| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1893 | 29.63 | a | 35.96 | a | 38.35 | 41.53 | 45.32 | 47.50 | 48.77 | 48.87 | 48.07 | 40.68 | 38.63 | 39.87 | 41.93 | |||||||||||
| 1894 | 36.97 | 33.29 | 36.77 | a | 41.43 | 43.97 | 49.73 | 50.97 | 51.58 | 48.72 | a | ----- | z | 40.07 | 34.10 | 42.51 | ||||||||||
| 1895 | 33.90 | 36.04 | 34.94 | 40.43 | 45.10 | 48.53 | 50.87 | 49.03 | 45.13 | 39.58 | 36.10 | 37.39 | 41.42 | |||||||||||||
| 1896 | 37.60 | a | 37.72 | 37.16 | 39.27 | 44.52 | 47.43 | 52.00 | 53.03 | ----- | z | ----- | z | ----- | z | ----- | z | 43.59 | ||||||||
| 1897 | 35.45 | b | 37.32 | 35.19 | 42.00 | 48.06 | 50.72 | a | 52.48 | 55.52 | 48.43 | 42.39 | 39.07 | 39.16 | 43.82 | |||||||||||
| 1898 | 35.32 | 39.96 | 35.06 | 41.47 | 44.35 | 49.37 | 53.26 | 53.00 | 51.37 | 42.06 | 37.33 | 32.81 | 42.95 | |||||||||||||
| 1899 | 38.35 | 32.11 | a | 34.74 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 35.07 | |||
| 1900 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1901 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1902 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1903 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1904 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1905 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1906 | ----- | z | ----- | z | ----- | z | ----- | z | 46.13 | 47.83 | 54.48 | 50.45 | 47.25 | b | 43.00 | 38.74 | c | 35.45 | 45.42 | |||||||
| 1907 | 30.19 | 37.19 | a | 35.87 | 40.30 | 44.00 | a | 49.90 | j | 52.06 | 50.04 | e | 47.00 | 46.18 | i | 38.07 | 37.61 | 41.23 | ||||||||
| 1908 | 35.97 | 35.66 | 36.10 | 41.21 | a | 43.29 | 49.50 | 53.74 | 49.84 | 43.97 | 40.13 | 40.43 | 33.48 | 41.94 | ||||||||||||
| 1909 | 28.45 | 38.00 | 36.19 | 37.14 | h | 40.65 | 47.03 | 49.61 | 46.71 | 47.00 | 43.48 | 40.37 | 28.87 | 40.58 | ||||||||||||
| 1910 | 31.55 | 32.43 | 39.77 | 40.03 | 46.19 | 46.67 | 50.35 | 46.52 | 45.20 | 44.16 | 38.60 | 36.48 | 41.50 | |||||||||||||
| 1911 | 32.00 | 31.04 | 35.00 | 35.23 | ----- | z | ----- | z | 50.48 | 48.77 | 45.93 | 39.19 | 36.60 | 34.10 | 38.84 | |||||||||||
| 1912 | 35.12 | e | 35.66 | 33.74 | 37.57 | 44.61 | ----- | z | ----- | z | 51.97 | 45.93 | 36.94 | 38.27 | 34.10 | 39.39 | ||||||||||
| 1913 | 32.48 | 29.39 | 35.23 | 38.97 | 44.00 | 49.43 | 52.10 | 52.68 | 45.23 | 40.35 | 37.83 | 33.61 | 40.94 | |||||||||||||
| 1914 | 37.55 | 33.61 | 39.81 | 41.37 | 44.81 | 46.93 | 50.90 | 49.68 | 47.20 | 45.13 | 37.76 | a | 27.77 | 41.88 | ||||||||||||
| 1915 | 30.74 | 35.04 | 38.71 | 41.37 | 44.39 | 47.93 | 53.71 | 51.97 | 46.40 | 40.61 | 38.13 | 33.84 | 41.90 | |||||||||||||
| 1916 | 25.29 | 35.93 | 37.06 | 39.00 | 41.90 | 47.93 | 49.97 | 50.90 | 46.77 | 34.84 | 31.08 | f | 32.10 | 40.15 | ||||||||||||
| 1917 | 30.29 | 32.29 | 31.74 | 38.03 | 43.16 | 45.80 | 51.39 | 49.84 | 49.17 | 38.48 | 37.07 | 40.26 | 40.63 | |||||||||||||
| 1918 | 37.84 | 32.61 | 35.74 | 35.77 | 40.61 | 48.77 | 48.45 | 49.87 | 48.43 | 43.87 | 35.40 | 32.52 | 40.82 | |||||||||||||
| 1919 | 31.55 | 34.61 | 35.77 | 38.30 | 41.13 | 43.90 | 49.26 | 48.90 | 45.57 | 37.94 | 37.40 | 25.35 | 39.14 | |||||||||||||
| 1920 | 33.48 | 31.83 | 35.71 | 37.77 | 39.74 | 48.20 | 51.81 | 52.81 | 48.87 | 43.55 | 36.50 | 37.13 | 41.45 | |||||||||||||
| 1921 | 34.35 | 38.36 | 38.10 | 38.83 | 44.13 | 51.40 | 49.55 | 51.23 | 45.50 | 43.61 | 41.10 | 32.61 | 42.40 | |||||||||||||
| 1922 | 30.23 | 32.57 | 35.65 | 38.00 | 44.19 | 49.87 | 51.65 | 51.97 | 48.73 | 45.19 | 34.23 | 34.42 | 41.39 | |||||||||||||
| 1923 | 36.94 | 30.96 | 35.00 | 40.73 | 44.42 | 49.43 | 54.97 | 54.00 | 48.50 | 42.19 | 37.47 | 33.84 | 42.37 | |||||||||||||
| 1924 | 30.00 | 38.48 | 35.71 | 39.93 | 45.03 | 48.93 | 50.58 | 52.13 | 46.13 | 44.05 | i | 37.77 | 26.06 | 40.98 | ||||||||||||
| 1925 | 39.19 | 39.75 | 37.58 | 43.00 | 47.81 | 50.20 | 54.39 | 51.94 | 49.60 | 41.16 | 39.80 | 37.84 | 44.35 | |||||||||||||
| 1926 | 34.74 | 40.68 | 39.77 | 45.33 | 47.68 | 51.67 | 53.58 | 54.10 | 47.00 | 46.32 | 42.77 | 36.75 | k | 45.79 | ||||||||||||
| 1927 | 35.26 | 37.07 | 39.39 | 40.10 | 44.79 | b | 53.05 | h | 52.35 | 53.32 | 49.70 | 44.74 | 43.20 | 32.39 | 42.94 | |||||||||||
| 1928 | 35.19 | 34.48 | 42.16 | 42.23 | 46.39 | 50.97 | 53.90 | 51.74 | 47.83 | 44.32 | 39.47 | 33.10 | 43.48 | |||||||||||||
| 1929 | 29.26 | 28.89 | 38.23 | 38.43 | 45.06 | 49.43 | 52.06 | 51.81 | 47.47 | 43.48 | 32.90 | 38.26 | 41.27 | |||||||||||||
| 1930 | 23.00 | 39.39 | 38.32 | 43.20 | 43.32 | 47.77 | 51.29 | 52.84 | 50.10 | 40.48 | 36.77 | 33.45 | 41.66 | |||||||||||||
| 1931 | 36.90 | 34.61 | 39.94 | 42.47 | 47.19 | 50.33 | 53.61 | 52.10 | 49.60 | 43.58 | 35.87 | 34.58 | 43.40 | |||||||||||||
| 1932 | 34.48 | 34.93 | 40.97 | 42.00 | 45.65 | 51.03 | 50.81 | 53.35 | 46.97 | 45.16 | 41.50 | 31.16 | 43.17 | |||||||||||||
| 1933 | 34.45 | 32.96 | 38.16 | 39.10 | 43.84 | 49.30 | 51.77 | 53.68 | 47.80 | 44.61 | 38.13 | 41.42 | 42.94 | |||||||||||||
| 1934 | 40.16 | 39.71 | 43.10 | 44.57 | 47.71 | 49.73 | 52.13 | 53.23 | 47.43 | 45.94 | 43.80 | 37.06 | 45.38 | |||||||||||||
| 1935 | 32.39 | 35.96 | 35.29 | 40.77 | 42.39 | 50.73 | 51.90 | 51.81 | 49.63 | 41.74 | 34.07 | 32.77 | 41.62 | |||||||||||||
| 1936 | 36.45 | 30.03 | 36.26 | 43.10 | 48.00 | 52.47 | 53.81 | 53.29 | 48.40 | 42.39 | 30.80 | 37.35 | 42.70 | |||||||||||||
| 1937 | 24.23 | 34.39 | 39.45 | 39.73 | 45.35 | 52.07 | 54.32 | 51.81 | 49.90 | 46.32 | 43.30 | 36.87 | 43.15 | |||||||||||||
| 1938 | 34.26 | 34.54 | 37.74 | 41.70 | 45.32 | 50.60 | 54.81 | 50.81 | 52.70 | 44.19 | 35.47 | 35.42 | 43.13 | |||||||||||||
| 1939 | 36.55 | 34.39 | 38.29 | 42.33 | 45.35 | 49.03 | 53.84 | 53.68 | 50.23 | 45.42 | 40.70 | 40.55 | 44.20 | |||||||||||||
| 1940 | 33.94 | 39.38 | 41.16 | 43.43 | 47.45 | 51.80 | 54.35 | 54.16 | 52.97 | 47.42 | 37.20 | 36.81 | 45.01 | |||||||||||||
| 1941 | 37.06 | 36.50 | 39.84 | 41.93 | 46.52 | 51.17 | 56.71 | 54.26 | 49.13 | 43.81 | 40.03 | 38.35 | 44.61 | |||||||||||||
| 1942 | 29.55 | 35.25 | 35.42 | 41.07 | 45.68 | 48.93 | 56.00 | 54.42 | 47.87 | 41.90 | 38.87 | 38.87 | 42.82 | |||||||||||||
| 1943 | 28.29 | 34.04 | 35.81 | 42.17 | 44.13 | 49.23 | 52.26 | 51.61 | 48.63 | 43.23 | 35.60 | 31.00 | 41.33 | |||||||||||||
| 1944 | 31.10 | 33.52 | 33.35 | 39.53 | 42.97 | 47.63 | 50.06 | 49.19 | 45.60 | 42.58 | 36.20 | 30.84 | 40.22 | |||||||||||||
| 1945 | 35.45 | 35.86 | 36.71 | 39.90 | 47.42 | 47.77 | 51.06 | 48.26 | 42.37 | 36.74 | 41.10 | 36.45 | 41.59 | |||||||||||||
| 1946 | 34.87 | 35.75 | 37.84 | 41.63 | 47.16 | 50.83 | 54.10 | 52.16 | 47.33 | 39.68 | 34.97 | 36.19 | 42.71 | |||||||||||||
| 1947 | 31.26 | 35.36 | 38.77 | 42.93 | 47.35 | 50.37 | 52.52 | 51.52 | 49.10 | 46.74 | 38.63 | 34.48 | 43.25 | |||||||||||||
| 1948 | 30.48 | 32.34 | 35.39 | 39.40 | 45.45 | 52.67 | ----- | z | 51.74 | 46.43 | 40.45 | 35.60 | 30.10 | 40.01 | ||||||||||||
| 1949 | 20.90 | 33.07 | 37.94 | 41.45 | a | 46.16 | 47.37 | 50.68 | 51.16 | 48.67 | 36.65 | 39.27 | 32.97 | 40.52 | ||||||||||||
| 1950 | 24.52 | 31.57 | 37.10 | 40.17 | 43.10 | 51.57 | 53.71 | 53.48 | 48.23 | 45.58 | 40.50 | 42.48 | 42.67 | |||||||||||||
| 1951 | 34.74 | 35.86 | 33.74 | 40.47 | 44.87 | 49.43 | 51.90 | b | 49.90 | 46.37 | 43.45 | 37.67 | 32.67 | a | 41.76 | |||||||||||
| 1952 | 32.19 | 33.31 | 35.39 | 38.63 | 43.06 | 46.37 | 50.45 | 49.68 | 46.83 | 43.26 | 30.97 | 34.84 | 40.42 | |||||||||||||
| 1953 | 41.39 | 35.43 | 36.00 | 40.50 | 44.35 | 48.77 | 52.10 | 53.29 | 48.97 | 41.87 | 40.13 | 36.19 | 43.25 | |||||||||||||
| 1954 | 33.74 | 33.61 | 31.35 | 38.80 | 44.90 | 48.40 | 51.35 | 52.32 | 48.17 | 39.65 | 42.40 | 33.68 | 41.53 | |||||||||||||
| 1955 | 33.13 | 32.50 | 33.45 | 37.30 | 42.13 | 49.30 | 51.03 | 50.65 | 47.60 | 44.42 | 36.93 | 36.35 | 41.23 | |||||||||||||
| 1956 | 36.52 | 31.45 | 35.80 | a | 40.27 | 47.65 | 48.33 | 53.42 | 53.13 | 48.70 | 42.06 | 34.13 | 35.48 | 42.24 | ||||||||||||
| 1957 | 26.10 | 35.11 | 39.71 | 41.57 | 48.74 | 51.43 | 50.48 | 49.00 | 47.60 | 40.71 | 29.33 | 35.90 | 41.31 | |||||||||||||
| 1958 | 36.90 | 42.32 | 35.74 | 41.77 | 48.87 | 55.33 | 56.84 | 55.81 | 49.67 | 42.97 | 39.90 | 40.16 | 45.52 | |||||||||||||
| 1959 | 38.06 | 34.86 | 37.29 | 41.17 | 44.61 | 51.33 | 54.06 | 52.42 | 49.10 | 44.13 | 34.67 | 34.26 | 43.00 | |||||||||||||
| 1960 | 30.84 | 35.14 | 36.87 | 40.53 | 44.39 | 49.00 | 50.03 | 48.19 | 46.80 | 42.06 | 37.93 | 32.29 | 41.17 | |||||||||||||
| 1961 | 36.19 | 40.04 | 39.03 | 40.43 | 45.61 | 50.70 | 52.84 | 53.52 | 44.67 | 40.71 | 32.97 | 36.06 | 42.73 | |||||||||||||
| 1962 | 30.19 | 33.79 | 35.65 | 40.83 | 41.68 | 45.10 | 47.45 | 48.42 | 46.97 | 42.26 | 39.10 | 34.97 | 40.53 | |||||||||||||
| 1963 | 25.45 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 25.45 | ||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 32.98 | 35.01 | 36.94 | 40.53 | 44.90 | 49.34 | 52.15 | 51.57 | 47.78 | 42.37 | 37.80 | 34.86 | 42.28 | |||||||||||||
| S.D. | 4.32 | 2.88 | 2.35 | 1.94 | 2.06 | 2.00 | 1.98 | 2.05 | 1.92 | 2.70 | 3.03 | 3.46 | 1.37 | |||||||||||||
| SKEW | -0.66 | 0.29 | 0.21 | -0.27 | -0.24 | -0.01 | 0.15 | -0.37 | 0.07 | -0.58 | -0.44 | -0.33 | 0.37 | |||||||||||||
| MAX | 41.39 | 42.32 | 43.10 | 45.33 | 48.87 | 55.33 | 56.84 | 55.81 | 52.97 | 47.42 | 43.80 | 42.48 | 45.52 | |||||||||||||
| MIN | 20.90 | 28.89 | 31.35 | 35.23 | 39.74 | 43.90 | 47.45 | 46.52 | 42.37 | 34.84 | 29.33 | 25.35 | 39.14 | |||||||||||||
| NO YRS | 64 | 63 | 63 | 61 | 62 | 59 | 61 | 63 | 62 | 59 | 61 | 61 | 51 | |||||||||||||