| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1914 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1915 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1916 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1918 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1919 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1920 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1921 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1922 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
| 1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 95.00 | a | 96.00 | 93.00 | 90.00 | 83.00 | 77.00 | 66.00 | ----- | z | ||||||
| 1928 | 68.00 | 66.00 | 75.00 | 85.00 | 89.00 | 100.00 | 102.00 | 101.00 | c | 93.00 | 88.00 | 73.00 | 69.00 | 102.00 | c | |||||||||||
| 1929 | 65.00 | 66.00 | 76.00 | 77.00 | 86.00 | a | 100.00 | b | 96.00 | 92.00 | 89.00 | 87.00 | a | 74.00 | 72.00 | g | 100.00 | k | ||||||||
| 1930 | 59.00 | i | 71.00 | a | ----- | z | 83.00 | 74.00 | p | ----- | z | 106.00 | 99.00 | 96.00 | 84.00 | e | 77.00 | 65.00 | e | ----- | z | |||||
| 1931 | 68.00 | 62.00 | ----- | z | 80.00 | 90.00 | a | 100.00 | 100.00 | h | 95.00 | 92.00 | b | ----- | z | 84.00 | 60.00 | g | ----- | z | ||||||
| 1932 | ----- | z | ----- | z | 77.00 | p | 80.00 | 86.00 | e | ----- | z | ----- | z | ----- | z | 87.00 | i | 80.00 | 75.00 | 68.00 | ----- | z | ||||
| 1933 | 62.00 | 68.00 | 78.00 | 84.00 | 84.00 | ----- | z | ----- | z | 94.00 | ----- | z | 84.00 | 78.00 | 75.00 | l | ----- | z | ||||||||
| 1934 | ----- | z | 73.00 | 80.00 | 85.00 | 97.00 | 96.00 | c | 100.00 | 99.00 | 92.00 | 90.00 | ----- | z | ----- | z | ----- | z | ||||||||
| 1935 | 72.00 | 72.00 | a | 74.00 | 82.00 | a | 82.00 | g | 94.00 | 96.00 | 96.00 | n | ----- | z | ----- | z | 70.00 | 67.00 | ----- | z | ||||||
| 1936 | 65.00 | 66.00 | 76.00 | 84.00 | a | ----- | z | ----- | z | ----- | z | 95.00 | p | 94.00 | ----- | z | ----- | z | 68.00 | k | ----- | z | ||||
| 1937 | 54.00 | 68.00 | 72.00 | 86.00 | a | ----- | z | 98.00 | 102.00 | i | ----- | z | 94.00 | 85.00 | a | 81.00 | 72.00 | ----- | z | |||||||
| 1938 | 66.00 | 68.00 | h | 70.00 | c | 85.00 | ----- | z | 97.00 | 99.00 | l | 102.00 | 91.00 | ----- | z | 73.00 | 73.00 | ----- | z | |||||||
| 1939 | 64.00 | 60.00 | 79.00 | 83.00 | 91.00 | 110.00 | 114.00 | 106.00 | 94.00 | 87.00 | 81.00 | a | 84.00 | a | 114.00 | b | ||||||||||
| 1940 | 76.00 | 76.00 | 83.00 | 88.00 | ----- | z | 110.00 | ----- | z | ----- | z | 96.00 | a | ----- | z | 76.00 | 69.00 | ----- | z | |||||||
| 1941 | 60.00 | k | 68.00 | 67.00 | 71.00 | 88.00 | 92.00 | 94.00 | a | 94.00 | 91.00 | 80.00 | 73.00 | 66.00 | 94.00 | l | ||||||||||
| 1942 | 68.00 | a | 64.00 | 73.00 | 77.00 | 90.00 | 96.00 | 100.00 | a | 93.00 | 93.00 | 85.00 | 73.00 | 69.00 | c | 100.00 | e | |||||||||
| 1943 | 66.00 | 72.00 | 76.00 | 89.00 | 89.00 | 96.00 | ----- | z | 93.00 | 93.00 | 82.00 | 73.00 | 66.00 | ----- | z | |||||||||||
| 1944 | 65.00 | 68.00 | 69.00 | 73.00 | 85.00 | 95.00 | 96.00 | 98.00 | 93.00 | 84.00 | 73.00 | 65.00 | 98.00 | |||||||||||||
| 1945 | 63.00 | 70.00 | 70.00 | 83.00 | 82.00 | 97.00 | 99.00 | ----- | z | 97.00 | 80.00 | 75.00 | b | 67.00 | ----- | z | ||||||||||
| 1946 | 68.00 | 72.00 | 74.00 | 85.00 | 86.00 | 97.00 | 97.00 | 103.00 | 93.00 | 78.00 | w | 71.00 | 71.00 | 103.00 | w | |||||||||||
| 1947 | 67.00 | 69.00 | 74.00 | 81.00 | 94.00 | 95.00 | 99.00 | 97.00 | 97.00 | 90.00 | 77.00 | 67.00 | 99.00 | |||||||||||||
| 1948 | 70.00 | 70.00 | a | 70.00 | a | 86.00 | 90.00 | 97.00 | 102.00 | 99.00 | 100.00 | 84.00 | 70.00 | 62.00 | 102.00 | b | ||||||||||
| 1949 | 56.00 | 69.00 | 74.00 | 87.00 | 92.00 | 96.00 | d | 98.00 | a | 98.00 | 95.00 | 87.00 | 79.00 | 66.00 | 98.00 | e | ||||||||||
| 1950 | 73.00 | 74.00 | 79.00 | a | 87.00 | 92.00 | 102.00 | 99.00 | a | 102.00 | 101.00 | 92.00 | 79.00 | 74.00 | a | 102.00 | c | |||||||||
| 1951 | 69.00 | 75.00 | 74.00 | 79.00 | a | 97.00 | 99.00 | 104.00 | 101.00 | b | 92.00 | 84.00 | 72.00 | 64.00 | 104.00 | c | ||||||||||
| 1952 | 66.00 | 64.00 | 68.00 | 80.00 | 85.00 | 93.00 | 95.00 | 99.00 | 97.00 | 88.00 | 76.00 | 63.00 | 99.00 | |||||||||||||
| 1953 | 74.00 | 75.00 | 77.00 | 82.00 | 85.00 | 99.00 | 100.00 | 97.00 | 95.00 | 87.00 | 77.00 | a | 67.00 | a | 100.00 | b | ||||||||||
| 1954 | 68.00 | a | 73.00 | 74.00 | 84.00 | 88.00 | 100.00 | a | 96.00 | a | 95.00 | 92.00 | 86.00 | 78.00 | 68.00 | i | 100.00 | l | ||||||||
| 1955 | 62.00 | g | 71.00 | d | 73.00 | f | 80.00 | 89.00 | d | 95.00 | a | 92.00 | d | ----- | z | ----- | z | ----- | z | ----- | z | 66.00 | k | ----- | z | |
| 1956 | 76.00 | f | 67.00 | h | 79.00 | d | 77.00 | j | 92.00 | e | 100.00 | f | 100.00 | a | 96.00 | 96.00 | 87.00 | a | 75.00 | 66.00 | a | ----- | z | |||
| 1957 | 60.00 | 77.00 | 74.00 | 76.00 | 85.00 | 99.00 | 101.00 | 91.00 | 94.00 | 83.00 | 68.00 | 65.00 | a | 101.00 | a | |||||||||||
| 1958 | 62.00 | 77.00 | 65.00 | 82.00 | 95.00 | a | 95.00 | 103.00 | 97.00 | 90.00 | 88.00 | 71.00 | 75.00 | 103.00 | a | |||||||||||
| 1959 | 67.00 | a | 67.00 | 69.00 | 86.00 | 94.00 | a | 100.00 | 97.00 | 90.00 | 91.00 | 86.00 | f | 67.00 | 65.00 | 100.00 | h | |||||||||
| 1960 | 58.00 | 60.00 | 75.00 | b | 81.00 | 91.00 | 97.00 | 100.00 | 99.00 | d | 94.00 | 83.00 | 74.00 | 65.00 | 100.00 | f | ||||||||||
| 1961 | 65.00 | 70.00 | 73.00 | b | 82.00 | 87.00 | 99.00 | 101.00 | 96.00 | 86.00 | 83.00 | b | 69.00 | 61.00 | 101.00 | d | ||||||||||
| 1962 | 65.00 | 68.00 | 74.00 | i | 87.00 | 84.00 | 96.00 | b | 95.00 | 98.00 | 93.00 | 80.00 | 76.00 | 68.00 | 98.00 | k | ||||||||||
| 1963 | 60.00 | 77.00 | 70.00 | a | 80.00 | 87.00 | 92.00 | b | 98.00 | a | 90.00 | 89.00 | 84.00 | 75.00 | 68.00 | 98.00 | d | |||||||||
| 1964 | 63.00 | 62.00 | 75.00 | 79.00 | 90.00 | 95.00 | 99.00 | 93.00 | 91.00 | a | 97.00 | 77.00 | 67.00 | 99.00 | a | |||||||||||
| 1965 | 67.00 | 79.00 | 74.00 | 86.00 | 88.00 | 94.00 | 100.00 | 98.00 | r | 89.00 | 97.00 | ----- | 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 | 79.00 | 66.00 | ----- | z | ||
| 1968 | 60.00 | 72.00 | 77.00 | 76.00 | 93.00 | 101.00 | a | 100.00 | 92.00 | d | 97.00 | f | 91.00 | e | 70.00 | d | 68.00 | i | ----- | z | ||||||
| 1969 | 68.00 | i | 65.00 | 79.00 | d | 83.00 | e | 88.00 | g | 98.00 | o | 100.00 | n | 98.00 | l | 94.00 | h | 88.00 | e | 70.00 | f | 70.00 | c | ----- | z | |
| 1970 | 56.00 | s | 69.00 | a | 71.00 | b | 77.00 | 92.00 | a | 98.00 | m | 105.00 | g | 96.00 | o | 94.00 | h | ----- | z | 71.00 | 69.00 | ----- | z | |||
| 1971 | 74.00 | 72.00 | a | 80.00 | 82.00 | 85.00 | 102.00 | c | 106.00 | f | 98.00 | c | 96.00 | 82.00 | a | 72.00 | 66.00 | 106.00 | n | |||||||
| 1972 | 62.00 | 74.00 | 80.00 | 83.00 | 89.00 | 101.00 | 103.00 | 100.00 | 89.00 | 90.00 | 67.00 | 68.00 | 103.00 | |||||||||||||
| 1973 | ----- | z | 64.00 | 64.00 | 79.00 | 89.00 | p | 105.00 | b | 106.00 | d | ----- | z | ----- | z | ----- | z | ----- | z | 64.00 | f | ----- | z | |||
| 1974 | 70.00 | 65.00 | 76.00 | ----- | z | ----- | z | ----- | z | ----- | z | 96.00 | e | 97.00 | a | 71.00 | r | 73.00 | 59.00 | ----- | z | |||||
| 1975 | 70.00 | 68.00 | 71.00 | 74.00 | 88.00 | ----- | z | 98.00 | f | ----- | z | 93.00 | 85.00 | 76.00 | ----- | z | ----- | z | ||||||||
| 1976 | ----- | z | ----- | z | ----- | z | 78.00 | 88.00 | 97.00 | 99.00 | 94.00 | 92.00 | ----- | z | ----- | z | ----- | z | ----- | z | ||||||
| 1977 | 58.00 | t | 75.00 | a | 71.00 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 89.00 | 76.00 | 68.00 | ----- | z | |||
| 1978 | 64.00 | 64.00 | 74.00 | 84.00 | 84.00 | 98.00 | 98.00 | a | 90.00 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | |||||||
| 1979 | 67.00 | ----- | 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 |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 65.82 | 69.49 | 74.00 | 81.76 | 88.90 | 98.00 | 99.47 | 96.49 | 93.25 | 86.05 | 74.44 | 67.53 | 101.67 | |||||||||||||
| S.D. | 4.83 | 4.78 | 4.27 | 4.10 | 3.70 | 3.99 | 4.02 | 3.93 | 3.10 | 4.15 | 3.83 | 4.27 | 3.90 | |||||||||||||
| SKEW | -0.20 | -0.06 | -0.26 | -0.55 | 0.37 | 1.28 | 1.26 | 0.19 | 0.23 | 0.79 | 0.10 | 1.47 | 2.15 | |||||||||||||
| MAX | 76.00 | 79.00 | 83.00 | 89.00 | 97.00 | 110.00 | 114.00 | 106.00 | 101.00 | 97.00 | 84.00 | 84.00 | 114.00 | |||||||||||||
| MIN | 54.00 | 60.00 | 64.00 | 71.00 | 82.00 | 92.00 | 92.00 | 90.00 | 86.00 | 80.00 | 67.00 | 59.00 | 98.00 | |||||||||||||
| YRS | 39 | 45 | 42 | 46 | 39 | 40 | 36 | 37 | 40 | 37 | 43 | 38 | 15 | |||||||||||||