YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 11.10 | d | 15.85 | 38.83 | 56.95 | 61.73 | b | 66.83 | a | 65.00 | 54.93 | 45.88 | b | 29.19 | f | 11.89 | c | 42.90 | b | |||||
1945 | ----- | z | ----- | z | 32.25 | a | 35.83 | a | 44.74 | 57.07 | 66.24 | 66.24 | 53.36 | b | 43.13 | 19.68 | b | 3.55 | a | 42.21 | b | |||||
1946 | 5.09 | d | 4.11 | 32.24 | 45.10 | 50.58 | a | 61.47 | 69.17 | a | 64.03 | 54.38 | 39.73 | a | 24.05 | 8.95 | 38.24 | |||||||||
1947 | 11.89 | 4.94 | a | 19.94 | 37.14 | a | 48.00 | a | 58.47 | 69.03 | 69.71 | 54.60 | 50.45 | 20.90 | a | 10.20 | a | 37.94 | ||||||||
1948 | 3.32 | a | 1.90 | e | 14.05 | 35.67 | 53.89 | 61.58 | 68.50 | 67.58 | 62.55 | 46.19 | 25.88 | b | 7.27 | 37.36 | ||||||||||
1949 | ----- | z | 0.04 | a | 17.62 | a | 44.83 | a | 55.15 | 63.47 | a | 67.68 | 70.06 | 55.10 | 43.07 | a | 32.48 | 6.69 | e | 41.47 | a | |||||
1950 | ----- | z | 4.73 | ----- | z | 28.03 | 48.20 | a | 62.40 | 66.32 | c | 63.61 | 57.73 | 45.34 | 19.97 | 6.82 | a | 40.32 | b | |||||||
1951 | 2.02 | a | 9.36 | 14.23 | 38.87 | 57.75 | a | 59.78 | 67.83 | a | 63.32 | 52.18 | 41.52 | a | 18.58 | 5.31 | 35.90 | |||||||||
1952 | 1.56 | 16.68 | a | 19.82 | 48.13 | 55.91 | d | 64.22 | c | 68.35 | 66.52 | 60.47 | 41.50 | 29.27 | b | 16.79 | 40.77 | |||||||||
1953 | 9.15 | 16.38 | d | 24.31 | 36.35 | 51.89 | 62.47 | 67.52 | 70.29 | 57.05 | 51.48 | 33.68 | 14.82 | a | 41.28 | |||||||||||
1954 | -5.36 | c | 25.62 | 21.97 | 37.43 | a | 47.66 | 61.53 | 69.35 | 65.58 | 53.82 | 43.71 | 32.42 | 18.16 | 39.33 | |||||||||||
1955 | 6.39 | 5.57 | 14.08 | 48.92 | 57.47 | 63.15 | 71.81 | 72.12 | e | 54.43 | b | 46.34 | 15.20 | 1.95 | 38.12 | |||||||||||
1956 | 4.25 | a | 3.83 | 14.47 | 30.82 | 51.73 | 67.71 | a | 66.19 | b | ----- | z | 55.61 | u | 47.37 | 28.12 | 13.87 | 32.83 | b | |||||||
1957 | 0.65 | 9.34 | 24.44 | 39.75 | 53.73 | 59.48 | 71.47 | 66.23 | 53.37 | 43.34 | 27.03 | 18.98 | 38.98 | |||||||||||||
1958 | 15.53 | a | 9.18 | 27.40 | 42.72 | 54.95 | 57.48 | 64.60 | 66.23 | 57.08 | 45.45 | 25.25 | 6.24 | 39.34 | ||||||||||||
1959 | -1.98 | 4.78 | a | 27.32 | 40.10 | a | 50.90 | 64.73 | 69.05 | b | 69.50 | 55.82 | 36.43 | a | 16.38 | e | 20.98 | 37.84 | ||||||||
1960 | 4.98 | 8.10 | 13.31 | 38.13 | 54.27 | 61.17 | 70.26 | 68.15 | 57.90 | 44.68 | 26.57 | 9.68 | 38.10 | |||||||||||||
1961 | 6.45 | 14.24 | a | 29.35 | a | 35.22 | 51.37 | 66.92 | 67.16 | 70.50 | 53.02 | a | 44.76 | 27.37 | 5.63 | 39.33 | ||||||||||
1962 | 2.13 | 3.64 | 18.95 | 36.98 | 51.32 | 63.13 | 65.40 | 67.74 | 53.22 | 47.47 | 30.95 | 14.29 | 37.94 | |||||||||||||
1963 | 0.53 | 8.66 | 29.82 | 41.68 | 51.85 | 66.78 | 70.52 | 68.35 | 60.47 | 54.87 | 30.75 | 6.60 | 40.91 | |||||||||||||
1964 | 12.05 | 15.97 | 16.73 | 41.43 | 56.53 | ----- | z | ----- | z | ----- | z | 44.07 | w | 43.77 | 25.73 | -0.55 | c | 26.46 | d | |||||||
1965 | -2.10 | a | 3.61 | 12.00 | 37.13 | 50.80 | a | 60.88 | a | 65.05 | a | 64.02 | 44.00 | 45.07 | a | 21.47 | 16.29 | 34.85 | ||||||||
1966 | -10.68 | 2.88 | 25.84 | 33.80 | 47.60 | 62.60 | 69.82 | 63.21 | 57.07 | 42.22 | d | 18.22 | a | 6.53 | 34.93 | |||||||||||
1967 | 4.25 | a | -1.50 | 20.90 | a | 33.40 | 47.21 | 60.80 | 65.48 | a | 64.26 | 57.23 | 40.31 | 25.62 | 11.50 | 35.79 | ||||||||||
1968 | 0.90 | b | 5.74 | 29.62 | a | 38.73 | 49.27 | a | 59.68 | 63.63 | 60.42 | 54.35 | 41.84 | 27.10 | 6.52 | a | 36.48 | |||||||||
1969 | -4.15 | a | 8.46 | a | 12.47 | b | 41.07 | 52.34 | 53.55 | 64.40 | 68.97 | 56.12 | 36.26 | 26.85 | 14.31 | 35.89 | ||||||||||
1970 | -1.81 | 7.96 | a | 12.93 | b | 34.36 | a | 47.95 | a | 65.90 | 68.39 | 65.85 | 54.73 | 42.63 | 23.43 | 4.92 | 35.60 | |||||||||
1971 | -4.50 | 7.06 | d | 18.53 | 38.55 | 50.95 | 63.27 | 62.18 | 65.52 | 54.57 | 43.98 | 23.20 | b | 7.38 | a | 35.89 | ||||||||||
1972 | -1.63 | 2.60 | c | 19.10 | 35.95 | 56.65 | 63.35 | 62.65 | 65.63 | 50.68 | 38.32 | a | 23.00 | 0.17 | a | 34.70 | ||||||||||
1973 | 10.63 | 12.24 | a | 32.26 | 38.25 | 52.73 | 61.95 | 65.55 | 67.90 | a | 52.40 | a | 47.30 | a | 20.37 | 6.33 | a | 38.99 | ||||||||
1974 | -4.40 | 2.39 | 13.66 | 36.97 | 47.80 | a | 63.17 | 70.26 | 61.53 | 50.62 | a | 43.92 | 25.97 | 17.23 | 35.76 | |||||||||||
1975 | 6.43 | a | 6.22 | a | 15.48 | 32.05 | a | 52.45 | 61.82 | 69.63 | 63.60 | 52.55 | a | 44.71 | 30.64 | a | 8.98 | 37.05 | ||||||||
1976 | 4.31 | b | 16.40 | 20.00 | 43.33 | a | 54.20 | a | 63.90 | 66.98 | 67.27 | a | 55.71 | b | 36.80 | a | 21.77 | 4.14 | b | 37.90 | ||||||
1977 | -5.78 | a | 14.94 | b | 29.93 | a | 45.50 | 62.60 | b | 63.25 | 67.13 | 58.79 | 53.85 | 44.84 | 23.60 | ----- | z | 41.70 | a | |||||||
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.29 | i | 66.80 | a | 64.84 | 59.38 | b | 41.22 | d | 18.95 | a | 2.61 | 42.30 | f | ||
1979 | -8.56 | -6.39 | 13.68 | a | 28.73 | 45.42 | 60.80 | 67.24 | 60.48 | 55.71 | a | 40.52 | 23.59 | a | 17.65 | a | 33.24 | |||||||||
1980 | 1.83 | a | 5.38 | 15.57 | b | 46.67 | 58.53 | 61.81 | a | 67.16 | 60.47 | 51.55 | 39.69 | 28.25 | 8.11 | c | 37.09 | |||||||||
1981 | 8.66 | 14.57 | 30.19 | 40.95 | 50.85 | 58.88 | 65.68 | 66.61 | 53.03 | 40.07 | a | 32.82 | b | 6.85 | a | 39.10 | ||||||||||
1982 | -13.35 | e | 4.55 | h | 19.37 | a | 35.92 | 53.60 | 55.33 | a | 65.87 | a | 62.20 | a | 52.93 | 42.03 | a | 21.05 | b | 14.82 | c | 37.25 | a | |||
1983 | 12.79 | c | 14.83 | b | 23.35 | a | 36.53 | 47.60 | 63.45 | 70.78 | a | 70.88 | a | 53.93 | 40.53 | a | 26.50 | -4.50 | b | 38.06 | ||||||
1984 | 7.16 | b | 21.21 | a | 17.21 | 41.75 | 49.74 | 61.27 | b | 67.15 | a | 69.91 | d | 49.33 | 43.47 | a | 25.06 | e | 5.23 | c | 38.21 | |||||
1985 | 2.94 | d | 4.52 | 28.26 | b | 43.16 | a | 56.13 | 57.77 | 64.72 | b | 60.90 | a | 51.21 | a | 40.54 | c | 12.67 | a | -1.70 | i | 38.44 | a | |||
1986 | 10.70 | c | 7.89 | a | 28.71 | g | 40.57 | 55.56 | 64.71 | a | 67.73 | 63.22 | b | 55.67 | 43.15 | d | 15.56 | c | 14.40 | a | 39.92 | a | ||||
1987 | 13.30 | a | 21.65 | b | 22.50 | 47.14 | b | 57.73 | c | 66.72 | a | 67.85 | 63.34 | b | 57.17 | a | 37.44 | e | 32.29 | b | 17.48 | d | 42.05 | |||
1988 | 1.84 | c | 1.22 | f | 24.33 | d | 40.85 | f | 57.83 | h | 70.07 | b | 68.57 | b | 66.63 | d | 54.29 | b | 38.77 | a | 23.68 | 10.21 | b | 39.82 | c | |
1989 | 6.89 | -0.87 | b | 14.69 | 36.93 | 55.60 | 60.22 | a | 70.71 | 67.89 | 56.40 | 43.56 | 20.07 | 3.11 | 36.27 | |||||||||||
1990 | 17.71 | 11.54 | 26.92 | 40.22 | 51.76 | 63.13 | 66.90 | 67.77 | 58.58 | 41.23 | 26.93 | 5.87 | 39.88 | |||||||||||||
1991 | 1.40 | 19.24 | a | 26.05 | 44.40 | 57.15 | 66.73 | 67.40 | 69.02 | 55.33 | 36.97 | 19.80 | c | 15.33 | a | 39.90 | ||||||||||
1992 | 12.84 | 17.50 | 29.31 | 36.40 | 56.76 | 60.48 | 60.45 | 61.68 | 51.64 | a | 41.76 | 22.77 | 3.84 | 37.95 | ||||||||||||
1993 | 1.48 | b | 5.54 | a | 20.69 | 40.12 | 53.45 | 58.80 | b | 63.05 | 64.63 | 51.63 | 39.42 | a | 22.43 | 11.86 | b | 36.09 | ||||||||
1994 | -9.04 | c | -0.39 | e | 26.06 | 39.71 | a | 56.08 | 64.02 | a | 64.21 | 64.26 | 58.52 | 45.63 | 28.14 | a | 14.58 | 37.65 | ||||||||
1995 | 4.48 | a | 8.75 | 20.63 | 33.83 | a | 51.69 | 68.30 | 66.69 | 67.55 | a | 56.03 | a | 41.42 | 16.67 | 6.29 | b | 36.86 | ||||||||
1996 | -4.84 | b | 7.67 | c | 13.43 | a | 31.85 | 51.18 | a | 64.87 | 66.03 | 67.92 | 56.41 | a | 42.08 | 11.73 | b | 2.14 | b | 34.21 | ||||||
1997 | -3.67 | a | 10.36 | 15.52 | 34.20 | b | 49.11 | 67.00 | b | 67.79 | 66.29 | b | 59.03 | a | 42.53 | 22.46 | b | 22.55 | 37.76 | |||||||
1998 | 6.52 | 24.30 | 21.24 | 46.83 | 58.21 | 60.45 | a | 69.11 | 70.21 | 61.77 | 44.28 | a | 25.22 | 12.42 | a | 41.71 | ||||||||||
1999 | 0.95 | 17.41 | 25.31 | b | 41.82 | 54.90 | 62.93 | 69.35 | 65.69 | 54.88 | 41.47 | 34.66 | a | 20.53 | 40.83 | |||||||||||
2000 | 7.19 | 20.18 | a | 33.05 | 39.10 | a | 55.35 | 60.33 | 69.03 | 68.77 | a | 55.21 | a | 44.82 | 21.86 | a | -2.87 | a | 39.34 | |||||||
2001 | 11.05 | 1.07 | a | 21.30 | a | 40.45 | 55.78 | a | 62.90 | 70.17 | a | 69.73 | 57.17 | 41.00 | a | 35.68 | 15.92 | a | 40.18 | |||||||
2002 | 12.37 | a | 20.11 | 15.03 | a | 35.98 | 47.32 | 65.60 | 70.58 | 65.32 | a | 58.77 | 33.40 | b | 24.07 | a | 16.81 | 38.78 | ||||||||
2003 | 4.21 | 0.56 | a | 18.21 | 41.67 | 53.61 | 63.25 | 67.68 | 70.06 | 56.15 | 45.92 | a | 18.97 | a | 17.36 | b | 38.14 | |||||||||
2004 | -3.06 | 8.61 | a | 22.65 | 39.92 | 47.93 | b | 58.74 | a | 65.92 | 60.36 | b | 57.80 | b | 43.45 | b | 31.68 | 12.77 | 37.23 | |||||||
2005 | -0.33 | a | 13.36 | 22.07 | a | 46.02 | 51.21 | 64.70 | 68.44 | 64.93 | b | 59.03 | 44.94 | 29.43 | a | 15.15 | a | 39.91 | ||||||||
2006 | 20.52 | 5.24 | a | 21.00 | b | 46.48 | a | 54.77 | 64.62 | 72.60 | a | 67.81 | 55.67 | 39.43 | a | 25.80 | b | 19.35 | a | 41.11 | ||||||
2007 | 7.89 | ----- | z | 24.56 | 39.90 | 55.00 | a | 65.25 | 70.61 | 64.15 | 56.53 | 45.47 | 27.48 | a | 6.37 | 42.11 | a | |||||||||
2008 | 4.74 | f | 1.75 | a | 19.23 | 37.69 | a | 49.21 | b | 60.55 | b | 66.94 | 66.76 | 56.43 | 43.44 | 26.79 | b | -0.26 | 38.96 | a | ||||||
2009 | -2.83 | b | 6.16 | 16.02 | 36.95 | 49.90 | 61.40 | 64.58 | 64.00 | 63.22 | 37.63 | 34.93 | b | 5.52 | 36.46 | |||||||||||
2010 | 6.34 | b | 6.67 | d | 28.95 | a | 47.85 | 53.82 | a | 62.95 | a | 69.10 | 68.92 | 53.20 | 47.70 | a | 25.78 | 5.82 | a | 39.76 | ||||||
2011 | -0.47 | b | 6.21 | 17.17 | a | 37.76 | a | 51.18 | a | 61.25 | 70.45 | 67.23 | 57.38 | 47.65 | 29.10 | a | 19.14 | b | 38.67 | |||||||
2012 | 14.53 | 16.70 | b | 36.62 | b | 43.67 | 55.35 | a | 64.71 | a | 73.05 | a | 66.61 | 55.30 | b | 39.20 | c | 23.85 | 10.26 | 41.65 | ||||||
2013 | 6.66 | 9.84 | 13.06 | 27.28 | 52.07 | a | 64.00 | 68.27 | 68.34 | 60.90 | 41.82 | a | 24.18 | 0.62 | a | 36.42 | ||||||||||
2014 | 0.03 | -0.12 | 15.53 | a | 34.87 | 53.35 | 63.50 | a | 66.62 | a | 66.28 | h | 56.92 | 45.10 | 18.88 | 15.29 | b | 33.63 | a | |||||||
2015 | 9.07 | a | -0.04 | 26.79 | 41.17 | d | 52.42 | a | 64.50 | b | 68.20 | f | 67.05 | a | 61.09 | c | 46.23 | 31.92 | 18.73 | 38.08 | a | |||||
2016 | 8.37 | 17.84 | a | 32.05 | 38.08 | 57.85 | 64.05 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 36.38 | f | ||||
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 65.13 | e | 56.93 | a | 44.68 | 21.68 | 11.24 | 39.93 | g | |||
2018 | 7.31 | -5.65 | o | 22.65 | e | 29.93 | c | 60.52 | 68.07 | 69.10 | 67.81 | 55.35 | c | 36.74 | 19.40 | f | 15.97 | 43.34 | b | |||||||
2019 | 3.02 | -4.20 | a | 16.82 | 39.26 | a | 50.02 | a | 64.41 | g | 70.23 | 64.98 | 57.83 | a | 36.28 | h | 23.29 | b | 11.27 | a | 33.25 | b | ||||
2020 | 8.60 | b | 13.14 | k | 22.83 | b | 35.53 | 52.29 | 67.38 | 71.97 | 68.60 | 57.38 | a | 36.63 | 28.95 | 20.68 | 42.80 | a | ||||||||
2021 | 16.57 | b | 16.25 | r | 32.95 | 39.22 | 53.50 | a | 69.33 | 71.62 | j | 69.05 | 61.85 | 48.19 | 29.26 | a | 13.07 | a | 43.30 | b | ||||||
2022 | 1.22 | a | -4.12 | x | 21.61 | 31.33 | 53.15 | 65.72 | 70.34 | 68.10 | 59.45 | 45.37 | 23.62 | 5.25 | a | 40.47 | a | |||||||||
2023 | 10.63 | p | -0.93 | u | 11.37 | a | 31.09 | b | 60.53 | 70.77 | 66.97 | 67.68 | 62.40 | 44.61 | 29.10 | 24.47 | 46.90 | b | ||||||||
2024 | 9.76 | ----- | z | 27.79 | g | 43.71 | r | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 9.76 | k | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 3.97 | 8.72 | 21.54 | 38.70 | 52.92 | 62.90 | 67.71 | 66.20 | 55.87 | 42.90 | 24.92 | 10.41 | 38.03 | |||||||||||||
S.D. | 6.90 | 7.10 | 6.35 | 4.90 | 3.69 | 3.25 | 2.50 | 2.91 | 3.32 | 3.73 | 5.22 | 6.49 | 2.06 | |||||||||||||
SKEW | -0.06 | 0.36 | 0.34 | -0.05 | 0.10 | -0.08 | -0.32 | -0.43 | -0.27 | 0.16 | -0.16 | -0.03 | -0.04 | |||||||||||||
MAX | 20.52 | 25.62 | 36.62 | 48.92 | 62.60 | 70.77 | 73.05 | 72.12 | 63.22 | 54.87 | 35.68 | 24.47 | 42.05 | |||||||||||||
MIN | -13.35 | -6.39 | 11.37 | 27.28 | 44.74 | 53.55 | 60.45 | 58.79 | 44.00 | 33.40 | 11.73 | -4.50 | 33.24 | |||||||||||||
YRS | 73 | 69 | 76 | 77 | 77 | 76 | 75 | 76 | 77 | 78 | 77 | 77 | 56 |