YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 96.50 | 98.42 | 95.32 | 92.13 | 86.84 | 72.00 | 72.00 | 87.60 | e | |||||||
1918 | 67.35 | 66.43 | 68.39 | 75.40 | 76.26 | 95.87 | 95.87 | 92.06 | 90.77 | ----- | z | 65.83 | 63.55 | 77.98 | a | |||||||||||
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 | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | 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 | 93.93 | d | 89.21 | b | 97.52 | h | 101.17 | g | 97.63 | c | 85.13 | a | 75.66 | a | 66.29 | 84.64 | f | |
1998 | 66.94 | 61.39 | 70.17 | b | 74.11 | c | 73.64 | c | 85.53 | 101.58 | 104.77 | 88.66 | a | 83.71 | 75.70 | 68.93 | a | 79.60 | ||||||||
1999 | 72.10 | 71.32 | 72.52 | 72.93 | c | 83.52 | 92.24 | a | 97.34 | b | 99.52 | 94.00 | 93.43 | a | 80.33 | 72.76 | b | 83.50 | ||||||||
2000 | 73.44 | d | 67.63 | b | 72.73 | a | 83.17 | 90.23 | 96.33 | 98.48 | 99.00 | 94.97 | a | 79.55 | 71.97 | 74.40 | a | 83.49 | ||||||||
2001 | 65.21 | b | 64.00 | 72.20 | a | 74.28 | a | 92.93 | a | 95.21 | a | 96.13 | a | 100.45 | 96.53 | 89.47 | a | 74.97 | 66.19 | 82.30 | ||||||
2002 | 70.43 | a | 76.50 | 72.94 | 78.38 | a | 84.03 | 93.10 | 98.70 | a | 96.71 | 96.47 | 78.72 | b | 78.03 | 66.13 | a | 82.51 | ||||||||
2003 | 77.68 | 65.89 | a | 73.23 | a | 71.38 | a | 84.16 | 88.00 | 99.87 | 100.03 | a | 98.47 | 91.68 | 69.50 | 67.06 | 82.25 | |||||||||
2004 | 69.48 | 65.64 | a | 83.10 | a | 79.93 | b | 86.53 | a | 89.77 | 98.58 | 96.83 | a | 94.93 | 80.35 | 67.97 | 68.16 | 81.77 | ||||||||
2005 | 66.30 | a | 64.93 | 71.58 | 78.10 | 85.97 | 88.97 | a | 100.68 | 98.52 | 90.90 | a | 82.34 | b | 78.07 | a | 71.16 | 81.46 | ||||||||
2006 | 70.80 | a | 74.86 | 64.77 | a | 73.10 | 86.90 | a | 97.38 | a | 102.29 | c | 98.43 | a | 95.55 | a | 80.97 | b | 78.63 | 68.36 | c | 82.67 | ||||
2007 | 67.20 | a | 69.11 | 79.77 | 78.73 | 85.53 | a | 94.10 | 100.87 | 101.67 | a | 92.50 | 85.66 | b | 80.07 | 65.76 | b | 83.41 | ||||||||
2008 | 64.20 | a | 69.54 | a | 76.47 | a | 80.73 | 81.17 | a | 98.00 | 100.56 | m | 100.00 | n | 97.00 | r | 93.06 | n | 79.82 | s | 58.27 | t | 78.35 | f | ||
2009 | 71.39 | 65.61 | 72.48 | 77.33 | 89.77 | 84.53 | 100.81 | 98.77 | 98.07 | 81.32 | 76.80 | 63.73 | a | 81.72 | ||||||||||||
2010 | 66.61 | 66.50 | 72.34 | b | 74.29 | b | 79.48 | 90.10 | 97.06 | 98.68 | 95.83 | 77.74 | 71.53 | 66.29 | 79.71 | |||||||||||
2011 | 67.65 | 66.62 | g | 71.26 | 75.03 | 78.71 | 87.67 | 95.23 | 100.74 | 95.73 | 86.42 | 68.70 | 63.19 | 80.94 | a | |||||||||||
2012 | 72.11 | m | 67.00 | 70.32 | 78.07 | 84.03 | 90.83 | 95.52 | 100.26 | 95.47 | 83.03 | 74.77 | 61.94 | 81.93 | a | |||||||||||
2013 | 63.32 | 64.25 | 73.30 | d | 77.00 | 82.48 | 91.10 | 94.58 | 95.03 | 91.63 | 78.77 | 71.07 | 67.29 | 79.15 | ||||||||||||
2014 | 75.00 | 70.68 | 72.48 | 77.40 | 84.48 | 90.43 | 95.61 | 93.42 | 92.77 | 86.68 | 75.00 | 62.45 | 81.37 | |||||||||||||
2015 | 67.26 | 72.82 | 77.19 | 74.80 | 72.76 | b | 90.93 | 87.58 | 94.23 | 89.93 | 82.70 | d | 69.30 | c | 62.61 | 78.51 | ||||||||||
2016 | 61.90 | a | 75.83 | 71.61 | 75.17 | 76.71 | 92.17 | 95.00 | 94.97 | 87.17 | a | 80.50 | a | 74.38 | a | 62.74 | 79.01 | |||||||||
2017 | 58.47 | a | 62.89 | 74.48 | 77.33 | 79.10 | b | 92.33 | 96.84 | 94.71 | 86.57 | 85.42 | 75.20 | 72.39 | 79.64 | |||||||||||
2018 | 71.00 | 66.29 | 67.84 | 76.93 | 77.32 | 90.57 | 98.81 | 96.58 | 93.27 | 80.29 | 74.23 | 65.10 | 79.85 | |||||||||||||
2019 | 64.42 | 56.54 | 66.81 | 76.82 | b | 71.83 | a | 88.70 | 96.77 | 99.19 | 89.93 | 84.06 | 76.30 | 62.23 | 77.80 | |||||||||||
2020 | 67.29 | 69.86 | 64.52 | 72.30 | 85.65 | 88.27 | 96.94 | 99.94 | 97.40 | 88.42 | 75.77 | 68.71 | 81.25 | |||||||||||||
2021 | 67.52 | 69.04 | 67.32 | 78.67 | 83.00 | 95.93 | 99.90 | 97.39 | 93.50 | 79.00 | 81.33 | 62.64 | c | 81.27 | ||||||||||||
2022 | 68.97 | 71.09 | e | 74.53 | a | 78.73 | 83.06 | 94.67 | 97.42 | 100.06 | 94.47 | 83.58 | 69.03 | 63.35 | 81.58 | |||||||||||
2023 | 59.42 | 61.32 | 60.26 | 76.57 | 77.23 | 82.00 | 100.48 | 98.17 | y | ----- | z | ----- | z | ----- | z | ----- | z | 73.90 | e | |||||||
2024 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 67.74 | 67.57 | 71.65 | 76.54 | 82.52 | 91.39 | 97.68 | 97.97 | 93.53 | 83.68 | 74.15 | 66.50 | 81.08 | |||||||||||||
S.D. | 4.44 | 4.67 | 4.71 | 2.72 | 5.72 | 3.95 | 2.97 | 2.89 | 3.27 | 4.11 | 4.07 | 3.65 | 1.68 | |||||||||||||
SKEW | 0.00 | -0.04 | -0.03 | 0.19 | 0.01 | -0.28 | -1.24 | -0.03 | -0.46 | 0.62 | -0.19 | 0.58 | -0.28 | |||||||||||||
MAX | 77.68 | 76.50 | 83.10 | 83.17 | 93.93 | 98.00 | 102.29 | 104.77 | 98.47 | 93.43 | 81.33 | 74.40 | 83.50 | |||||||||||||
MIN | 58.47 | 56.54 | 60.26 | 71.38 | 71.83 | 82.00 | 87.58 | 92.06 | 86.57 | 77.74 | 65.83 | 61.94 | 77.80 | |||||||||||||
YRS | 26 | 26 | 27 | 27 | 28 | 29 | 27 | 26 | 27 | 26 | 27 | 27 | 22 |