YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 58.30 | a | 61.43 | 71.13 | 75.50 | b | 89.30 | a | 98.59 | a | 100.32 | 96.81 | 92.47 | 85.87 | 73.70 | 72.26 | 81.31 | |||||||||
1930 | 54.58 | 71.82 | 69.61 | 81.70 | 77.77 | 93.19 | c | 96.90 | 94.27 | a | 88.47 | 78.29 | 69.00 | 63.48 | 78.26 | |||||||||||
1931 | 63.03 | 62.21 | 71.23 | 77.83 | a | 84.29 | 91.48 | a | 100.13 | a | 93.61 | 87.54 | d | 80.58 | 62.37 | 56.74 | 77.59 | |||||||||
1932 | 54.03 | 58.41 | 69.84 | 75.70 | 81.55 | 89.20 | 94.94 | 94.68 | 94.00 | 79.30 | a | 76.23 | 56.52 | 77.03 | ||||||||||||
1933 | 56.48 | 57.25 | 71.13 | 71.63 | 75.90 | 92.87 | 99.39 | 97.61 | 93.33 | 86.29 | 76.30 | 64.42 | 78.55 | |||||||||||||
1934 | 65.42 | 68.50 | 79.35 | 82.24 | a | 90.19 | 88.10 | a | 99.13 | 93.90 | 90.70 | 83.97 | 71.27 | 63.26 | 81.34 | |||||||||||
1935 | 60.19 | 64.36 | 64.39 | 74.33 | 76.19 | 94.27 | 96.97 | 92.77 | 89.77 | 79.87 | 66.07 | 62.23 | 76.78 | |||||||||||||
1936 | 62.61 | 58.90 | 71.43 | a | 78.27 | 87.90 | 95.43 | 97.32 | 94.16 | 89.10 | a | 79.90 | 70.70 | 59.00 | 78.73 | |||||||||||
1937 | 44.65 | 60.37 | a | 64.42 | 75.20 | 85.30 | a | 91.61 | b | 97.52 | 99.26 | 94.60 | 85.84 | 74.34 | a | 64.81 | 78.16 | |||||||||
1938 | 64.74 | 58.96 | 62.97 | 76.00 | 81.81 | 93.70 | 97.68 | 97.71 | 95.43 | 81.45 | 68.10 | 64.87 | 78.62 | |||||||||||||
1939 | 60.77 | 53.69 | b | 70.63 | a | 80.07 | 87.87 | 96.43 | 99.87 | a | 98.87 | 87.26 | c | 80.45 | b | 71.90 | 68.93 | a | 79.73 | |||||||
1940 | 64.74 | 63.62 | 73.65 | 77.10 | 90.30 | a | 99.55 | a | 100.45 | 99.26 | 87.80 | 82.03 | 67.87 | 64.35 | 80.89 | |||||||||||
1941 | 58.81 | 63.07 | 65.83 | b | 66.60 | 85.57 | a | 89.80 | 97.35 | 93.32 | 88.77 | 73.65 | 73.83 | 61.87 | 76.54 | |||||||||||
1942 | 63.77 | 60.71 | 66.36 | c | 74.00 | 83.74 | 95.59 | a | 102.29 | 99.50 | a | 98.69 | a | 78.90 | 75.37 | 67.00 | 80.49 | |||||||||
1943 | 62.48 | 67.89 | 69.81 | 77.69 | a | 86.81 | 91.23 | 101.06 | 94.52 | 95.20 | 82.10 | 73.87 | 61.19 | 80.32 | ||||||||||||
1944 | 60.32 | 57.14 | 65.42 | 70.23 | 82.13 | a | 88.63 | 99.40 | a | 101.13 | 93.27 | 83.42 | 64.30 | 64.39 | 77.48 | |||||||||||
1945 | 60.90 | 62.89 | 61.87 | 73.62 | d | 85.07 | a | 93.92 | d | 100.00 | b | 96.35 | 92.71 | i | 82.73 | i | ----- | z | ----- | z | 79.33 | d | ||||
1946 | ----- | z | 71.52 | a | ----- | z | 82.39 | g | 85.41 | d | 97.41 | a | 98.17 | a | 98.81 | e | 93.92 | f | 73.25 | w | 64.21 | b | 63.41 | d | 82.71 | e |
1947 | 60.23 | a | 68.96 | d | 71.55 | b | 76.39 | b | 87.83 | a | 91.10 | a | 99.60 | a | 92.97 | a | 93.83 | 81.39 | 62.67 | c | 57.62 | b | 78.68 | |||
1948 | 63.68 | 59.45 | 61.29 | 76.90 | a | 84.93 | b | 92.62 | a | 98.03 | b | 95.59 | b | 96.04 | f | 81.00 | c | 65.57 | i | 59.52 | h | 79.28 | c | |||
1949 | 43.00 | 54.77 | b | 66.04 | d | 78.85 | d | 82.87 | 91.45 | a | 95.06 | 94.42 | 91.57 | 75.27 | a | 76.14 | b | 56.76 | b | 75.52 | ||||||
1950 | 53.58 | 63.50 | 67.24 | f | 78.17 | a | 80.48 | 90.27 | 92.32 | 93.45 | b | 87.54 | b | 85.42 | 72.53 | 67.87 | a | 78.65 | a | |||||||
1951 | 58.06 | 59.46 | 64.87 | 69.23 | 79.68 | 88.45 | a | 96.93 | d | 89.89 | d | 90.07 | a | 76.90 | 64.03 | 53.26 | 74.24 | |||||||||
1952 | 52.04 | c | 58.52 | 55.42 | 71.00 | 87.65 | 89.10 | a | 94.65 | 95.16 | 91.73 | 86.00 | 61.47 | 56.04 | c | 74.90 | ||||||||||
1953 | 63.71 | 61.39 | 67.77 | 72.13 | 76.61 | c | 91.97 | 95.33 | a | 93.45 | 93.14 | a | 78.45 | 69.97 | 58.46 | c | 76.87 | |||||||||
1954 | 58.26 | 69.61 | 62.86 | c | 77.77 | 84.73 | a | 90.53 | 95.60 | a | 91.40 | a | 89.87 | 81.71 | 70.73 | 59.84 | 77.74 | |||||||||
1955 | 51.13 | a | 56.68 | 67.00 | 71.28 | a | 81.52 | 90.60 | 91.58 | 89.74 | 90.13 | 83.19 | 65.75 | b | 61.03 | 74.97 | ||||||||||
1956 | 61.58 | 55.93 | 71.10 | a | 72.25 | b | 83.81 | 93.80 | 94.10 | a | 92.60 | a | 93.83 | 77.42 | 68.23 | 62.03 | b | 77.22 | ||||||||
1957 | 52.33 | a | 64.82 | 65.16 | 70.66 | a | 76.39 | 93.50 | 96.32 | 91.97 | a | 90.17 | 71.33 | a | 59.07 | 62.62 | b | 74.53 | ||||||||
1958 | 59.00 | 61.93 | 57.07 | a | 70.90 | 87.03 | 91.77 | 97.32 | 94.77 | 87.50 | 79.97 | 65.77 | 67.32 | 76.70 | ||||||||||||
1959 | 60.65 | 55.89 | 69.35 | 78.23 | 79.81 | 94.93 | 98.52 | b | 90.67 | a | 86.50 | 81.14 | c | 69.32 | h | 60.81 | d | 77.86 | a | |||||||
1960 | 51.90 | 55.00 | 69.38 | b | 76.00 | 83.16 | 95.57 | 98.03 | 95.80 | a | 90.73 | 74.90 | 66.10 | 56.17 | g | 77.87 | a | |||||||||
1961 | 63.13 | a | 63.50 | 66.06 | 75.63 | 81.87 | 95.53 | 96.97 | a | 93.39 | 85.27 | 77.58 | 62.28 | e | 56.42 | 76.47 | ||||||||||
1962 | 57.87 | a | 57.46 | 59.60 | a | 80.17 | 79.00 | 91.23 | 95.81 | 97.32 | 89.66 | a | 78.71 | 71.00 | a | 61.97 | a | 76.65 | ||||||||
1963 | 55.90 | 68.14 | 64.77 | 70.00 | 85.03 | 87.23 | 97.77 | a | 91.32 | 89.37 | 79.65 | 66.00 | 62.42 | 76.47 | ||||||||||||
1964 | 55.87 | 58.28 | 61.42 | 70.69 | a | 79.90 | a | 89.23 | 96.00 | 91.20 | a | 87.10 | a | 83.71 | 62.07 | 57.50 | a | 74.41 | ||||||||
1965 | 59.86 | b | 60.71 | 61.19 | 66.97 | 77.71 | 85.79 | a | 94.52 | 94.17 | a | 83.40 | 84.37 | a | 66.53 | 56.84 | 74.34 | |||||||||
1966 | 54.80 | a | 55.29 | 68.65 | 77.30 | 85.65 | 90.67 | 93.84 | 92.16 | 87.00 | a | 76.90 | 67.04 | e | 59.10 | 75.70 | ||||||||||
1967 | 60.71 | 65.75 | 67.34 | b | 65.82 | b | 81.40 | a | 87.59 | a | 95.03 | 93.93 | b | 86.60 | 83.60 | a | 71.66 | a | 52.50 | a | 75.99 | |||||
1968 | 59.19 | 65.41 | 66.43 | a | 71.10 | 81.58 | e | 92.00 | 92.30 | a | 88.39 | 89.30 | 79.81 | 66.97 | 57.42 | 75.82 | ||||||||||
1969 | 58.84 | 55.71 | 63.32 | 74.07 | 84.19 | 88.10 | 95.16 | 96.23 | 90.23 | 75.20 | a | 66.83 | 61.70 | a | 75.80 | |||||||||||
1970 | 58.48 | 65.07 | 63.57 | a | 68.73 | 84.19 | 92.07 | a | 96.84 | 93.68 | 86.33 | 75.74 | 68.97 | 57.06 | 75.90 | |||||||||||
1971 | 60.80 | a | 62.25 | 70.06 | 72.23 | 76.62 | b | 90.10 | a | 99.29 | 91.23 | 88.37 | 71.58 | 65.93 | 52.42 | 75.07 | ||||||||||
1972 | 59.94 | 66.93 | 76.87 | 76.03 | 82.19 | 90.53 | 97.58 | 91.32 | 87.07 | a | 70.94 | 61.40 | 55.19 | 76.33 | ||||||||||||
1973 | 53.71 | 56.96 | 55.26 | 69.63 | 83.90 | 92.20 | 95.58 | 93.52 | 88.70 | 81.24 | b | 65.80 | 62.48 | 74.92 | ||||||||||||
1974 | 56.26 | 62.44 | a | 66.94 | 74.43 | 83.61 | 96.80 | 93.16 | 92.90 | 89.11 | b | 77.55 | 67.90 | 56.23 | 76.44 | |||||||||||
1975 | 59.81 | 59.71 | 61.19 | 64.86 | a | 80.03 | a | 90.30 | 94.61 | 94.10 | b | 89.79 | a | 78.81 | 68.67 | c | 62.06 | 75.33 | ||||||||
1976 | 63.61 | 62.28 | 63.65 | 70.73 | 83.00 | 91.20 | 92.87 | 92.54 | g | 83.77 | 76.42 | 71.53 | 63.06 | 74.74 | a | |||||||||||
1977 | 57.77 | 67.57 | 62.81 | 76.17 | 74.32 | 92.83 | 94.77 | 93.29 | 88.23 | 81.42 | 72.27 | 63.52 | 77.08 | |||||||||||||
1978 | 56.90 | 59.68 | 67.03 | 70.13 | 81.58 | 93.37 | 96.45 | 93.55 | ----- | z | ----- | z | ----- | z | ----- | z | 77.34 | d | ||||||||
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 | 58.27 | b | 62.40 | a | 78.69 | d | 80.11 | d | 92.32 | b | 92.24 | b | 91.63 | a | 87.23 | 78.87 | a | 62.27 | 52.81 | 76.08 | a | |||
1988 | 55.87 | 63.41 | 66.77 | a | 71.77 | 80.83 | a | 92.03 | a | 96.06 | 90.29 | 85.77 | 82.81 | 65.14 | a | 57.06 | 75.65 | |||||||||
1989 | 56.74 | 60.54 | b | 70.97 | 80.14 | a | 81.53 | a | 90.04 | b | 94.90 | 90.56 | m | 91.27 | 79.13 | 72.17 | 63.58 | 76.45 | a | |||||||
1990 | 57.32 | 57.74 | a | 67.42 | 75.07 | 81.52 | 95.43 | 95.32 | 92.61 | 89.50 | 81.61 | 70.23 | 55.87 | 76.64 | ||||||||||||
1991 | 57.84 | 69.86 | 56.35 | 72.70 | 79.48 | 86.86 | b | 96.96 | d | 95.87 | a | 88.77 | 83.23 | 66.46 | b | 58.67 | a | 76.09 | ||||||||
1992 | 58.16 | 61.79 | 62.39 | 77.13 | 83.81 | 90.80 | 93.81 | 93.58 | 90.67 | 81.71 | 63.97 | a | 52.94 | 75.90 | ||||||||||||
1993 | 55.00 | 55.75 | 66.87 | a | 75.43 | 84.90 | 90.97 | 94.29 | 94.94 | 91.00 | 78.55 | 65.60 | 61.48 | 76.23 | ||||||||||||
1994 | 62.74 | 58.11 | 71.48 | f | 75.29 | b | 81.19 | 96.73 | 98.03 | a | 98.85 | e | 91.60 | 76.63 | a | 60.93 | b | 57.58 | 77.97 | a | ||||||
1995 | 53.90 | 68.16 | c | 64.07 | a | 68.80 | 75.81 | 90.57 | b | 97.79 | c | 97.50 | a | 92.73 | 83.45 | 73.50 | b | 63.10 | 77.45 | |||||||
1996 | ----- | z | 64.21 | a | 69.77 | a | 78.90 | 86.48 | 96.78 | c | 99.55 | 98.39 | 86.31 | a | 77.77 | 67.11 | b | 60.00 | 80.48 | a | ||||||
1997 | 55.71 | 60.52 | a | 73.70 | a | 71.00 | b | 88.87 | 90.52 | a | 97.06 | 96.33 | a | 91.30 | 77.50 | a | 67.11 | b | 56.03 | a | 77.14 | |||||
1998 | 59.61 | 53.39 | 63.55 | 68.72 | a | 77.93 | a | 88.21 | a | 99.00 | 98.10 | a | 87.86 | a | 77.65 | 67.73 | 60.29 | 75.17 | ||||||||
1999 | 64.77 | a | 66.33 | a | 67.48 | 68.68 | b | 82.90 | a | 91.67 | 93.43 | a | 94.30 | a | 89.80 | 84.97 | 74.80 | 60.54 | c | 78.31 | ||||||
2000 | 63.00 | 64.72 | 66.03 | a | 80.88 | d | 89.23 | 95.17 | 98.03 | 95.06 | 90.27 | 72.84 | 60.07 | 63.77 | 78.26 | |||||||||||
2001 | 53.90 | 59.32 | c | 66.79 | c | 71.73 | 90.93 | a | 95.27 | 96.27 | a | 96.70 | a | 94.14 | a | 82.47 | a | 67.67 | 55.97 | a | 77.60 | |||||
2002 | 58.50 | a | 66.93 | 67.23 | 77.00 | a | 84.45 | 94.38 | d | 95.07 | a | 93.75 | c | 87.25 | b | 72.43 | a | 66.97 | 53.77 | 76.48 | ||||||
2003 | 65.55 | b | 56.19 | b | 62.65 | 68.17 | a | 81.77 | a | 90.87 | 97.58 | 91.34 | b | 89.70 | 83.50 | e | 60.03 | 55.97 | a | 75.28 | ||||||
2004 | 57.71 | 54.50 | a | 73.61 | 72.75 | b | 82.87 | a | 90.07 | b | 94.52 | b | 91.00 | b | 85.79 | a | 71.83 | b | 60.20 | 56.81 | 74.30 | |||||
2005 | 54.61 | 55.93 | a | 62.07 | b | 72.86 | b | 85.09 | i | 92.08 | f | 98.75 | c | 91.07 | b | 88.41 | a | 77.30 | d | 70.10 | a | 60.14 | b | 73.12 | b | |
2006 | 60.71 | c | 65.70 | a | 62.26 | d | 73.52 | c | 86.03 | b | 95.73 | d | 95.97 | 92.90 | a | 85.50 | 75.50 | a | 69.07 | 59.63 | d | 76.88 | ||||
2007 | 56.76 | b | 59.85 | b | 69.32 | 73.61 | b | 83.84 | 94.04 | c | 95.07 | a | 93.70 | a | 86.80 | 77.35 | 70.68 | b | 52.45 | 76.12 | ||||||
2008 | 51.61 | 58.07 | 66.97 | b | 73.67 | 77.33 | a | 92.90 | 94.23 | 92.23 | 87.70 | 79.10 | 68.97 | a | 54.04 | c | 74.73 | |||||||||
2009 | 60.90 | a | 58.39 | 65.94 | 70.10 | 85.55 | 85.50 | 96.39 | 93.68 | 89.50 | 73.16 | 69.13 | 51.72 | b | 75.00 | |||||||||||
2010 | 56.55 | 55.64 | 61.45 | 67.79 | a | 75.55 | 89.87 | 95.23 | 90.36 | c | 91.10 | 75.26 | 63.80 | 59.52 | 73.51 | |||||||||||
2011 | 58.03 | 55.04 | b | 65.71 | 71.67 | 75.65 | 89.97 | 94.27 | a | 96.55 | 89.70 | 79.39 | 62.40 | 55.03 | 74.45 | |||||||||||
2012 | 60.97 | 60.14 | 64.00 | 74.17 | 84.48 | 93.83 | 92.39 | 93.55 | 88.10 | 79.45 | 71.17 | 55.74 | 76.50 | |||||||||||||
2013 | 54.55 | 55.54 | 69.29 | 74.37 | 82.03 | a | 95.07 | 93.58 | 91.77 | 85.43 | 74.83 | a | 65.90 | 57.68 | 75.00 | |||||||||||
2014 | 64.13 | 63.75 | 67.93 | a | 73.30 | 80.94 | 92.30 | 94.06 | 89.16 | 88.93 | o | 78.80 | u | 67.04 | d | 56.71 | c | 74.93 | b | |||||||
2015 | 60.97 | 67.46 | b | 69.97 | a | 73.80 | 76.03 | 93.05 | h | 90.94 | 94.61 | 88.67 | 76.94 | 60.77 | 54.61 | 74.07 | a | |||||||||
2016 | 55.29 | 66.72 | 69.77 | 71.70 | 76.94 | 95.70 | 96.10 | 90.58 | 84.60 | 80.34 | b | 67.60 | 56.41 | b | 75.98 | |||||||||||
2017 | 51.10 | 59.25 | 69.94 | 73.70 | 80.77 | 95.60 | 94.52 | 92.73 | a | 85.17 | 81.53 | a | 71.53 | 64.62 | b | 76.70 | ||||||||||
2018 | 63.63 | a | 58.36 | 63.94 | 77.67 | 82.03 | a | 92.73 | 94.93 | a | 94.48 | 91.28 | a | 73.61 | 65.96 | e | 59.08 | f | 78.06 | a | ||||||
2019 | 55.00 | d | 48.88 | b | 63.13 | 74.72 | a | 73.55 | 90.14 | a | 95.70 | d | 97.21 | g | 88.54 | d | 75.83 | a | 68.30 | c | 55.00 | b | 71.71 | a | ||
2020 | 58.47 | a | 60.86 | a | 59.97 | b | 71.79 | b | 86.73 | a | 92.44 | c | 97.86 | c | 100.56 | f | 92.23 | d | 82.88 | e | 69.29 | b | 59.39 | 75.63 | a | |
2021 | 56.90 | 60.43 | 61.83 | a | 76.45 | a | 84.23 | e | 96.84 | e | 94.48 | b | 93.60 | a | 88.31 | a | 73.27 | a | 72.41 | c | 58.97 | a | 76.48 | |||
2022 | 58.58 | 60.93 | 67.69 | e | 76.00 | a | 84.48 | 93.64 | b | 94.67 | a | 90.32 | 88.75 | b | 76.48 | 59.67 | 55.52 | 75.56 | ||||||||
2023 | 50.84 | 56.21 | 56.19 | 73.10 | a | 81.03 | 88.03 | 101.61 | 95.04 | e | 88.17 | 81.43 | a | 68.53 | 61.63 | a | 75.15 | |||||||||
2024 | 56.13 | 58.32 | a | 61.45 | 74.96 | c | 78.50 | s | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.72 | h | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 58.12 | 60.99 | 66.01 | 73.84 | 82.46 | 92.19 | 96.34 | 94.06 | 89.40 | 79.15 | 67.70 | 59.46 | 76.64 | |||||||||||||
S.D. | 4.36 | 4.68 | 4.59 | 3.77 | 3.99 | 2.95 | 2.41 | 2.70 | 2.86 | 3.82 | 4.32 | 4.28 | 1.75 | |||||||||||||
SKEW | -0.73 | 0.25 | 0.00 | -0.05 | -0.13 | 0.10 | 0.18 | 0.39 | 0.50 | -0.20 | -0.02 | 0.38 | 0.87 | |||||||||||||
MAX | 65.55 | 71.82 | 79.35 | 82.24 | 90.93 | 99.55 | 102.29 | 101.13 | 98.69 | 86.29 | 76.30 | 72.26 | 81.34 | |||||||||||||
MIN | 43.00 | 48.88 | 55.26 | 64.86 | 73.55 | 85.50 | 90.94 | 88.39 | 83.40 | 70.94 | 59.07 | 51.72 | 73.51 | |||||||||||||
YRS | 85 | 88 | 85 | 87 | 86 | 85 | 87 | 83 | 82 | 83 | 83 | 82 | 69 |