YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 66.85 | 52.57 | a | 48.03 | b | 32.03 | 7.55 | 41.41 | g | |||
1935 | -3.79 | c | 21.59 | a | 23.53 | 38.38 | 52.26 | 59.72 | 73.57 | a | 65.79 | 54.16 | a | 43.73 | 15.88 | a | 9.97 | a | 37.90 | |||||||
1936 | -9.70 | a | -13.21 | a | 22.47 | a | 34.26 | a | 59.17 | a | 63.10 | 74.69 | d | 62.52 | a | 53.38 | b | 38.16 | b | 20.91 | n | 13.83 | a | 36.24 | a | |
1937 | -10.71 | 5.71 | b | 21.82 | 36.34 | b | 58.02 | a | 69.12 | m | 69.63 | a | 70.04 | g | 57.95 | 40.52 | a | ----- | z | ----- | z | 34.91 | d | |||
1938 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 62.45 | b | ----- | z | ----- | z | ----- | z | ----- | z | 20.94 | d | 14.52 | c | 32.64 | i |
1939 | 6.31 | -5.36 | c | 22.15 | k | 39.57 | g | 57.47 | b | 60.60 | a | 72.89 | 69.45 | a | 57.54 | d | 39.13 | a | 35.44 | e | 23.61 | c | 41.71 | b | ||
1940 | 3.87 | h | 13.80 | b | 16.63 | e | 36.50 | a | 55.02 | b | 61.69 | a | 70.21 | 68.40 | 62.48 | b | 50.43 | a | 22.39 | b | 17.71 | c | 43.21 | a | ||
1941 | 7.34 | c | 7.37 | e | 21.10 | f | 42.68 | b | 57.50 | b | 65.98 | 72.42 | 67.77 | 55.92 | 43.73 | 27.85 | c | 17.08 | 42.33 | a | ||||||
1942 | 15.42 | 8.90 | c | 27.97 | a | 44.33 | c | 50.68 | 61.24 | a | 67.71 | 66.26 | 53.97 | a | 47.11 | 23.63 | 4.68 | 39.32 | ||||||||
1943 | -5.19 | b | 10.12 | 14.90 | 42.15 | 50.90 | a | 61.07 | 72.90 | 68.48 | 55.07 | 48.00 | 27.41 | a | 17.71 | b | 38.63 | |||||||||
1944 | 18.10 | 8.46 | d | 16.13 | d | 41.20 | 57.59 | d | 63.50 | b | 69.27 | 66.60 | 57.23 | 47.38 | a | 30.33 | a | 13.06 | e | 40.74 | ||||||
1945 | 9.30 | c | 10.61 | e | 33.55 | b | 36.09 | b | 46.44 | d | 60.30 | b | 67.21 | 63.28 | a | 50.71 | a | 42.81 | 19.73 | f | 5.75 | c | 38.73 | a | ||
1946 | 4.19 | g | 3.25 | 30.60 | b | ----- | z | 52.29 | 63.32 | 69.98 | 65.82 | 55.66 | b | 40.58 | 24.10 | 6.30 | a | 41.19 | b | |||||||
1947 | 11.02 | c | 5.78 | c | 23.33 | b | 39.57 | 48.85 | 58.55 | 66.98 | 67.17 | a | 52.95 | 48.60 | 20.20 | b | 7.33 | a | 37.53 | |||||||
1948 | 2.92 | g | 3.12 | 15.00 | e | 37.30 | c | 55.45 | c | 61.81 | f | 67.60 | 69.39 | 64.18 | 47.85 | 27.85 | 8.48 | 39.62 | b | |||||||
1949 | 0.82 | -1.74 | a | 19.39 | 46.17 | 56.98 | 65.20 | 69.48 | a | 70.61 | 56.00 | 43.41 | c | 32.79 | a | 7.15 | a | 38.86 | ||||||||
1950 | -11.56 | 4.57 | a | 18.27 | 30.90 | 50.95 | a | 63.62 | a | 67.23 | 63.48 | a | 57.56 | c | 45.68 | a | 19.67 | a | 6.34 | b | 34.73 | |||||
1951 | 2.13 | a | 9.70 | 13.48 | e | 35.62 | m | 58.45 | a | 60.78 | a | 67.98 | a | 64.26 | b | 53.41 | a | 41.24 | b | 20.67 | c | ----- | z | 39.21 | b | |
1952 | ----- | z | ----- | z | ----- | z | 63.71 | r | 56.18 | 66.66 | a | 69.22 | a | 67.63 | 60.90 | 43.11 | 31.77 | b | 18.23 | 51.71 | d | |||||
1953 | 8.05 | 12.95 | 24.71 | c | 38.25 | 54.02 | 63.84 | a | 67.94 | 69.70 | a | 56.93 | 51.77 | 34.02 | b | 16.03 | 41.52 | |||||||||
1954 | -4.34 | 26.74 | a | 24.41 | b | 37.83 | a | 50.00 | 63.43 | 69.80 | a | 65.53 | 55.78 | a | 44.95 | a | 33.33 | 20.20 | a | 40.64 | ||||||
1955 | 4.95 | 4.96 | b | 12.15 | 48.98 | 58.18 | a | 64.66 | a | 72.29 | 71.68 | 56.70 | 46.30 | a | 15.77 | b | 1.18 | a | 38.15 | |||||||
1956 | 3.67 | a | 5.38 | 16.71 | 32.53 | a | 52.48 | b | 68.97 | a | 66.26 | 66.94 | 53.42 | 48.94 | 29.10 | a | 11.65 | a | 38.00 | |||||||
1957 | ----- | z | 9.85 | a | 24.81 | 41.34 | b | 55.84 | 60.45 | 72.63 | 67.06 | 54.73 | 45.25 | a | 26.77 | b | 17.86 | b | 43.33 | a | ||||||
1958 | 16.05 | 10.46 | 28.64 | b | 44.87 | 57.63 | 60.12 | a | 66.50 | 66.76 | 57.72 | 46.84 | 26.28 | 4.45 | 40.53 | |||||||||||
1959 | -1.97 | 5.70 | a | 26.00 | 41.00 | 52.58 | 66.02 | 70.26 | 70.02 | 56.63 | 36.95 | 18.80 | 22.71 | 38.73 | ||||||||||||
1960 | 5.24 | 10.05 | 15.97 | 39.24 | a | 55.65 | 63.55 | a | 71.44 | 70.85 | 61.02 | 46.74 | 28.02 | 9.47 | 39.77 | |||||||||||
1961 | 6.19 | 16.31 | a | 29.95 | 36.68 | 54.31 | 69.34 | e | 69.05 | 72.87 | 54.58 | 46.74 | b | 29.05 | 4.97 | 40.84 | ||||||||||
1962 | 1.63 | 2.20 | 19.61 | 36.18 | 53.15 | 66.52 | a | 67.19 | 68.29 | 55.48 | 50.88 | a | 31.37 | 13.94 | 38.87 | |||||||||||
1963 | 0.65 | 9.46 | 29.21 | 42.68 | 52.90 | 68.70 | 71.89 | 69.00 | 61.72 | 56.39 | 31.93 | 6.85 | 41.78 | |||||||||||||
1964 | 12.18 | 16.36 | 17.40 | 42.48 | 58.32 | 61.20 | 70.53 | 63.08 | 54.79 | a | 46.29 | 28.76 | a | 3.03 | 39.54 | |||||||||||
1965 | -0.07 | a | 8.39 | a | 14.18 | 40.17 | 53.60 | a | 63.72 | 66.98 | a | 66.32 | 48.15 | 48.10 | 23.17 | 17.44 | 37.51 | |||||||||
1966 | -10.07 | a | 3.11 | 26.47 | 36.60 | 50.77 | 64.08 | 70.90 | 65.84 | 58.95 | 43.89 | 19.87 | 8.27 | 36.56 | ||||||||||||
1967 | 6.00 | 1.14 | 22.52 | 36.41 | a | 49.21 | 63.77 | 68.29 | 67.08 | 61.25 | 43.65 | 28.02 | 13.34 | 38.39 | ||||||||||||
1968 | 3.73 | 6.76 | 30.47 | 42.48 | 51.35 | 62.53 | a | 66.97 | 63.24 | 57.97 | 44.89 | 29.95 | 9.07 | a | 39.12 | |||||||||||
1969 | -3.77 | 10.14 | 16.34 | 43.77 | 55.37 | 56.72 | 67.02 | 72.00 | 58.13 | 38.82 | 28.70 | 14.88 | a | 38.18 | ||||||||||||
1970 | 0.13 | a | 7.98 | 12.60 | 36.03 | 51.13 | 68.25 | 70.89 | 67.74 | 58.50 | a | 45.48 | 26.17 | 5.88 | a | 37.57 | ||||||||||
1971 | -3.97 | 12.36 | 22.98 | 40.80 | 54.35 | 65.87 | 64.34 | 68.19 | 57.47 | 46.50 | 24.87 | 9.50 | 38.61 | |||||||||||||
1972 | -0.06 | 3.59 | 22.15 | 39.50 | a | 60.31 | 65.93 | 65.87 | 69.11 | 54.27 | 41.27 | 23.77 | 3.81 | 37.46 | ||||||||||||
1973 | 13.18 | 14.52 | 34.70 | a | 41.00 | 55.40 | 65.87 | 67.16 | 70.23 | 56.57 | 50.24 | 22.12 | 7.45 | 41.54 | ||||||||||||
1974 | -3.27 | c | 8.07 | 17.53 | 39.07 | 50.74 | 65.38 | 73.20 | a | 63.40 | a | 53.65 | 46.48 | 28.05 | 19.55 | 38.49 | ||||||||||
1975 | 9.45 | 7.52 | 17.87 | 36.55 | 55.53 | 63.88 | 70.92 | l | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 31.80 | f | ||||||
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 68.74 | n | 68.85 | 60.42 | 41.02 | 26.45 | 4.21 | 40.19 | g | |||||
1977 | -0.27 | 18.15 | a | 32.10 | 49.40 | 66.24 | 67.64 | w | 67.44 | 59.69 | 54.75 | 46.00 | a | 24.17 | 3.21 | 38.26 | a | |||||||||
1978 | -5.40 | 1.52 | a | 20.34 | 39.25 | 57.87 | a | 62.42 | 66.89 | 64.50 | 59.33 | 44.10 | 19.17 | 3.52 | 36.12 | |||||||||||
1979 | -8.74 | -6.66 | 14.81 | 28.92 | 46.45 | 62.15 | 69.19 | 61.79 | 56.65 | 41.44 | 25.32 | 18.08 | 34.12 | |||||||||||||
1980 | 1.90 | 6.50 | 16.79 | 47.27 | 60.61 | 62.73 | 67.92 | 61.74 | 52.58 | 40.77 | 32.17 | 9.17 | a | 38.35 | ||||||||||||
1981 | 11.11 | 16.67 | a | 30.92 | 42.38 | 52.40 | 61.20 | 67.68 | 67.82 | 55.08 | 42.06 | 35.63 | 10.15 | 41.09 | ||||||||||||
1982 | -11.40 | 8.28 | a | 20.98 | 37.50 | 55.10 | 56.55 | 67.03 | a | 62.84 | 54.92 | 42.58 | a | 22.97 | a | 16.76 | 36.18 | |||||||||
1983 | 13.91 | b | 15.88 | 23.53 | 38.05 | 48.30 | a | 62.40 | 71.22 | a | 71.84 | 55.52 | 42.05 | 29.41 | a | -2.48 | 39.14 | |||||||||
1984 | 7.50 | 23.09 | 19.47 | 44.05 | 50.69 | 63.15 | 67.32 | 69.63 | 51.60 | 43.29 | 23.78 | 4.02 | 38.97 | |||||||||||||
1985 | 3.58 | 3.75 | 29.52 | 44.50 | 56.66 | 56.20 | 65.29 | 60.55 | a | 50.63 | 41.18 | 11.98 | 0.48 | b | 35.36 | |||||||||||
1986 | 10.08 | 7.00 | 28.00 | 40.33 | 56.45 | 63.33 | 67.61 | 63.03 | 52.77 | 43.08 | 18.19 | a | 16.37 | 38.85 | ||||||||||||
1987 | 13.26 | 21.70 | 22.52 | 48.55 | 57.79 | 66.50 | a | 67.37 | 63.37 | 57.47 | a | 39.00 | a | 32.22 | 18.94 | 42.39 | ||||||||||
1988 | 2.35 | a | 6.54 | a | 25.26 | 41.82 | 58.15 | 71.28 | 70.44 | 69.05 | 54.83 | 40.68 | 24.82 | 13.38 | b | 39.88 | ||||||||||
1989 | 5.16 | -0.70 | 13.55 | 36.98 | a | 57.35 | a | 61.93 | 72.32 | 67.71 | 55.98 | 43.13 | 20.02 | 1.32 | 36.23 | |||||||||||
1990 | 15.37 | a | 8.16 | 25.27 | 39.52 | 51.10 | 64.10 | 66.00 | 67.32 | 57.78 | 42.16 | 26.70 | 6.13 | 39.13 | ||||||||||||
1991 | 0.74 | 17.70 | 25.10 | 44.78 | 57.21 | 66.50 | 66.84 | 69.16 | 54.88 | 36.53 | 18.73 | 14.83 | a | 39.42 | ||||||||||||
1992 | 13.37 | a | 14.81 | 27.19 | 36.00 | 55.76 | 59.73 | 60.16 | 62.19 | 52.40 | a | 41.69 | 24.25 | 3.85 | 37.62 | |||||||||||
1993 | 1.24 | 7.70 | 23.79 | b | 40.83 | c | 53.42 | 59.67 | 62.89 | 64.48 | a | 51.08 | 39.45 | a | 22.68 | 11.69 | 36.58 | |||||||||
1994 | -8.66 | c | -0.87 | a | 29.36 | c | 40.20 | 55.39 | 63.77 | 64.42 | 63.44 | 58.52 | 46.73 | 28.66 | b | 13.73 | 37.89 | |||||||||
1995 | 3.88 | a | 8.63 | a | 20.98 | 34.10 | 51.03 | 68.80 | 66.19 | 66.32 | 54.92 | 41.42 | 16.25 | b | 5.23 | 36.48 | ||||||||||
1996 | -6.08 | a | 5.71 | 12.94 | 30.10 | a | 50.19 | 64.43 | 65.55 | 66.50 | 55.55 | 43.03 | a | 11.67 | 1.63 | 33.43 | ||||||||||
1997 | -2.85 | 8.91 | 14.95 | 31.72 | a | ----- | z | 66.47 | ----- | z | 64.61 | 57.98 | 40.92 | ----- | z | 23.48 | 34.02 | c | ||||||||
1998 | 3.92 | 21.93 | 20.91 | b | 45.08 | 55.66 | 58.67 | 66.18 | 66.84 | 58.83 | 42.66 | 25.50 | 12.42 | 39.88 | ||||||||||||
1999 | -1.23 | 16.30 | 26.23 | 41.25 | 53.42 | 60.25 | 65.76 | 62.89 | 52.67 | 39.76 | 33.48 | 19.50 | a | 39.19 | ||||||||||||
2000 | 3.92 | 18.88 | 32.18 | 38.45 | b | 53.02 | b | 58.08 | 66.35 | 64.55 | b | 52.65 | 43.27 | 23.00 | -4.72 | a | 37.47 | |||||||||
2001 | 10.13 | -0.54 | 21.67 | b | 38.93 | 54.84 | 61.00 | 66.03 | a | 66.23 | 54.36 | a | 39.74 | 34.20 | 14.95 | a | 38.46 | |||||||||
2002 | 10.68 | a | 17.89 | 12.98 | 36.00 | 45.85 | 64.00 | 68.81 | 63.71 | 56.35 | 32.35 | 23.48 | 17.79 | 37.49 | ||||||||||||
2003 | 6.45 | 1.30 | 17.29 | 40.90 | a | 53.94 | 62.45 | 67.68 | 69.18 | 56.37 | 46.35 | 20.22 | 17.35 | 38.29 | ||||||||||||
2004 | -3.66 | 12.02 | 23.42 | 39.87 | 47.10 | 59.10 | 65.00 | 58.71 | 58.07 | 43.08 | 33.83 | a | 11.60 | 37.34 | ||||||||||||
2005 | -1.11 | 10.45 | 18.94 | 45.92 | 50.48 | 63.85 | 67.97 | 64.82 | 59.10 | 44.89 | 29.43 | 16.73 | 39.29 | |||||||||||||
2006 | 20.02 | 5.29 | 20.52 | 47.52 | 54.85 | 65.95 | 71.24 | 66.39 | 56.70 | 40.39 | 25.65 | 17.31 | 40.98 | |||||||||||||
2007 | 8.65 | 1.02 | 24.24 | 39.70 | 54.73 | 64.38 | 69.94 | 63.42 | 55.86 | a | 45.82 | 27.62 | 4.77 | a | 38.34 | |||||||||||
2008 | 3.55 | a | 2.24 | 19.84 | 38.68 | 49.63 | 61.68 | 66.24 | 65.97 | 56.47 | 44.60 | 27.23 | -0.08 | a | 36.34 | |||||||||||
2009 | -1.85 | 7.18 | 17.11 | 37.53 | 48.82 | 61.25 | 63.50 | a | 63.31 | 63.10 | 38.82 | 35.57 | 6.05 | 36.70 | ||||||||||||
2010 | 6.90 | 5.80 | 30.39 | 48.75 | 54.27 | 62.29 | a | 68.74 | 67.61 | 53.12 | 48.35 | 26.52 | 7.76 | 40.04 | ||||||||||||
2011 | 0.84 | 8.20 | 18.55 | 40.02 | 51.00 | 61.52 | 69.80 | a | 67.84 | c | 58.30 | 47.52 | 29.48 | 19.63 | 39.39 | |||||||||||
2012 | 14.92 | 17.48 | 34.24 | 43.70 | 54.97 | 64.24 | a | 71.74 | 66.47 | 55.78 | 40.68 | 22.58 | 8.29 | 41.26 | ||||||||||||
2013 | 4.81 | 7.04 | 12.02 | 26.53 | 51.73 | 64.18 | 67.10 | 66.29 | 59.15 | 41.65 | 23.83 | -1.89 | 35.20 | |||||||||||||
2014 | -1.39 | -0.59 | 13.20 | a | 33.35 | d | 51.76 | 63.25 | 65.24 | 66.16 | 57.03 | a | 45.33 | b | 18.68 | 13.28 | d | 35.44 | ||||||||
2015 | 10.27 | a | 0.25 | 27.77 | 42.18 | 52.71 | b | 63.92 | 69.42 | 65.84 | b | 61.13 | 46.23 | 31.75 | 18.57 | d | 40.84 | |||||||||
2016 | 8.33 | a | 17.09 | 30.78 | a | 36.20 | b | 56.22 | f | 63.25 | 66.90 | 66.57 | b | 57.90 | 43.98 | 39.34 | a | 10.15 | 40.05 | a | ||||||
2017 | 9.68 | a | 14.98 | b | 19.62 | a | 40.82 | 53.60 | a | 64.42 | 68.06 | 64.29 | 57.75 | 45.60 | b | 21.92 | 11.47 | 39.35 | ||||||||
2018 | 8.90 | 4.62 | 23.60 | 33.27 | 59.57 | b | 67.68 | 68.76 | 67.31 | 53.28 | 36.59 | b | 17.78 | 14.92 | 38.02 | |||||||||||
2019 | 1.52 | -5.64 | 18.32 | 39.97 | 48.89 | 63.08 | 69.06 | 64.92 | 56.93 | 37.97 | 23.47 | a | 11.27 | 35.81 | ||||||||||||
2020 | 8.53 | a | 9.68 | a | 24.35 | a | 34.97 | 51.98 | 66.15 | 70.10 | 66.27 | 55.62 | 37.37 | a | 27.09 | a | 19.95 | 39.34 | ||||||||
2021 | 15.42 | 1.89 | 31.74 | 38.50 | 51.60 | 68.42 | 71.74 | 65.89 | 61.50 | a | 48.98 | a | 28.62 | 12.32 | a | 41.38 | ||||||||||
2022 | -0.11 | -0.84 | 19.18 | a | 30.83 | 52.37 | 65.00 | 68.35 | 65.94 | 57.88 | 44.63 | 24.95 | 6.16 | 36.20 | ||||||||||||
2023 | 8.53 | 6.12 | 10.47 | 30.82 | 59.33 | b | 69.54 | b | 65.48 | 65.61 | 60.75 | 44.39 | 28.90 | 23.48 | 39.45 | |||||||||||
2024 | 9.66 | 22.93 | 22.90 | 41.75 | f | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 18.50 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 3.85 | 8.30 | 22.05 | 39.35 | 53.90 | 63.43 | 68.37 | 66.30 | 56.34 | 43.75 | 25.88 | 10.89 | 38.45 | |||||||||||||
S.D. | 7.40 | 7.32 | 6.08 | 4.76 | 3.67 | 3.06 | 2.64 | 2.82 | 3.00 | 3.92 | 5.57 | 6.61 | 1.92 | |||||||||||||
SKEW | -0.12 | 0.07 | 0.16 | -0.16 | 0.23 | 0.04 | -0.01 | -0.12 | 0.13 | 0.10 | -0.18 | -0.07 | -0.28 | |||||||||||||
MAX | 20.02 | 26.74 | 34.70 | 49.40 | 66.24 | 71.28 | 74.69 | 72.87 | 64.18 | 56.39 | 39.34 | 23.61 | 42.39 | |||||||||||||
MIN | -11.56 | -13.21 | 10.47 | 26.53 | 45.85 | 56.20 | 60.16 | 58.71 | 48.15 | 32.35 | 11.67 | -4.72 | 33.43 | |||||||||||||
YRS | 83 | 87 | 85 | 83 | 85 | 85 | 85 | 87 | 88 | 88 | 85 | 87 | 72 |