| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1917 | ----- | z | ----- | z | 45.48 | 54.77 | 62.42 | 73.47 | 88.16 | 85.93 | d | 77.80 | 64.13 | 55.90 | 49.53 | a | 65.76 | |||||||||
| 1918 | 41.17 | a | 41.89 | 54.35 | 59.80 | 64.32 | 83.93 | 83.52 | 76.65 | 76.00 | 63.13 | 46.96 | g | 38.42 | 62.11 | |||||||||||
| 1919 | 42.94 | 38.79 | 50.39 | 61.20 | 67.61 | 77.07 | 88.74 | 87.87 | 75.23 | 53.68 | 45.27 | 30.71 | 59.96 | |||||||||||||
| 1920 | 40.06 | 45.61 | a | 46.42 | 52.67 | 63.65 | 72.23 | 86.48 | 84.16 | 70.87 | 55.71 | 46.73 | 39.71 | 58.69 | ||||||||||||
| 1921 | 38.84 | 41.11 | 51.81 | 54.00 | 64.90 | 76.23 | 85.06 | 85.16 | 66.70 | 64.84 | 49.60 | 38.94 | 59.77 | |||||||||||||
| 1922 | 28.81 | e | 36.57 | 42.81 | 52.23 | 64.35 | 79.77 | 86.06 | 84.58 | 80.40 | 65.19 | 45.20 | 35.65 | 58.47 | ||||||||||||
| 1923 | 41.90 | 38.61 | 48.48 | 57.73 | 63.23 | 68.20 | 82.97 | 83.39 | 77.53 | 57.45 | 49.30 | 39.32 | 59.01 | |||||||||||||
| 1924 | 33.58 | 46.10 | 43.06 | 58.00 | 75.23 | 74.70 | 84.84 | 81.23 | a | 76.93 | 61.68 | 46.50 | 30.39 | 59.35 | ||||||||||||
| 1925 | 40.58 | 47.64 | 50.74 | 59.17 | 69.19 | 74.00 | 86.48 | f | 79.68 | 67.60 | 57.00 | 45.67 | 37.83 | b | 57.19 | |||||||||||
| 1926 | 33.74 | 46.36 | 54.90 | 65.47 | 66.06 | 80.93 | a | 88.06 | 82.48 | 64.87 | 61.35 | 50.77 | 37.87 | a | 61.07 | |||||||||||
| 1927 | 36.73 | a | 43.00 | 47.71 | 55.20 | 59.06 | 72.60 | 82.94 | 81.58 | 64.13 | 59.61 | 48.20 | 32.45 | 56.94 | ||||||||||||
| 1928 | 36.13 | 38.72 | 50.48 | 53.60 | 73.00 | 71.40 | 84.32 | 82.00 | 74.23 | 60.32 | 46.60 | 35.80 | a | 58.88 | ||||||||||||
| 1929 | 28.55 | 32.07 | a | 47.94 | 53.13 | 66.61 | 71.53 | 83.87 | 87.32 | 68.90 | 64.68 | 47.53 | 46.48 | 58.22 | ||||||||||||
| 1930 | 24.35 | 46.18 | 50.13 | 63.50 | 63.94 | 72.87 | 84.13 | 85.58 | 74.77 | h | 57.03 | 46.60 | 33.42 | 57.07 | ||||||||||||
| 1931 | 38.45 | 42.50 | 49.77 | 60.03 | 71.87 | 74.07 | 86.61 | 85.65 | 71.10 | 61.55 | 41.73 | 36.06 | 59.95 | |||||||||||||
| 1932 | 34.03 | 34.59 | 45.32 | 58.73 | 65.52 | 78.17 | 81.13 | 80.68 | 75.87 | 60.00 | 51.13 | 31.58 | 58.06 | |||||||||||||
| 1933 | 36.06 | 31.32 | 47.48 | 57.37 | 60.13 | 75.53 | 85.29 | 81.87 | 69.40 | 67.20 | a | 51.57 | 47.45 | 59.22 | ||||||||||||
| 1934 | 45.13 | 50.43 | 57.74 | 63.63 | 70.10 | 72.33 | 83.55 | 85.26 | 70.93 | 63.45 | 52.93 | 37.81 | 62.77 | |||||||||||||
| 1935 | 40.20 | a | 42.71 | 44.61 | 55.03 | 65.06 | 74.87 | 81.97 | 82.00 | 78.67 | 60.31 | b | 42.30 | 39.94 | 58.97 | |||||||||||
| 1936 | 36.45 | 31.21 | 47.77 | a | 61.73 | 72.81 | 74.93 | 84.87 | 83.65 | 72.17 | a | 66.32 | 48.07 | a | 40.48 | 60.04 | ||||||||||
| 1937 | 21.13 | 37.25 | 49.87 | 53.17 | 67.52 | 72.07 | 83.39 | 80.19 | 74.90 | 63.19 | 50.77 | 43.63 | a | 58.09 | ||||||||||||
| 1938 | 42.00 | 43.29 | 46.68 | 58.67 | 65.32 | 75.20 | 83.77 | 80.39 | 79.23 | 61.45 | 41.40 | 41.58 | 59.91 | |||||||||||||
| 1939 | 40.71 | 35.86 | 51.06 | 62.87 | 69.77 | 69.90 | 84.23 | 85.71 | 74.67 | 59.42 | 54.07 | 45.23 | 61.12 | |||||||||||||
| 1940 | 39.87 | 46.03 | 52.61 | 57.33 | 71.26 | 79.43 | 82.90 | 84.77 | 70.87 | 60.61 | 40.87 | 43.45 | 60.83 | |||||||||||||
| 1941 | 42.28 | b | 45.75 | 55.90 | 59.33 | 64.00 | 69.93 | 82.65 | 78.26 | 62.77 | 56.42 | 50.30 | 41.55 | 59.09 | ||||||||||||
| 1942 | 33.97 | 38.50 | 47.42 | 60.13 | 60.52 | 69.30 | 83.06 | 83.13 | 74.27 | 64.06 | 47.97 | 39.61 | 58.50 | |||||||||||||
| 1943 | 33.42 | 44.18 | 46.97 | 61.80 | 60.61 | 65.46 | b | 81.58 | 79.81 | 78.17 | 61.52 | 49.60 | 39.74 | 58.57 | ||||||||||||
| 1944 | 38.52 | 39.72 | 47.23 | 57.17 | 66.87 | 69.47 | 81.77 | 80.68 | 75.03 | 68.03 | 44.37 | 37.39 | 58.85 | |||||||||||||
| 1945 | 38.42 | 43.21 | 45.68 | 54.10 | 64.58 | 70.37 | 85.55 | 82.71 | 69.53 | 64.71 | 45.37 | 38.45 | 58.56 | |||||||||||||
| 1946 | 39.10 | 40.21 | 48.74 | 60.37 | 66.97 | 71.50 | 80.74 | 82.19 | 69.47 | 53.13 | 43.33 | 42.61 | 58.20 | |||||||||||||
| 1947 | 32.42 | 48.25 | 54.52 | 57.80 | 71.65 | 67.90 | 81.68 | 80.00 | 73.43 | 61.42 | 42.93 | 40.23 | 59.35 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 77.39 | 76.90 | 72.40 | 65.35 | 44.93 | 33.19 | 61.70 | |||||||
| 1949 | 21.16 | 39.75 | 50.84 | 64.77 | 71.35 | 76.63 | 85.65 | 88.23 | 78.23 | 56.97 | 55.90 | 39.65 | 60.76 | |||||||||||||
| 1950 | 29.97 | a | 43.75 | 46.35 | 54.90 | a | 65.13 | 72.13 | 83.29 | 85.90 | 73.27 | 62.67 | g | 48.97 | 46.52 | 59.11 | ||||||||||
| 1951 | 35.87 | a | 44.33 | a | 45.00 | a | 63.27 | 67.83 | b | 73.45 | a | 87.39 | c | 72.42 | s | 78.73 | d | 59.03 | b | 46.82 | b | 33.78 | d | 57.77 | ||
| 1952 | 34.62 | b | 39.24 | 43.23 | 64.52 | a | 66.71 | 72.87 | 84.96 | c | 84.38 | e | 81.14 | b | 71.33 | d | 46.20 | e | 41.00 | a | 60.85 | |||||
| 1953 | 49.63 | d | 43.19 | a | 51.45 | 57.03 | 62.32 | 68.56 | e | 84.87 | a | 80.28 | f | 80.72 | a | 66.42 | g | 53.30 | 39.57 | a | 59.06 | |||||
| 1954 | 38.42 | 47.14 | 49.29 | 56.67 | 67.39 | 69.11 | b | 82.87 | 78.26 | 74.79 | a | 62.32 | 53.30 | 38.26 | 59.82 | |||||||||||
| 1955 | 34.29 | 37.11 | 41.70 | a | 50.26 | c | 62.65 | e | 76.66 | a | 83.17 | a | 88.39 | 77.07 | b | 64.35 | h | 42.17 | 39.93 | b | 57.58 | |||||
| 1956 | 38.74 | 35.07 | 47.29 | 61.78 | c | 68.26 | 71.59 | a | 85.90 | 81.90 | 78.20 | 60.73 | a | 46.17 | 41.30 | d | 59.74 | |||||||||
| 1957 | 26.77 | 41.54 | 52.00 | i | 60.41 | c | 67.26 | 76.15 | d | 83.75 | g | 82.10 | 79.48 | a | 60.33 | a | 41.75 | f | 41.41 | b | 59.50 | |||||
| 1958 | 41.65 | 50.32 | 48.03 | 55.40 | 75.45 | 77.10 | a | 87.94 | 89.19 | j | 73.43 | 69.81 | 49.27 | 44.58 | 61.18 | |||||||||||
| 1959 | 36.67 | j | 39.47 | i | 51.70 | h | 63.86 | b | 64.35 | 78.90 | 86.77 | a | 82.50 | g | 68.20 | 62.48 | b | 47.33 | 43.10 | 64.37 | ||||||
| 1960 | 35.43 | a | 40.26 | b | 52.42 | 58.97 | 61.23 | 75.88 | d | 91.52 | 79.10 | a | 77.87 | 63.23 | 47.63 | 41.39 | 60.41 | |||||||||
| 1961 | 43.50 | a | 47.50 | 49.20 | a | 55.67 | 64.93 | d | 81.40 | 88.90 | 91.19 | 70.61 | b | 60.84 | 46.30 | 38.42 | 61.54 | |||||||||
| 1962 | 33.52 | 40.18 | 48.26 | 63.40 | 60.06 | 75.27 | 82.35 | 82.00 | c | 76.50 | 60.00 | 48.18 | b | 43.94 | 59.47 | |||||||||||
| 1963 | 33.35 | 53.54 | 51.36 | c | 54.50 | 67.77 | 71.73 | 79.16 | 83.71 | 80.63 | 64.06 | 49.62 | a | 37.10 | 60.55 | |||||||||||
| 1964 | 37.58 | 39.86 | 45.39 | 55.80 | 64.97 | a | 70.53 | 83.52 | b | 78.55 | 71.37 | 66.48 | 46.97 | 37.48 | b | 58.21 | ||||||||||
| 1965 | 39.07 | a | 44.46 | 47.87 | 58.80 | 64.67 | a | 72.13 | 82.65 | 78.97 | 68.08 | f | 69.39 | 50.73 | 41.59 | d | 59.12 | |||||||||
| 1966 | 41.16 | 41.71 | 52.06 | 59.27 | 72.09 | i | 71.67 | 82.77 | 83.93 | a | 78.53 | 61.55 | 48.73 | 40.45 | 60.17 | |||||||||||
| 1967 | 42.81 | 46.86 | 48.29 | 51.25 | b | 66.00 | 73.47 | 85.97 | 90.87 | 82.73 | 62.81 | 48.50 | 36.81 | 61.36 | ||||||||||||
| 1968 | 39.79 | b | 46.97 | 54.55 | 55.27 | 64.38 | b | 72.30 | 86.06 | 75.77 | a | 71.82 | b | 60.16 | 45.72 | a | 39.16 | 59.33 | ||||||||
| 1969 | 35.90 | 41.79 | 50.74 | 59.66 | a | 70.30 | a | 74.67 | 81.42 | 83.23 | 73.90 | 56.74 | 51.00 | 43.30 | a | 60.22 | ||||||||||
| 1970 | 41.39 | 49.86 | 47.77 | 50.97 | 65.97 | 77.03 | 84.90 | 87.94 | 67.13 | 57.77 | 48.40 | 36.48 | 59.63 | |||||||||||||
| 1971 | 39.81 | 43.79 | 45.39 | 57.20 | 67.10 | 70.00 | 84.03 | 89.81 | 68.10 | 58.03 | 46.60 | 34.13 | 58.66 | |||||||||||||
| 1972 | 34.03 | 42.31 | 54.81 | 55.07 | 70.35 | 73.33 | 82.73 | a | 85.19 | 67.33 | 60.03 | 45.97 | 30.90 | b | 58.50 | |||||||||||
| 1973 | 36.77 | 46.57 | 51.19 | 56.13 | 68.73 | a | 75.17 | 87.39 | 86.13 | 73.00 | 58.22 | v | ----- | z | ----- | z | 64.57 | |||||||||
| 1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 84.55 | 75.37 | 71.32 | 46.27 | 36.32 | 62.77 | ||||||
| 1989 | 34.94 | 32.14 | 49.00 | a | 60.53 | 64.81 | 76.13 | 85.00 | 77.07 | a | 74.10 | 59.94 | 49.23 | 44.61 | 58.96 | |||||||||||
| 1990 | 41.03 | 42.07 | 53.65 | 62.33 | 62.45 | 72.17 | 85.45 | 82.58 | 83.00 | 59.65 | 49.27 | 29.65 | 60.27 | |||||||||||||
| 1991 | 36.81 | 51.64 | 48.55 | 55.83 | 59.35 | 67.40 | 83.87 | 87.06 | 79.23 | 62.74 | 45.07 | 43.39 | 60.08 | |||||||||||||
| 1992 | 43.87 | 51.76 | 58.45 | ----- | z | 73.71 | 78.10 | ----- | z | 84.74 | 73.27 | 64.48 | 42.07 | 35.58 | 60.60 | |||||||||||
| 1993 | 31.90 | 36.64 | 48.90 | 54.60 | 70.35 | 68.73 | 70.16 | 77.90 | 76.20 | 62.81 | 42.90 | 41.45 | 56.88 | |||||||||||||
| 1994 | 43.90 | 42.21 | 56.42 | 59.37 | 68.35 | 67.17 | a | 86.61 | 87.00 | 78.80 | 60.00 | 39.76 | a | 40.19 | 60.82 | |||||||||||
| 1995 | 42.87 | 49.36 | 50.70 | a | 55.30 | 65.30 | a | 69.77 | 80.39 | 80.29 | ----- | z | 57.26 | 50.93 | 41.03 | 58.47 | ||||||||||
| 1996 | 39.70 | a | 43.86 | 51.61 | 58.67 | 60.48 | 75.53 | 86.35 | 84.23 | 71.27 | 61.26 | 48.37 | 42.26 | 60.30 | ||||||||||||
| 1997 | 40.19 | 43.61 | 51.29 | 57.03 | 72.16 | 74.21 | a | 82.61 | 87.55 | 78.93 | ----- | z | 51.00 | 39.97 | 61.69 | |||||||||||
| 1998 | 45.00 | 46.68 | 52.13 | 58.70 | 62.61 | 73.77 | ----- | z | 90.23 | a | ----- | z | 61.45 | ----- | z | 36.32 | 58.54 | |||||||||
| 1999 | 42.67 | a | 44.29 | ----- | z | 57.79 | a | 66.00 | 75.30 | 86.55 | 88.97 | ----- | z | 71.68 | 57.63 | 38.58 | 62.95 | |||||||||
| 2000 | 40.32 | 47.14 | 51.13 | 65.77 | ----- | z | ----- | z | ----- | z | ----- | z | 71.53 | ----- | z | 40.10 | 38.10 | 50.58 | ||||||||
| 2001 | 36.35 | 40.43 | 52.87 | 54.27 | 69.55 | 70.87 | 82.33 | g | 86.61 | m | ----- | z | 63.16 | ----- | z | ----- | z | 55.36 | ||||||||
| 2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 86.48 | ----- | z | ----- | z | ----- | z | ----- | z | 86.48 | ||
| 2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 52.00 | e | 37.03 | 44.52 | ||
| 2009 | ----- | z | 43.12 | k | 46.00 | k | 56.00 | q | 58.29 | q | ----- | z | 85.00 | z | ----- | z | 88.00 | z | 48.67 | z | ----- | z | 25.00 | z | 9999.00 | |
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 39.96 | h | 9999.00 | |
| 2011 | 35.30 | d | 39.16 | c | 46.45 | b | 51.04 | d | 60.43 | c | 69.22 | c | 81.33 | g | 87.86 | j | 83.12 | f | 60.80 | k | 44.75 | n | 39.60 | k | 50.27 | |
| 2012 | 42.50 | e | 43.65 | f | 48.85 | d | 59.79 | a | 62.96 | h | 72.24 | m | 87.57 | c | 89.11 | d | 80.85 | j | 59.47 | p | 52.33 | u | 32.44 | v | 65.57 | |
| 2013 | 27.38 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 37.42 | 42.58 | 49.51 | 57.94 | 66.31 | 73.41 | 84.19 | 83.50 | 74.13 | 61.90 | 47.70 | 39.16 | 59.52 | |||||||||||||
| S.D. | 5.41 | 5.03 | 3.59 | 3.79 | 3.94 | 3.68 | 3.04 | 3.72 | 4.68 | 4.00 | 3.84 | 4.17 | 1.19 | |||||||||||||
| SKEW | -0.90 | -0.23 | 0.25 | 0.10 | 0.27 | 0.36 | -1.36 | 0.02 | -0.30 | 0.43 | 0.16 | -0.14 | 0.17 | |||||||||||||
| MAX | 49.63 | 53.54 | 58.45 | 65.77 | 75.45 | 83.93 | 91.52 | 91.19 | 83.00 | 71.68 | 57.63 | 49.53 | 62.77 | |||||||||||||
| MIN | 21.13 | 31.21 | 41.70 | 50.26 | 59.06 | 65.46 | 70.16 | 75.77 | 62.77 | 53.13 | 39.76 | 29.65 | 56.88 | |||||||||||||
| NO YRS | 69 | 68 | 68 | 70 | 68 | 69 | 65 | 67 | 65 | 65 | 67 | 70 | 48 | |||||||||||||