| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.00 | n | 52.00 | ----- | z | |
| 1925 | 48.00 | 50.00 | 55.00 | 57.00 | 64.00 | 89.00 | 88.00 | 82.00 | 68.00 | 63.00 | 52.00 | 48.00 | 89.00 | |||||||||||||
| 1926 | 42.00 | 50.00 | 58.00 | 66.00 | 68.00 | 80.00 | 76.00 | 85.00 | 72.00 | a | 66.00 | 58.00 | a | 48.00 | 85.00 | b | ||||||||||
| 1927 | 54.00 | 58.00 | 60.00 | 70.00 | 74.00 | 80.00 | 86.00 | 80.00 | 72.00 | 68.00 | 60.00 | 56.00 | 86.00 | |||||||||||||
| 1928 | 58.00 | 58.00 | 54.00 | 62.00 | 80.00 | 82.00 | 84.00 | 78.00 | 78.00 | 64.00 | 56.00 | c | 48.00 | 84.00 | c | |||||||||||
| 1929 | 52.00 | a | 48.00 | 61.00 | 62.00 | 72.00 | a | 84.00 | a | 86.00 | 84.00 | 76.00 | 68.00 | 56.00 | 53.00 | a | 86.00 | d | ||||||||
| 1930 | 46.00 | 54.00 | 61.00 | 67.00 | 68.00 | 80.00 | 85.00 | c | 73.00 | 72.00 | 62.00 | 58.00 | 47.00 | 85.00 | c | |||||||||||
| 1931 | 50.00 | 52.00 | 64.00 | 65.00 | 74.00 | 76.00 | 91.00 | 82.00 | 75.00 | 68.00 | 59.00 | 52.00 | 91.00 | |||||||||||||
| 1932 | 57.00 | 70.00 | 62.00 | 62.00 | 72.00 | c | 85.00 | 83.00 | 84.00 | 82.00 | a | 66.00 | a | 60.00 | 52.00 | 85.00 | e | |||||||||
| 1933 | 50.00 | 50.00 | 71.00 | 75.00 | 80.00 | b | 88.00 | a | 96.00 | ----- | z | ----- | z | 74.00 | 61.00 | 57.00 | ----- | z | ||||||||
| 1934 | 52.00 | 54.00 | 60.00 | 69.00 | 73.00 | 82.00 | 81.00 | 81.00 | 78.00 | 67.00 | 59.00 | 50.00 | 82.00 | |||||||||||||
| 1935 | 54.00 | 58.00 | 56.00 | 64.00 | 72.00 | 74.00 | 80.00 | 78.00 | 74.00 | 59.00 | a | 47.00 | 48.00 | 80.00 | a | |||||||||||
| 1936 | 49.00 | 60.00 | 59.00 | 63.00 | 75.00 | 81.00 | 84.00 | 77.00 | 72.00 | a | 67.00 | 62.00 | 48.00 | a | 84.00 | b | ||||||||||
| 1937 | 40.00 | 48.00 | 58.00 | 68.00 | a | 80.00 | 80.00 | b | 86.00 | a | 88.00 | 78.00 | 72.00 | 57.00 | 56.00 | 88.00 | d | |||||||||
| 1938 | 50.00 | 54.00 | 52.00 | a | 68.00 | 70.00 | a | 72.00 | a | 84.00 | b | 84.00 | 78.00 | 68.00 | d | 58.00 | 64.00 | a | 84.00 | j | ||||||
| 1939 | 50.00 | 55.00 | a | 64.00 | 65.00 | 74.00 | 72.00 | 82.00 | 80.00 | 75.00 | 69.00 | 63.00 | a | 60.00 | 82.00 | b | ||||||||||
| 1940 | 50.00 | 51.00 | 68.00 | 67.00 | 72.00 | 82.00 | 75.00 | 79.00 | 70.00 | 72.00 | 58.00 | 60.00 | 82.00 | |||||||||||||
| 1941 | 47.00 | 51.00 | 60.00 | 60.00 | 69.00 | 72.00 | 88.00 | 76.00 | 80.00 | 71.00 | 66.00 | 51.00 | 88.00 | |||||||||||||
| 1942 | 54.00 | 40.00 | 56.00 | 62.00 | 62.00 | 78.00 | 82.00 | 82.00 | 78.00 | ----- | z | 68.00 | a | 56.00 | ----- | z | ||||||||||
| 1943 | 58.00 | 62.00 | 68.00 | ----- | z | 72.00 | 78.00 | 80.00 | 80.00 | 79.00 | 68.00 | 64.00 | 55.00 | ----- | z | |||||||||||
| 1944 | 56.00 | 55.00 | a | 58.00 | 68.00 | 72.00 | 76.00 | 82.00 | 84.00 | 80.00 | 74.00 | 54.00 | 50.00 | 84.00 | a | |||||||||||
| 1945 | 50.00 | 52.00 | c | 52.00 | a | 60.00 | c | ----- | z | ----- | z | 80.00 | 78.00 | 74.00 | 64.00 | 62.00 | 54.00 | a | ----- | z | ||||||
| 1946 | 52.00 | 50.00 | 50.00 | b | 62.00 | 60.00 | 82.00 | 86.00 | 89.00 | 81.00 | 74.00 | 62.00 | c | 64.00 | i | 89.00 | n | |||||||||
| 1947 | 67.00 | j | 58.00 | i | ----- | z | 67.00 | h | 68.00 | m | 62.00 | i | 70.00 | i | 68.00 | j | 68.00 | j | 62.00 | i | 56.00 | e | 48.00 | c | ----- | z |
| 1948 | 54.00 | a | 54.00 | h | 48.00 | h | 54.00 | i | 58.00 | i | 70.00 | g | 76.00 | j | 75.00 | m | 74.00 | v | 65.00 | j | 54.00 | j | 45.00 | g | ----- | z |
| 1949 | 49.00 | j | 52.00 | i | 54.00 | h | 64.00 | j | 64.00 | j | 72.00 | h | 75.00 | i | 76.00 | i | 74.00 | k | 68.00 | h | 60.00 | i | 50.00 | j | ----- | z |
| 1950 | 45.00 | j | 56.00 | i | 57.00 | f | 64.00 | f | 68.00 | h | 77.00 | e | 75.00 | h | 79.00 | d | 79.00 | c | 66.00 | d | ----- | z | ----- | z | ----- | z |
| 1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1987 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1988 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1989 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1990 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1991 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1992 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1993 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1994 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1995 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 2007 | ----- | z | ----- | z | ----- | 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 |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 51.00 | 53.64 | 59.41 | 64.86 | 71.57 | 79.55 | 83.86 | 81.05 | 75.95 | 67.73 | 58.96 | 52.74 | 85.07 | |||||||||||||
| S.D. | 4.57 | 6.02 | 5.40 | 4.13 | 5.31 | 4.76 | 4.66 | 3.85 | 3.81 | 4.00 | 4.56 | 4.65 | 3.01 | |||||||||||||
| SKEW | -0.56 | 0.52 | 0.33 | 0.38 | -0.37 | 0.09 | 0.45 | 0.16 | -0.35 | -0.11 | -0.43 | 0.70 | 0.28 | |||||||||||||
| MAX | 58.00 | 70.00 | 71.00 | 75.00 | 80.00 | 89.00 | 96.00 | 89.00 | 82.00 | 74.00 | 68.00 | 64.00 | 91.00 | |||||||||||||
| MIN | 40.00 | 40.00 | 50.00 | 57.00 | 60.00 | 72.00 | 75.00 | 73.00 | 68.00 | 59.00 | 47.00 | 47.00 | 80.00 | |||||||||||||
| YRS | 23 | 22 | 22 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 15 | |||||||||||||