| 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 | 62.72 | a | 71.58 | 79.14 | b | 84.52 | 86.87 | 79.18 | h | 59.77 | i | 53.80 | 40.20 | a | 68.40 | e | ||||
| 1914 | 40.81 | 39.86 | 53.87 | a | 59.77 | 72.94 | 74.75 | b | 85.48 | b | 87.11 | c | 75.28 | a | 65.80 | a | 58.52 | a | 36.75 | c | 62.58 | |||||
| 1915 | 34.47 | a | 44.33 | a | 55.10 | a | 71.11 | b | 66.82 | c | 76.29 | b | 86.79 | c | 90.30 | a | 75.47 | 72.03 | a | 51.79 | a | 39.90 | b | 63.70 | ||
| 1916 | 34.82 | c | 39.93 | 54.83 | a | 61.76 | a | 64.32 | 78.07 | 88.81 | 86.45 | 78.07 | 61.23 | 45.53 | 33.80 | a | 60.63 | |||||||||
| 1917 | 28.70 | h | 35.82 | 38.57 | a | 54.41 | a | 61.65 | 77.97 | a | 90.31 | b | 86.08 | e | 77.70 | 66.55 | 52.23 | 47.41 | b | 62.61 | a | |||||
| 1918 | 37.80 | a | 37.86 | 53.57 | a | 58.43 | 68.96 | g | 88.09 | h | 87.26 | d | 87.32 | i | 78.67 | 66.10 | 51.41 | a | 39.07 | a | 56.68 | c | ||||
| 1919 | 41.90 | 40.61 | 53.26 | 63.13 | 75.61 | 85.20 | 92.54 | c | 89.87 | a | 80.13 | 58.13 | ----- | z | ----- | z | 68.04 | b | ||||||||
| 1920 | ----- | z | ----- | z | ----- | z | 51.87 | 68.55 | 79.63 | 90.84 | 86.74 | 75.40 | 56.03 | b | 45.53 | 37.03 | 65.74 | c | ||||||||
| 1921 | 39.33 | a | 42.82 | 54.03 | 56.13 | 68.45 | 81.83 | 90.52 | 85.10 | 73.53 | 68.35 | 53.37 | 40.74 | 62.85 | ||||||||||||
| 1922 | 28.23 | 35.32 | 43.00 | a | 55.00 | 72.60 | a | 87.24 | a | 90.16 | 88.90 | 83.73 | 69.55 | 47.40 | 38.06 | 61.60 | ||||||||||
| 1923 | 41.94 | 35.29 | 47.90 | 60.10 | a | 72.80 | a | 78.23 | 90.07 | b | 85.00 | 79.31 | a | 59.83 | a | 54.40 | 36.07 | a | 61.75 | |||||||
| 1924 | 32.06 | 47.10 | 46.10 | a | 63.07 | 77.06 | 82.73 | 87.65 | 85.00 | 74.60 | 59.71 | 47.57 | 30.37 | a | 61.09 | |||||||||||
| 1925 | 34.48 | 47.19 | a | 55.74 | 63.40 | 76.16 | 77.57 | 91.71 | 84.94 | 75.90 | 63.87 | 48.87 | 41.23 | 63.42 | ||||||||||||
| 1926 | 37.13 | 45.79 | 55.87 | 67.03 | 72.90 | 85.83 | 91.13 | 87.74 | 75.30 | 68.42 | 55.27 | 37.68 | 65.01 | |||||||||||||
| 1927 | 38.16 | 41.96 | 48.23 | 58.40 | 66.81 | 80.23 | 89.90 | 86.61 | 76.87 | 67.77 | 53.47 | 35.19 | 61.97 | |||||||||||||
| 1928 | 35.42 | 42.34 | 55.23 | 59.70 | 77.94 | 79.10 | 91.58 | 88.13 | 81.87 | 66.13 | 48.93 | 33.61 | 63.33 | |||||||||||||
| 1929 | 32.58 | 35.04 | 49.84 | 57.83 | 73.06 | 81.57 | 92.52 | 91.06 | 73.77 | 67.61 | 49.70 | 46.03 | 62.55 | |||||||||||||
| 1930 | 30.39 | 47.00 | a | 52.97 | 69.63 | 68.72 | b | 84.23 | 94.13 | 87.68 | 79.59 | a | 62.03 | b | 44.87 | 28.26 | 62.46 | |||||||||
| 1931 | 31.19 | 41.04 | 51.61 | 65.80 | 75.42 | 89.73 | 97.97 | 92.94 | 80.50 | 68.39 | 46.97 | 34.50 | a | 64.67 | ||||||||||||
| 1932 | 30.42 | 39.52 | 47.58 | 63.07 | a | 75.45 | 83.07 | 92.32 | 90.79 | b | 83.39 | b | 64.81 | 53.47 | 29.93 | a | 62.82 | |||||||||
| 1933 | 34.29 | 28.75 | 49.23 | 59.90 | 68.00 | a | 90.73 | 96.71 | 89.97 | 82.70 | 75.61 | 55.07 | 47.48 | 64.87 | ||||||||||||
| 1934 | 42.74 | 52.00 | 62.81 | 72.90 | 83.68 | 84.17 | 94.74 | 94.23 | 79.24 | a | 71.61 | 54.30 | 41.06 | 69.46 | ||||||||||||
| 1935 | 42.94 | 46.50 | 51.90 | a | 63.07 | 67.70 | a | 86.79 | b | 92.94 | 91.27 | a | 83.54 | b | 67.77 | 46.30 | 40.73 | a | 65.12 | |||||||
| 1936 | 36.74 | 39.59 | 51.52 | b | 65.70 | 80.60 | a | 85.93 | c | 93.07 | a | 90.14 | c | 80.58 | d | 68.52 | f | 51.15 | c | 41.48 | 65.14 | a | ||||
| 1937 | 24.63 | d | 38.92 | c | 49.27 | a | 59.11 | c | 78.15 | d | 82.48 | c | 92.77 | a | 93.74 | 84.57 | b | 69.71 | 53.33 | 44.48 | 64.26 | |||||
| 1938 | 46.96 | f | 49.25 | 54.83 | a | 65.41 | a | 73.63 | d | 88.47 | 92.39 | 93.36 | c | 87.28 | a | 65.35 | 40.17 | 39.55 | 68.15 | a | ||||||
| 1939 | 36.03 | a | 32.25 | 50.74 | 65.90 | 75.35 | 79.33 | 90.35 | 88.52 | b | 76.17 | 63.97 | 54.60 | 45.71 | 63.24 | |||||||||||
| 1940 | 37.00 | 45.52 | 55.26 | 63.03 | 79.10 | 89.17 | 92.74 | 91.84 | 75.90 | 65.39 | 44.07 | 39.45 | 64.87 | |||||||||||||
| 1941 | 35.97 | 42.79 | 53.55 | 59.23 | 75.00 | 79.43 | 89.97 | 85.19 | 73.80 | 62.58 | 52.13 | 41.42 | 62.59 | |||||||||||||
| 1942 | 29.97 | 35.07 | 43.94 | 65.30 | 67.19 | 79.50 | 93.55 | 89.87 | ----- | z | ----- | z | 49.90 | i | 38.27 | e | 60.30 | c | ||||||||
| 1943 | 37.71 | 39.82 | 41.30 | u | ----- | z | ----- | z | 82.87 | o | 91.06 | 89.32 | 81.97 | 70.29 | g | 51.30 | 41.19 | 61.77 | e | |||||||
| 1944 | 31.62 | e | 39.03 | 43.74 | 55.80 | 71.42 | 74.07 | a | 89.52 | 90.00 | 78.37 | 71.42 | 44.90 | 37.97 | 60.65 | |||||||||||
| 1945 | 40.35 | 42.36 | 46.16 | 53.79 | a | 69.58 | 71.93 | 91.06 | 86.38 | b | 72.17 | 66.66 | b | 46.62 | i | 38.08 | e | 61.68 | a | |||||||
| 1946 | 35.71 | 40.76 | c | 52.36 | f | 64.72 | a | 67.54 | c | 82.15 | c | 89.41 | b | 88.73 | a | 79.97 | a | 56.43 | c | 47.39 | b | 45.03 | b | 63.44 | a | |
| 1947 | 32.16 | 47.11 | 55.26 | 60.33 | c | 77.04 | c | 76.63 | 95.52 | f | 89.55 | b | ----- | z | ----- | z | ----- | z | 34.80 | a | 59.11 | d | ||||
| 1948 | 34.61 | 40.31 | 42.41 | d | 59.83 | 73.55 | 79.63 | 91.67 | a | 90.61 | 75.07 | a | 67.19 | 43.33 | 33.61 | 60.99 | ||||||||||
| 1949 | 20.52 | 33.96 | 51.48 | 68.70 | 74.19 | 81.43 | 91.32 | 91.65 | 83.03 | a | 59.68 | 56.63 | 37.97 | 62.55 | ||||||||||||
| 1950 | 34.16 | 44.14 | 49.52 | 59.20 | 67.10 | 78.80 | 87.77 | 87.71 | 76.03 | 72.00 | 49.83 | 37.55 | 61.98 | |||||||||||||
| 1951 | 35.10 | 40.11 | 46.13 | 62.30 | 70.19 | 77.93 | 91.03 | 84.61 | 79.27 | 61.58 | 46.60 | 34.52 | 60.78 | |||||||||||||
| 1952 | 34.39 | 36.62 | 40.03 | 64.43 | 73.13 | 80.90 | 89.39 | 88.71 | 83.27 | 73.48 | 45.07 | a | 39.32 | 62.40 | ||||||||||||
| 1953 | 47.55 | 45.43 | 55.26 | 58.03 | a | 63.84 | 80.37 | 94.19 | 90.35 | 84.00 | 67.58 | 56.87 | 37.42 | 65.07 | ||||||||||||
| 1954 | 42.03 | 43.11 | 48.94 | 66.47 | 76.60 | a | 81.83 | a | 94.90 | 89.42 | 81.93 | a | 68.48 | 51.63 | 37.77 | 65.26 | ||||||||||
| 1955 | 29.00 | 33.07 | 44.43 | a | 58.31 | a | 72.39 | 79.67 | 90.68 | 90.39 | 79.43 | 67.39 | 45.77 | 43.10 | 61.13 | |||||||||||
| 1956 | 43.77 | a | 33.38 | 52.29 | 61.67 | 73.52 | 84.63 | 92.74 | 88.52 | 83.70 | 65.16 | 43.83 | 38.19 | 63.45 | ||||||||||||
| 1957 | 33.32 | 48.14 | 53.10 | 58.63 | 70.35 | 81.43 | 91.29 | 89.84 | 80.57 | 63.00 | b | 41.93 | 40.74 | 62.70 | ||||||||||||
| 1958 | 36.61 | 48.86 | 48.23 | 58.50 | 79.42 | 84.57 | 90.03 | a | 92.74 | 80.77 | 70.13 | 48.43 | 43.19 | 65.12 | ||||||||||||
| 1959 | 40.45 | 42.86 | 51.81 | 64.30 | 69.06 | 87.93 | 93.68 | 89.90 | 73.97 | 64.13 | 51.70 | 40.03 | 64.15 | |||||||||||||
| 1960 | 31.35 | 35.93 | 53.58 | 63.69 | a | 72.40 | a | 86.13 | 96.42 | 89.35 | 83.47 | 65.10 | 50.67 | 40.23 | 64.03 | |||||||||||
| 1961 | 40.97 | 45.43 | 51.77 | 61.83 | 75.00 | 89.70 | 94.16 | 92.35 | 72.00 | 63.74 | 47.47 | 37.61 | 64.34 | |||||||||||||
| 1962 | 29.47 | a | 38.57 | 47.94 | 66.77 | 70.74 | 83.23 | 91.52 | 90.52 | 85.79 | a | 72.32 | 56.37 | 40.68 | 64.49 | |||||||||||
| 1963 | 33.74 | 52.11 | 54.35 | 56.70 | 77.45 | 77.77 | 94.77 | 93.97 | 84.03 | 73.39 | 49.67 | 33.06 | 65.08 | |||||||||||||
| 1964 | 32.10 | 34.97 | 42.77 | 58.50 | 71.68 | 76.63 | 95.68 | 89.29 | 81.10 | 72.84 | 48.70 | 42.03 | 62.19 | |||||||||||||
| 1965 | 39.71 | 44.89 | 53.26 | 62.77 | 70.65 | 81.33 | 91.94 | 86.94 | 70.93 | 71.26 | 56.10 | 38.68 | 64.04 | |||||||||||||
| 1966 | 38.90 | 39.46 | 55.48 | 63.53 | 77.77 | 84.23 | 95.10 | 89.23 | 80.13 | 63.32 | 51.93 | 34.16 | 64.44 | |||||||||||||
| 1967 | 38.32 | 48.36 | 54.74 | 57.53 | 72.74 | 77.53 | 93.42 | 95.26 | 79.80 | 64.35 | 55.73 | 33.16 | 64.25 | |||||||||||||
| 1968 | 33.32 | 45.41 | 57.45 | 57.57 | 72.32 | 81.80 | 93.81 | 82.68 | 76.80 | 65.93 | a | 46.63 | 38.23 | 62.66 | ||||||||||||
| 1969 | 40.65 | 39.86 | 48.52 | 64.53 | 80.74 | 78.70 | 94.23 | 96.16 | 84.87 | 58.47 | a | 50.17 | 42.06 | 64.91 | ||||||||||||
| 1970 | 40.00 | 51.82 | 50.94 | 56.40 | 73.84 | 84.27 | 93.10 | 95.29 | 75.93 | 59.00 | 50.63 | 36.94 | 64.01 | |||||||||||||
| 1971 | 38.77 | 43.68 | 50.65 | 64.14 | a | 70.97 | 83.37 | 95.73 | a | 94.87 | 76.47 | 61.19 | 47.97 | 34.79 | b | 63.55 | ||||||||||
| 1972 | 38.30 | a | 46.38 | 62.26 | 62.07 | 77.10 | 86.07 | 94.29 | 92.65 | 76.10 | 64.84 | 45.93 | 30.19 | 64.68 | ||||||||||||
| 1973 | 29.42 | 39.96 | 49.39 | 59.53 | 75.74 | 87.00 | e | ----- | z | ----- | z | ----- | z | 68.65 | ----- | z | 40.71 | 56.30 | d | |||||||
| 1974 | 35.81 | 39.00 | 56.93 | a | ----- | z | 77.81 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.39 | h | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 35.71 | 41.57 | 51.02 | 61.54 | 72.89 | 81.87 | 91.85 | 89.53 | 79.01 | 65.95 | 49.95 | 38.48 | 63.41 | |||||||||||||
| S.D. | 4.96 | 5.26 | 4.92 | 4.28 | 4.47 | 4.19 | 2.71 | 3.02 | 3.92 | 4.57 | 4.24 | 4.20 | 1.64 | |||||||||||||
| SKEW | -0.36 | -0.05 | -0.30 | 0.24 | -0.13 | 0.11 | -0.33 | 0.12 | -0.02 | -0.14 | -0.08 | -0.13 | 0.71 | |||||||||||||
| MAX | 47.55 | 52.11 | 62.81 | 72.90 | 83.68 | 90.73 | 97.97 | 96.16 | 87.28 | 75.61 | 58.52 | 47.48 | 69.46 | |||||||||||||
| MIN | 20.52 | 28.75 | 38.57 | 51.87 | 61.65 | 71.93 | 84.52 | 82.68 | 70.93 | 56.03 | 40.17 | 28.26 | 60.63 | |||||||||||||
| YRS | 58 | 60 | 58 | 60 | 60 | 59 | 59 | 59 | 57 | 56 | 56 | 60 | 48 | |||||||||||||