| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1899 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1900 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1901 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1902 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1903 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1904 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1905 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1906 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1907 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1908 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1909 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1910 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1911 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1912 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1913 | ----- | z | ----- | z | ----- | z | 39.00 | a | 48.90 | a | 54.41 | c | 59.26 | 62.11 | c | 54.30 | j | 34.67 | j | 32.38 | a | 18.24 | b | 44.90 | e | |
| 1914 | 22.45 | 24.36 | 32.42 | 40.87 | 48.63 | a | 51.32 | e | 60.96 | g | 58.70 | a | 47.72 | a | 41.90 | a | 27.04 | d | 13.27 | a | 37.15 | a | ||||
| 1915 | 12.90 | 26.96 | 33.06 | 44.63 | 43.81 | 49.58 | f | 59.26 | 60.73 | a | 46.37 | 36.86 | c | 30.03 | 21.48 | 37.83 | a | |||||||||
| 1916 | 16.50 | c | 24.32 | a | 31.73 | a | 39.37 | 40.26 | 49.10 | 61.77 | 58.00 | 47.77 | 37.13 | a | 24.53 | 16.83 | b | 37.28 | ||||||||
| 1917 | 6.31 | e | 15.74 | a | 19.71 | 33.64 | b | 43.06 | 51.27 | 63.74 | d | 57.36 | c | 50.17 | 37.26 | 31.90 | 30.34 | b | 36.71 | |||||||
| 1918 | 22.53 | a | 18.64 | 33.19 | 34.47 | 42.84 | 59.48 | e | 60.08 | e | 55.65 | h | 53.20 | 42.68 | 29.87 | 21.32 | 38.03 | a | ||||||||
| 1919 | 19.53 | a | 24.26 | a | 30.84 | 40.60 | 48.84 | 58.23 | 63.86 | b | 61.84 | 52.70 | 33.42 | ----- | z | ----- | z | 43.41 | b | |||||||
| 1920 | ----- | z | ----- | z | ----- | z | 32.97 | a | 45.77 | 53.97 | 63.68 | 60.55 | 50.47 | 38.90 | 30.80 | 22.10 | 44.36 | c | ||||||||
| 1921 | 24.50 | a | 25.11 | 33.68 | 35.60 | 45.87 | 56.30 | 61.55 | 60.65 | 47.03 | 43.42 | 34.57 | 25.48 | 41.15 | ||||||||||||
| 1922 | 11.55 | 18.46 | 23.29 | 32.43 | 44.53 | a | 57.23 | 58.00 | 60.16 | 49.50 | 38.58 | 27.72 | a | 22.73 | a | 37.02 | ||||||||||
| 1923 | 22.23 | 12.07 | a | 25.71 | 36.33 | 45.33 | a | 50.10 | a | 64.16 | 56.32 | 47.83 | 34.29 | 28.83 | 17.84 | 36.75 | ||||||||||
| 1924 | 6.35 | 25.34 | 26.29 | 34.76 | a | 46.06 | 51.20 | 59.61 | 53.68 | 43.50 | 34.52 | 27.27 | 9.17 | a | 34.81 | |||||||||||
| 1925 | 14.48 | 27.89 | 30.65 | 38.87 | 48.71 | 51.77 | 61.55 | 56.16 | 48.20 | 35.97 | 25.63 | 26.19 | 38.84 | |||||||||||||
| 1926 | 13.42 | 25.89 | 29.61 | 41.33 | 46.00 | 53.97 | 58.90 | 57.39 | 43.57 | 35.77 | 31.10 | 16.13 | 37.76 | |||||||||||||
| 1927 | 18.32 | 25.18 | 27.90 | 34.87 | 40.42 | 52.43 | 57.10 | 55.81 | 46.97 | a | 36.32 | 32.21 | a | 14.67 | a | 36.85 | ||||||||||
| 1928 | 16.37 | a | 21.72 | 30.81 | 32.80 | 48.10 | 48.30 | 59.13 | 53.97 | 44.30 | 35.07 | a | 28.07 | 10.60 | a | 35.77 | ||||||||||
| 1929 | 9.87 | 12.96 | 26.77 | 33.13 | 40.39 | 47.03 | 59.26 | 58.68 | 44.10 | 34.39 | 20.53 | 21.55 | 34.06 | |||||||||||||
| 1930 | 5.24 | b | 24.68 | 29.10 | 39.47 | 39.57 | a | 49.23 | 61.00 | 59.77 | 47.07 | a | 35.61 | 20.00 | 8.28 | b | 34.92 | |||||||||
| 1931 | 6.35 | 23.61 | 26.87 | a | 36.10 | 42.19 | 55.00 | 60.33 | a | 59.14 | b | 46.90 | a | 38.65 | 21.59 | a | 12.39 | 35.76 | ||||||||
| 1932 | 5.83 | a | 13.89 | a | 27.06 | 35.50 | 44.94 | 50.27 | 56.29 | 53.97 | a | 45.04 | b | 34.31 | b | 27.83 | 7.55 | b | 33.54 | |||||||
| 1933 | 10.71 | 3.64 | 22.81 | 32.43 | 40.03 | a | 57.03 | 61.42 | 54.03 | a | 47.60 | 38.67 | a | 25.97 | 23.52 | 34.82 | ||||||||||
| 1934 | 24.29 | 29.36 | 33.48 | b | 38.83 | 48.52 | 50.57 | 58.71 | 57.31 | b | 44.00 | 36.03 | b | 30.73 | 24.74 | 39.71 | ||||||||||
| 1935 | 19.76 | b | 24.64 | 29.06 | 38.77 | 43.35 | 54.31 | a | 59.74 | 56.39 | 50.17 | 35.77 | a | 24.50 | 20.81 | 38.11 | ||||||||||
| 1936 | 18.39 | 23.14 | 27.97 | 40.23 | 45.06 | 55.33 | 62.26 | 58.45 | b | 44.30 | 37.00 | e | 24.46 | d | 24.52 | 38.43 | ||||||||||
| 1937 | 3.73 | a | 15.41 | a | 28.61 | c | 33.00 | 46.86 | b | 49.89 | c | 59.50 | a | 56.61 | 48.86 | b | 40.30 | a | 30.77 | 25.58 | 36.59 | |||||
| 1938 | 27.63 | d | 27.36 | 29.57 | a | 39.03 | 41.58 | 53.43 | 56.90 | 57.04 | c | 51.31 | a | 40.23 | 23.03 | 26.39 | 39.46 | |||||||||
| 1939 | 20.13 | 13.29 | 27.48 | 38.24 | a | 45.61 | 50.23 | 57.73 | a | 52.90 | a | 47.73 | 36.81 | 26.73 | 24.29 | 36.77 | ||||||||||
| 1940 | 23.03 | 30.45 | 32.71 | 38.90 | 46.68 | 52.50 | 58.71 | 56.58 | 51.03 | 39.16 | 26.67 | 21.90 | 39.86 | |||||||||||||
| 1941 | 20.03 | 26.00 | 31.61 | 36.54 | b | 46.74 | 50.27 | 58.77 | 57.45 | 43.50 | 37.13 | 26.50 | 24.74 | 38.27 | ||||||||||||
| 1942 | 6.47 | a | 11.18 | 20.45 | 37.23 | 40.52 | 48.13 | 58.55 | 53.55 | ----- | z | ----- | z | 28.67 | i | 25.69 | e | 33.53 | c | |||||||
| 1943 | 23.03 | a | 22.36 | 24.55 | t | ----- | z | ----- | z | 51.12 | f | 59.58 | 58.16 | 47.69 | a | 38.63 | d | 27.13 | 21.65 | 37.28 | d | |||||
| 1944 | 5.84 | 17.62 | 24.03 | a | 35.80 | 49.16 | 52.27 | 61.52 | 59.00 | 50.87 | 44.19 | 29.30 | 20.87 | a | 37.54 | |||||||||||
| 1945 | 23.48 | 28.22 | a | 29.10 | 35.27 | 48.21 | c | 52.07 | a | 63.37 | d | 60.30 | a | 45.45 | a | 42.15 | d | 28.81 | i | 20.00 | g | 42.76 | b | |||
| 1946 | 18.68 | 21.00 | c | 31.50 | i | 42.11 | c | 46.39 | 55.03 | a | 63.17 | b | 62.04 | c | 44.21 | f | 33.83 | b | 28.14 | a | 27.30 | a | 39.77 | b | ||
| 1947 | 7.03 | a | 26.00 | 31.68 | 35.36 | b | 44.86 | c | 52.67 | 70.22 | m | ----- | z | ----- | z | ----- | z | ----- | z | 17.47 | a | 30.72 | e | |||
| 1948 | 19.29 | 21.48 | 27.57 | a | 36.11 | b | 46.32 | 56.93 | 63.80 | a | 60.39 | 51.63 | 39.39 | 28.00 | 17.77 | 39.06 | ||||||||||
| 1949 | 3.16 | 12.57 | 29.90 | 41.23 | 43.90 | a | 52.03 | 61.42 | 60.42 | 51.24 | a | 36.94 | 33.17 | 21.29 | 37.27 | |||||||||||
| 1950 | 16.68 | 26.68 | 30.42 | 35.17 | 42.06 | 50.63 | 59.13 | 55.61 | 49.17 | 42.48 | 34.23 | 29.71 | 39.33 | |||||||||||||
| 1951 | 20.58 | 25.29 | 26.23 | 40.87 | 47.52 | 51.37 | 62.16 | 57.35 | 48.97 | 39.65 | 27.97 | 20.58 | 39.04 | |||||||||||||
| 1952 | 17.87 | 17.17 | 24.61 | 38.03 | 47.48 | 54.13 | 60.87 | a | 59.00 | 53.63 | 41.48 | 24.67 | 23.97 | 38.58 | ||||||||||||
| 1953 | 31.48 | 26.71 | 32.06 | 36.93 | 44.81 | 53.40 | 63.61 | 60.06 | 51.00 | 41.94 | 35.90 | 22.81 | 41.73 | |||||||||||||
| 1954 | 25.39 | 26.82 | 27.39 | 42.63 | 47.81 | 52.73 | 62.94 | 58.16 | 49.76 | a | 38.87 | 31.90 | 22.26 | 40.55 | ||||||||||||
| 1955 | 9.74 | 16.07 | 24.26 | 33.93 | 44.87 | 52.50 | 59.35 | 61.77 | 49.50 | 40.29 | 25.93 | 29.68 | 37.33 | |||||||||||||
| 1956 | 26.97 | 17.24 | 29.67 | a | 38.63 | 48.57 | a | 55.43 | 63.16 | 56.68 | 50.47 | 40.39 | 24.30 | 21.55 | 39.42 | |||||||||||
| 1957 | 15.71 | 29.68 | 33.03 | 37.47 | 46.61 | 54.33 | 61.10 | 63.16 | 48.27 | 41.10 | 27.20 | 25.30 | a | 40.25 | ||||||||||||
| 1958 | 18.87 | 31.68 | 30.65 | 37.10 | 50.74 | 58.03 | a | 60.42 | 61.39 | 51.53 | 41.16 | 29.70 | 28.06 | 41.61 | ||||||||||||
| 1959 | 25.65 | 28.32 | 30.74 | 39.53 | 43.42 | 56.77 | 60.84 | 58.52 | 49.83 | 39.74 | 26.97 | 20.61 | 40.08 | |||||||||||||
| 1960 | 17.13 | 21.52 | 31.48 | 37.90 | a | 43.57 | a | 55.57 | 64.16 | 57.00 | 53.87 | 40.45 | 32.79 | a | 22.84 | 39.86 | ||||||||||
| 1961 | 20.77 | 29.82 | 32.26 | 37.90 | 46.10 | 61.87 | 65.06 | 63.35 | 44.80 | 38.26 | 27.24 | a | 21.10 | 40.71 | ||||||||||||
| 1962 | 11.70 | a | 21.65 | b | 26.90 | a | 38.50 | 43.03 | 49.73 | 56.23 | 53.81 | 45.37 | 38.94 | 31.97 | 21.55 | 36.61 | ||||||||||
| 1963 | 13.87 | 32.68 | 30.19 | 35.17 | 49.19 | 50.72 | a | 62.00 | 62.26 | 52.90 | 43.71 | 29.23 | 19.06 | 40.08 | ||||||||||||
| 1964 | 12.65 | 14.55 | 22.00 | a | 36.31 | a | 44.48 | 51.00 | 63.06 | 57.42 | 47.97 | 38.97 | 29.52 | a | 27.00 | 37.08 | ||||||||||
| 1965 | 25.03 | 24.64 | 27.52 | 40.57 | 44.26 | 51.93 | 62.69 | b | 58.26 | 44.70 | 40.45 | 34.50 | 20.33 | a | 39.57 | |||||||||||
| 1966 | 20.65 | 20.04 | 28.68 | 36.87 | 48.35 | 54.17 | 63.04 | c | 57.77 | 53.27 | 36.35 | 32.50 | 19.61 | 39.27 | ||||||||||||
| 1967 | 22.26 | 26.36 | 30.55 | 33.23 | 44.61 | 51.47 | 63.10 | 63.84 | 53.77 | 40.55 | 32.30 | 17.29 | 39.94 | |||||||||||||
| 1968 | 13.58 | 26.04 | a | 32.58 | 33.73 | 45.13 | 53.20 | 62.58 | 55.03 | 47.10 | 37.81 | 27.13 | 21.42 | 37.94 | ||||||||||||
| 1969 | 21.00 | 20.32 | 22.32 | 36.90 | 50.77 | 51.53 | 59.77 | 58.90 | 53.37 | 36.03 | 28.70 | 22.32 | 38.50 | |||||||||||||
| 1970 | 24.65 | 27.32 | 29.52 | 32.23 | 46.42 | 54.73 | 59.10 | 59.61 | 46.50 | 35.29 | 33.13 | 19.16 | 38.97 | |||||||||||||
| 1971 | 22.29 | 23.61 | 29.19 | 37.30 | 44.03 | 53.17 | 63.04 | f | 63.19 | 42.96 | e | 34.58 | 27.60 | 15.10 | 35.73 | a | ||||||||||
| 1972 | 19.03 | a | 24.55 | 32.68 | 34.17 | a | 48.00 | 58.13 | 61.35 | 60.23 | 46.40 | 40.10 | 30.50 | 12.55 | 38.97 | |||||||||||
| 1973 | 15.19 | 16.52 | a | 28.16 | 35.07 | 46.45 | i | 55.24 | i | ----- | z | ----- | z | ----- | z | 37.48 | ----- | z | 23.81 | 26.04 | f | |||||
| 1974 | 15.10 | 18.25 | 28.12 | g | ----- | z | 44.23 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.86 | i | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 16.89 | 22.31 | 28.73 | 37.03 | 45.40 | 53.10 | 60.87 | 58.41 | 48.44 | 38.40 | 28.62 | 20.89 | 38.18 | |||||||||||||
| S.D. | 6.84 | 5.91 | 3.43 | 2.89 | 2.76 | 3.02 | 2.20 | 2.75 | 3.10 | 2.75 | 3.54 | 5.20 | 1.96 | |||||||||||||
| SKEW | -0.31 | -0.72 | -0.74 | 0.28 | -0.25 | 0.52 | -0.16 | -0.04 | 0.04 | 0.13 | -0.23 | -0.67 | -0.39 | |||||||||||||
| MAX | 31.48 | 32.68 | 33.68 | 44.63 | 50.77 | 61.87 | 65.06 | 63.84 | 53.87 | 44.19 | 35.90 | 30.34 | 41.73 | |||||||||||||
| MIN | 3.16 | 3.64 | 19.71 | 32.23 | 39.57 | 47.03 | 56.23 | 52.90 | 42.96 | 33.42 | 20.00 | 7.55 | 33.54 | |||||||||||||
| YRS | 60 | 60 | 57 | 60 | 60 | 58 | 57 | 58 | 56 | 58 | 56 | 59 | 48 | |||||||||||||