| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1917 | 53.58 | s | 58.82 | 64.42 | 72.97 | 77.10 | 93.37 | 96.26 | 95.16 | 88.53 | 82.77 | 77.23 | 70.71 | 79.76 | ||||||||||||
| 1918 | 65.16 | 63.04 | 69.42 | 78.93 | 85.81 | 99.23 | 95.61 | 93.77 | 90.83 | 79.23 | 63.40 | 56.45 | 78.41 | |||||||||||||
| 1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.00 | 60.61 | 61.81 | |||
| 1939 | 57.42 | 54.75 | ----- | z | 80.33 | 85.77 | 93.37 | 101.32 | 102.65 | 90.43 | 79.55 | 72.57 | 64.32 | 80.23 | ||||||||||||
| 1940 | 60.71 | 62.07 | 72.58 | 76.67 | 89.97 | 98.97 | 98.94 | 100.87 | 89.30 | 81.84 | 65.53 | 61.71 | 79.93 | |||||||||||||
| 1941 | 57.90 | 63.36 | 66.77 | 70.40 | 83.48 | 88.27 | 98.48 | 93.06 | 87.47 | 74.03 | 67.76 | a | 58.16 | 75.76 | ||||||||||||
| 1942 | 60.23 | 60.50 | 67.55 | 72.53 | 82.74 | 93.57 | 101.35 | 97.23 | 89.55 | a | 79.29 | 71.10 | 65.52 | 78.43 | ||||||||||||
| 1943 | 62.48 | 63.93 | 71.58 | 79.90 | 87.16 | 88.40 | 97.55 | 97.32 | 94.93 | 80.90 | 68.43 | 55.26 | 78.99 | |||||||||||||
| 1944 | 55.16 | 54.93 | 64.94 | 70.27 | 80.81 | 83.70 | 95.42 | 98.16 | 92.43 | 80.48 | 61.07 | 59.29 | 74.72 | |||||||||||||
| 1945 | 58.61 | 60.21 | 60.48 | 74.73 | 80.13 | 90.87 | 101.13 | 94.29 | 90.23 | 77.06 | 63.93 | 56.87 | 75.71 | |||||||||||||
| 1946 | 58.61 | 60.43 | 65.39 | 79.13 | 81.03 | 92.60 | 96.32 | 97.19 | 90.27 | 72.03 | 59.17 | 59.48 | 75.97 | |||||||||||||
| 1947 | 57.68 | 66.89 | 69.10 | 74.90 | 86.58 | 87.93 | 98.48 | 93.74 | 93.43 | 76.87 | 60.70 | 54.13 | 76.70 | |||||||||||||
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 97.03 | 97.03 | 92.00 | 77.97 | 64.53 | 55.42 | 80.66 | |||||||
| 1949 | 44.10 | 57.46 | 65.16 | 79.21 | a | 81.76 | b | 93.40 | 98.35 | 95.68 | 94.07 | 78.84 | 75.77 | 58.63 | a | 76.87 | ||||||||||
| 1950 | 57.35 | 67.64 | 71.52 | 80.70 | 83.65 | 90.53 | 98.45 | 98.71 | 88.53 | 84.39 | 72.67 | 68.32 | 80.21 | |||||||||||||
| 1951 | 58.61 | 61.04 | 67.58 | 73.03 | 81.77 | 90.50 | 98.97 | 97.06 | 95.73 | 78.45 | 65.23 | 54.87 | 76.90 | |||||||||||||
| 1952 | 51.29 | 61.00 | 57.26 | 72.43 | 86.23 | 85.80 | 97.84 | 98.74 | 91.23 | 87.35 | 62.43 | 54.94 | 75.55 | |||||||||||||
| 1953 | 63.53 | a | 61.43 | 66.87 | 72.80 | 72.16 | 87.47 | 101.32 | 95.71 | 94.10 | 79.87 | 68.70 | 60.26 | 77.02 | ||||||||||||
| 1954 | 57.87 | 68.11 | 61.81 | 79.47 | 86.23 | 89.57 | 98.23 | 92.61 | 91.67 | 82.32 | 68.97 | 57.00 | 77.82 | |||||||||||||
| 1955 | 50.42 | 56.14 | 66.58 | 69.53 | 77.42 | 87.80 | 94.03 | 97.45 | 92.73 | 83.32 | 66.90 | 60.52 | 75.24 | |||||||||||||
| 1956 | 60.94 | 56.66 | 69.35 | 69.83 | 79.74 | 92.33 | 94.71 | 93.94 | 94.97 | 77.71 | 67.80 | 62.74 | 76.73 | |||||||||||||
| 1957 | 51.94 | 65.46 | 65.97 | 72.37 | 75.42 | 93.97 | 96.84 | 95.00 | 90.10 | 72.45 | 62.20 | 60.87 | 75.22 | |||||||||||||
| 1958 | 60.81 | 63.04 | 57.77 | 70.37 | 84.68 | 88.40 | 95.23 | 99.10 | 91.33 | 84.10 | 67.67 | 67.52 | 77.50 | |||||||||||||
| 1959 | 63.06 | 57.25 | 72.03 | 79.33 | 79.45 | 94.57 | 102.23 | 95.61 | 89.17 | 82.42 | 70.00 | 59.06 | 78.68 | |||||||||||||
| 1960 | 52.81 | 59.00 | 72.32 | 76.07 | 82.48 | 97.27 | 100.61 | 98.16 | 94.48 | a | 79.52 | 65.37 | 59.84 | 78.16 | ||||||||||||
| 1961 | 62.71 | 64.82 | 67.26 | 77.00 | 79.27 | a | 95.80 | 101.13 | 96.26 | 87.23 | 78.97 | 63.27 | 56.97 | 77.56 | ||||||||||||
| 1962 | 58.65 | 58.75 | 60.90 | 81.13 | 76.13 | 90.77 | 96.97 | 99.23 | 94.10 | 80.71 | 72.57 | 63.00 | 77.74 | |||||||||||||
| 1963 | 57.81 | 69.82 | 64.71 | 66.47 | 82.42 | 84.57 | 96.97 | 94.55 | 90.00 | 80.16 | 65.63 | 61.81 | 76.24 | |||||||||||||
| 1964 | 56.93 | a | 61.03 | 62.71 | 70.33 | 78.42 | 87.90 | 98.13 | 97.39 | 89.37 | 87.00 | 60.53 | 60.35 | 75.84 | ||||||||||||
| 1965 | 60.65 | 64.75 | 65.52 | 69.20 | 79.52 | 84.27 | 96.45 | b | 96.71 | 84.03 | 85.48 | 67.13 | 55.00 | 75.73 | ||||||||||||
| 1966 | 56.23 | 58.21 | 71.39 | 82.00 | 87.26 | 92.07 | 95.87 | 99.10 | b | 90.23 | 81.58 | 70.70 | 60.13 | 78.73 | ||||||||||||
| 1967 | 62.58 | 67.75 | 73.32 | 67.70 | 85.68 | 89.07 | 100.10 | 101.16 | 89.03 | 85.03 | 73.53 | 52.16 | 78.93 | |||||||||||||
| 1968 | 58.23 | a | 66.55 | 67.29 | 72.70 | 82.39 | 93.10 | 96.45 | 90.77 | 89.13 | 78.55 | 65.30 | 54.03 | 76.21 | ||||||||||||
| 1969 | 60.32 | 55.18 | 63.45 | 72.87 | 83.61 | 86.83 | 96.77 | 100.65 | 93.07 | 75.35 | 67.73 | 61.39 | 76.44 | |||||||||||||
| 1970 | 59.68 | 64.36 | 65.39 | 68.57 | 83.97 | 91.87 | 100.03 | 99.35 | 89.40 | 79.13 | 73.23 | 56.58 | 77.63 | |||||||||||||
| 1971 | 60.52 | 63.57 | 68.35 | 70.80 | 74.97 | 88.53 | 99.71 | 100.26 | 90.90 | 73.48 | 66.38 | a | 52.23 | 75.81 | ||||||||||||
| 1972 | 57.94 | 66.93 | 77.19 | 74.90 | 82.65 | 90.20 | 99.71 | 95.16 | 87.03 | 71.97 | 61.57 | 54.65 | 76.66 | |||||||||||||
| 1973 | 53.42 | 58.07 | 57.84 | 71.60 | 85.81 | 94.00 | 99.00 | 96.32 | 89.00 | 79.87 | 64.40 | 61.29 | 75.88 | |||||||||||||
| 1974 | 53.06 | 62.39 | 66.68 | 70.93 | 81.68 | 94.83 | 95.32 | 95.58 | 94.83 | 79.39 | 67.83 | 56.32 | 76.57 | |||||||||||||
| 1975 | 60.26 | 59.93 | 61.94 | 61.80 | 81.52 | 90.30 | 95.71 | 94.32 | 92.53 | 77.16 | 67.43 | 62.74 | 75.47 | |||||||||||||
| 1976 | 62.58 | 62.10 | 64.65 | 69.50 | 84.32 | 89.53 | 96.45 | 89.26 | 84.47 | 77.90 | 70.23 | 61.52 | 76.04 | |||||||||||||
| 1977 | 55.68 | 67.93 | 60.87 | 76.80 | 69.35 | 92.57 | 97.00 | 95.81 | 88.10 | 83.10 | 71.33 | 64.74 | 76.94 | |||||||||||||
| 1978 | 56.00 | 60.18 | 66.52 | 66.77 | 80.77 | 92.00 | 97.71 | 95.77 | 85.97 | 85.52 | 62.73 | 54.97 | 75.41 | |||||||||||||
| 1979 | 51.03 | 57.46 | 63.77 | 72.57 | 82.26 | 93.93 | a | 97.23 | 93.74 | 95.53 | 80.06 | 65.83 | 63.06 | 76.37 | ||||||||||||
| 1980 | 60.35 | 63.69 | 61.46 | c | 72.80 | 74.00 | 87.37 | 98.48 | 94.68 | 90.37 | 82.68 | 71.77 | 67.13 | 77.06 | ||||||||||||
| 1981 | 62.71 | 65.54 | 63.90 | 76.93 | c | 83.00 | 97.60 | 97.61 | 100.42 | 92.60 | 74.65 | 70.47 | 64.90 | 79.19 | ||||||||||||
| 1982 | 55.61 | 62.64 | 61.42 | 70.13 | 80.71 | 87.13 | 93.16 | 95.06 | 86.00 | 75.84 | 61.30 | 54.90 | 73.66 | |||||||||||||
| 1983 | 59.35 | 59.96 | 61.19 | 63.53 | 81.03 | 87.80 | 92.94 | 92.19 | 91.73 | 76.61 | 65.23 | 60.55 | 74.34 | |||||||||||||
| 1984 | 61.03 | 64.76 | 71.42 | 71.80 | 89.61 | 90.50 | 97.52 | 96.45 | 93.30 | 73.71 | 63.40 | 50.77 | 77.02 | |||||||||||||
| 1985 | 56.68 | 59.87 | e | 63.74 | 79.27 | 83.13 | 96.70 | 100.74 | 96.42 | 82.67 | 78.90 | 64.10 | 59.65 | 76.82 | ||||||||||||
| 1986 | 64.81 | 63.61 | 71.42 | 72.40 | 83.61 | 94.83 | 92.87 | 100.00 | 82.07 | 77.23 | 68.70 | 58.00 | 77.46 | |||||||||||||
| 1987 | 55.97 | 61.43 | 64.16 | 81.30 | 80.94 | 94.53 | 92.06 | 97.67 | a | 91.20 | 82.77 | 63.47 | 52.55 | 76.50 | ||||||||||||
| 1988 | 56.61 | 65.45 | 70.65 | 72.60 | 80.61 | 89.80 | 99.77 | 95.97 | 91.70 | 87.81 | 68.60 | 57.84 | 78.12 | |||||||||||||
| 1989 | 55.71 | 59.71 | 72.03 | 83.80 | 83.23 | 91.87 | 100.77 | 94.19 | 90.10 | 78.29 | 71.90 | 63.71 | 78.78 | |||||||||||||
| 1990 | 59.19 | 59.07 | 71.00 | 77.33 | 79.42 | 92.67 | 99.90 | 94.94 | 92.03 | 83.42 | 67.73 | 55.52 | 77.69 | |||||||||||||
| 1991 | 56.48 | 70.18 | 58.68 | 72.00 | 78.42 | 88.00 | 97.29 | 95.19 | 93.63 | 85.74 | 69.73 | 58.55 | 76.99 | |||||||||||||
| 1992 | 57.42 | 62.48 | 64.48 | 79.37 | 87.00 | 89.93 | 93.77 | 98.19 | 94.27 | 82.97 | 66.60 | 53.35 | 77.49 | |||||||||||||
| 1993 | 54.13 | 58.07 | ----- | z | 77.40 | 84.90 | 90.00 | 94.74 | ----- | z | 92.23 | 81.26 | 66.60 | 59.77 | 75.91 | |||||||||||
| 1994 | 63.35 | 58.21 | 70.97 | 76.43 | 81.97 | 97.00 | 100.45 | 101.13 | 91.80 | 78.19 | 59.70 | 58.68 | 78.16 | |||||||||||||
| 1995 | 56.00 | 68.89 | 64.71 | 72.37 | 76.94 | ----- | z | 99.29 | 101.26 | 95.73 | 85.52 | 76.73 | 62.71 | 78.20 | ||||||||||||
| 1996 | 64.45 | 64.97 | 70.03 | 78.73 | 86.74 | 95.77 | 102.32 | 102.13 | 91.90 | 79.35 | 69.07 | 61.03 | 80.54 | |||||||||||||
| 1997 | 58.19 | 64.54 | 76.77 | 75.43 | 92.13 | 90.43 | 97.13 | 98.61 | 91.80 | 78.77 | 69.70 | 55.45 | 79.08 | |||||||||||||
| 1998 | 61.65 | 56.00 | 66.03 | 68.77 | 73.45 | 85.40 | 100.19 | 101.61 | 87.97 | 78.61 | 69.00 | 59.13 | 75.65 | |||||||||||||
| 1999 | 65.16 | 63.18 | 68.55 | 68.10 | 82.97 | 90.70 | 96.55 | 96.84 | 93.73 | 87.42 | 74.20 | 63.71 | 79.26 | |||||||||||||
| 2000 | 64.26 | 62.97 | 69.71 | 79.52 | a | 91.23 | r | 102.00 | y | 101.78 | v | 98.18 | t | 93.53 | 78.32 | 64.53 | 65.45 | 72.29 | ||||||||
| 2001 | 56.81 | 57.39 | 71.06 | 72.37 | 93.39 | 96.63 | 96.48 | 101.52 | 96.27 | 87.35 | 69.87 | 57.97 | 79.76 | |||||||||||||
| 2002 | 61.00 | 68.18 | 68.90 | 78.70 | 85.10 | 97.20 | 102.81 | 100.29 | 94.10 | 80.42 | 71.13 | 59.42 | 80.60 | |||||||||||||
| 2003 | 68.45 | 61.61 | 69.48 | 68.60 | 85.42 | 95.57 | 104.81 | 99.42 | 98.30 | 90.03 | 61.83 | 59.26 | 80.23 | |||||||||||||
| 2004 | 61.23 | 58.52 | 77.58 | 78.00 | 86.16 | 95.97 | 99.74 | 98.45 | 92.73 | 76.48 | 62.57 | 59.00 | 78.87 | |||||||||||||
| 2005 | 58.42 | 59.71 | 67.87 | 74.93 | 86.87 | ----- | z | 103.52 | 100.35 | 89.23 | 79.39 | 71.93 | 63.97 | 77.84 | ||||||||||||
| 2006 | 61.26 | 67.71 | ----- | z | 70.70 | 90.03 | 98.27 | 103.00 | 97.55 | 93.97 | 80.00 | 73.73 | 61.16 | 81.58 | ||||||||||||
| 2007 | 59.06 | 66.07 | ----- | z | 80.60 | 89.35 | 96.70 | 102.35 | 101.42 | 92.53 | ----- | z | ----- | z | 56.06 | 82.68 | ||||||||||
| 2008 | 56.10 | 63.86 | 72.52 | 78.90 | 81.90 | 96.78 | g | 87.67 | a | 100.35 | 96.40 | ----- | z | ----- | z | ----- | z | 79.71 | ||||||||
| 2009 | 65.32 | 61.64 | 70.87 | 76.47 | 92.45 | 86.97 | 104.71 | ----- | z | 97.87 | ----- | z | ----- | z | ----- | z | 82.04 | |||||||||
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9999.00 | |
| 2011 | 55.63 | a | 57.81 | a | 63.74 | 72.00 | 75.35 | 88.73 | 95.35 | 97.10 | 92.17 | 79.39 | 62.47 | 59.52 | 74.94 | |||||||||||
| 2012 | 65.13 | 63.55 | 66.16 | 77.73 | 85.94 | 94.30 | 97.77 | 100.71 | 93.97 | 83.00 | 71.70 | 57.19 | 79.76 | |||||||||||||
| 2013 | 56.35 | 62.07 | 72.24 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 63.56 | |||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 58.71 | 62.08 | 67.03 | 74.17 | 82.59 | 91.61 | 98.07 | 97.22 | 91.33 | 80.24 | 67.36 | 59.36 | 77.26 | |||||||||||||
| S.D. | 4.13 | 3.81 | 4.58 | 4.65 | 4.71 | 3.81 | 3.06 | 2.87 | 3.28 | 3.96 | 4.29 | 4.09 | 1.63 | |||||||||||||
| SKEW | -0.48 | 0.11 | 0.01 | -0.16 | -0.23 | 0.04 | -0.30 | -0.19 | -0.54 | 0.17 | 0.17 | 0.31 | 0.18 | |||||||||||||
| MAX | 68.45 | 70.18 | 77.58 | 83.80 | 93.39 | 99.23 | 104.81 | 102.65 | 98.30 | 90.03 | 77.23 | 70.71 | 80.60 | |||||||||||||
| MIN | 44.10 | 54.75 | 57.26 | 61.80 | 69.35 | 83.70 | 87.67 | 89.26 | 82.07 | 71.97 | 59.17 | 50.77 | 73.66 | |||||||||||||
| NO YRS | 74 | 75 | 71 | 74 | 73 | 70 | 74 | 72 | 75 | 72 | 73 | 74 | 64 | |||||||||||||