| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1901 | ----- | z | 29.96 | 35.36 | m | 43.87 | 57.44 | 61.65 | 72.47 | 69.97 | 57.03 | 49.87 | 37.85 | 31.48 | 51.16 | b | ||||||||||
| 1902 | 28.29 | 31.84 | 32.95 | a | 43.07 | 48.95 | 60.22 | a | 60.50 | a | 61.50 | a | 56.27 | 45.10 | a | 34.69 | a | 24.53 | 43.99 | |||||||
| 1903 | 26.18 | 19.20 | 35.08 | 40.70 | 47.42 | 58.79 | a | 63.17 | a | ----- | z | 52.60 | a | 48.84 | 38.40 | 25.73 | 41.46 | a | ||||||||
| 1904 | 22.55 | 32.93 | 34.76 | 43.21 | f | 49.47 | 56.45 | a | 61.16 | 60.28 | a | 52.13 | 38.97 | b | 33.65 | 23.08 | a | 42.31 | a | |||||||
| 1905 | 24.25 | a | 25.59 | 36.37 | a | 41.00 | 45.32 | 57.45 | 59.43 | a | 62.45 | b | 53.67 | 38.83 | a | 34.27 | ----- | z | 43.51 | a | ||||||
| 1906 | 26.45 | i | 34.95 | 36.85 | 45.23 | 53.76 | 59.60 | 68.18 | 68.41 | b | 57.48 | 49.02 | 34.12 | 31.83 | b | 49.04 | a | |||||||||
| 1907 | 25.52 | 38.25 | 43.60 | 49.04 | b | 51.92 | 56.52 | 67.50 | 67.02 | 56.65 | 53.42 | 41.32 | 30.32 | 48.42 | ||||||||||||
| 1908 | 27.89 | 30.53 | 43.47 | 51.12 | 54.19 | 58.98 | 69.87 | 65.21 | 56.66 | a | 44.60 | 35.90 | 26.47 | a | 47.07 | |||||||||||
| 1909 | 32.14 | q | 32.89 | a | 37.56 | 44.48 | 52.79 | 64.75 | 68.95 | 67.40 | 60.05 | 53.10 | 46.37 | o | 17.86 | b | 49.98 | b | ||||||||
| 1910 | 21.76 | 26.30 | 45.40 | 50.89 | b | 54.56 | e | 62.95 | a | 67.68 | c | 66.21 | g | 56.81 | c | 50.61 | c | 44.26 | a | 31.63 | 46.62 | a | ||||
| 1911 | 31.57 | a | 29.02 | 38.37 | 43.40 | a | 53.65 | 61.47 | 64.90 | 63.48 | 64.05 | 39.42 | a | 29.92 | 27.11 | 45.53 | ||||||||||
| 1912 | 26.82 | 34.62 | a | 35.76 | 39.17 | a | 54.02 | a | 61.05 | a | 63.69 | 63.97 | 49.03 | 40.67 | e | 38.98 | 30.93 | c | 44.89 | |||||||
| 1913 | 20.44 | 30.35 | b | 34.56 | 43.98 | a | 54.56 | 60.22 | 60.60 | 68.63 | a | 59.50 | 50.05 | 39.72 | 28.29 | 45.91 | ||||||||||
| 1914 | 22.35 | a | 25.43 | 34.42 | 48.65 | 54.97 | 50.88 | b | 62.15 | a | 58.79 | 58.08 | 49.00 | 36.63 | 25.95 | 43.94 | ||||||||||
| 1915 | 22.69 | 22.22 | a | 31.70 | a | 45.22 | a | 47.18 | a | 54.80 | 63.35 | 62.13 | e | 56.48 | 50.68 | a | 36.86 | b | 27.88 | a | 43.43 | |||||
| 1916 | 20.34 | 28.41 | 39.87 | 47.95 | 53.05 | 61.80 | 65.73 | 62.87 | 57.88 | a | 48.34 | 35.12 | 25.35 | 45.56 | ||||||||||||
| 1917 | 16.59 | c | 29.64 | 32.77 | 40.50 | 46.03 | 61.45 | a | 69.35 | 65.97 | 59.88 | 46.97 | 45.15 | 34.56 | 45.74 | |||||||||||
| 1918 | 26.77 | 29.16 | 38.02 | 44.82 | 52.84 | 66.15 | 65.84 | 63.97 | 57.93 | 53.29 | 35.80 | 21.94 | 46.38 | |||||||||||||
| 1919 | 18.66 | 24.43 | 36.35 | 44.68 | b | 56.07 | a | 64.07 | b | 70.66 | 68.26 | 61.13 | 44.84 | b | 37.46 | b | 24.98 | 45.97 | ||||||||
| 1920 | 26.58 | 33.74 | 34.68 | 38.45 | a | 56.26 | 63.02 | 67.60 | a | 66.16 | 61.97 | a | 53.11 | 37.32 | b | 24.15 | 46.92 | |||||||||
| 1921 | 25.12 | b | 33.75 | 40.12 | a | 43.68 | 51.85 | d | 65.33 | ----- | z | ----- | z | ----- | z | ----- | z | 34.96 | p | 30.44 | n | 43.31 | f | |||
| 1922 | 20.72 | b | 25.14 | 31.69 | g | 40.78 | c | 53.52 | 65.92 | 69.69 | 67.11 | 60.97 | 48.32 | 34.23 | b | 30.50 | f | 48.64 | b | |||||||
| 1923 | 31.64 | f | 24.76 | g | 34.52 | b | 43.69 | a | ----- | z | 60.95 | j | 71.17 | s | 65.62 | w | ----- | z | 43.22 | a | 37.09 | n | 24.97 | o | 40.47 | i |
| 1924 | 22.30 | d | 33.71 | v | ----- | z | 44.62 | a | 57.86 | t | 65.90 | 69.48 | 67.22 | d | 55.70 | 45.00 | b | 34.57 | 18.56 | 47.04 | c | |||||
| 1925 | 17.23 | a | 32.10 | r | 38.66 | 46.74 | c | 58.27 | 60.48 | 69.52 | g | 66.52 | i | 55.30 | 46.35 | 32.64 | a | 30.00 | 42.85 | c | ||||||
| 1926 | 25.45 | 31.96 | 38.89 | 48.15 | 54.42 | 65.35 | 68.72 | h | 65.48 | 56.62 | 47.53 | n | 37.00 | 23.83 | a | 44.72 | b | |||||||||
| 1927 | 29.07 | x | 31.36 | 35.68 | 43.81 | a | 53.06 | g | 62.85 | 68.61 | 63.40 | ----- | z | 47.87 | 34.30 | y | 24.72 | v | 50.51 | e | ||||||
| 1928 | 28.79 | b | 30.33 | 39.62 | a | 42.34 | b | 55.67 | a | 60.53 | 68.66 | 65.31 | 59.05 | 47.18 | 34.59 | a | 23.23 | 46.27 | ||||||||
| 1929 | 22.58 | 21.04 | a | 36.47 | b | 41.35 | 52.45 | 62.07 | 69.58 | f | 67.19 | 56.05 | 47.77 | a | 34.48 | a | 30.37 | a | 42.89 | a | ||||||
| 1930 | 13.87 | 31.98 | 35.33 | a | 49.90 | 50.37 | a | 63.87 | 68.34 | 65.42 | 55.97 | 44.42 | 33.83 | 24.84 | 44.84 | |||||||||||
| 1931 | 25.24 | 33.27 | 34.55 | 47.36 | a | 53.79 | 64.97 | 72.83 | a | 67.85 | a | 59.88 | 49.08 | 31.36 | a | 21.79 | 46.83 | |||||||||
| 1932 | 18.65 | 30.76 | 36.95 | b | 43.86 | b | 52.75 | a | 61.98 | 68.39 | 67.00 | 59.78 | 47.13 | a | 37.48 | 17.44 | f | 47.70 | a | |||||||
| 1933 | 19.39 | 15.50 | b | 37.10 | 40.13 | 48.26 | 65.42 | 70.76 | 66.32 | 62.30 | 53.02 | 39.65 | 30.60 | 45.70 | ||||||||||||
| 1934 | 29.84 | 37.39 | 45.06 | 49.73 | 60.23 | a | 60.90 | a | 71.76 | 68.87 | 59.35 | 51.07 | a | 38.35 | 29.65 | 50.18 | ||||||||||
| 1935 | 28.60 | a | 32.21 | 34.44 | 43.43 | 49.40 | 64.67 | 68.53 | 66.63 | 59.92 | 46.53 | 34.00 | 27.08 | 46.29 | ||||||||||||
| 1936 | 26.26 | 29.07 | 39.48 | 47.85 | 56.42 | 65.17 | 68.50 | 66.52 | 56.88 | 45.31 | 35.93 | a | 26.90 | 47.02 | ||||||||||||
| 1937 | 8.19 | b | 23.21 | b | 36.21 | 43.77 | 57.19 | 61.23 | 67.48 | 67.39 | 60.45 | 49.73 | 38.55 | 30.82 | 45.35 | |||||||||||
| 1938 | 29.06 | 30.68 | 35.47 | 45.58 | 51.98 | 62.63 | 66.13 | 67.11 | 59.43 | 48.18 | a | 29.47 | 28.79 | b | 46.21 | |||||||||||
| 1939 | 23.98 | 15.77 | 36.44 | 48.48 | 55.39 | 60.66 | a | 68.52 | b | 67.08 | 58.80 | 48.29 | 39.97 | ----- | z | 47.58 | a | |||||||||
| 1940 | 23.55 | t | 32.21 | 40.52 | b | 46.72 | 58.56 | 66.23 | 69.76 | 67.97 | 58.50 | 49.06 | 32.50 | a | 25.37 | 49.76 | a | |||||||||
| 1941 | 24.95 | 30.35 | b | 36.53 | 40.23 | 54.35 | a | 57.80 | 65.74 | 64.84 | 54.03 | 44.50 | 36.16 | a | 27.52 | 44.75 | ||||||||||
| 1942 | 23.71 | 23.12 | 34.13 | 45.82 | 50.53 | 60.14 | b | 67.21 | 65.45 | 56.85 | 49.02 | 36.82 | 31.76 | 45.38 | ||||||||||||
| 1943 | 28.59 | b | 32.86 | 36.89 | 50.23 | 52.00 | 58.72 | 66.90 | 65.13 | 59.85 | 48.06 | 35.42 | 26.47 | b | 46.76 | |||||||||||
| 1944 | 21.29 | c | 23.27 | e | 33.50 | 40.62 | b | 51.79 | 57.15 | 65.36 | f | 65.00 | 58.57 | 48.97 | 33.37 | 29.35 | 42.08 | a | ||||||||
| 1945 | 28.55 | 31.34 | 33.15 | 37.96 | d | 53.73 | i | 55.48 | 66.13 | 64.82 | 55.60 | 48.42 | 34.27 | 23.24 | 43.54 | a | ||||||||||
| 1946 | 22.42 | 29.64 | 38.84 | 51.31 | d | 51.12 | a | 63.50 | 68.66 | 66.65 | a | 58.50 | 42.87 | 31.62 | 31.15 | 46.36 | ||||||||||
| 1947 | 25.11 | 33.95 | 40.02 | 43.95 | 56.87 | 56.93 | 66.97 | 64.11 | 61.27 | 49.69 | 30.02 | 25.60 | 46.21 | |||||||||||||
| 1948 | 25.98 | 25.53 | 29.52 | 45.12 | 54.00 | 60.55 | 66.65 | 65.32 | a | 61.13 | 47.74 | 31.10 | 25.31 | 44.83 | ||||||||||||
| 1949 | 15.79 | 18.38 | 36.50 | 48.78 | 52.52 | 59.93 | 67.47 | 65.84 | 60.27 | 45.71 | 43.83 | 23.50 | a | 44.88 | ||||||||||||
| 1950 | 20.60 | 31.64 | 37.50 | 47.32 | 51.94 | 61.53 | 66.21 | 65.37 | 57.38 | 54.44 | 40.05 | 34.39 | 47.36 | |||||||||||||
| 1951 | 27.16 | 29.37 | a | 36.19 | 47.29 | d | 53.58 | 59.33 | 70.31 | 64.63 | 59.42 | 46.08 | 31.65 | 21.75 | a | 45.56 | ||||||||||
| 1952 | 21.89 | 26.33 | 30.50 | 46.22 | 55.48 | 62.53 | 68.06 | 67.06 | 60.58 | 54.02 | 32.10 | 24.71 | 45.79 | |||||||||||||
| 1953 | 30.50 | 30.93 | 39.19 | 43.70 | 48.90 | 63.18 | 70.21 | 64.40 | 61.38 | 48.53 | 38.45 | 25.76 | 47.10 | |||||||||||||
| 1954 | 28.00 | 39.29 | 36.32 | 50.25 | 57.40 | 60.93 | 70.79 | 65.79 | 60.23 | 50.94 | 40.65 | 24.27 | 48.74 | |||||||||||||
| 1955 | 20.92 | 18.89 | 34.44 | 42.90 | 53.73 | 60.65 | 68.82 | 67.79 | 61.28 | 50.55 | 34.20 | 30.39 | 45.38 | |||||||||||||
| 1956 | 31.17 | a | 25.32 | a | 39.90 | 46.07 | 55.81 | 65.43 | 68.23 | 64.50 | 61.95 | 47.65 | 30.38 | d | ----- | z | 48.76 | a | ||||||||
| 1957 | 20.24 | d | 32.52 | 38.71 | 43.35 | 50.02 | 62.03 | 67.74 | 65.16 | 57.80 | 46.40 | 31.77 | 29.65 | 45.45 | ||||||||||||
| 1958 | 27.71 | 34.75 | 33.29 | 42.28 | 58.02 | 64.50 | 68.24 | 69.32 | 59.68 | 50.02 | 37.03 | 34.63 | a | 48.29 | ||||||||||||
| 1959 | 27.55 | 30.80 | 37.48 | 46.48 | 52.63 | d | 66.58 | 70.44 | 66.98 | 58.34 | a | 48.48 | 37.09 | a | 28.02 | 47.57 | ||||||||||
| 1960 | 18.62 | f | 23.74 | 38.67 | a | 46.37 | 52.70 | i | 64.14 | b | 69.94 | 67.76 | 61.30 | c | 47.63 | 35.84 | b | 27.35 | 48.27 | b | ||||||
| 1961 | 26.15 | a | 32.00 | 35.94 | 44.35 | 53.53 | a | 66.57 | h | 69.79 | 67.62 | b | 52.83 | a | 47.15 | a | 33.22 | 21.92 | 44.04 | a | ||||||
| 1962 | 25.03 | 32.64 | 31.87 | 48.62 | d | 52.00 | 61.07 | 67.29 | 66.05 | 58.37 | 49.08 | 38.87 | 28.37 | 46.60 | ||||||||||||
| 1963 | 17.58 | 34.91 | a | 32.90 | 40.52 | 56.40 | 59.02 | 68.79 | 65.19 | 59.35 | 51.56 | 34.17 | 23.80 | a | 45.35 | |||||||||||
| 1964 | 21.50 | 25.21 | a | 31.06 | 43.63 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 50.94 | 32.05 | 25.46 | c | 32.84 | e | |||||
| 1965 | 30.34 | 28.70 | 33.53 | a | 43.56 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.21 | p | 25.44 | 29.50 | h | |||
| 1966 | 21.23 | 23.29 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.08 | ----- | z | ----- | z | 39.10 | 24.39 | 35.22 | g | |||||
| 1967 | 24.48 | ----- | z | ----- | z | ----- | z | 51.53 | a | 57.96 | d | 70.47 | 68.34 | 59.52 | 51.94 | 37.77 | h | 18.42 | 50.33 | d | ||||||
| 1968 | 18.32 | 31.78 | 39.06 | 40.69 | d | 49.86 | c | 62.85 | 65.71 | 60.98 | 56.13 | 49.10 | 34.98 | 20.28 | a | 44.15 | ||||||||||
| 1969 | 27.82 | 23.95 | 30.40 | 45.87 | 58.52 | 59.57 | 69.35 | a | 70.15 | 61.38 | 42.34 | 35.22 | g | 30.45 | 47.25 | a | ||||||||||
| 1970 | 26.47 | ----- | z | 34.77 | 39.98 | 54.34 | 62.20 | 69.32 | a | 69.79 | 55.98 | 42.77 | 34.33 | 25.58 | 46.87 | a | ||||||||||
| 1971 | 26.00 | 28.09 | a | 35.57 | a | 44.07 | 51.45 | ----- | z | ----- | z | 68.77 | 55.98 | 44.08 | ----- | z | ----- | z | 44.25 | d | ||||||
| 1972 | 28.03 | 33.57 | 43.97 | 45.60 | 54.69 | 64.22 | 69.40 | a | 66.13 | 58.23 | d | 48.91 | c | 32.57 | a | ----- | z | 49.57 | a | |||||||
| 1973 | 16.82 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 69.98 | a | ----- | z | ----- | z | 27.03 | n | 27.10 | 37.97 | i | ||
| 1974 | 17.10 | a | 22.89 | 41.95 | 43.03 | 57.77 | 66.15 | 67.90 | 66.69 | 60.20 | 49.56 | 35.05 | 25.52 | 46.15 | ||||||||||||
| 1975 | 24.23 | 28.63 | b | 35.65 | a | 38.50 | 49.71 | 58.83 | 69.50 | c | 65.45 | 58.84 | a | 46.84 | 33.77 | 27.94 | 44.82 | |||||||||
| 1976 | 24.56 | 34.38 | 34.19 | 43.55 | 55.35 | 61.28 | 70.85 | 65.16 | 59.35 | 46.27 | 38.75 | 27.27 | 46.75 | |||||||||||||
| 1977 | 24.56 | 34.04 | 32.18 | 47.47 | 49.90 | j | 67.62 | a | 69.90 | 69.34 | 60.72 | 49.68 | 37.26 | a | 31.69 | b | 47.68 | a | ||||||||
| 1978 | 25.69 | 27.02 | 41.05 | 46.33 | a | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.02 | h | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 23.84 | 29.00 | 36.57 | 44.75 | 53.30 | 61.57 | 67.78 | 66.06 | 58.32 | 47.86 | 35.76 | 26.78 | 46.06 | |||||||||||||
| S.D. | 4.48 | 5.11 | 3.43 | 3.29 | 3.18 | 3.22 | 2.83 | 2.32 | 2.69 | 3.42 | 3.40 | 3.78 | 1.33 | |||||||||||||
| SKEW | -0.77 | -0.63 | 0.46 | 0.01 | -0.27 | -0.55 | -1.08 | -0.67 | -0.83 | -0.57 | 0.49 | -0.10 | 0.67 | |||||||||||||
| MAX | 31.57 | 39.29 | 45.40 | 51.31 | 60.23 | 67.62 | 72.83 | 70.15 | 64.05 | 54.44 | 45.15 | 34.63 | 50.18 | |||||||||||||
| MIN | 8.19 | 15.50 | 29.52 | 37.96 | 45.32 | 50.88 | 59.43 | 58.79 | 49.03 | 38.83 | 29.47 | 17.86 | 43.43 | |||||||||||||
| YRS | 71 | 72 | 72 | 73 | 67 | 70 | 66 | 70 | 70 | 72 | 68 | 67 | 44 | |||||||||||||