YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 60.50 | c | 62.92 | d | 68.48 | 75.92 | e | 87.00 | e | 95.76 | e | 96.77 | e | 95.11 | d | 88.85 | d | 82.75 | c | 65.81 | d | 63.45 | 78.61 | |||
1945 | 62.72 | b | 68.08 | d | 67.56 | d | 77.16 | e | 88.68 | c | 95.61 | g | 98.92 | e | 94.65 | 93.53 | 83.48 | 75.10 | 64.12 | f | 80.99 | b | ||||
1946 | 57.58 | e | 66.67 | d | 71.78 | d | 85.53 | 86.94 | 99.43 | 97.10 | 93.71 | 89.67 | 79.45 | 67.67 | 67.87 | 80.28 | ||||||||||
1947 | 56.61 | 70.86 | 72.10 | 78.67 | 89.39 | 94.50 | 99.29 | 93.45 | 94.60 | 84.32 | 66.07 | 60.55 | 80.03 | |||||||||||||
1948 | 64.87 | 62.97 | 65.52 | 83.50 | 90.94 | 98.20 | 98.03 | 95.71 | 93.43 | 81.87 | 68.14 | a | 63.93 | c | 80.59 | |||||||||||
1949 | 49.66 | b | 63.21 | d | 70.43 | a | 81.36 | b | 88.69 | e | 96.08 | f | 94.32 | f | 95.75 | c | 92.64 | e | 78.77 | e | 79.41 | c | 63.58 | e | 76.35 | b |
1950 | 64.59 | b | 69.69 | b | 74.71 | c | 85.64 | e | 87.79 | c | 97.35 | g | 90.79 | c | 95.93 | b | 90.88 | e | 90.77 | 78.97 | 72.45 | b | 82.02 | a | ||
1951 | 63.79 | b | 68.26 | a | 70.86 | b | 76.43 | 88.60 | a | 95.93 | 99.64 | c | 93.93 | c | 96.58 | f | 83.37 | d | 69.93 | c | 61.62 | e | 79.31 | a | ||
1952 | 63.68 | c | 64.04 | b | 63.19 | 77.33 | 89.89 | c | 96.53 | 97.57 | a | 95.10 | a | 94.67 | 88.77 | 65.83 | 60.45 | 79.76 | ||||||||
1953 | 67.61 | 66.07 | 72.26 | 77.73 | 82.65 | 98.73 | 94.82 | c | 96.58 | 95.93 | 83.50 | a | 73.33 | c | 59.32 | 80.71 | ||||||||||
1954 | 65.19 | 72.14 | 69.52 | b | 85.23 | 88.74 | 97.52 | c | 96.70 | d | 90.08 | e | 94.04 | d | 87.57 | c | 76.66 | a | 67.00 | d | 82.53 | |||||
1955 | 59.11 | d | 63.09 | e | 74.50 | c | 80.64 | e | 86.45 | b | 96.36 | e | 94.77 | a | 90.23 | a | 93.18 | b | 85.79 | b | 72.17 | 68.90 | 80.43 | |||
1956 | 68.00 | a | 63.41 | b | 76.93 | b | 77.59 | c | 92.07 | c | 99.21 | a | 95.59 | b | 93.90 | 95.71 | b | 83.84 | 69.85 | c | 64.00 | a | 81.68 | |||
1957 | 63.14 | c | 73.69 | b | 71.17 | b | 79.29 | b | 84.07 | a | 97.93 | a | 97.54 | c | 93.70 | d | 93.21 | b | 78.23 | e | 66.52 | a | 67.13 | a | 80.47 | |
1958 | 62.83 | a | 66.96 | a | 64.52 | 78.79 | a | 92.84 | 99.22 | c | 96.81 | 93.38 | b | 89.07 | 79.57 | c | 71.34 | a | 70.41 | d | 80.48 | |||||
1959 | 69.13 | a | 66.50 | d | 74.10 | 83.53 | 88.56 | d | 98.69 | a | 97.72 | b | 90.00 | a | 92.43 | b | 83.86 | b | 68.24 | a | 62.07 | d | 81.24 | |||
1960 | 57.60 | a | 62.75 | a | 78.55 | b | 82.68 | b | 89.90 | a | 100.00 | 97.25 | c | 95.80 | a | 93.69 | d | 80.30 | a | 74.03 | 62.73 | a | 81.27 | |||
1961 | 62.72 | b | 68.50 | 74.30 | a | 82.86 | b | 90.24 | b | 98.76 | a | 97.16 | 93.69 | b | 88.93 | b | 81.87 | a | 66.10 | 61.37 | a | 80.54 | ||||
1962 | 59.52 | 68.81 | a | 67.25 | c | 85.55 | a | 87.93 | a | 96.97 | a | 95.68 | 99.16 | 91.93 | 84.23 | 74.72 | a | 63.71 | 81.29 | |||||||
1963 | 61.41 | b | 70.82 | 73.93 | a | 80.93 | 92.23 | a | 95.52 | a | 97.48 | 89.77 | 91.57 | 85.10 | b | 70.73 | 64.97 | 81.21 | ||||||||
1964 | 61.67 | a | 62.97 | 68.03 | a | 77.07 | a | 88.81 | 94.67 | 96.19 | 92.19 | 85.77 | 83.97 | 68.52 | a | 63.94 | 78.65 | |||||||||
1965 | 66.29 | 64.70 | a | 70.00 | 79.52 | a | 86.32 | 93.13 | 96.00 | a | 95.87 | 88.53 | 85.90 | 74.71 | b | 61.35 | 80.20 | |||||||||
1966 | 58.97 | 59.86 | 75.53 | a | 80.45 | a | 89.94 | 95.83 | 97.57 | a | 91.97 | 86.87 | 82.29 | 76.13 | 64.35 | 79.98 | ||||||||||
1967 | 65.71 | 70.04 | 78.16 | 78.90 | 86.58 | 93.67 | 94.58 | 92.42 | 88.93 | 84.32 | 74.17 | 57.81 | 80.44 | |||||||||||||
1968 | 62.87 | 69.41 | 69.23 | a | 76.13 | 87.55 | 97.53 | 93.77 | 89.58 | 90.48 | a | 86.00 | 69.87 | 64.87 | a | 79.78 | ||||||||||
1969 | 66.84 | 65.00 | 69.13 | 82.33 | 89.42 | 96.23 | 96.23 | 96.45 | 92.20 | 81.58 | 67.13 | o | 65.27 | a | 81.88 | a | ||||||||||
1970 | 63.26 | 69.36 | 68.48 | 76.27 | 89.23 | 95.72 | a | 97.42 | 93.06 | ----- | z | 79.58 | 75.40 | 66.58 | 79.49 | a | ||||||||||
1971 | 66.45 | 66.82 | 76.61 | 79.10 | 85.77 | 96.37 | 98.39 | 90.45 | 90.30 | 76.45 | 70.67 | 58.97 | 79.70 | |||||||||||||
1972 | 66.17 | a | 71.25 | a | 81.29 | 83.77 | 88.23 | 94.70 | 98.39 | 94.23 | 89.45 | a | 78.19 | 67.20 | 63.94 | 81.40 | ||||||||||
1973 | 59.90 | 64.61 | 65.35 | 74.90 | 88.13 | 97.00 | 95.84 | 95.71 | 93.43 | 86.23 | 73.40 | 67.35 | 80.15 | |||||||||||||
1974 | 64.39 | 67.82 | 75.26 | 81.90 | a | 91.13 | 101.70 | 93.68 | 92.97 | 88.10 | 79.23 | 71.00 | 60.68 | 80.65 | ||||||||||||
1975 | 64.71 | 66.75 | 71.48 | 75.80 | 85.77 | 96.70 | 95.06 | 96.65 | 89.40 | 84.48 | 73.43 | 64.39 | 80.39 | |||||||||||||
1976 | 64.42 | 70.45 | 72.55 | 78.73 | 87.94 | 97.83 | 92.87 | 94.65 | 88.07 | 77.29 | 69.87 | 63.61 | 79.86 | |||||||||||||
1977 | 60.42 | 69.96 | 69.19 | 80.93 | 85.19 | 97.27 | 95.45 | 94.45 | ----- | z | 82.42 | 75.67 | 68.45 | 79.95 | a | |||||||||||
1978 | 62.90 | b | 64.00 | d | 72.75 | g | 81.76 | i | 86.70 | h | 99.29 | b | 99.12 | g | 93.86 | j | 90.04 | c | 82.84 | 67.33 | 58.00 | c | 74.91 | e | ||
1979 | 55.35 | ----- | z | 70.87 | 80.80 | 85.32 | 95.67 | 98.65 | 95.03 | 94.73 | 87.68 | 69.13 | 66.81 | 81.82 | a | |||||||||||
1980 | 65.29 | 68.34 | 70.19 | 80.77 | 86.35 | 101.33 | 99.48 | b | 95.13 | 93.43 | 81.58 | 71.76 | a | 71.23 | 82.07 | |||||||||||
1981 | 65.52 | 70.18 | 68.97 | 83.37 | 86.26 | 98.57 | 95.42 | 94.53 | a | 92.10 | 80.39 | 77.03 | 70.13 | 81.87 | ||||||||||||
1982 | 65.54 | g | 68.65 | e | 73.62 | e | 82.69 | a | 87.43 | a | 96.57 | 99.00 | c | 93.33 | d | 90.88 | e | 84.21 | c | 69.38 | d | 63.36 | c | 82.65 | a | |
1983 | 63.63 | a | 65.58 | d | 69.85 | d | 72.88 | e | 88.27 | a | 94.61 | b | 97.77 | a | 94.66 | b | 91.04 | c | 79.53 | a | 67.48 | c | 64.08 | e | 79.11 | |
1984 | 62.31 | e | 68.65 | c | 75.11 | d | 78.83 | f | 93.63 | a | 94.82 | b | 95.14 | c | 90.93 | c | 91.70 | c | 75.00 | b | 72.00 | a | 64.78 | d | 80.37 | a |
1985 | 59.15 | e | 64.81 | b | 73.85 | e | 83.76 | e | 88.14 | b | 99.15 | c | 97.50 | a | 95.10 | b | 89.40 | e | 79.59 | b | 70.52 | c | 66.77 | a | 80.64 | |
1986 | 71.69 | b | 70.74 | a | 75.34 | b | 82.23 | d | 89.70 | d | 96.33 | 92.97 | a | 94.93 | b | 87.83 | a | 80.96 | c | 72.26 | c | 62.82 | c | 81.48 | ||
1987 | 62.93 | a | 64.64 | 68.35 | 79.33 | 83.23 | 95.43 | 97.03 | 91.42 | 88.60 | 84.77 | 71.73 | 62.21 | c | 79.14 | |||||||||||
1988 | 63.27 | a | 68.69 | 73.65 | 79.53 | 87.74 | 95.67 | 94.97 | 90.81 | 90.63 | 84.00 | 74.03 | 63.19 | 80.51 | ||||||||||||
1989 | 61.26 | 70.41 | a | 78.19 | 86.53 | 90.42 | 98.03 | 97.10 | 92.19 | 92.20 | 79.48 | 72.43 | 63.81 | 81.84 | ||||||||||||
1990 | 63.13 | 63.04 | a | 72.00 | ----- | z | 86.19 | 100.47 | 91.94 | 89.16 | 88.66 | a | 82.23 | 71.17 | 59.81 | 78.89 | a | |||||||||
1991 | 60.52 | 68.29 | 66.26 | 78.53 | 86.74 | 93.70 | 94.65 | 91.58 | 87.20 | 83.58 | 69.53 | 59.94 | 78.38 | |||||||||||||
1992 | 57.65 | 64.97 | 69.16 | 81.31 | a | 84.16 | 95.30 | 95.10 | 91.19 | 92.43 | 84.97 | 67.10 | 60.39 | 78.64 | ||||||||||||
1993 | 61.45 | 62.57 | 72.90 | 81.07 | 88.81 | 97.40 | 94.58 | 91.45 | 90.27 | 80.23 | 68.90 | 63.58 | 79.43 | |||||||||||||
1994 | 65.48 | 65.36 | 71.90 | 79.87 | 86.61 | 99.80 | 98.97 | 96.84 | 91.07 | 80.61 | 67.13 | 61.77 | 80.45 | |||||||||||||
1995 | 60.87 | 69.25 | 71.81 | 77.93 | 83.29 | 94.23 | 97.97 | 95.55 | 91.80 | 86.42 | 74.70 | 65.81 | 80.80 | |||||||||||||
1996 | 67.55 | 70.21 | 72.65 | ----- | z | 92.87 | 99.07 | 97.29 | 95.10 | 87.13 | 82.00 | 73.10 | 66.52 | 82.13 | a | |||||||||||
1997 | 60.19 | 66.46 | 76.90 | 76.03 | 91.00 | 96.20 | 97.52 | 94.32 | 92.63 | 80.48 | 73.03 | 56.68 | 80.12 | |||||||||||||
1998 | 65.65 | 59.57 | 69.71 | 74.00 | 87.43 | a | 94.80 | 95.70 | a | 94.94 | 94.00 | a | 84.06 | 74.90 | 64.74 | 79.96 | ||||||||||
1999 | 68.47 | a | 71.75 | 76.23 | 77.20 | 88.23 | 94.67 | 91.26 | 92.16 | 90.43 | 85.45 | 78.73 | 63.06 | 81.47 | ||||||||||||
2000 | 69.03 | 70.86 | 72.06 | 83.93 | a | 93.90 | 95.90 | a | 97.39 | 93.84 | 93.93 | 76.77 | 62.12 | e | 67.00 | 81.40 | ||||||||||
2001 | 58.48 | 65.29 | 70.90 | 79.47 | 90.55 | 98.23 | 93.19 | e | 94.00 | a | 92.40 | 84.10 | 74.83 | 61.77 | 80.27 | |||||||||||
2002 | 64.55 | 67.68 | 74.24 | b | 85.10 | a | 90.68 | 102.07 | 95.65 | 95.48 | 92.83 | 80.26 | 74.00 | b | 60.45 | 81.92 | ||||||||||
2003 | 70.00 | 65.39 | 69.97 | 79.60 | 90.13 | a | 97.70 | 100.57 | a | 95.29 | 92.80 | 85.84 | 70.10 | 65.00 | 81.87 | |||||||||||
2004 | 60.90 | 61.61 | a | 75.48 | 76.67 | 89.71 | 96.77 | 96.68 | 93.23 | a | 90.10 | 81.13 | a | 65.70 | 62.19 | 79.18 | ||||||||||
2005 | 63.74 | 62.32 | 69.94 | 80.13 | 90.48 | 98.10 | 101.42 | 92.13 | 93.53 | 83.68 | 75.27 | 67.81 | 81.55 | |||||||||||||
2006 | 67.68 | 71.14 | 71.32 | 83.10 | 92.32 | 99.77 | 97.45 | 89.62 | b | 84.97 | 80.42 | 76.70 | ----- | z | 83.14 | a | ||||||||||
2007 | 58.07 | c | 66.82 | 73.77 | a | 79.55 | a | 89.30 | a | 97.34 | a | 96.37 | a | ----- | z | ----- | z | ----- | z | 74.73 | 60.45 | 77.38 | c | |||
2008 | ----- | z | ----- | z | 73.58 | 80.92 | d | 86.41 | b | 99.11 | b | ----- | z | 91.50 | a | 89.14 | a | 83.87 | a | 74.14 | b | 64.22 | d | 82.54 | c | |
2009 | 66.85 | r | 70.26 | a | 76.81 | d | 79.29 | b | 90.76 | b | ----- | z | ----- | z | ----- | z | ----- | z | 79.96 | g | 75.33 | c | 60.35 | 75.47 | f | |
2010 | 61.55 | 62.29 | 69.19 | 77.63 | 85.90 | 97.67 | 96.68 | 94.77 | ----- | z | ----- | z | 62.38 | v | 70.55 | 79.58 | c | |||||||||
2011 | 64.29 | 65.04 | a | 77.97 | a | 83.40 | 87.52 | 101.73 | 97.90 | 97.00 | 93.67 | 86.48 | 70.10 | 59.58 | 82.06 | |||||||||||
2012 | 68.45 | 67.79 | 75.19 | 83.93 | 92.65 | 100.96 | b | 95.57 | h | 96.42 | 89.96 | b | 88.21 | q | ----- | z | 66.31 | b | 82.41 | c | ||||||
2013 | 60.13 | a | 66.20 | r | ----- | z | ----- | z | ----- | z | 101.53 | o | 94.90 | 93.96 | e | 91.64 | b | 82.14 | b | 72.46 | b | 64.93 | d | 80.02 | e | |
2014 | 68.69 | e | 73.88 | d | 76.21 | g | 79.61 | l | 93.35 | k | 101.15 | j | 96.73 | e | 94.90 | 92.03 | 87.32 | 77.60 | 70.84 | 82.75 | d | |||||
2015 | 71.06 | 78.46 | b | 79.27 | a | ----- | z | 82.26 | 99.87 | 95.84 | f | 97.43 | a | 90.50 | d | 84.80 | f | 70.78 | c | 63.00 | e | 81.40 | c | |||
2016 | 61.86 | b | 73.62 | 78.39 | 79.70 | 87.03 | 99.50 | 98.00 | 92.68 | 88.63 | 88.10 | 73.66 | a | 65.35 | 82.21 | |||||||||||
2017 | 62.23 | 70.64 | 80.52 | 83.80 | 88.13 | 102.20 | 95.68 | 94.48 | 93.00 | 89.10 | 80.67 | 66.55 | 83.92 | |||||||||||||
2018 | 69.53 | a | 70.15 | b | 75.24 | f | 87.28 | a | 93.20 | a | 101.60 | 97.97 | a | 95.48 | 93.97 | 77.97 | 71.57 | 63.90 | a | 83.87 | a | |||||
2019 | 63.13 | a | 61.78 | a | 72.79 | g | 81.86 | b | 84.22 | d | 98.86 | a | 101.81 | 100.26 | 91.83 | a | 83.71 | 72.54 | b | 64.19 | 82.20 | a | ||||
2020 | 66.07 | b | 67.36 | a | 72.40 | f | 86.94 | n | 96.08 | s | 102.74 | k | 99.96 | f | 104.24 | f | 95.75 | f | 91.78 | d | 77.96 | e | 65.33 | m | 75.79 | h |
2021 | 63.48 | j | 69.86 | f | 73.08 | e | 83.64 | b | 91.55 | 101.63 | 96.61 | 94.81 | 91.57 | 83.84 | 78.73 | 70.19 | 86.57 | b | ||||||||
2022 | 66.75 | c | 67.00 | a | 76.68 | c | 86.10 | 94.74 | 99.16 | e | 98.57 | a | 93.46 | c | 92.11 | c | 81.00 | b | 71.56 | e | 65.73 | e | 82.74 | |||
2023 | 64.34 | b | 65.29 | u | 71.59 | b | 84.81 | d | 89.23 | 96.76 | e | 105.87 | 100.52 | 96.45 | j | 88.04 | d | 77.40 | e | 70.89 | d | 84.94 | b | |||
2024 | 63.75 | g | 70.55 | 70.52 | j | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 70.55 | k | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 63.38 | 67.30 | 72.42 | 80.55 | 88.50 | 97.58 | 96.72 | 93.97 | 91.20 | 82.95 | 72.10 | 64.26 | 80.67 | |||||||||||||
S.D. | 3.90 | 3.60 | 3.85 | 3.26 | 2.73 | 2.26 | 2.38 | 2.37 | 2.38 | 3.38 | 3.87 | 3.45 | 1.14 | |||||||||||||
SKEW | -0.43 | 0.17 | 0.03 | -0.04 | -0.02 | 0.21 | 0.45 | 0.14 | -0.34 | 0.14 | -0.05 | 0.26 | 0.21 | |||||||||||||
MAX | 71.69 | 78.46 | 81.29 | 87.28 | 94.74 | 102.20 | 105.87 | 100.52 | 95.93 | 91.78 | 80.67 | 72.45 | 83.92 | |||||||||||||
MIN | 49.66 | 59.57 | 63.19 | 72.88 | 82.26 | 93.13 | 90.79 | 89.16 | 84.97 | 75.00 | 62.12 | 56.68 | 78.38 | |||||||||||||
YRS | 76 | 76 | 74 | 72 | 76 | 73 | 73 | 76 | 72 | 75 | 77 | 77 | 53 |