| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1932 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1935 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1936 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1937 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.00 | 83.00 | 95.00 | 81.00 | 72.00 | 67.00 | 57.00 | ----- | z | |||||||
| 1949 | 55.00 | 54.00 | 61.00 | 66.00 | 72.00 | 85.00 | 89.00 | 89.00 | 79.00 | 76.00 | 62.00 | a | 58.00 | 89.00 | a | |||||||||||
| 1950 | 57.00 | 51.00 | 55.00 | 66.00 | 67.00 | 81.00 | 84.00 | b | 79.00 | 78.00 | 78.00 | 67.00 | 59.00 | 84.00 | b | |||||||||||
| 1951 | 56.00 | a | 55.00 | 55.00 | 68.00 | 77.00 | 82.00 | 87.00 | 83.00 | 78.00 | 71.00 | 67.00 | a | 59.00 | 87.00 | b | ||||||||||
| 1952 | 53.00 | 52.00 | 52.00 | 73.00 | 72.00 | 90.00 | 90.00 | 83.00 | 82.00 | 72.00 | 64.00 | 55.00 | 90.00 | |||||||||||||
| 1953 | 52.00 | 54.00 | b | 58.00 | 64.00 | 70.00 | 82.00 | 87.00 | 87.00 | 87.00 | 75.00 | 65.00 | 64.00 | 87.00 | b | |||||||||||
| 1954 | 53.00 | 53.00 | 58.00 | 66.00 | 74.00 | 83.00 | 81.00 | 81.00 | 82.00 | 73.00 | 61.00 | 56.00 | 83.00 | |||||||||||||
| 1955 | 49.00 | 50.00 | 55.00 | 70.00 | 77.00 | 82.00 | 91.00 | 88.00 | 77.00 | 75.00 | 58.00 | a | 48.00 | 91.00 | a | |||||||||||
| 1956 | 47.00 | 48.00 | 47.00 | a | 69.00 | 75.00 | 88.00 | 80.00 | 85.00 | 79.00 | 73.00 | 70.00 | 59.00 | 88.00 | a | |||||||||||
| 1957 | 53.00 | 54.00 | 57.00 | 68.00 | 71.00 | 88.00 | 88.00 | 85.00 | 78.00 | 70.00 | a | 63.00 | 58.00 | 88.00 | a | |||||||||||
| 1958 | 53.00 | 45.00 | 49.00 | 68.00 | 69.00 | 77.00 | 81.00 | 79.00 | 76.00 | 72.00 | 61.00 | 56.00 | 81.00 | |||||||||||||
| 1959 | 53.00 | 48.00 | 54.00 | 68.00 | 78.00 | 82.00 | 80.00 | a | 88.00 | 82.00 | 75.00 | 65.00 | 57.00 | 88.00 | a | |||||||||||
| 1960 | 54.00 | 52.00 | 60.00 | 70.00 | 72.00 | 79.00 | 81.00 | 82.00 | 78.00 | 69.00 | 62.00 | 54.00 | 82.00 | |||||||||||||
| 1961 | 50.00 | 53.00 | a | 54.00 | 67.00 | 65.00 | 80.00 | 88.00 | 82.00 | 83.00 | 71.00 | 66.00 | 55.00 | 88.00 | a | |||||||||||
| 1962 | 57.00 | 48.00 | 53.00 | 61.00 | 77.00 | 82.00 | 81.00 | 88.00 | 77.00 | 71.00 | 59.00 | 62.00 | 88.00 | |||||||||||||
| 1963 | 48.00 | 45.00 | 59.00 | 67.00 | 72.00 | 86.00 | 88.00 | 81.00 | 73.00 | 73.00 | 61.00 | 54.00 | 88.00 | |||||||||||||
| 1964 | 50.00 | 45.00 | 50.00 | 70.00 | 75.00 | 83.00 | 85.00 | 82.00 | 83.00 | 67.00 | 60.00 | 54.00 | 85.00 | |||||||||||||
| 1965 | 49.00 | 52.00 | 51.00 | 61.00 | 81.00 | 80.00 | 82.00 | 82.00 | 78.00 | 66.00 | 63.00 | 53.00 | 82.00 | |||||||||||||
| 1966 | 52.00 | 50.00 | 52.00 | 61.00 | 75.00 | 84.00 | 86.00 | 82.00 | 83.00 | 66.00 | 65.00 | 56.00 | 86.00 | |||||||||||||
| 1967 | 56.00 | 50.00 | 49.00 | 68.00 | 63.00 | 78.00 | 82.00 | 79.00 | 78.00 | 77.00 | 61.00 | 54.00 | 82.00 | |||||||||||||
| 1968 | 44.00 | 47.00 | 58.00 | 63.00 | 69.00 | 81.00 | 88.00 | 86.00 | 81.00 | 74.00 | 63.00 | 55.00 | 88.00 | |||||||||||||
| 1969 | 48.00 | 39.00 | 49.00 | 65.00 | 82.00 | 85.00 | 85.00 | 83.00 | 85.00 | 72.00 | 63.00 | 57.00 | 85.00 | |||||||||||||
| 1970 | 45.00 | 53.00 | 51.00 | 64.00 | 76.00 | 76.00 | 83.00 | 84.00 | 78.00 | 72.00 | 61.00 | 57.00 | 84.00 | |||||||||||||
| 1971 | 53.00 | 52.00 | 52.00 | 56.00 | 69.00 | 81.00 | 87.00 | 85.00 | 79.00 | 74.00 | 67.00 | 59.00 | 87.00 | |||||||||||||
| 1972 | 54.00 | 53.00 | 53.00 | 61.00 | 69.00 | 75.00 | 91.00 | 86.00 | 76.00 | 67.00 | 65.00 | 58.00 | 91.00 | |||||||||||||
| 1973 | 55.00 | 55.00 | 55.00 | 73.00 | 76.00 | 79.00 | 85.00 | 91.00 | 83.00 | 73.00 | 61.00 | 59.00 | 91.00 | |||||||||||||
| 1974 | 54.00 | 55.00 | 55.00 | 69.00 | 71.00 | 79.00 | 83.00 | 83.00 | 82.00 | 68.00 | 66.00 | 57.00 | 83.00 | |||||||||||||
| 1975 | 56.00 | 50.00 | 52.00 | 59.00 | 76.00 | 80.00 | 84.00 | 91.00 | 73.00 | 71.00 | d | 72.00 | 60.00 | 91.00 | d | |||||||||||
| 1976 | 54.00 | 62.00 | 62.00 | 84.00 | a | 81.00 | 88.00 | 83.00 | 90.00 | 81.00 | 70.00 | 56.00 | 53.00 | 90.00 | a | |||||||||||
| 1977 | 48.00 | 44.00 | 74.00 | 73.00 | 78.00 | 78.00 | 88.00 | 86.00 | 84.00 | 71.00 | 67.00 | 55.00 | 88.00 | |||||||||||||
| 1978 | 55.00 | 43.00 | 55.00 | 64.00 | 73.00 | 82.00 | 86.00 | 84.00 | 76.00 | 69.00 | 63.00 | 59.00 | 86.00 | |||||||||||||
| 1979 | 54.00 | 45.00 | 61.00 | 66.00 | 73.00 | 76.00 | 84.00 | 86.00 | 82.00 | 72.00 | 66.00 | 58.00 | 86.00 | |||||||||||||
| 1980 | 56.00 | 48.00 | 54.00 | 64.00 | 73.00 | 77.00 | 85.00 | 86.00 | 80.00 | 67.00 | 59.00 | 59.00 | 86.00 | |||||||||||||
| 1981 | 43.00 | 55.00 | 60.00 | 67.00 | 75.00 | 80.00 | 84.00 | 82.00 | 75.00 | 64.00 | 60.00 | 55.00 | 84.00 | |||||||||||||
| 1982 | 55.00 | a | 52.00 | 50.00 | 62.00 | 72.00 | 78.00 | 87.00 | 82.00 | 80.00 | 74.00 | 66.00 | 60.00 | 87.00 | a | |||||||||||
| 1983 | 56.00 | 53.00 | 57.00 | 74.00 | 74.00 | 87.00 | 88.00 | 86.00 | 87.00 | 74.00 | 62.00 | 60.00 | 88.00 | |||||||||||||
| 1984 | 51.00 | 55.00 | 49.00 | 64.00 | 73.00 | 85.00 | 85.00 | 86.00 | 78.00 | 72.00 | 67.00 | 61.00 | 86.00 | |||||||||||||
| 1985 | 58.00 | a | 50.00 | 66.00 | 68.00 | 76.00 | 77.00 | 86.00 | 84.00 | 84.00 | 72.00 | 66.00 | 60.00 | 86.00 | a | |||||||||||
| 1986 | 57.00 | 50.00 | 70.00 | 71.00 | 80.00 | 79.00 | 83.00 | 81.00 | 75.00 | 80.00 | 62.00 | 59.00 | 83.00 | |||||||||||||
| 1987 | 50.00 | 44.00 | 68.00 | 65.00 | 83.00 | 85.00 | 88.00 | 88.00 | 79.00 | 70.00 | 62.00 | 54.00 | 88.00 | |||||||||||||
| 1988 | 47.00 | 48.00 | 55.00 | 64.00 | 81.00 | 83.00 | 85.00 | 83.00 | 77.00 | 69.00 | 61.00 | 56.00 | 85.00 | |||||||||||||
| 1989 | 53.00 | ----- | z | 56.00 | ----- | z | 75.00 | 82.00 | 83.00 | 82.00 | 87.00 | 71.00 | 61.00 | 51.00 | ----- | z | ||||||||||
| 1990 | 58.00 | 53.00 | 65.00 | 81.00 | 66.00 | 81.00 | 86.00 | 86.00 | 86.00 | 76.00 | 67.00 | 57.00 | 86.00 | |||||||||||||
| 1991 | 53.00 | 55.00 | 62.00 | 67.00 | 78.00 | 88.00 | 88.00 | 83.00 | a | 81.00 | 73.00 | 61.00 | 58.00 | a | 88.00 | b | ||||||||||
| 1992 | 55.00 | c | 54.00 | a | 56.00 | b | 64.00 | 85.00 | 78.00 | 84.00 | 82.00 | 76.00 | 69.00 | 61.00 | 54.00 | a | 85.00 | g | ||||||||
| 1993 | 55.00 | a | 47.00 | a | 62.00 | 64.00 | 73.00 | 84.00 | 92.00 | 89.00 | 82.00 | 72.00 | 65.00 | a | 60.00 | a | 92.00 | d | ||||||||
| 1994 | 55.00 | e | 54.00 | 58.00 | 69.00 | 70.00 | a | 86.00 | 89.00 | ----- | z | 79.00 | ----- | z | 68.00 | b | 57.00 | c | ----- | z | ||||||
| 1995 | 62.00 | c | 54.00 | c | 53.00 | b | 63.00 | a | 75.00 | a | 85.00 | ----- | z | ----- | z | 81.00 | ----- | z | ----- | z | 54.00 | c | ----- | z | ||
| 1996 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1997 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1998 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 75.00 | h | 72.00 | a | 66.00 | 63.00 | g | ----- | z | |
| 2007 | 59.00 | c | 46.00 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 52.92 | 50.53 | 56.32 | 66.85 | 74.13 | 81.83 | 85.40 | 84.67 | 79.98 | 71.70 | 63.56 | 56.88 | 86.65 | |||||||||||||
| S.D. | 3.99 | 4.29 | 5.84 | 5.10 | 4.74 | 3.68 | 3.03 | 3.45 | 3.52 | 3.24 | 3.25 | 2.94 | 2.77 | |||||||||||||
| SKEW | -0.51 | -0.29 | 0.94 | 1.04 | 0.02 | 0.24 | 0.12 | 0.66 | 0.17 | 0.01 | 0.17 | -0.35 | -0.12 | |||||||||||||
| MAX | 62.00 | 62.00 | 74.00 | 84.00 | 85.00 | 90.00 | 92.00 | 95.00 | 87.00 | 80.00 | 72.00 | 64.00 | 92.00 | |||||||||||||
| MIN | 43.00 | 39.00 | 47.00 | 56.00 | 63.00 | 75.00 | 80.00 | 79.00 | 73.00 | 64.00 | 56.00 | 48.00 | 81.00 | |||||||||||||
| YRS | 48 | 47 | 47 | 46 | 47 | 48 | 47 | 46 | 48 | 47 | 48 | 48 | 43 | |||||||||||||