| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1901 | 37.87 | 42.79 | 49.06 | m | 60.03 | 74.32 | 80.97 | 91.97 | 86.03 | 77.83 | 65.52 | 54.27 | 45.23 | 65.17 | a | |||||||||||
| 1902 | 40.52 | 44.21 | 43.97 | 56.13 | 61.35 | 73.97 | a | 74.77 | a | 75.10 | a | 72.57 | 59.53 | a | 47.62 | a | 35.26 | 57.08 | ||||||||
| 1903 | 40.29 | 33.00 | 47.26 | 54.70 | 61.48 | 69.90 | a | 75.93 | a | ----- | z | 64.00 | a | 65.00 | 57.43 | 41.06 | 55.46 | a | ||||||||
| 1904 | 36.00 | 47.86 | 47.71 | 55.07 | b | 60.03 | 67.55 | a | 73.26 | 71.97 | a | 65.93 | 50.79 | b | 48.13 | 35.23 | a | 54.96 | ||||||||
| 1905 | 33.97 | 36.71 | 45.26 | 51.37 | 55.74 | 70.13 | 71.73 | a | 72.10 | 67.43 | 56.03 | a | 45.47 | ----- | z | 55.09 | a | |||||||||
| 1906 | 37.32 | i | 46.00 | 47.90 | 59.73 | 70.16 | 76.83 | 81.71 | 84.42 | 73.73 | 67.58 | 49.33 | 43.21 | b | 63.69 | a | ||||||||||
| 1907 | 39.52 | 51.39 | 57.77 | 67.20 | 67.81 | 73.60 | 85.35 | 84.23 | 75.23 | 71.84 | 60.17 | 46.23 | 65.03 | |||||||||||||
| 1908 | 43.58 | 45.72 | 63.58 | 68.13 | 74.45 | 77.53 | 85.71 | 82.23 | 76.30 | 60.00 | 54.37 | 44.42 | 64.67 | |||||||||||||
| 1909 | 44.50 | q | 46.22 | a | 52.13 | 61.90 | 70.45 | 83.83 | 85.68 | 83.48 | 80.83 | 73.77 | 65.78 | l | 35.60 | a | 67.39 | b | ||||||||
| 1910 | 37.55 | 42.36 | 61.68 | 68.18 | b | 70.45 | b | 79.24 | a | 83.39 | c | 82.08 | e | 74.29 | b | 67.73 | a | 54.10 | a | 47.13 | 64.01 | |||||
| 1911 | 45.61 | 41.82 | 50.84 | 57.00 | a | 73.16 | 77.97 | 81.26 | 82.29 | 79.90 | 58.03 | a | 41.23 | 49.81 | 61.58 | |||||||||||
| 1912 | 43.65 | 51.00 | a | 48.81 | 54.59 | a | 68.71 | 80.21 | a | 79.90 | 81.13 | 64.23 | 58.92 | e | 56.70 | 49.93 | c | 61.48 | ||||||||
| 1913 | 36.65 | 48.65 | b | 52.16 | 60.97 | a | 76.23 | 79.93 | 78.90 | 80.57 | a | 78.57 | 66.97 | 53.73 | 48.35 | 63.47 | ||||||||||
| 1914 | 41.29 | 43.50 | 56.19 | 64.57 | 73.39 | 65.10 | a | 73.23 | 73.97 | 76.50 | 66.19 | 55.80 | 45.42 | 61.26 | ||||||||||||
| 1915 | 39.90 | 36.85 | a | 45.50 | a | 56.63 | 61.13 | a | 71.90 | 77.81 | 78.21 | c | 73.43 | 70.03 | 53.71 | b | 43.00 | 59.01 | ||||||||
| 1916 | 36.87 | 43.48 | 56.32 | 66.30 | 72.74 | 81.53 | 83.77 | 80.42 | 78.53 | 67.58 | 53.67 | 41.81 | 63.59 | |||||||||||||
| 1917 | 34.00 | c | 44.04 | 50.65 | 55.63 | 60.77 | 81.21 | a | 89.19 | 86.68 | 82.53 | 66.06 | 60.83 | 49.19 | 63.40 | |||||||||||
| 1918 | 41.23 | 46.25 | 55.10 | 63.00 | 71.71 | 83.87 | 81.06 | 79.45 | 74.83 | 70.84 | 54.67 | 38.52 | 63.38 | |||||||||||||
| 1919 | 33.35 | 37.14 | 50.00 | 64.39 | b | 75.40 | a | 82.73 | 88.10 | 86.39 | 79.83 | 61.76 | b | 57.68 | b | 40.00 | 63.06 | |||||||||
| 1920 | 39.52 | 45.69 | 49.03 | 53.80 | 74.42 | 80.03 | 85.74 | 83.74 | 80.30 | 72.06 | 50.23 | 38.52 | 62.76 | |||||||||||||
| 1921 | 38.31 | b | 49.75 | 55.53 | a | 60.97 | 66.04 | d | 82.67 | ----- | z | ----- | z | ----- | z | ----- | z | 48.75 | n | 40.72 | m | 58.88 | f | |||
| 1922 | 32.45 | 35.86 | 44.15 | d | 53.36 | b | 68.97 | 81.33 | 84.26 | 79.45 | 74.93 | 62.06 | 46.17 | a | 40.64 | f | 60.27 | a | ||||||||
| 1923 | 43.68 | f | 38.30 | e | 46.31 | b | 55.97 | a | 68.36 | t | 76.50 | f | 87.38 | r | 81.22 | v | 74.92 | r | 56.83 | a | 48.89 | l | 35.29 | n | 49.35 | h |
| 1924 | 35.97 | b | 48.27 | n | ----- | z | 57.87 | 74.36 | q | 83.20 | 84.90 | 83.34 | b | 72.17 | 59.63 | a | 48.23 | 30.71 | 61.78 | c | ||||||
| 1925 | 30.40 | a | 42.60 | m | 51.23 | 60.62 | a | 73.52 | 75.00 | 85.04 | d | 80.15 | e | 68.60 | 58.55 | 45.31 | a | 42.06 | 60.95 | a | ||||||
| 1926 | 38.52 | 44.25 | 51.55 | 60.50 | 68.03 | 81.63 | 83.61 | h | 80.65 | 72.60 | 62.47 | n | 49.90 | 33.97 | a | 58.16 | b | |||||||||
| 1927 | 41.33 | v | 42.29 | 46.81 | 58.80 | 69.00 | f | 77.57 | 83.32 | 76.65 | 74.33 | x | 62.58 | 47.17 | x | 34.19 | o | 64.00 | e | |||||||
| 1928 | 40.97 | 41.28 | 49.50 | a | 55.75 | b | 68.67 | a | 75.43 | 84.84 | 80.19 | 74.50 | 58.71 | 44.07 | 35.81 | 59.14 | ||||||||||
| 1929 | 34.26 | 32.00 | 48.32 | 53.97 | 65.97 | 77.87 | 84.15 | e | 80.19 | 69.70 | 61.07 | a | 48.17 | a | 43.13 | a | 58.23 | |||||||||
| 1930 | 25.55 | 43.93 | 48.30 | a | 63.87 | 64.29 | 79.37 | 81.45 | 78.26 | 68.97 | 58.00 | 47.80 | 38.58 | 58.20 | ||||||||||||
| 1931 | 39.97 | 45.68 | 48.23 | 61.93 | 68.23 | 79.93 | 88.42 | 82.73 | a | 75.27 | 62.61 | 43.87 | 33.42 | 60.86 | ||||||||||||
| 1932 | 29.87 | 43.10 | 48.00 | b | 57.61 | b | 67.55 | 77.80 | 82.81 | 81.77 | 76.77 | 61.70 | a | 51.23 | 28.24 | f | 61.66 | a | ||||||||
| 1933 | 31.65 | 28.77 | b | 50.94 | 54.73 | 61.10 | 81.30 | 84.42 | 80.77 | 77.13 | 68.13 | 54.70 | 42.84 | 59.71 | ||||||||||||
| 1934 | 42.68 | 49.57 | 59.52 | 66.23 | 74.48 | 75.50 | 86.77 | 83.48 | 74.20 | 66.42 | 50.17 | 42.74 | 64.31 | |||||||||||||
| 1935 | 39.97 | 46.18 | 47.42 | 54.10 | 61.74 | 80.20 | 83.19 | 80.58 | 75.23 | 61.77 | 47.03 | 39.65 | 59.76 | |||||||||||||
| 1936 | 38.52 | 39.66 | 53.00 | 62.63 | 71.87 | 80.00 | 81.71 | 79.97 | 71.13 | 57.23 | 49.93 | a | 37.52 | 60.26 | ||||||||||||
| 1937 | 21.13 | 34.50 | 47.81 | 57.80 | 72.65 | 76.13 | 81.06 | 82.13 | 74.97 | 64.23 | 52.13 | 40.39 | 58.74 | |||||||||||||
| 1938 | 39.87 | 40.25 | 47.55 | 60.23 | 65.97 | 78.13 | 81.65 | 80.84 | 73.57 | 62.63 | a | 42.60 | 40.10 | b | 59.45 | |||||||||||
| 1939 | 35.39 | 28.54 | 49.39 | 62.90 | 70.06 | 76.34 | a | 84.60 | a | 82.06 | 70.80 | 62.81 | 53.87 | ----- | z | 61.52 | a | |||||||||
| 1940 | 34.09 | t | 41.97 | 54.03 | b | 60.80 | 74.16 | 82.53 | 85.39 | 83.52 | 70.53 | 63.45 | 44.76 | a | 36.65 | 63.44 | a | |||||||||
| 1941 | 35.84 | 41.93 | 48.68 | 53.07 | 68.53 | a | 72.47 | 81.52 | 79.55 | 69.20 | 56.45 | 50.03 | a | 37.71 | 57.91 | |||||||||||
| 1942 | 36.39 | 34.00 | 47.23 | 59.53 | 66.32 | 76.55 | a | 84.03 | 81.61 | 73.90 | 63.42 | 51.17 | 45.00 | 59.93 | ||||||||||||
| 1943 | 42.20 | a | 47.86 | 50.87 | 66.30 | 67.71 | 73.60 | 83.68 | 79.97 | 76.90 | 63.03 | 50.27 | 36.42 | 61.57 | ||||||||||||
| 1944 | 34.32 | c | 35.62 | e | 46.45 | 53.17 | 67.19 | 72.27 | 82.12 | f | 81.90 | 76.20 | 65.29 | 46.77 | 45.16 | 56.76 | a | |||||||||
| 1945 | 42.55 | 43.14 | 46.32 | 52.27 | d | 69.18 | i | 71.10 | 82.32 | 80.10 | 73.23 | 62.39 | 46.87 | 35.16 | 57.77 | a | ||||||||||
| 1946 | 34.94 | 42.75 | 52.03 | 66.15 | d | 64.80 | a | 79.30 | 82.84 | 80.35 | 74.90 | 54.90 | 42.33 | 42.06 | 59.78 | |||||||||||
| 1947 | 38.74 | 47.57 | 53.94 | 57.53 | 71.65 | 70.47 | 82.35 | 76.84 | 76.20 | 63.03 | 41.03 | 36.61 | 59.66 | |||||||||||||
| 1948 | 37.65 | 38.17 | 41.90 | 60.23 | 69.35 | 75.17 | 82.42 | 80.50 | a | 76.80 | 62.65 | 43.63 | 36.32 | 58.73 | ||||||||||||
| 1949 | 26.65 | 31.18 | 48.45 | 63.17 | 65.87 | 73.90 | 82.06 | 82.03 | 75.47 | 59.23 | 59.63 | 35.03 | a | 58.56 | ||||||||||||
| 1950 | 32.52 | 43.68 | 50.65 | 62.97 | 65.52 | 78.30 | 80.06 | 80.90 | 71.60 | 70.52 | 54.07 | 45.74 | 61.38 | |||||||||||||
| 1951 | 39.52 | 42.14 | 49.77 | 59.93 | 66.81 | 73.53 | 84.68 | 77.58 | 75.43 | 59.87 | 42.50 | 32.65 | 58.70 | |||||||||||||
| 1952 | 33.06 | 37.93 | 40.29 | 59.70 | 69.55 | 76.83 | 81.94 | 81.26 | 75.30 | 70.61 | 44.93 | 34.35 | 58.81 | |||||||||||||
| 1953 | 41.74 | 43.14 | 53.06 | 57.30 | 62.16 | 77.90 | 83.74 | 78.10 | 77.23 | 62.23 | 50.73 | 37.10 | 60.37 | |||||||||||||
| 1954 | 39.23 | 53.57 | 49.52 | 65.70 | 71.87 | 76.43 | 84.87 | 81.10 | 73.47 | 65.77 | 53.90 | 35.32 | 62.56 | |||||||||||||
| 1955 | 32.19 | 31.39 | 46.74 | 57.33 | 67.65 | 75.70 | 83.77 | 80.94 | 76.70 | 66.06 | 45.23 | 40.00 | 58.64 | |||||||||||||
| 1956 | 41.43 | a | 36.50 | a | 54.58 | 60.03 | 69.87 | 81.27 | 82.94 | 79.81 | 77.73 | 60.87 | 42.12 | d | ----- | z | 62.47 | a | ||||||||
| 1957 | 29.56 | d | 43.79 | 51.10 | 55.47 | 62.32 | 76.27 | 81.35 | 77.97 | 73.83 | 57.32 | 42.43 | 41.29 | 57.72 | ||||||||||||
| 1958 | 40.90 | 46.00 | 44.61 | 56.03 | 73.52 | 81.20 | 83.39 | 84.61 | 74.13 | 65.71 | 50.77 | 48.61 | 62.46 | |||||||||||||
| 1959 | 40.03 | 42.07 | 52.19 | 63.13 | 69.15 | d | 83.80 | 88.03 | 82.81 | 73.55 | a | 64.90 | 52.72 | a | 41.13 | 62.79 | ||||||||||
| 1960 | 31.23 | e | 34.86 | 52.93 | a | 62.47 | 70.13 | h | 83.04 | b | 88.71 | 86.45 | 77.26 | c | 61.48 | 48.45 | a | 41.00 | 60.72 | a | ||||||
| 1961 | 43.70 | a | 45.57 | 48.77 | 58.93 | 70.37 | a | 83.59 | h | 86.74 | 81.97 | b | 68.21 | a | 62.77 | a | 46.00 | 34.23 | 58.84 | a | ||||||
| 1962 | 39.13 | 43.29 | 46.23 | 66.00 | d | 69.06 | 78.53 | 84.61 | 84.77 | 76.00 | 65.90 | 56.20 | 45.45 | 62.93 | ||||||||||||
| 1963 | 32.42 | 50.43 | 47.81 | 55.03 | 74.03 | 76.60 | 86.77 | 82.10 | 75.97 | 69.52 | 51.67 | 41.26 | 61.97 | |||||||||||||
| 1964 | 37.13 | 40.90 | 44.29 | 57.20 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 71.45 | 45.83 | 37.36 | c | 47.74 | e | ||||||
| 1965 | 41.19 | 42.54 | 46.03 | 57.76 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.27 | o | 37.97 | 45.10 | g | ||||
| 1966 | 35.52 | 36.04 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 86.48 | ----- | z | ----- | z | 55.90 | 37.03 | 50.19 | g | |||||
| 1967 | 37.00 | ----- | z | ----- | z | ----- | z | 67.73 | a | 72.58 | d | 87.52 | 86.00 | 76.97 | 72.42 | 56.95 | h | 33.61 | 66.73 | d | ||||||
| 1968 | 33.10 | 46.90 | 56.19 | 55.52 | c | 68.96 | c | 81.57 | 85.42 | 76.65 | 77.83 | 67.81 | 53.83 | 35.37 | a | 61.60 | ||||||||||
| 1969 | 41.23 | 37.39 | 45.13 | 62.83 | 77.52 | 75.90 | 86.97 | a | 87.10 | 78.70 | 59.87 | 54.74 | g | 45.77 | 63.49 | a | ||||||||||
| 1970 | 40.19 | ----- | z | 50.32 | 55.87 | 73.13 | 78.70 | 85.29 | 85.94 | 73.37 | 59.00 | 49.43 | 39.97 | 62.84 | a | |||||||||||
| 1971 | 39.65 | 41.70 | a | 50.70 | a | 60.13 | 67.00 | ----- | z | ----- | z | 84.06 | 74.10 | 58.90 | ----- | z | ----- | z | 59.53 | d | ||||||
| 1972 | 40.61 | 48.34 | 61.84 | 62.33 | 73.06 | 80.40 | 87.35 | 83.00 | 74.57 | b | 59.71 | c | 42.86 | a | ----- | z | 64.92 | a | ||||||||
| 1973 | 30.26 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 86.23 | a | ----- | z | ----- | z | 39.94 | n | 38.65 | 51.71 | i | ||
| 1974 | 28.57 | a | 36.18 | 54.77 | 57.43 | 74.74 | 84.43 | 84.97 | 84.16 | 76.90 | 64.35 | 47.47 | 37.26 | 60.94 | ||||||||||||
| 1975 | 36.55 | 41.33 | a | 47.10 | a | 51.13 | 65.68 | 75.47 | 85.00 | b | 82.39 | 75.31 | a | 63.81 | 48.20 | 40.23 | 59.35 | |||||||||
| 1976 | 38.74 | 47.52 | 49.90 | 58.13 | 70.58 | 78.67 | 87.06 | 82.55 | 74.43 | 63.55 | 55.60 | 43.39 | 62.51 | |||||||||||||
| 1977 | 38.77 | 49.64 | 47.68 | 65.03 | 63.14 | j | 84.90 | a | 85.48 | 84.68 | 76.93 | 66.32 | 52.21 | a | 44.55 | 63.29 | a | |||||||||
| 1978 | 37.45 | 38.75 | 53.52 | 59.03 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.19 | h | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 36.97 | 41.98 | 50.15 | 59.38 | 68.79 | 77.67 | 83.45 | 81.44 | 74.52 | 63.41 | 49.91 | 40.21 | 60.77 | |||||||||||||
| S.D. | 4.68 | 5.58 | 4.50 | 4.29 | 4.58 | 4.23 | 3.76 | 3.24 | 3.67 | 4.69 | 5.00 | 4.66 | 2.26 | |||||||||||||
| SKEW | -0.87 | -0.39 | 0.76 | 0.18 | -0.47 | -0.57 | -1.01 | -0.65 | -0.77 | 0.08 | 0.11 | 0.25 | -0.10 | |||||||||||||
| MAX | 45.61 | 53.57 | 63.58 | 68.18 | 77.52 | 84.90 | 91.97 | 87.10 | 82.53 | 73.77 | 60.83 | 49.93 | 65.03 | |||||||||||||
| MIN | 21.13 | 28.54 | 40.29 | 51.13 | 55.74 | 65.10 | 71.73 | 71.97 | 64.00 | 50.79 | 41.03 | 30.71 | 54.96 | |||||||||||||
| YRS | 73 | 73 | 73 | 75 | 67 | 70 | 68 | 72 | 70 | 72 | 68 | 67 | 47 | |||||||||||||