| 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 | 13.00 | n | -14.00 | ----- | z | |
| 1925 | 1.00 | -0.00 | 6.00 | e | 2.00 | 20.00 | a | 16.00 | b | 28.00 | a | 18.00 | b | 20.00 | 10.00 | 8.00 | 3.00 | -0.00 | k | |||||||
| 1926 | -0.00 | -4.00 | 10.00 | 12.00 | 16.00 | 32.00 | 32.00 | 32.00 | 24.00 | b | 21.00 | 14.00 | a | -8.00 | -8.00 | c | ||||||||||
| 1927 | -0.00 | -4.00 | 4.00 | 8.00 | 22.00 | 36.00 | 46.00 | 40.00 | 28.00 | 24.00 | 14.00 | 14.00 | -4.00 | |||||||||||||
| 1928 | -0.00 | -0.00 | -0.00 | 10.00 | 24.00 | 26.00 | 40.00 | 42.00 | 34.00 | 15.00 | 10.00 | -3.00 | -3.00 | |||||||||||||
| 1929 | -2.00 | a | -16.00 | -3.00 | -2.00 | 20.00 | a | 26.00 | 48.00 | 50.00 | 34.00 | 20.00 | a | 16.00 | 20.00 | -16.00 | c | |||||||||
| 1930 | -7.00 | -0.00 | 3.00 | 7.00 | 12.00 | 28.00 | 42.00 | c | 42.00 | 23.00 | 22.00 | 9.00 | 10.00 | -7.00 | c | |||||||||||
| 1931 | 3.00 | a | 2.00 | b | 7.00 | 18.00 | 30.00 | 32.00 | 46.00 | 45.00 | 24.00 | 21.00 | 4.00 | a | 1.00 | 1.00 | d | |||||||||
| 1932 | -4.00 | a | -4.00 | 2.00 | 2.00 | 16.00 | a | 25.00 | 22.00 | 32.00 | 32.00 | 16.00 | a | 15.00 | -15.00 | -15.00 | c | |||||||||
| 1933 | -0.00 | -0.00 | 7.00 | 9.00 | 22.00 | 41.00 | 52.00 | ----- | z | ----- | z | 18.00 | 9.00 | 2.00 | ----- | z | ||||||||||
| 1934 | 6.00 | -0.00 | 17.00 | 11.00 | 22.00 | 26.00 | 41.00 | 41.00 | 20.00 | 20.00 | 6.00 | 4.00 | -0.00 | |||||||||||||
| 1935 | -3.00 | -9.00 | -10.00 | 6.00 | 18.00 | 30.00 | 32.00 | 40.00 | 30.00 | 10.00 | 2.00 | 6.00 | -10.00 | |||||||||||||
| 1936 | 6.00 | -0.00 | -3.00 | 8.00 | 17.00 | 25.00 | 33.00 | 42.00 | 28.00 | 24.00 | a | 17.00 | a | 6.00 | -3.00 | b | ||||||||||
| 1937 | -20.00 | -4.00 | 6.00 | 8.00 | 22.00 | 24.00 | 44.00 | 40.00 | 34.00 | 24.00 | 20.00 | 12.00 | a | -20.00 | a | |||||||||||
| 1938 | 2.00 | a | 2.00 | -4.00 | 6.00 | 10.00 | 28.00 | 34.00 | a | 36.00 | 34.00 | 18.00 | a | -3.00 | 8.00 | -4.00 | c | |||||||||
| 1939 | 5.00 | -12.00 | a | -4.00 | 16.00 | 20.00 | 21.00 | 39.00 | 44.00 | 26.00 | 13.00 | 19.00 | a | 7.00 | -12.00 | b | ||||||||||
| 1940 | -0.00 | -2.00 | -3.00 | 7.00 | 24.00 | 34.00 | 42.00 | 42.00 | 28.00 | 19.00 | 10.00 | -1.00 | -3.00 | |||||||||||||
| 1941 | 3.00 | 1.00 | 5.00 | 3.00 | 18.00 | 26.00 | 39.00 | 33.00 | 24.00 | 16.00 | 10.00 | -6.00 | -6.00 | |||||||||||||
| 1942 | -10.00 | -6.00 | -4.00 | -2.00 | 8.00 | 28.00 | 44.00 | 32.00 | 28.00 | ----- | z | 4.00 | a | 10.00 | ----- | z | ||||||||||
| 1943 | -2.00 | -2.00 | 2.00 | 10.00 | 14.00 | 20.00 | 38.00 | 36.00 | 39.00 | 22.00 | 16.00 | 3.00 | -2.00 | |||||||||||||
| 1944 | -6.00 | -8.00 | -10.00 | 6.00 | 20.00 | 21.00 | 36.00 | 36.00 | 30.00 | 26.00 | 8.00 | 2.00 | -10.00 | |||||||||||||
| 1945 | -12.00 | -4.00 | c | -12.00 | a | -2.00 | c | 18.00 | a | 24.00 | c | 43.00 | 38.00 | 26.00 | 20.00 | 10.00 | 2.00 | a | -12.00 | l | ||||||
| 1946 | -4.00 | a | -10.00 | 2.00 | b | 2.00 | 24.00 | 24.00 | 32.00 | 36.00 | 14.00 | 6.00 | -2.00 | -7.00 | j | -10.00 | m | |||||||||
| 1947 | -18.00 | j | 7.00 | g | 13.00 | l | 5.00 | i | 22.00 | m | 28.00 | i | ----- | z | 32.00 | j | 26.00 | j | 28.00 | i | 4.00 | e | -0.00 | e | ----- | z |
| 1948 | -6.00 | a | -14.00 | h | -4.00 | h | 2.00 | i | 12.00 | i | 22.00 | g | 38.00 | h | 38.00 | m | 30.00 | v | 20.00 | j | 14.00 | j | -4.00 | g | ----- | z |
| 1949 | -18.00 | j | -14.00 | i | -0.00 | h | 10.00 | j | 21.00 | j | 26.00 | h | 41.00 | i | 38.00 | i | 30.00 | k | 8.00 | h | 20.00 | i | -9.00 | j | ----- | z |
| 1950 | -13.00 | j | 3.00 | i | -5.00 | f | 1.00 | f | 5.00 | h | 18.00 | e | 41.00 | h | 37.00 | d | 17.00 | c | 19.00 | 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 | -2.17 | -3.64 | 0.82 | 6.59 | 18.95 | 26.57 | 38.77 | 37.91 | 27.14 | 18.36 | 9.57 | 2.74 | -7.18 | |||||||||||||
| S.D. | 6.12 | 4.82 | 6.99 | 5.35 | 5.06 | 5.82 | 7.12 | 6.41 | 6.17 | 5.10 | 6.27 | 8.34 | 5.93 | |||||||||||||
| SKEW | -1.10 | -0.97 | 0.11 | 0.14 | -0.26 | 0.50 | -0.40 | -1.10 | -0.22 | -0.79 | -0.24 | -0.32 | -0.65 | |||||||||||||
| MAX | 6.00 | 2.00 | 17.00 | 18.00 | 30.00 | 41.00 | 52.00 | 50.00 | 39.00 | 26.00 | 20.00 | 20.00 | 1.00 | |||||||||||||
| MIN | -20.00 | -16.00 | -12.00 | -2.00 | 8.00 | 16.00 | 22.00 | 18.00 | 14.00 | 6.00 | -3.00 | -15.00 | -20.00 | |||||||||||||
| YRS | 23 | 22 | 22 | 22 | 22 | 23 | 22 | 22 | 22 | 22 | 23 | 23 | 17 | |||||||||||||