| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1915 | 33.27 | a | 43.86 | 45.13 | 64.57 | 61.42 | 68.47 | 75.35 | 81.71 | 64.40 | 64.77 | 43.97 | a | 36.55 | 56.95 | |||||||||||
| 1916 | 15.52 | 39.14 | 50.52 | 56.87 | 58.29 | 72.23 | 84.68 | 79.13 | 72.73 | 50.74 | 37.53 | 25.23 | 53.55 | |||||||||||||
| 1917 | 28.55 | 32.39 | 36.03 | 47.90 | 57.42 | 74.10 | 86.03 | 79.45 | 71.90 | 56.19 | 52.47 | 34.71 | 54.76 | |||||||||||||
| 1918 | 26.10 | 32.79 | 52.55 | 43.27 | 60.81 | 80.97 | 80.06 | 79.74 | 67.57 | 63.61 | 38.30 | 38.45 | 55.35 | |||||||||||||
| 1919 | 43.03 | 35.79 | 48.94 | 60.93 | 71.90 | 84.80 | 88.77 | 87.10 | 74.00 | 46.81 | 37.33 | 30.23 | a | 59.14 | ||||||||||||
| 1920 | 38.39 | 38.14 | 42.55 | 46.93 | 62.97 | 74.13 | 84.97 | 82.52 | 74.57 | 57.19 | 40.47 | 35.52 | 56.53 | |||||||||||||
| 1921 | 39.94 | 45.79 | 48.61 | 53.57 | 63.87 | 80.63 | 86.97 | 84.23 | 67.80 | 65.87 | 42.83 | 32.26 | 59.36 | |||||||||||||
| 1922 | 25.81 | 28.18 | 45.71 | 52.20 | 63.94 | 80.77 | 81.71 | 86.71 | 79.00 | 62.58 | 38.87 | 29.68 | 56.26 | |||||||||||||
| 1923 | 37.48 | 31.18 | 42.03 | 54.27 | 66.94 | 75.10 | 87.42 | 78.55 | 70.70 | 48.71 | 46.77 | 33.81 | 56.08 | |||||||||||||
| 1924 | 28.68 | 42.21 | 34.97 | 53.30 | 65.32 | 72.13 | 82.84 | 83.68 | 71.30 | 56.87 | 44.63 | 23.68 | 54.97 | |||||||||||||
| 1925 | 36.26 | 44.89 | 48.97 | 58.53 | 67.45 | 74.23 | 86.45 | 82.87 | 69.47 | 43.61 | 44.70 | 40.39 | 58.15 | |||||||||||||
| 1926 | 36.55 | 44.71 | 47.42 | 59.37 | 65.97 | 75.40 | 85.45 | 81.29 | 63.77 | 61.58 | 48.03 | 37.13 | 58.89 | |||||||||||||
| 1927 | 34.23 | 40.96 | 47.26 | 53.77 | 59.03 | 72.80 | 82.13 | 75.13 | 69.00 | 66.06 | 47.07 | 27.58 | 56.25 | |||||||||||||
| 1928 | 40.13 | a | 39.10 | 51.03 | 55.47 | 71.68 | 67.97 | 80.03 | 79.94 | 73.27 | 57.97 | 47.13 | 35.97 | 58.31 | ||||||||||||
| 1929 | 26.52 | 29.14 | 45.97 | 52.77 | 63.26 | 75.43 | 85.87 | 87.13 | 64.10 | 62.81 | 39.43 | 41.03 | 56.12 | |||||||||||||
| 1930 | 20.84 | 46.14 | 43.94 | 66.20 | 65.39 | 77.00 | 87.00 | 80.35 | 72.43 | 53.10 | 49.57 | 42.84 | 58.73 | |||||||||||||
| 1931 | 44.45 | 47.32 | 46.77 | 56.27 | 65.26 | 80.50 | 86.68 | 83.84 | 73.67 | 63.19 | 44.43 | 40.03 | 61.03 | |||||||||||||
| 1932 | 32.13 | 41.48 | 39.03 | 57.90 | 67.58 | 74.90 | 85.87 | 84.84 | 73.40 | 55.81 | 52.17 | 30.00 | 57.93 | |||||||||||||
| 1933 | 37.74 | 31.79 | 54.77 | 57.33 | 66.48 | 86.53 | 93.71 | 83.23 | 77.70 | 70.68 | 57.00 | 50.29 | 63.94 | |||||||||||||
| 1934 | 51.39 | 50.00 | 59.03 | 66.73 | 82.19 | 79.50 | 89.94 | 86.29 | 70.90 | 71.68 | 57.83 | 45.03 | 67.54 | |||||||||||||
| 1935 | 48.24 | b | 52.18 | 50.65 | 56.70 | 63.03 | 78.93 | 93.16 | 86.26 | 79.57 | 65.71 | 45.87 | 45.90 | 63.85 | ||||||||||||
| 1936 | 39.13 | 20.24 | 50.35 | 59.93 | 80.90 | 83.07 | 91.97 | 87.32 | 78.00 | 64.13 | 52.97 | 41.90 | 62.49 | |||||||||||||
| 1937 | 20.55 | 40.50 | 47.90 | 60.60 | 74.00 | 77.03 | 88.32 | 91.23 | 79.63 | 67.94 | 48.97 | 40.52 | 61.43 | |||||||||||||
| 1938 | 39.61 | 42.32 | 49.65 | 59.17 | 65.65 | 76.73 | 81.65 | 82.23 | 79.30 | 62.03 | 38.80 | 39.87 | 59.75 | |||||||||||||
| 1939 | 40.97 | 30.93 | 49.26 | 60.97 | 71.48 | 71.07 | 86.81 | 83.26 | 76.50 | 62.13 | 56.50 | 45.29 | 61.26 | |||||||||||||
| 1940 | 28.71 | 40.34 | 52.52 | 55.60 | 71.81 | 82.30 | 86.35 | 86.19 | 78.40 | 64.81 | 39.47 | 41.23 | 60.64 | |||||||||||||
| 1941 | 41.06 | 43.82 | 46.84 | 53.23 | 70.13 | 76.03 | 83.13 | 80.71 | 66.90 | 59.35 | 50.07 | 39.55 | 59.24 | |||||||||||||
| 1942 | 33.65 | 33.29 | 46.58 | 62.73 | 61.61 | 72.13 | 85.74 | 82.03 | 65.10 | 58.16 | 43.60 | 40.55 | 57.10 | |||||||||||||
| 1943 | 30.45 | 43.36 | 38.97 | 63.57 | 60.58 | 71.10 | 86.29 | 85.42 | 73.93 | 64.16 | 51.10 | 42.52 | 59.29 | |||||||||||||
| 1944 | 39.68 | 40.28 | 42.35 | 57.37 | 68.55 | 68.30 | 80.42 | 80.61 | 72.07 | 68.48 | 47.13 | 41.35 | 58.88 | |||||||||||||
| 1945 | 41.71 | 41.93 | 49.45 | 52.57 | 63.26 | 66.70 | 83.45 | 81.19 | 67.67 | 66.74 | 47.67 | 37.32 | 58.30 | |||||||||||||
| 1946 | 41.97 | a | 44.21 | 53.58 | 66.27 | 61.65 | 75.17 | 85.58 | 79.71 | 70.83 | 52.48 | 46.43 | 44.13 | 60.17 | ||||||||||||
| 1947 | 38.74 | 38.57 | 45.00 | 56.53 | 67.58 | 69.27 | 86.35 | 83.68 | 72.97 | 66.10 | 39.53 | 40.65 | 58.75 | |||||||||||||
| 1948 | 38.87 | 35.79 | 42.74 | 59.67 | 69.94 | 74.27 | 81.45 | 83.65 | 74.23 | 64.45 | 44.90 | 34.94 | 58.74 | |||||||||||||
| 1949 | 24.10 | 37.71 | 46.26 | 67.07 | a | 69.19 | 74.07 | 84.62 | b | 84.58 | 72.10 | 52.16 | 59.10 | 39.43 | a | 59.20 | ||||||||||
| 1950 | 30.40 | a | 47.95 | i | 47.10 | 57.87 | 63.65 | 74.83 | 81.42 | 83.07 | a | 69.46 | b | 66.65 | 46.60 | 47.07 | b | 60.74 | ||||||||
| 1951 | 35.45 | 45.11 | 43.61 | 57.30 | 68.94 | 70.33 | 85.48 | 79.23 | 70.43 | 58.19 | 47.77 | 34.94 | 58.06 | |||||||||||||
| 1952 | 38.84 | 44.28 | 44.81 | 64.70 | 68.65 | 78.53 | 83.06 | 83.55 | 79.07 | a | 69.23 | 43.20 | 42.06 | 61.66 | ||||||||||||
| 1953 | 49.61 | 41.71 | 53.64 | c | 51.97 | 61.74 | 76.13 | 87.26 | 83.67 | d | 77.87 | 67.42 | 54.20 | 40.68 | 62.16 | |||||||||||
| 1954 | 37.84 | 54.18 | 42.19 | 58.00 | 67.26 | 74.00 | 89.13 | 84.03 | b | 76.40 | 62.97 | 57.53 | 44.48 | 62.33 | ||||||||||||
| 1955 | 40.26 | 38.35 | e | 40.10 | 58.10 | 66.70 | a | 73.10 | 85.13 | 86.81 | 71.53 | 64.93 | b | 34.62 | a | 34.57 | a | 57.85 | ||||||||
| 1956 | 39.87 | h | 35.85 | c | 45.29 | 51.73 | 67.23 | 82.70 | 82.26 | 78.77 | 74.80 | 63.00 | 44.57 | 42.29 | 60.77 | |||||||||||
| 1957 | 25.77 | 39.93 | 47.16 | 49.63 | 63.84 | 71.23 | 86.71 | 82.35 | 69.53 | 55.97 | 40.37 | 44.52 | 56.42 | |||||||||||||
| 1958 | 43.87 | 39.68 | 41.26 | 52.07 | 73.77 | 70.63 | 75.81 | 85.03 | 72.20 | 64.90 | 46.37 | 40.35 | 58.83 | |||||||||||||
| 1959 | 37.03 | 35.04 | 47.35 | 54.50 | 60.13 | 79.53 | 85.45 | 84.52 | 69.00 | 56.03 | 41.50 | 42.35 | 57.70 | |||||||||||||
| 1960 | 36.29 | 32.45 | 46.71 | 55.10 | 67.45 | 77.80 | 88.35 | 81.10 | 73.90 | 60.06 | 44.70 | 40.06 | 58.67 | |||||||||||||
| 1961 | 43.74 | 45.04 | 49.29 | 51.80 | 65.68 | 83.00 | 84.52 | 86.42 | 61.07 | 57.10 | 42.53 | 35.29 | 58.79 | |||||||||||||
| 1962 | 29.81 | 36.64 | 43.55 | 61.37 | 64.81 | 74.77 | 79.45 | 80.48 | 70.67 | ----- | z | 43.23 | q | 44.16 | 58.57 | |||||||||||
| 1963 | 27.48 | 46.96 | 50.10 | 54.10 | 66.97 | 74.40 | 85.81 | 84.74 | 78.07 | 68.16 | 51.60 | 34.68 | 60.26 | |||||||||||||
| 1964 | 37.42 | 39.21 | 42.29 | 56.23 | 66.23 | 72.00 | 88.61 | 81.48 | 73.00 | 65.61 | 45.00 | 35.00 | 58.51 | |||||||||||||
| 1965 | 42.81 | 40.36 | 34.68 | 57.03 | 62.32 | 73.80 | 84.35 | 80.55 | 58.30 | 69.16 | 52.60 | 43.03 | 58.25 | |||||||||||||
| 1966 | 36.13 | 40.75 | 51.84 | 53.37 | 73.58 | 75.53 | 90.26 | 81.68 | 76.53 | 62.58 | 47.23 | 40.39 | 60.82 | |||||||||||||
| 1967 | 41.13 | 43.71 | 46.19 | 53.97 | 63.13 | 69.10 | 84.65 | 85.84 | 76.93 | 63.87 | 47.13 | 33.87 | 59.13 | |||||||||||||
| 1968 | 35.39 | 44.66 | 53.35 | 54.40 | 64.03 | 73.70 | 85.97 | 77.58 | 74.29 | m | ----- | z | ----- | z | ----- | z | 61.13 | |||||||||
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1970 | 37.81 | 50.29 | 43.52 | 49.10 | 69.45 | 80.50 | 88.87 | 90.68 | 68.27 | 57.27 | a | 45.47 | 38.26 | 59.96 | ||||||||||||
| 1971 | 34.10 | 38.50 | 45.61 | 56.30 | 66.74 | 79.40 | 84.00 | 90.16 | 70.90 | 54.77 | 46.70 | 35.26 | 58.54 | |||||||||||||
| 1972 | 31.26 | 42.52 | 56.39 | 58.43 | 66.16 | 78.93 | 82.87 | 82.32 | 69.83 | 58.65 | 43.27 | 28.52 | 58.26 | |||||||||||||
| 1973 | 32.77 | 40.86 | 46.42 | 50.20 | 66.90 | 78.40 | 82.90 | 84.94 | 68.87 | 64.68 | 43.47 | 42.03 | 58.54 | |||||||||||||
| 1974 | 32.77 | 45.07 | 48.03 | 58.77 | 64.87 | 82.17 | 88.03 | 79.03 | 72.50 | 65.45 | 47.43 | 37.81 | 60.16 | |||||||||||||
| 1975 | 33.19 | 34.29 | 43.32 | 47.83 | 61.03 | 72.80 | 86.39 | 81.00 | 73.80 | 59.58 | 44.07 | 41.23 | 56.54 | |||||||||||||
| 1976 | 36.55 | 42.34 | 43.55 | 56.90 | 70.58 | 73.27 | 87.06 | 81.48 | 73.57 | 60.68 | 48.63 | 45.19 | 59.98 | |||||||||||||
| 1977 | 31.52 | 46.36 | 46.68 | 64.03 | 67.10 | 79.63 | 86.35 | 76.32 | 72.87 | 62.87 | 46.03 | 38.26 | 59.84 | |||||||||||||
| 1978 | 29.81 | 33.96 | 50.94 | 56.93 | 63.10 | 77.30 | 82.87 | 81.06 | 73.73 | 64.35 | 37.70 | 24.77 | 56.38 | |||||||||||||
| 1979 | 16.90 | 36.07 | 47.87 | 57.17 | 67.06 | 79.27 | 85.23 | 79.94 | 80.60 | 63.65 | 41.43 | 44.63 | a | 58.32 | ||||||||||||
| 1980 | 30.71 | 39.97 | 43.77 | 60.97 | 66.16 | 76.47 | 85.84 | 76.52 | 72.97 | 60.29 | 48.10 | 48.16 | 59.16 | |||||||||||||
| 1981 | 44.90 | 41.18 | 51.48 | 59.60 | 62.19 | 74.33 | 82.58 | 84.45 | 76.30 | 55.13 | 52.27 | 38.61 | 60.25 | |||||||||||||
| 1982 | 29.74 | 37.14 | 45.48 | ----- | z | 62.35 | 68.80 | 81.29 | 86.45 | 67.50 | 58.35 | 41.80 | 36.06 | 55.91 | ||||||||||||
| 1983 | 43.61 | 47.29 | 47.06 | 49.80 | 58.10 | 73.80 | 86.39 | 87.65 | 71.97 | 62.84 | 48.13 | 19.19 | 57.99 | |||||||||||||
| 1984 | 35.03 | 42.90 | 49.23 | 56.53 | 67.35 | 73.70 | 83.87 | 83.68 | 66.53 | 57.41 | b | 47.50 | 32.65 | 58.03 | ||||||||||||
| 1985 | 30.74 | 36.89 | 47.26 | 60.80 | 71.39 | 79.77 | 87.32 | 83.13 | 67.17 | 60.48 | 28.93 | 33.71 | 57.30 | |||||||||||||
| 1986 | 43.06 | 37.12 | b | 57.10 | 58.70 | 67.39 | 81.80 | 80.16 | 81.19 | 60.97 | ----- | z | ----- | z | ----- | z | 63.05 | |||||||||
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 78.83 | a | 78.19 | 76.29 | 73.57 | 62.23 | 48.50 | 36.45 | 64.87 | |||||||
| 1988 | 34.52 | 42.38 | 46.84 | 61.67 | 69.87 | 85.03 | 86.35 | 81.90 | 69.43 | 65.81 | 43.83 | 39.19 | 60.57 | |||||||||||||
| 1989 | 38.32 | 21.61 | 45.65 | 57.67 | 65.35 | 75.10 | 85.71 | 79.19 | 72.23 | 58.81 | 48.43 | 37.42 | 57.12 | |||||||||||||
| 1990 | 40.52 | 41.79 | 48.84 | 57.83 | 63.77 | 76.63 | 82.81 | 81.74 | 77.33 | 59.65 | 50.43 | 29.26 | 59.22 | |||||||||||||
| 1991 | 33.68 | 50.18 | 48.45 | 50.00 | 62.71 | 73.40 | 83.74 | 83.68 | 70.40 | 57.06 | 40.70 | 41.61 | 57.97 | |||||||||||||
| 1992 | 42.58 | 49.28 | 54.87 | 61.37 | 70.03 | 73.10 | 75.16 | 78.87 | 73.13 | 60.81 | 40.60 | 29.61 | 59.12 | |||||||||||||
| 1993 | 32.45 | 31.57 | 51.55 | 54.63 | 68.13 | 69.63 | 73.52 | 76.26 | 70.47 | 59.23 | 39.97 | 41.32 | 55.73 | |||||||||||||
| 1994 | 43.06 | 36.75 | 52.00 | 58.47 | 71.13 | 78.47 | 82.55 | 84.19 | 76.03 | 57.03 | 41.70 | 40.23 | 60.13 | |||||||||||||
| 1995 | 38.06 | 42.82 | 46.58 | 53.50 | 59.97 | 71.70 | 82.10 | 86.00 | 70.37 | 57.10 | 48.00 | 40.94 | 58.09 | |||||||||||||
| 1996 | 32.10 | 39.72 | 40.84 | 58.37 | 59.74 | 79.30 | 83.81 | 84.74 | 69.17 | 58.65 | 42.83 | 34.39 | 56.97 | |||||||||||||
| 1997 | 31.97 | 39.25 | 52.00 | 50.63 | 68.23 | 76.37 | 80.23 | 80.10 | 74.83 | 59.16 | 44.43 | 37.42 | 57.88 | |||||||||||||
| 1998 | 36.13 | 42.75 | 45.52 | 57.33 | 69.16 | 65.83 | 86.10 | 83.23 | 78.20 | 60.71 | 46.43 | 36.16 | 58.96 | |||||||||||||
| 1999 | 39.52 | 45.86 | 53.87 | 53.17 | 64.06 | 74.40 | 85.55 | 83.81 | 68.97 | 65.77 | 58.20 | 43.35 | 61.38 | |||||||||||||
| 2000 | 38.32 | 46.62 | 52.23 | 62.63 | 66.52 | 76.20 | 86.74 | 84.58 | 72.60 | 58.97 | 35.60 | 34.13 | 59.59 | |||||||||||||
| 2001 | 39.77 | 34.61 | 50.13 | 58.60 | 72.13 | 76.70 | 85.00 | 86.48 | 76.67 | 61.00 | 52.50 | 37.52 | 60.93 | |||||||||||||
| 2002 | 35.90 | 41.11 | 40.84 | 55.23 | 66.26 | 78.17 | 87.48 | 78.74 | 72.20 | 51.00 | 46.27 | 39.10 | 57.69 | |||||||||||||
| 2003 | 45.74 | 35.86 | 47.84 | 61.17 | 66.52 | 73.77 | 88.45 | 85.13 | 71.87 | 66.61 | 39.30 | 39.97 | 60.18 | |||||||||||||
| 2004 | 39.94 | 42.93 | 55.06 | 62.00 | 64.68 | 71.80 | 82.39 | 77.81 | 72.20 | 60.03 | 49.87 | 43.61 | 60.19 | |||||||||||||
| 2005 | 40.06 | 44.14 | f | 50.68 | 57.30 | 63.94 | 75.00 | 88.45 | 80.81 | 74.50 | 61.42 | 47.97 | 36.19 | 61.48 | ||||||||||||
| 2006 | 45.26 | 40.04 | 48.74 | 62.73 | 70.23 | 79.90 | 88.77 | 82.65 | 70.37 | 57.32 | 47.27 | 39.52 | 61.07 | |||||||||||||
| 2007 | 33.45 | 39.75 | 57.35 | 57.20 | 71.39 | 80.23 | 89.65 | 84.42 | 75.53 | 59.52 | 48.57 | 34.19 | 60.94 | |||||||||||||
| 2008 | 33.71 | 42.83 | 45.87 | 56.07 | 64.94 | 77.03 | 87.55 | 86.26 | 71.77 | 60.06 | 50.67 | 29.68 | 58.87 | |||||||||||||
| 2009 | 37.55 | 40.04 | 46.35 | 55.40 | 69.03 | 70.33 | 81.17 | h | 80.22 | m | 79.30 | 48.94 | 50.63 | 27.53 | l | 55.29 | ||||||||||
| 2010 | ----- | z | 43.40 | w | 51.84 | 55.57 | 57.77 | 73.77 | 84.42 | 83.39 | 73.80 | 64.32 | 39.63 | 37.35 | 62.19 | |||||||||||
| 2011 | 36.58 | 31.04 | 47.77 | 49.93 | 57.23 | 73.80 | 89.29 | 86.50 | a | 75.77 | 60.16 | 42.70 | 35.94 | 57.23 | ||||||||||||
| 2012 | 41.61 | 36.17 | 57.39 | 61.90 | 66.23 | 82.00 | 90.58 | 85.77 | 76.67 | 56.16 | 49.10 | 35.65 | 61.60 | |||||||||||||
| 2013 | 36.45 | 39.43 | 49.19 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 41.69 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 35.95 | 40.02 | 47.59 | 56.80 | 66.14 | 75.73 | 84.97 | 82.80 | 72.33 | 60.73 | 45.91 | 37.87 | 58.95 | |||||||||||||
| S.D. | 6.65 | 5.94 | 4.79 | 4.67 | 4.49 | 4.31 | 3.65 | 3.24 | 4.38 | 5.30 | 5.53 | 5.58 | 2.17 | |||||||||||||
| SKEW | -0.57 | -0.57 | -0.16 | -0.12 | 0.61 | 0.12 | -0.59 | -0.01 | -0.56 | -0.62 | 0.02 | -0.70 | 0.64 | |||||||||||||
| MAX | 51.39 | 54.18 | 59.03 | 67.07 | 82.19 | 86.53 | 93.71 | 91.23 | 80.60 | 71.68 | 59.10 | 50.29 | 67.54 | |||||||||||||
| MIN | 15.52 | 20.24 | 34.68 | 43.27 | 57.23 | 65.83 | 73.52 | 75.13 | 58.30 | 43.61 | 28.93 | 19.19 | 53.55 | |||||||||||||
| NO YRS | 95 | 94 | 97 | 95 | 96 | 97 | 96 | 96 | 96 | 94 | 94 | 94 | 87 | |||||||||||||