27.30 | a | 28.03 | 40.31 | 43.88 | 58.10 | a | 60.02 | 67.97 | 63.00 | 56.72 | 46.68 | 34.78 | 26.39 | 46.10 | |||||||||||
1929 | 13.85 | a | 18.02 | 39.05 | 42.62 | 53.63 | 58.57 | 63.81 | 66.91 | b | 54.03 | 46.47 | a | 29.95 | 32.00 | 43.24 | ||||||||||
1930 | 14.84 | 34.57 | 40.13 | 50.48 | 52.74 | 57.50 | 66.82 | 67.23 | 58.10 | 44.06 | 33.32 | 26.45 | 45.52 | |||||||||||||
1931 | 31.10 | 30.12 | 39.58 | 46.82 | 56.67 | b | 60.16 | a | 66.77 | 65.03 | 56.00 | 44.95 | 31.17 | 25.87 | 46.19 | |||||||||||
1932 | 22.94 | 25.16 | 35.11 | 47.20 | 53.06 | 61.75 | 62.94 | 64.53 | 56.27 | 45.02 | 38.43 | 23.71 | 44.68 | |||||||||||||
1933 | 27.12 | a | 18.71 | 36.32 | 45.68 | 50.21 | 60.10 | a | 65.81 | 66.35 | 53.35 | 47.63 | a | 37.00 | a | 34.65 | 45.24 | |||||||||
1934 | 34.07 | a | 37.16 | 43.95 | 54.02 | 57.40 | 61.37 | 66.35 | a | 66.08 | 54.17 | a | 47.93 | b | 41.43 | b | 29.42 | 49.45 | ||||||||
1935 | 26.61 | 31.11 | 35.95 | 42.95 | 52.37 | 59.03 | 65.42 | a | 63.97 | a | 60.20 | 44.65 | 30.72 | 29.29 | 45.19 | |||||||||||
1936 | 28.27 | 14.09 | 36.94 | 49.45 | 58.61 | 61.53 | 63.94 | 61.47 | a | 54.25 | 46.71 | c | 29.02 | a | 29.71 | 44.50 | ||||||||||
1937 | 1.97 | b | 23.38 | 36.82 | 43.23 | 53.05 | a | 59.50 | 66.21 | 58.26 | 56.57 | 47.74 | 36.67 | 30.39 | 42.81 | |||||||||||
1938 | 27.58 | 30.02 | a | 35.58 | a | 44.10 | a | 50.97 | a | 60.08 | 66.13 | a | 60.13 | 62.23 | 47.37 | 31.53 | a | 28.40 | 45.35 | |||||||
1939 | 28.98 | 22.75 | 36.45 | 47.28 | 53.61 | 55.38 | 64.97 | 64.65 | 55.90 | a | 44.32 | 36.57 | 33.95 | 45.40 | ||||||||||||
1940 | 27.23 | 32.43 | 40.32 | a | 47.21 | a | 55.42 | a | 61.38 | a | 65.29 | 63.33 | a | 59.86 | a | 48.40 | 29.67 | 29.02 | a | 46.63 | ||||||
1941 | 27.81 | b | 33.95 | 41.97 | 48.10 | a | 52.12 | a | 58.82 | 67.47 | 63.18 | a | 51.62 | 43.64 | b | 37.24 | a | 31.10 | b | 46.42 | ||||||
1942 | 21.26 | 29.79 | b | 37.26 | 46.33 | a | 50.55 | 56.33 | 65.27 | 64.98 | b | 56.98 | 46.10 | a | 31.60 | 28.13 | 44.55 | |||||||||
1943 | 20.28 | b | 29.57 | 29.44 | 46.97 | 48.45 | 59.07 | h | 66.47 | a | 63.84 | 59.82 | 49.24 | 36.65 | t | 28.17 | b | 44.22 | b | |||||||
1944 | 27.38 | o | 29.50 | 36.38 | e | 46.91 | b | 55.58 | e | 60.10 | 67.95 | b | 63.90 | a | 56.50 | y | 53.05 | k | 34.46 | b | 26.79 | g | 49.35 | d | ||
1945 | 28.31 | d | 33.08 | d | 36.32 | a | 42.37 | c | 54.43 | d | 59.16 | a | 68.48 | a | 67.65 | h | 53.35 | c | 48.28 | d | 33.30 | c | 27.62 | a | 44.06 | a |
1946 | 25.00 | e | 29.98 | a | 39.41 | c | 47.19 | i | 56.37 | 58.63 | d | 66.21 | b | 64.77 | i | 55.87 | c | 41.93 | i | 32.50 | g | 28.60 | j | 47.35 | e | |
1947 | 21.23 | a | 33.74 | c | 40.15 | e | 46.32 | h | 57.61 | d | 58.46 | c | 66.17 | d | 63.37 | d | 55.98 | c | 48.22 | b | 33.33 | a | 28.98 | e | 46.11 | a |
1948 | 25.50 | b | 26.24 | f | ----- | z | ----- | z | ----- | z | ----- | z | 62.00 | j | 63.37 | h | 55.78 | a | 44.06 | e | 34.15 | c | 20.26 | b | 35.95 | g |
1949 | 5.52 | a | 22.88 | b | 35.90 | b | 48.52 | b | 57.84 | b | 59.92 | d | 67.66 | i | 65.75 | m | 59.66 | b | 42.08 | a | 39.98 | b | 27.77 | a | 40.01 | b |
1950 | 7.09 | b | 27.48 | c | 33.46 | c | 42.39 | c | 51.36 | f | 58.31 | f | 65.97 | b | 65.33 | h | 58.48 | e | 46.04 | g | 35.58 | j | 30.70 | i | 39.14 | f |
1951 | 24.22 | f | 28.95 | i | 31.06 | g | 45.48 | f | 54.11 | i | 58.16 | k | 67.00 | i | 63.58 | m | 54.55 | j | 44.02 | i | 34.55 | k | 18.07 | h | ----- | z |
1952 | 22.07 | c | 27.58 | c | 33.93 | b | 48.48 | e | 53.81 | g | 58.07 | b | 66.71 | j | 63.17 | j | 58.00 | e | 48.72 | b | 30.85 | c | 28.72 | f | 40.96 | d |
1953 | 36.64 | b | 33.67 | d | 39.03 | 45.80 | h | 52.12 | c | 55.35 | f | 64.57 | h | 63.68 | f | 57.88 | b | 48.20 | d | 37.90 | f | 32.70 | h | 44.59 | f | |
1954 | 22.88 | k | 33.05 | g | 34.92 | e | 42.79 | f | 53.40 | e | 54.96 | e | 63.91 | d | 61.61 | h | 54.93 | i | 42.28 | h | 39.20 | g | 27.70 | a | 46.98 | g |
1955 | 25.92 | a | 24.61 | 27.88 | a | 39.40 | d | 49.32 | c | 60.44 | c | 64.50 | f | 63.46 | d | 55.07 | c | 45.50 | b | 26.75 | b | 23.07 | c | 40.13 | a | |
1956 | 27.26 | b | 19.04 | b | 32.02 | a | 47.48 | 54.83 | b | 57.96 | d | 65.54 | e | ----- | z | ----- | z | 41.97 | n | 30.58 | d | 29.39 | c | 40.45 | c | |
1957 | 12.10 | b | 26.06 | a | 37.17 | a | 46.36 | a | 57.50 | e | 59.79 | d | 63.07 | b | 60.82 | c | 58.00 | e | 44.21 | s | 32.19 | i | 33.08 | g | 46.76 | c |
1958 | 30.22 | b | 39.14 | f | 37.37 | d | 44.00 | f | 60.26 | d | 63.57 | b | 67.90 | b | 67.06 | f | 53.67 | c | 44.94 | d | 31.35 | d | 29.00 | f | 48.66 | d |
1959 | 26.94 | 27.87 | b | 36.43 | b | 45.67 | a | 49.83 | e | 60.60 | j | 65.90 | e | 60.62 | f | 52.92 | e | 43.77 | e | 30.00 | a | 29.00 | c | 40.83 | b | |
1960 | 20.87 | a | 30.97 | 36.43 | b | 45.30 | 50.77 | 60.20 | h | 70.06 | 62.04 | c | 57.59 | c | 47.12 | b | 34.70 | c | 27.89 | i | 45.59 | b | ||||
1961 | 29.53 | 36.43 | a | 39.50 | b | 44.42 | 53.48 | d | 65.85 | j | 69.02 | d | 71.29 | c | 53.30 | b | 43.55 | b | 31.15 | 25.55 | 45.20 | a | ||||
1962 | 21.37 | a | 31.56 | a | 35.15 | d | 47.31 | c | 49.89 | d | 58.10 | a | 64.90 | b | 62.72 | h | 57.88 | e | 46.93 | j | 38.58 | e | 33.00 | e | 43.77 | b |
1963 | 20.03 | a | 36.44 | a | 40.45 | a | 44.70 | e | 53.26 | b | 59.72 | e | 63.50 | j | 66.80 | h | 64.31 | i | 47.80 | i | 37.92 | d | 27.10 | e | 39.95 | d |
1964 | 28.09 | d | 26.24 | b | 31.13 | 43.19 | d | 50.88 | g | 58.81 | i | 67.44 | n | 60.53 | l | 53.28 | e | 47.40 | b | 33.65 | c | 24.11 | 35.89 | d | ||
1965 | 28.45 | a | 30.46 | e | 32.98 | b | 45.73 | h | 50.52 | f | 59.34 | e | 66.81 | e | 65.96 | h | 52.62 | i | 49.12 | f | 37.23 | d | 29.41 | c | 40.67 | e |
1966 | 26.88 | b | 31.84 | c | 36.75 | k | 43.64 | e | 54.62 | e | 56.98 | a | 64.41 | i | 65.17 | h | 61.57 | g | 44.79 | g | 36.61 | c | 33.30 | f | 41.76 | f |
1967 | 32.79 | c | 35.66 | f | 36.86 | f | 41.67 | f | 51.66 | i | 64.29 | r | 66.58 | e | 68.66 | 62.35 | 46.00 | b | 35.14 | a | 26.84 | 48.34 | e | |||
1968 | 26.73 | 36.18 | a | 41.18 | a | 43.21 | a | 52.55 | 59.73 | b | 67.03 | 62.47 | 56.77 | 42.85 | e | 34.78 | 24.61 | 45.67 | ||||||||
1969 | 17.65 | a | 27.31 | d | 35.03 | a | 47.20 | 56.41 | b | 64.10 | a | 64.45 | 62.96 | c | 58.39 | b | 42.77 | 35.03 | 29.17 | a | 45.04 | |||||
1970 | 25.75 | a | 33.39 | a | 36.37 | a | 41.45 | a | 54.37 | 64.46 | b | 68.39 | 65.81 | b | 52.20 | c | 45.14 | f | 34.30 | b | 25.25 | a | 45.61 | a | ||
1971 | 28.52 | 32.48 | a | 33.86 | f | 44.74 | a | 55.52 | 58.78 | a | 66.60 | 69.95 | 53.45 | 42.83 | b | 34.97 | 24.61 | 46.59 | a | |||||||
1972 | 21.56 | 30.55 | 40.83 | b | 42.24 | c | 55.17 | b | 59.00 | i | 63.69 | g | 68.61 | l | 50.54 | g | 45.58 | 37.48 | 25.26 | 37.33 | d | |||||
1973 | 25.63 | 33.23 | 40.25 | a | 45.85 | 55.84 | 61.43 | 68.56 | 66.74 | 59.53 | 46.55 | 33.25 | 32.19 | 47.42 | ||||||||||||
1974 | 24.11 | 34.84 | 38.88 | a | 47.45 | 51.27 | 64.90 | 64.64 | i | 63.64 | i | 57.32 | b | 45.56 | 36.45 | 31.18 | i | 44.53 | c | |||||||
1975 | 20.61 | c | 23.39 | 28.69 | j | 39.17 | d | 50.05 | 58.66 | e | 69.71 | 61.71 | g | 53.43 | p | 43.38 | b | 28.55 | i | 29.90 | 41.86 | d | ||||
1976 | 27.73 | a | 28.41 | b | 32.18 | a | 45.58 | e | 54.03 | 53.41 | n | 65.17 | p | 64.58 | e | 62.33 | o | 42.20 | i | 37.95 | s | 27.05 | i | 42.09 | f | |
1977 | 26.18 | q | 32.00 | f | 35.50 | t | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 24.09 | 29.16 | 36.82 | 45.57 | 53.63 | 59.72 | 66.29 | 64.23 | 55.98 | 45.57 | 34.41 | 27.32 | 45.38 | |||||||||||||
S.D. | 6.57 | 5.41 | 3.58 | 2.83 | 2.83 | 2.41 | 2.11 | 2.58 | 2.86 | 2.26 | 3.22 | 4.06 | 1.65 | |||||||||||||
SKEW | -1.28 | -0.73 | -0.71 | 0.18 | 0.11 | 0.14 | 0.13 | 0.42 | 0.06 | -0.64 | -0.08 | -0.51 | -0.06 | |||||||||||||
MAX | 36.64 | 37.57 | 43.95 | 54.02 | 60.26 | 64.90 | 72.10 | 71.29 | 62.35 | 49.24 | 41.43 | 35.06 | 49.45 | |||||||||||||
MIN | 1.97 | 14.09 | 26.67 | 39.17 | 47.40 | 54.96 | 61.31 | 58.26 | 50.37 | 38.83 | 26.75 | 17.85 | 41.14 | |||||||||||||
YRS | 61 | 58 | 59 | 55 | 56 | 54 | 51 | 46 | 55 | 53 | 55 | 53 | 28 |