YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1903 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 66.67 | p | 56.40 | 50.34 | 38.13 | 32.58 | 44.36 | h | ||||
1904 | 32.65 | a | 34.98 | 37.94 | o | 51.00 | 55.98 | 60.78 | 69.27 | 70.72 | b | 61.87 | ----- | z | ----- | z | ----- | z | 54.66 | d | ||||||
1905 | ----- | z | ----- | z | 46.00 | g | 52.75 | 56.97 | 63.93 | ----- | z | 71.68 | a | 61.12 | 43.79 | 33.60 | ----- | z | 54.83 | e | ||||||
1906 | ----- | z | ----- | z | ----- | z | 54.14 | b | ----- | z | ----- | z | 74.79 | ----- | z | 61.27 | 51.85 | 38.80 | 35.50 | 52.73 | f | |||||
1907 | 24.85 | 36.05 | 42.84 | 50.02 | 58.81 | ----- | z | 71.66 | 66.35 | a | 62.38 | 56.78 | a | 39.61 | b | 31.38 | a | 49.16 | a | |||||||
1908 | 31.61 | 35.73 | a | 41.61 | 52.03 | 54.58 | a | 60.62 | b | 73.87 | 70.30 | a | 62.12 | b | 48.69 | 40.63 | 30.55 | c | 50.20 | |||||||
1909 | 23.43 | c | 37.48 | a | 45.19 | 46.42 | 55.52 | a | 64.23 | 68.73 | a | 66.82 | 62.20 | 50.81 | b | 40.63 | 29.23 | 49.22 | ||||||||
1910 | 26.72 | d | 29.57 | 47.08 | 55.09 | c | 59.06 | 63.20 | 71.31 | 64.79 | 60.47 | a | 52.42 | 40.03 | a | 34.69 | 50.37 | |||||||||
1911 | 29.97 | 32.05 | 43.15 | 48.62 | 52.79 | 64.71 | a | 70.05 | a | 67.35 | 58.74 | a | 47.16 | 33.78 | a | 30.66 | 48.25 | |||||||||
1912 | 30.47 | b | 37.37 | b | 39.55 | a | 48.48 | 56.61 | 65.22 | 67.60 | 66.95 | a | 55.78 | 47.40 | 39.20 | 32.90 | 48.96 | |||||||||
1913 | 25.70 | c | 25.71 | 36.85 | 48.68 | 56.37 | 63.53 | 68.18 | 69.21 | 61.50 | 47.21 | c | 40.05 | 29.59 | b | 47.72 | ||||||||||
1914 | 33.60 | 35.70 | a | 46.26 | 51.08 | 59.68 | 61.90 | 72.77 | 70.27 | 60.16 | a | 53.60 | 41.00 | 25.31 | 50.94 | |||||||||||
1915 | 28.77 | 38.14 | 47.05 | 54.32 | 56.18 | 61.28 | 67.82 | 75.34 | 60.43 | 51.63 | 37.74 | a | 32.35 | 50.92 | ||||||||||||
1916 | 17.82 | 33.60 | 44.03 | 49.34 | a | 52.03 | 61.95 | 67.84 | 68.08 | 60.80 | 46.18 | 34.07 | 26.27 | 46.84 | ||||||||||||
1917 | 26.89 | 33.70 | 35.34 | 46.78 | 55.70 | c | 61.09 | a | 72.13 | a | 70.16 | 64.27 | 49.26 | 42.13 | 38.32 | 49.65 | ||||||||||
1918 | 34.61 | 33.30 | 44.39 | 50.60 | 55.08 | 70.50 | 73.95 | a | 68.24 | 66.62 | 53.56 | d | 40.38 | d | 34.05 | k | 53.75 | a | ||||||||
1919 | 25.33 | s | 35.25 | j | 43.44 | f | 53.79 | i | 59.21 | 67.50 | 74.79 | 72.55 | 62.76 | g | 48.74 | 38.60 | 23.12 | b | 54.93 | e | ||||||
1920 | 28.39 | 39.67 | 42.79 | 47.00 | m | 57.06 | 64.03 | a | 77.31 | 73.98 | 64.91 | h | 48.00 | g | 41.37 | 34.97 | b | 51.06 | c | |||||||
1921 | 33.32 | 37.21 | b | 47.04 | c | 49.95 | 59.32 | 70.57 | a | 72.60 | 73.76 | 58.75 | 54.58 | 41.37 | 33.60 | 52.67 | ||||||||||
1922 | 25.09 | c | 29.33 | d | 39.66 | 47.33 | 56.11 | 69.92 | 74.90 | 73.84 | 64.63 | 53.24 | 36.61 | b | 26.94 | 49.80 | ||||||||||
1923 | 35.61 | 30.27 | 42.13 | 50.77 | 58.10 | 62.08 | f | 75.07 | a | 73.58 | 64.77 | 52.94 | 41.23 | 33.60 | 50.73 | a | ||||||||||
1924 | 26.63 | 41.65 | b | 41.81 | 50.17 | 64.00 | i | 66.52 | 73.79 | 70.37 | 62.90 | 50.20 | a | 39.35 | 24.70 | a | 49.83 | a | ||||||||
1925 | 34.34 | 40.07 | 44.80 | a | 55.82 | 62.79 | 67.86 | a | 76.30 | a | 73.23 | c | 64.38 | a | 48.65 | 40.04 | b | 38.98 | 53.94 | |||||||
1926 | 33.34 | 41.61 | 46.80 | a | 57.33 | a | 60.02 | b | 68.12 | a | 75.91 | c | 71.69 | b | 57.95 | 51.53 | b | 41.27 | b | 33.28 | d | 53.24 | ||||
1927 | 31.80 | a | 38.96 | b | 42.37 | a | 49.88 | b | 55.18 | c | 66.76 | a | 72.67 | b | 71.82 | a | 59.04 | e | 51.72 | f | 42.61 | c | 24.02 | 50.46 | a | |
1928 | 31.31 | d | 35.20 | d | 44.26 | h | 48.87 | d | 64.04 | e | 64.86 | b | 75.07 | c | 70.50 | d | 61.89 | c | 50.45 | a | 28.38 | m | 21.90 | u | 55.80 | c |
1929 | 23.18 | c | 24.59 | e | 41.98 | 47.12 | 55.94 | 62.23 | 72.34 | 75.04 | f | 60.38 | 52.32 | 36.63 | 36.72 | a | 46.68 | a | ||||||||
1930 | 17.37 | 38.98 | a | 44.15 | a | 57.02 | a | 57.83 | a | 63.97 | a | 74.90 | 76.10 | 64.12 | 49.44 | 37.20 | b | 27.05 | 50.68 | |||||||
1931 | 34.65 | a | 37.17 | a | 43.31 | 50.17 | 62.05 | 67.83 | 75.92 | 73.13 | 60.40 | 47.82 | 24.70 | t | 29.63 | 52.92 | a | |||||||||
1932 | 30.55 | 31.90 | 42.23 | 52.38 | 59.21 | 67.83 | 73.03 | 73.22 | d | 62.75 | 54.40 | 43.80 | b | 32.73 | i | 53.76 | a | |||||||||
1933 | 33.94 | 30.06 | c | 44.24 | 51.67 | d | 55.21 | b | 67.95 | 75.45 | 74.21 | 61.48 | 54.19 | 43.92 | 39.60 | 52.66 | ||||||||||
1934 | 40.61 | 44.75 | 51.60 | 59.55 | 64.82 | 68.25 | 75.60 | 74.23 | 61.42 | 53.05 | ----- | z | 36.50 | b | 57.31 | a | ||||||||||
1935 | 31.52 | a | 37.52 | 40.26 | 48.84 | a | 60.74 | n | 65.73 | b | 73.40 | 70.53 | 65.57 | 52.23 | c | 36.43 | 32.65 | 50.43 | a | |||||||
1936 | 33.77 | a | 25.91 | g | 41.68 | a | 55.12 | a | 64.22 | d | 70.33 | d | 76.10 | 74.23 | 63.65 | f | 53.03 | 32.71 | a | 33.98 | a | 53.52 | b | |||
1937 | 16.29 | g | 31.27 | 45.09 | d | 47.78 | 59.19 | 63.27 | b | 76.59 | b | 70.45 | 66.43 | 54.35 | 43.75 | 36.65 | a | 54.08 | a | |||||||
1938 | 36.09 | b | 39.27 | b | 44.25 | a | 51.97 | 58.81 | d | 70.04 | b | 77.00 | a | 70.97 | 70.60 | 54.21 | 36.83 | 33.00 | a | 53.59 | ||||||
1939 | 36.55 | 34.43 | a | 46.96 | g | 53.78 | 61.72 | b | 64.41 | c | 75.60 | a | 74.42 | 65.57 | b | 51.95 | 40.80 | 38.08 | a | 54.30 | a | |||||
1940 | 32.65 | 39.57 | 46.84 | 52.60 | 61.82 | f | 68.22 | a | 74.27 | 72.66 | 67.54 | b | 55.73 | a | 37.28 | a | 33.06 | e | 52.77 | a | ||||||
1941 | 34.48 | 40.50 | a | ----- | z | 54.12 | a | 60.05 | a | 66.43 | b | 76.13 | 74.05 | b | 57.73 | 50.97 | 41.43 | b | 35.50 | d | 53.76 | a | ||||
1942 | 26.45 | 35.40 | c | 41.44 | 52.92 | 55.94 | 61.87 | 73.19 | 72.53 | 62.52 | 52.08 | 37.93 | 34.81 | 50.59 | ||||||||||||
1943 | 28.48 | f | 38.32 | 39.32 | a | 52.33 | a | 55.08 | 60.92 | 72.05 | 68.05 | a | 63.72 | 52.67 | a | 39.57 | 32.37 | 52.22 | a | |||||||
1944 | 30.65 | 34.15 | f | 38.81 | 51.08 | 59.61 | 65.37 | 72.33 | a | 68.82 | 63.78 | 54.24 | 40.12 | 35.57 | b | 52.76 | a | |||||||||
1945 | 35.59 | c | 39.04 | 42.16 | b | 48.12 | 58.81 | 63.98 | 74.40 | 73.37 | 60.88 | 53.69 | 40.02 | 32.63 | 51.89 | |||||||||||
1946 | 34.37 | 39.23 | 45.89 | 53.97 | a | 59.29 | 63.64 | a | 72.44 | 73.08 | 63.13 | 48.02 | 39.37 | 35.11 | 52.29 | |||||||||||
1947 | 28.98 | a | 38.91 | 46.68 | 53.25 | 64.16 | 65.10 | 73.53 | a | 70.03 | 63.67 | a | 54.10 | 39.95 | 36.74 | 52.93 | ||||||||||
1948 | 31.82 | 35.97 | 40.69 | 50.77 | 59.24 | 69.82 | 69.92 | 69.24 | 62.38 | 50.13 | 39.17 | 25.47 | 50.38 | |||||||||||||
1949 | 14.74 | 33.20 | 43.13 | 54.30 | 62.18 | 65.67 | 71.45 | 73.24 | 63.62 | 44.77 | e | 43.35 | 31.40 | a | 50.09 | |||||||||||
1950 | 19.52 | a | 32.89 | 41.27 | 49.33 | 56.15 | 64.22 | 71.73 | 71.71 | 62.28 | 52.61 | 42.37 | 41.00 | 50.42 | ||||||||||||
1951 | 32.77 | 37.14 | 42.09 | h | 52.16 | b | 59.39 | c | 63.38 | 74.71 | 71.16 | 63.17 | c | 50.77 | i | 40.73 | h | 32.05 | a | 53.99 | c | |||||
1952 | 29.95 | a | 37.20 | f | 42.31 | 55.15 | c | 60.58 | a | 65.36 | b | 71.82 | 71.16 | c | 64.31 | a | 54.55 | 37.32 | 35.60 | b | 53.46 | a | ||||
1953 | 40.44 | 40.65 | a | 44.87 | a | 50.10 | d | 56.23 | 62.38 | 72.79 | 72.29 | 65.12 | 53.16 | b | 43.02 | b | 37.81 | 53.24 | ||||||||
1954 | 33.57 | b | 42.02 | a | 41.58 | 50.68 | 60.37 | 62.93 | 72.05 | 67.82 | 63.10 | 49.29 | 44.48 | a | 33.48 | f | 53.45 | a | ||||||||
1955 | 34.09 | d | 35.00 | 36.68 | 47.22 | 55.79 | 65.98 | 71.26 | 71.90 | 62.14 | a | 52.30 | d | 32.61 | b | 31.35 | a | 49.69 | ||||||||
1956 | 31.56 | 31.88 | a | 41.10 | 52.97 | a | 60.30 | a | 64.03 | 74.31 | 70.73 | 63.80 | b | 51.22 | b | 39.30 | c | 35.94 | 51.43 | |||||||
1957 | 22.35 | 38.04 | e | 43.37 | 50.69 | a | 61.34 | 68.03 | a | 71.98 | a | 69.35 | e | 66.00 | b | 50.75 | g | 38.00 | d | 35.75 | a | 51.36 | a | |||
1958 | 35.40 | a | 43.20 | a | 42.86 | c | 50.37 | c | 66.08 | 70.12 | 75.05 | 74.90 | 62.27 | b | 52.36 | b | 40.29 | b | 38.43 | a | 54.28 | |||||
1959 | 34.67 | b | 38.43 | 43.84 | 52.03 | a | 55.77 | 66.35 | 74.23 | a | 69.98 | a | 59.48 | h | 51.76 | 36.70 | b | 33.92 | 50.70 | a | ||||||
1960 | 28.47 | 36.36 | 45.04 | c | 52.32 | 57.58 | a | 66.77 | 76.74 | 68.10 | 64.35 | 51.63 | 40.48 | 32.26 | 51.67 | |||||||||||
1961 | 33.73 | 40.41 | 45.03 | 50.65 | 59.61 | 71.77 | 75.61 | 77.10 | 59.12 | 49.39 | 36.33 | d | 32.82 | 52.63 | ||||||||||||
1962 | 29.23 | 37.20 | 41.98 | 53.98 | 56.84 | 66.03 | 70.81 | 70.81 | 64.47 | 52.03 | 43.62 | a | 37.31 | 52.03 | ||||||||||||
1963 | 25.39 | 39.82 | 45.34 | 49.97 | 61.26 | 66.82 | 71.15 | 73.73 | 69.55 | 55.48 | 41.95 | 33.89 | 52.86 | |||||||||||||
1964 | 34.40 | 37.31 | 41.58 | 49.40 | 58.66 | 65.22 | a | 72.69 | 68.21 | 59.92 | 51.97 | 39.80 | 30.68 | a | 50.82 | |||||||||||
1965 | 34.61 | 38.68 | 40.34 | 53.67 | 57.27 | 64.57 | 72.77 | a | 71.21 | 58.57 | 53.87 | 44.07 | 35.13 | a | 52.06 | |||||||||||
1966 | 34.97 | 37.46 | 42.85 | a | 50.48 | 61.05 | 63.12 | 72.13 | 72.47 | 67.25 | 48.95 | 41.37 | 37.40 | a | 52.46 | |||||||||||
1967 | 37.67 | a | 39.05 | 41.63 | 47.25 | 57.29 | 67.55 | 74.52 | 76.47 | 68.55 | 50.69 | 41.35 | 31.45 | 52.79 | ||||||||||||
1968 | 30.85 | 41.57 | 46.69 | 48.15 | 57.85 | 65.78 | 73.63 | 69.11 | 62.35 | 48.58 | 40.35 | 30.71 | 51.30 | |||||||||||||
1969 | 25.98 | 35.54 | 42.53 | 51.82 | 61.06 | 68.78 | 71.35 | 71.63 | 63.15 | 47.05 | 40.97 | 34.92 | 51.23 | |||||||||||||
1970 | 33.26 | 43.00 | 42.77 | 46.50 | 60.13 | 69.60 | 75.02 | 74.53 | 57.33 | 49.77 | 40.67 | 32.29 | 52.07 | |||||||||||||
1971 | 34.37 | a | 38.61 | 41.40 | 51.15 | 61.32 | 63.43 | 72.56 | 76.89 | 58.87 | 49.45 | 39.22 | 32.61 | 51.66 | ||||||||||||
1972 | 31.02 | 36.45 | 46.66 | 47.53 | 61.60 | 67.25 | 71.27 | 74.13 | 59.38 | 51.19 | 40.88 | 28.31 | 51.31 | |||||||||||||
1973 | 30.29 | 38.66 | 45.06 | 50.95 | 60.66 | 66.27 | 74.69 | 73.24 | 63.98 | 50.33 | a | 38.97 | 37.65 | 52.56 | ||||||||||||
1974 | 28.97 | 40.29 | 44.10 | 51.43 | 55.87 | 69.72 | 73.19 | 72.03 | 64.60 | 52.40 | 42.65 | 35.85 | 52.59 | |||||||||||||
1975 | 32.63 | a | 35.55 | 42.03 | 46.87 | 55.34 | 62.03 | 75.85 | 67.77 | 62.17 | 49.81 | 38.10 | 33.67 | a | 50.15 | |||||||||||
1976 | 33.56 | 36.26 | 39.63 | 49.40 | 59.53 | 61.02 | 71.19 | 68.81 | 65.03 | 50.29 | 41.48 | 31.39 | 50.63 | |||||||||||||
1977 | 28.61 | 39.18 | 41.68 | 54.07 | 55.52 | 69.33 | 70.47 | 73.56 | 60.43 | 49.68 | 37.33 | 35.40 | 51.27 | |||||||||||||
1978 | 34.40 | 40.77 | 47.52 | 51.05 | 54.55 | 65.63 | 71.71 | 69.58 | 61.25 | 50.68 | 35.17 | 27.63 | 50.83 | |||||||||||||
1979 | 19.69 | 34.29 | 44.82 | 49.85 | 58.87 | 65.88 | 72.76 | 72.65 | 64.85 | 52.79 | 37.58 | 36.48 | 50.88 | |||||||||||||
1980 | 27.97 | 38.00 | 42.29 | 54.23 | 58.61 | 62.87 | 70.81 | 66.11 | 61.85 | 50.95 | 41.15 | 37.27 | 51.01 | |||||||||||||
1981 | 37.45 | 38.30 | 45.57 | b | ----- | z | ----- | z | ----- | z | 67.58 | 72.84 | 62.92 | ----- | z | ----- | z | 33.63 | l | 54.11 | f | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 30.64 | 36.80 | 43.13 | 51.20 | 58.53 | 65.60 | 73.02 | 71.45 | 62.54 | 51.21 | 39.59 | 33.14 | 51.26 | |||||||||||||
S.D. | 5.21 | 3.88 | 2.79 | 2.76 | 2.88 | 2.83 | 2.37 | 2.69 | 2.89 | 2.57 | 2.72 | 3.90 | 1.56 | |||||||||||||
SKEW | -0.92 | -0.81 | -0.08 | 0.43 | 0.31 | 0.16 | -0.43 | -0.19 | 0.19 | -0.46 | -0.57 | -0.59 | -0.51 | |||||||||||||
MAX | 40.61 | 44.75 | 51.60 | 59.55 | 66.08 | 71.77 | 77.31 | 77.10 | 70.60 | 56.78 | 44.48 | 41.00 | 54.28 | |||||||||||||
MIN | 14.74 | 24.59 | 35.34 | 46.42 | 52.03 | 60.63 | 67.58 | 64.79 | 55.78 | 43.79 | 32.61 | 23.12 | 46.84 | |||||||||||||
YRS | 73 | 72 | 70 | 75 | 73 | 74 | 77 | 76 | 75 | 73 | 73 | 72 | 49 |