YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1923 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 96.16 | 89.81 | 79.53 | 67.29 | ----- | z | ----- | z | 83.20 | h | ||||
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 | 90.90 | u | 89.61 | 86.13 | 69.32 | 54.27 | 52.87 | 70.44 | g | |||||
1958 | 49.77 | 59.21 | 57.03 | 71.40 | 84.55 | 94.30 | 95.12 | f | 95.03 | 83.79 | a | 73.19 | 62.33 | c | 58.54 | g | 73.06 | b | ||||||||
1959 | 46.87 | 54.93 | 63.84 | 73.13 | 81.16 | 91.80 | 93.20 | a | 88.90 | 86.08 | d | 74.29 | 59.07 | a | 50.27 | a | 71.96 | |||||||||
1960 | 45.63 | a | 52.28 | 67.03 | a | 74.63 | 80.03 | a | 91.24 | e | 91.06 | 91.61 | 85.30 | 70.03 | a | 61.23 | 43.52 | 71.13 | ||||||||
1961 | 48.43 | a | 58.54 | 64.67 | a | 72.47 | 82.47 | a | 90.17 | 91.13 | 88.03 | a | 81.17 | 73.72 | b | 55.04 | b | ----- | z | 73.26 | a | |||||
1962 | 47.32 | 60.07 | 58.90 | 75.57 | 82.23 | a | 89.83 | 90.26 | 93.93 | a | 83.17 | a | 72.94 | 62.33 | c | 51.93 | b | 72.37 | ||||||||
1963 | 46.97 | b | 56.61 | 64.61 | 75.07 | 83.19 | 88.34 | a | 93.90 | 88.86 | c | 84.41 | a | 75.46 | e | 59.27 | d | 50.94 | 72.30 | |||||||
1964 | 48.23 | 44.15 | b | 59.39 | 68.80 | 80.73 | a | 88.31 | a | 91.58 | 88.90 | 81.45 | a | 75.45 | b | 59.80 | 50.16 | 69.75 | ||||||||
1965 | 53.10 | 54.96 | 61.00 | c | 71.00 | 77.33 | d | 84.70 | c | 90.59 | b | 87.70 | a | 80.23 | d | 75.00 | b | 63.00 | 49.26 | 70.66 | ||||||
1966 | 46.48 | 49.68 | 65.90 | a | 74.37 | 84.07 | a | 87.71 | f | 93.42 | 89.14 | b | 82.90 | a | 75.55 | 65.59 | c | 53.32 | 70.95 | a | ||||||
1967 | 52.97 | 61.89 | 72.63 | d | 75.07 | 81.52 | d | 86.79 | b | 92.00 | d | 87.21 | b | 81.04 | b | 76.42 | e | 63.86 | b | 45.60 | f | 75.58 | a | |||
1968 | 51.06 | 58.76 | 62.19 | 69.18 | b | 80.04 | c | 91.33 | c | 90.25 | c | 85.22 | d | 82.56 | c | 75.42 | 58.37 | 47.74 | 71.01 | |||||||
1969 | 56.23 | 55.70 | a | 59.34 | b | 74.96 | b | 81.17 | a | 88.79 | a | 91.63 | a | 91.89 | c | 83.62 | a | 72.06 | 59.53 | 53.90 | 72.40 | |||||
1970 | 52.27 | a | 59.21 | 61.77 | a | 70.60 | 82.14 | c | 88.23 | 92.81 | 90.87 | a | 83.74 | c | 69.06 | 61.67 | 52.26 | 72.05 | ||||||||
1971 | 51.35 | 57.07 | 67.94 | 71.87 | 79.45 | 90.73 | 93.14 | c | 87.35 | 82.03 | 70.32 | c | 59.17 | 44.60 | a | 71.25 | ||||||||||
1972 | 53.27 | a | 61.03 | 73.35 | 77.14 | a | 80.87 | 89.70 | 92.17 | b | 88.59 | b | 81.37 | c | 71.19 | 54.53 | 51.35 | 72.88 | ||||||||
1973 | 47.13 | 52.46 | 60.23 | 66.97 | 79.80 | a | 88.33 | c | 89.67 | d | 89.55 | 83.77 | d | 76.61 | 64.70 | 54.29 | 71.13 | |||||||||
1974 | 49.00 | 56.43 | 71.06 | 73.43 | 84.81 | e | 94.46 | d | 90.35 | 87.74 | 81.72 | a | 70.60 | a | 59.53 | 46.62 | e | 72.15 | ||||||||
1975 | 47.39 | 54.61 | 63.10 | 68.86 | a | 77.77 | a | 88.60 | 89.77 | 89.59 | d | 79.79 | f | 75.00 | 61.73 | 50.97 | 69.76 | a | ||||||||
1976 | 51.32 | 62.69 | 64.76 | b | 72.13 | 78.48 | 88.60 | 88.90 | 87.50 | c | 81.00 | 69.68 | 57.97 | 48.97 | 71.00 | |||||||||||
1977 | 44.14 | b | 57.93 | 61.58 | 71.87 | 79.55 | b | 89.87 | 91.00 | a | 89.77 | 84.50 | 76.11 | d | 63.66 | a | 57.43 | a | 72.28 | |||||||
1978 | 51.65 | 54.11 | 65.80 | a | 76.23 | 79.13 | 91.19 | d | 93.58 | 89.79 | b | 81.86 | b | 75.53 | a | 60.17 | a | 48.97 | 72.33 | |||||||
1979 | 45.60 | a | 56.32 | 64.48 | 72.40 | 78.35 | 86.50 | 92.10 | 87.55 | 85.10 | 78.60 | a | 55.50 | 52.87 | a | 71.28 | ||||||||||
1980 | 53.23 | 59.34 | 62.03 | a | 72.23 | 78.74 | 93.70 | 95.81 | 90.13 | 84.90 | 72.52 | 61.77 | 57.55 | 73.50 | ||||||||||||
1981 | 55.55 | 62.11 | 63.73 | a | 76.97 | a | 79.58 | 93.20 | 92.97 | 89.71 | 83.23 | 71.83 | a | 66.00 | 58.45 | 74.44 | ||||||||||
1982 | 53.00 | i | 57.00 | f | 66.40 | k | 73.64 | h | 78.96 | e | ----- | z | 92.10 | a | 89.19 | d | 84.00 | h | 74.73 | i | 59.17 | f | 48.58 | e | 77.21 | h |
1983 | 50.80 | f | 55.82 | f | 65.52 | h | 67.17 | f | 80.96 | h | 87.89 | c | 93.43 | a | 91.68 | 89.42 | k | 74.95 | k | 65.39 | l | 54.74 | 81.94 | h | ||
1984 | 51.61 | 59.79 | 67.52 | 72.87 | 86.10 | 87.70 | 92.42 | 89.39 | 85.67 | 66.71 | 60.93 | 48.00 | 72.39 | |||||||||||||
1985 | 47.74 | 55.21 | 64.81 | 75.50 | 80.65 | 92.24 | a | 93.10 | 91.84 | 82.40 | 72.74 | 62.67 | 55.42 | 72.86 | ||||||||||||
1986 | 59.16 | 61.04 | 69.10 | 75.00 | 81.68 | 89.63 | 89.16 | 91.26 | 83.07 | 70.48 | 57.43 | 49.77 | 73.07 | |||||||||||||
1987 | 47.81 | 54.79 | 62.48 | 73.70 | 79.13 | 91.23 | 93.16 | 90.16 | 85.17 | 78.10 | 61.66 | a | 50.94 | 72.36 | ||||||||||||
1988 | 48.90 | 61.10 | 65.23 | 72.70 | 81.35 | 90.10 | a | 93.06 | 88.19 | 82.17 | 78.13 | 61.47 | 47.77 | 72.52 | ||||||||||||
1989 | 50.35 | 58.33 | a | 70.77 | 80.03 | 86.32 | 92.00 | a | 93.71 | 90.35 | 87.17 | 73.00 | 63.57 | 53.94 | 74.96 | |||||||||||
1990 | 52.48 | 57.00 | a | 66.65 | 74.93 | 80.97 | 95.83 | 92.16 | 88.87 | 85.50 | 77.42 | 61.93 | 48.55 | 73.52 | ||||||||||||
1991 | 49.00 | 62.46 | 63.45 | 73.67 | 82.61 | 88.77 | 90.65 | 89.94 | 82.43 | 77.90 | 57.60 | 48.74 | 72.27 | |||||||||||||
1992 | 44.23 | 57.34 | 65.39 | 76.87 | 79.94 | 88.67 | 91.16 | 82.84 | 81.30 | 78.32 | 54.69 | a | 44.42 | 70.43 | ||||||||||||
1993 | 53.68 | 57.46 | 66.55 | 74.50 | b | 82.53 | a | 90.86 | a | 95.32 | 90.84 | 84.50 | 73.61 | 59.47 | 52.71 | 73.50 | ||||||||||
1994 | 55.16 | 56.07 | 67.39 | 74.40 | 81.26 | 97.23 | 96.55 | 94.13 | 85.30 | 64.61 | 52.50 | b | 46.39 | 72.58 | ||||||||||||
1995 | 47.33 | a | 66.39 | 67.48 | 70.03 | 77.58 | 86.67 | 91.45 | 93.68 | 88.40 | 79.65 | 68.53 | 57.68 | 74.57 | ||||||||||||
1996 | 57.58 | 63.93 | a | 66.42 | 76.60 | 90.48 | 93.97 | 94.47 | a | 92.65 | 82.17 | 73.35 | 63.57 | 54.10 | 75.77 | |||||||||||
1997 | 49.77 | 58.25 | 71.16 | 68.69 | a | 83.26 | 89.27 | 94.19 | 91.48 | 87.10 | 75.16 | 60.30 | 45.87 | 72.88 | ||||||||||||
1998 | 54.48 | 55.21 | 62.29 | 69.07 | 82.45 | 91.77 | ----- | z | 93.13 | 91.43 | 74.45 | 63.87 | 55.65 | 72.16 | a | |||||||||||
1999 | 59.52 | 64.36 | 68.77 | 72.40 | 80.87 | 90.23 | 92.16 | 90.65 | 85.03 | 77.94 | 69.93 | 52.65 | 75.38 | |||||||||||||
2000 | 58.97 | a | 63.41 | 65.42 | 76.70 | 88.32 | 93.57 | 95.74 | 94.39 | 90.60 | 71.03 | 54.80 | 53.61 | 75.55 | ||||||||||||
2001 | 48.77 | a | 59.29 | 65.29 | 76.40 | 86.39 | 95.37 | 95.10 | 91.68 | 88.63 | 78.90 | 64.40 | 52.77 | 75.25 | ||||||||||||
2002 | 52.71 | 56.57 | 67.65 | 81.03 | 85.65 | 96.63 | 94.71 | 94.77 | 84.73 | 73.26 | 60.60 | 50.52 | 74.90 | |||||||||||||
2003 | 61.23 | 57.07 | 64.19 | 74.97 | 85.19 | 91.47 | 100.06 | 95.26 | 87.27 | 79.90 | 62.07 | 53.71 | 76.03 | |||||||||||||
2004 | 53.71 | 53.66 | 69.70 | a | 71.63 | 85.35 | 93.07 | 93.68 | 90.61 | 85.23 | 73.68 | 59.20 | 51.48 | 73.42 | ||||||||||||
2005 | 56.65 | 56.43 | 63.03 | a | 74.33 | 83.97 | 92.46 | b | 98.55 | 92.81 | 89.77 | 74.10 | 65.40 | 55.61 | 75.26 | |||||||||||
2006 | 57.10 | 62.50 | 65.87 | 79.00 | 88.48 | 95.97 | 95.06 | 87.97 | 81.47 | 73.84 | 67.23 | 49.52 | 75.33 | |||||||||||||
2007 | 44.60 | a | 59.21 | 69.58 | 72.80 | 82.06 | 95.23 | 96.87 | a | 97.19 | 88.20 | 77.68 | 67.60 | 51.58 | 75.22 | |||||||||||
2008 | 49.90 | 58.59 | 69.16 | 75.20 | 81.42 | 96.23 | 92.94 | 93.90 | 87.20 | 76.06 | 64.72 | a | 54.68 | 75.00 | ||||||||||||
2009 | 59.06 | 64.64 | 68.68 | 74.33 | 87.20 | a | 90.14 | a | 97.06 | 93.74 | 85.17 | 73.13 | 64.07 | 48.74 | 75.50 | |||||||||||
2010 | 51.50 | c | 53.75 | 62.90 | 74.13 | 81.35 | 95.34 | a | 94.21 | b | 92.87 | 89.67 | 77.26 | 62.27 | 56.65 | 74.33 | ||||||||||
2011 | 51.47 | a | 54.25 | 71.58 | 77.62 | d | 80.07 | a | 95.20 | 97.00 | 96.33 | a | 87.24 | a | 75.94 | 62.23 | 45.61 | 74.54 | ||||||||
2012 | 57.00 | 58.24 | 68.84 | 78.17 | a | 85.74 | 97.23 | 95.84 | 95.03 | 87.43 | 79.42 | 66.00 | 53.81 | 76.90 | ||||||||||||
2013 | 49.77 | 56.43 | 69.26 | 75.77 | 85.35 | 97.70 | 93.03 | 91.77 | 85.60 | 74.61 | 60.23 | 50.32 | 74.15 | |||||||||||||
2014 | 57.03 | 63.79 | 68.61 | 75.13 | 81.77 | a | 96.00 | 94.52 | 88.70 | a | 87.47 | 78.39 | 63.17 | 54.10 | 75.72 | |||||||||||
2015 | 49.97 | 62.07 | 69.97 | 74.40 | 78.74 | 93.93 | 92.19 | 94.94 | 90.77 | 77.10 | 61.93 | 51.94 | 74.83 | |||||||||||||
2016 | 51.81 | 63.90 | 72.23 | 75.50 | 81.07 | a | 97.00 | 99.13 | a | 91.10 | a | 87.90 | 81.77 | 65.13 | 53.77 | 76.69 | ||||||||||
2017 | 53.81 | 63.46 | 74.06 | 75.07 | 82.19 | 96.30 | 96.65 | 91.23 | 87.87 | 76.58 | 69.03 | 57.26 | 76.96 | |||||||||||||
2018 | 55.61 | 61.82 | 67.03 | 77.93 | 86.00 | 94.20 | 92.71 | 91.84 | 87.63 | 71.35 | 59.90 | 50.48 | 74.71 | |||||||||||||
2019 | 48.52 | 55.11 | 67.03 | 73.30 | 76.94 | 89.23 | 95.81 | 94.65 | 87.80 | 72.65 | 58.57 | 50.68 | 72.52 | |||||||||||||
2020 | 52.19 | 56.62 | 67.10 | 74.93 | 86.52 | 92.43 | 95.32 | 96.32 | 84.47 | 78.26 | 65.90 | 50.71 | 75.06 | |||||||||||||
2021 | 52.03 | 57.93 | 64.26 | 74.30 | 84.32 | 93.33 | 90.97 | 91.45 | 88.00 | 74.35 | 67.63 | 57.42 | 74.67 | |||||||||||||
2022 | 54.19 | 54.96 | 65.13 | 77.50 | 87.10 | 90.50 | 95.23 | 90.87 | 87.93 | 71.26 | 59.27 | 53.35 | 73.94 | |||||||||||||
2023 | 51.87 | 55.71 | 62.06 | 73.67 | 83.68 | 91.77 | 101.42 | 94.55 | 87.80 | 78.06 | 61.67 | 52.48 | 74.56 | |||||||||||||
2024 | 52.26 | 61.45 | 64.65 | 73.83 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 59.45 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 51.62 | 58.15 | 65.92 | 74.08 | 82.28 | 91.77 | 93.53 | 91.00 | 85.07 | 74.45 | 61.59 | 51.64 | 73.55 | |||||||||||||
S.D. | 4.07 | 3.95 | 3.70 | 2.82 | 3.05 | 3.16 | 2.62 | 2.80 | 2.85 | 3.45 | 3.80 | 3.51 | 1.78 | |||||||||||||
SKEW | 0.28 | -0.47 | 0.00 | -0.18 | 0.47 | 0.09 | 0.68 | -0.02 | 0.17 | -0.42 | -0.14 | -0.18 | -0.05 | |||||||||||||
MAX | 61.23 | 66.39 | 74.06 | 81.03 | 90.48 | 97.70 | 101.42 | 97.19 | 91.43 | 81.77 | 69.93 | 58.45 | 76.96 | |||||||||||||
MIN | 44.14 | 44.15 | 57.03 | 66.97 | 76.94 | 84.70 | 88.90 | 82.84 | 79.53 | 64.61 | 52.50 | 43.52 | 69.75 | |||||||||||||
YRS | 65 | 65 | 65 | 64 | 65 | 64 | 65 | 68 | 65 | 66 | 65 | 64 | 58 |