YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1917 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 81.60 | 85.00 | 80.47 | 77.87 | 71.52 | 58.20 | 56.06 | 72.96 | e | |||||||
1918 | 53.02 | 53.86 | 57.45 | 64.90 | 64.94 | 82.40 | 80.77 | 78.47 | 75.32 | ----- | z | 52.23 | 49.97 | 64.85 | 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 | 74.93 | d | 72.32 | b | 77.83 | h | 82.29 | g | 80.28 | c | 67.87 | a | 60.83 | a | 51.97 | 68.03 | f | |
1998 | 53.55 | 50.91 | 57.09 | b | 59.30 | c | 61.32 | c | 69.25 | 81.77 | 84.97 | 72.72 | a | 65.44 | 58.07 | 51.93 | a | 63.86 | ||||||||
1999 | 53.94 | 53.57 | 55.35 | 56.93 | c | 65.66 | 71.52 | a | 78.05 | b | 78.13 | 73.25 | 71.28 | a | 60.40 | 53.12 | b | 64.27 | ||||||||
2000 | 55.59 | d | 53.00 | b | 55.57 | a | 63.25 | 69.87 | 74.55 | 76.24 | 78.23 | 76.10 | a | 65.02 | 55.75 | 57.28 | a | 65.04 | ||||||||
2001 | 50.76 | b | 51.96 | 58.67 | a | 58.62 | a | 72.72 | a | 76.09 | a | 76.43 | a | 80.24 | 76.72 | 70.10 | a | 58.58 | 50.66 | 65.13 | ||||||
2002 | 52.47 | a | 56.16 | 55.53 | 61.00 | b | 64.81 | 71.97 | 77.58 | a | 75.79 | 76.22 | 62.33 | b | 60.10 | 50.60 | a | 63.71 | ||||||||
2003 | 58.74 | 52.78 | a | 57.23 | a | 56.07 | a | 66.74 | 70.67 | 80.87 | 81.00 | a | 77.82 | 71.52 | 54.43 | 51.34 | 64.93 | |||||||||
2004 | 52.98 | 50.57 | a | 64.18 | a | 62.68 | b | 68.72 | a | 71.27 | 78.29 | 76.87 | a | 74.57 | 63.82 | 52.83 | 52.10 | 64.07 | ||||||||
2005 | 51.62 | a | 52.43 | 56.60 | 59.72 | 67.63 | 70.43 | a | 80.97 | 79.68 | 71.09 | a | 65.21 | b | 59.83 | a | 54.48 | 64.14 | ||||||||
2006 | 53.62 | a | 56.25 | 51.00 | a | 58.48 | 68.66 | b | 78.40 | a | 84.25 | c | 77.75 | a | 75.41 | b | 63.90 | b | 61.37 | 52.30 | c | 65.11 | ||||
2007 | 51.33 | a | 54.91 | 61.35 | 62.20 | 66.60 | a | 72.68 | 80.08 | 82.33 | a | 74.25 | 67.34 | b | 63.00 | 51.17 | b | 65.61 | ||||||||
2008 | 52.13 | a | 55.71 | a | 60.03 | a | 63.47 | 65.50 | a | 76.83 | 80.14 | m | 80.38 | n | 77.79 | r | 73.50 | n | 62.36 | s | 48.41 | t | 62.28 | f | ||
2009 | 56.24 | 52.91 | 57.98 | 61.48 | 71.60 | 69.72 | 80.92 | 79.47 | 79.52 | 65.58 | 60.55 | 51.45 | a | 65.62 | ||||||||||||
2010 | 53.56 | 54.32 | 57.81 | b | 59.39 | b | 63.55 | 72.23 | 79.60 | 80.06 | 77.47 | 66.21 | 57.40 | 54.98 | 64.72 | |||||||||||
2011 | 54.48 | 51.67 | g | 57.66 | 61.63 | 63.82 | 70.67 | 78.05 | 81.05 | 78.32 | 70.06 | 55.70 | 49.85 | 65.57 | a | |||||||||||
2012 | 54.44 | m | 53.09 | 55.18 | 63.12 | 68.95 | 72.93 | 78.15 | 84.19 | 81.42 | 69.98 | 62.87 | 53.23 | 67.55 | a | |||||||||||
2013 | 52.66 | 52.62 | 60.81 | d | 63.18 | 68.39 | 74.53 | 80.39 | 80.08 | 77.85 | 65.87 | 61.10 | 56.61 | 66.18 | ||||||||||||
2014 | 62.85 | 59.21 | 60.74 | 64.03 | 70.37 | 73.90 | 80.50 | 78.81 | 79.02 | 73.42 | 63.93 | 54.60 | a | 68.45 | ||||||||||||
2015 | 58.24 | 61.98 | 65.05 | 62.63 | 62.88 | c | 77.07 | 75.18 | 80.56 | 78.10 | 72.07 | d | 58.81 | c | 53.29 | 67.16 | ||||||||||
2016 | 53.37 | a | 63.74 | 60.45 | 63.45 | 64.65 | 77.62 | 80.32 | 80.29 | 74.10 | a | 69.35 | a | 64.22 | a | 54.31 | 67.16 | |||||||||
2017 | 50.98 | a | 54.89 | 62.77 | 64.18 | 66.71 | b | 77.10 | 82.03 | 81.00 | 74.72 | 72.50 | 64.77 | 61.02 | 67.72 | |||||||||||
2018 | 60.76 | 56.11 | 57.76 | 63.83 | 65.13 | 74.17 | 84.00 | 81.39 | 78.23 | 68.76 | 62.63 | 55.82 | 67.38 | |||||||||||||
2019 | 55.00 | 48.02 | 56.63 | 64.27 | b | 60.63 | a | 73.13 | 80.84 | 82.81 | 76.68 | 69.76 | 63.87 | 53.73 | 65.45 | |||||||||||
2020 | 56.11 | 57.72 | 54.53 | 62.00 | 71.08 | 73.13 | 80.08 | 84.19 | 82.43 | 74.66 | 63.17 | 57.34 | 68.04 | |||||||||||||
2021 | 56.81 | 56.95 | 55.23 | 64.53 | 67.66 | 78.75 | 84.03 | 82.39 | 78.82 | 66.37 | 67.87 | 53.54 | c | 67.74 | ||||||||||||
2022 | 58.53 | 57.20 | e | 61.93 | a | 65.07 | 68.26 | 78.63 | 81.40 | 84.87 | 81.05 | 70.68 | 57.65 | 54.37 | 68.30 | |||||||||||
2023 | 50.90 | 51.07 | 51.42 | 63.10 | 64.56 | 68.12 | 84.42 | 82.42 | y | ----- | z | ----- | z | ----- | z | ----- | z | 61.94 | e | |||||||
2024 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 54.63 | 54.69 | 58.00 | 61.95 | 67.01 | 74.20 | 80.38 | 80.58 | 77.01 | 68.49 | 60.01 | 53.60 | 65.90 | |||||||||||||
S.D. | 3.15 | 3.49 | 3.44 | 2.46 | 3.37 | 3.66 | 2.59 | 2.39 | 2.76 | 3.30 | 3.79 | 2.61 | 1.57 | |||||||||||||
SKEW | 0.93 | 0.73 | 0.09 | -0.86 | 0.28 | 0.50 | -0.03 | 0.16 | -0.08 | -0.04 | -0.23 | 0.80 | 0.26 | |||||||||||||
MAX | 62.85 | 63.74 | 65.05 | 65.07 | 74.93 | 82.40 | 85.00 | 84.97 | 82.43 | 74.66 | 67.87 | 61.02 | 68.45 | |||||||||||||
MIN | 50.76 | 48.02 | 51.00 | 56.07 | 60.63 | 68.12 | 75.18 | 75.79 | 71.09 | 62.33 | 52.23 | 49.85 | 63.71 | |||||||||||||
YRS | 26 | 26 | 27 | 27 | 28 | 29 | 27 | 26 | 27 | 26 | 27 | 27 | 22 |