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 | ----- | 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 | 51.38 | f | ----- | z | ----- | z | ----- | z | 27.90 | a | 15.67 | 13.42 | 19.00 | i | ||
1940 | 8.23 | 8.66 | 26.77 | 34.87 | 42.74 | 50.07 | 52.69 | b | 51.32 | 46.63 | 32.55 | 20.23 | 9.94 | 32.06 | ||||||||||||
1941 | 1.74 | 11.68 | 25.84 | 33.03 | 42.48 | 45.30 | 53.60 | a | 53.39 | 40.00 | 35.35 | 21.23 | 18.90 | 31.88 | ||||||||||||
1942 | 2.52 | 12.29 | 21.16 | 33.87 | 38.39 | 45.67 | 52.42 | 49.26 | 39.53 | 33.03 | 20.52 | a | 11.19 | 29.99 | ||||||||||||
1943 | 10.19 | 13.32 | 23.68 | c | 34.36 | e | 38.27 | a | 45.93 | 51.23 | 53.45 | 40.13 | 29.80 | a | 17.20 | 16.37 | a | 31.16 | ||||||||
1944 | -7.13 | -2.04 | a | 15.32 | 31.50 | 41.55 | 42.93 | a | 49.58 | 46.06 | 38.03 | 30.58 | 21.37 | 6.67 | a | 26.20 | ||||||||||
1945 | 10.29 | 18.57 | 21.19 | 25.23 | 37.37 | a | 42.13 | 51.81 | 52.74 | 37.57 | 30.45 | 14.47 | 4.94 | 28.90 | ||||||||||||
1946 | -0.74 | 7.21 | 22.97 | 36.73 | 37.55 | 44.57 | 54.23 | 50.19 | 37.97 | 30.68 | 24.36 | b | 18.39 | 30.34 | ||||||||||||
1947 | 0.94 | 16.39 | 23.32 | 30.53 | 40.52 | 44.38 | a | 47.68 | 50.10 | 40.36 | b | 32.87 | 16.60 | 5.37 | a | 29.09 | ||||||||||
1948 | -2.45 | 2.93 | 18.81 | 29.53 | 35.26 | 44.93 | 49.13 | 48.41 | d | 40.37 | 27.77 | 14.57 | 3.84 | 26.09 | ||||||||||||
1949 | -11.90 | -12.19 | a | 23.90 | 31.90 | 39.70 | a | 45.77 | 49.81 | 46.26 | 39.39 | g | 29.68 | 20.23 | 0.77 | 23.99 | a | |||||||||
1950 | -10.65 | -7.37 | a | 18.45 | 30.17 | 33.48 | 40.53 | 49.00 | 44.55 | 42.73 | 27.52 | 18.27 | 18.68 | 25.45 | ||||||||||||
1951 | 2.00 | 14.29 | 20.33 | a | 31.27 | 41.60 | a | 44.93 | 52.42 | 49.61 | 36.40 | 31.81 | 19.37 | 5.06 | 29.09 | |||||||||||
1952 | -7.84 | -8.41 | 12.32 | 31.43 | 41.16 | 45.50 | 51.03 | a | 50.90 | 39.43 | 23.97 | 10.70 | 3.13 | 24.44 | ||||||||||||
1953 | -0.10 | 5.82 | 21.52 | 27.97 | 35.00 | 43.17 | 52.30 | d | 45.48 | 37.80 | 28.29 | 20.67 | 8.71 | 27.22 | ||||||||||||
1954 | 10.55 | 18.29 | 20.97 | 29.27 | 39.81 | 41.87 | 56.52 | 46.32 | 43.67 | 30.87 | 21.87 | 1.74 | 30.14 | |||||||||||||
1955 | -5.45 | -7.43 | 13.97 | 27.03 | 37.35 | 43.77 | 50.42 | 52.10 | 37.93 | 26.23 | 13.63 | 16.10 | 25.47 | |||||||||||||
1956 | 16.81 | 7.90 | 16.97 | a | 29.41 | a | 40.32 | 44.97 | 50.65 | 45.41 | b | 37.56 | c | 29.35 | 14.70 | -0.42 | 27.80 | |||||||||
1957 | -3.81 | 5.68 | 24.55 | 31.67 | 39.35 | 45.90 | a | 51.45 | 51.65 | 35.80 | 32.40 | a | 19.70 | 11.94 | 28.86 | |||||||||||
1958 | 7.10 | 21.32 | 24.94 | 26.07 | 40.00 | 46.21 | a | 48.30 | h | 51.19 | 41.00 | 26.13 | 17.18 | b | 12.83 | a | 28.54 | a | ||||||||
1959 | 8.97 | 10.82 | 19.87 | 28.13 | 36.29 | 46.37 | 48.06 | 48.77 | 40.27 | 29.68 | 15.63 | 11.55 | 28.70 | |||||||||||||
1960 | -0.16 | -5.10 | 19.65 | 30.47 | 38.87 | 46.33 | 50.87 | 45.84 | 43.59 | a | 30.90 | 20.20 | 8.13 | 27.46 | ||||||||||||
1961 | 2.29 | 15.25 | 23.10 | 30.50 | 40.06 | 49.21 | a | 52.55 | 52.97 | 38.47 | 29.39 | 18.66 | a | 6.39 | 29.90 | |||||||||||
1962 | -4.39 | 13.86 | 16.74 | 31.20 | 38.84 | 46.50 | b | 51.61 | 46.65 | 40.40 | 30.20 | a | 19.27 | 7.03 | 28.16 | |||||||||||
1963 | -1.84 | 15.11 | 18.74 | 31.59 | a | 42.48 | 46.13 | 52.84 | 55.15 | e | 45.07 | b | 35.68 | 21.17 | 4.07 | a | 30.52 | |||||||||
1964 | 2.74 | 7.62 | 15.42 | 30.93 | 38.66 | b | 47.03 | a | 54.03 | 48.77 | 37.47 | 28.19 | 13.47 | 4.30 | a | 27.39 | ||||||||||
1965 | 1.10 | 2.93 | 13.00 | 32.87 | 38.48 | 44.80 | 52.61 | 47.36 | c | 35.07 | a | 28.00 | 24.50 | 10.65 | 27.61 | |||||||||||
1966 | 0.42 | 6.21 | 18.06 | 26.53 | 37.55 | 43.57 | 52.77 | 47.74 | 41.57 | 27.03 | 23.93 | -0.61 | 27.07 | |||||||||||||
1967 | -3.48 | 0.64 | 23.74 | 29.63 | 37.68 | 46.37 | 53.84 | 50.42 | 41.17 | 27.74 | 17.63 | -0.42 | 27.08 | |||||||||||||
1968 | -10.48 | 10.59 | 21.68 | 26.53 | 36.52 | 46.34 | a | 52.52 | 47.16 | 37.40 | 28.03 | 19.13 | 2.55 | 26.50 | ||||||||||||
1969 | 8.26 | 7.46 | 13.23 | 32.20 | 42.81 | 49.13 | 52.29 | 53.00 | 43.77 | 27.32 | 17.83 | 9.35 | 29.72 | |||||||||||||
1970 | 2.61 | 17.39 | 20.71 | 23.77 | 37.81 | 46.27 | 51.06 | 49.69 | e | 34.96 | b | 26.11 | c | 20.87 | 6.60 | a | 28.15 | |||||||||
1971 | 8.13 | 14.25 | 16.48 | 26.29 | b | 37.16 | 44.48 | c | 50.42 | 51.52 | 35.73 | 26.46 | c | 14.93 | 4.94 | 27.57 | ||||||||||
1972 | 9.53 | a | 12.00 | 22.84 | 30.90 | 38.16 | 51.30 | 51.81 | 49.16 | 40.17 | 34.36 | c | 22.73 | -1.84 | 30.09 | |||||||||||
1973 | -13.28 | b | -1.75 | 21.84 | 30.67 | 37.55 | 44.30 | 50.77 | 47.57 | c | 38.70 | 27.45 | b | 18.80 | 6.10 | 25.73 | ||||||||||
1974 | -8.61 | -6.86 | 23.81 | 27.27 | 37.29 | 46.67 | 53.61 | 45.68 | 37.07 | 33.61 | 20.67 | 8.07 | a | 26.52 | ||||||||||||
1975 | 2.39 | 9.75 | 24.29 | 27.23 | 35.87 | 41.17 | 54.52 | 44.88 | g | 38.27 | 26.48 | 15.77 | 5.52 | 25.57 | a | |||||||||||
1976 | -1.90 | 9.45 | 18.39 | 29.90 | 39.71 | 41.53 | 53.68 | 47.19 | 43.03 | 24.71 | 13.97 | 4.84 | 27.04 | |||||||||||||
1977 | 4.68 | 14.00 | 17.87 | 32.07 | 38.32 | 49.03 | 52.97 | 51.74 | 41.17 | 26.89 | c | 17.80 | 15.16 | 30.14 | ||||||||||||
1978 | 12.19 | 9.69 | b | 26.45 | 32.70 | c | 36.81 | 45.17 | 50.97 | 48.67 | d | 38.07 | 29.61 | 19.93 | -5.29 | 28.75 | ||||||||||
1979 | -8.90 | -0.50 | 18.77 | 26.36 | p | 40.16 | 44.03 | 50.39 | 48.52 | 41.37 | c | 31.13 | 15.13 | 8.23 | 26.21 | a | ||||||||||
1980 | 14.13 | 12.59 | 23.74 | 29.77 | 40.65 | 43.73 | 52.47 | a | 47.07 | c | 37.11 | k | 30.00 | 17.97 | a | 15.77 | 29.81 | a | ||||||||
1981 | 11.94 | 13.75 | 26.39 | 34.67 | 42.29 | 48.17 | a | 52.74 | 51.26 | 46.40 | 34.29 | 23.53 | 16.77 | 33.52 | ||||||||||||
1982 | 0.07 | a | 11.50 | 24.81 | e | 25.57 | 39.97 | 43.83 | 53.42 | 54.52 | h | 47.57 | 29.23 | e | 19.70 | 12.53 | a | 28.02 | a | |||||||
1983 | 11.55 | 14.25 | 27.68 | 27.43 | b | 37.94 | 48.07 | 54.00 | 56.90 | 45.60 | 34.65 | 21.73 | 6.52 | 32.19 | ||||||||||||
1984 | -7.52 | -4.31 | 19.71 | 30.60 | 41.35 | 46.37 | 56.16 | 54.00 | 42.60 | 31.00 | a | 17.33 | 7.19 | 27.87 | ||||||||||||
1985 | -5.03 | -7.15 | a | 18.26 | 33.33 | 42.00 | 47.73 | 55.26 | 49.20 | a | 40.14 | a | 32.97 | a | 22.50 | 5.26 | 27.87 | |||||||||
1986 | 1.83 | a | 21.04 | 28.97 | a | 33.60 | 38.84 | 50.62 | a | 53.13 | 52.19 | 41.68 | b | 32.70 | a | 21.73 | 11.59 | b | 32.33 | |||||||
1987 | 7.50 | a | 18.78 | a | 21.87 | 30.30 | 43.17 | b | 47.80 | 52.29 | 48.59 | b | 38.70 | 32.81 | 23.67 | 10.06 | 31.29 | |||||||||
1988 | -5.48 | 4.24 | 21.43 | a | 30.61 | b | 38.87 | 51.10 | a | 53.90 | a | 49.89 | c | 39.87 | 32.03 | b | 20.03 | a | 5.93 | a | 28.54 | |||||
1989 | -8.06 | -0.18 | 22.84 | 32.13 | 39.77 | a | 46.87 | 54.55 | 50.60 | a | 40.69 | a | 31.47 | a | 20.24 | a | 10.00 | 28.41 | ||||||||
1990 | 11.35 | 9.44 | a | 26.90 | a | 35.73 | 39.30 | a | 47.33 | 53.68 | c | 48.53 | a | 47.41 | a | 30.03 | 20.33 | -3.23 | 30.57 | |||||||
1991 | -2.94 | 6.67 | a | 23.00 | a | 29.37 | c | 39.03 | b | 46.07 | a | 51.93 | b | 51.29 | 41.90 | a | 29.06 | 20.53 | 10.00 | 28.83 | ||||||
1992 | 0.65 | 16.03 | 25.94 | 33.63 | 42.83 | a | 47.21 | a | 49.97 | 50.27 | a | 41.46 | b | 32.00 | a | 20.33 | 2.58 | 30.24 | ||||||||
1993 | 2.29 | 8.79 | 19.39 | 31.23 | 41.10 | a | 45.34 | a | 46.16 | 48.63 | a | 38.67 | 32.45 | 15.83 | 11.13 | 28.42 | ||||||||||
1994 | 9.74 | 12.36 | 24.10 | 33.97 | 40.87 | a | 48.07 | a | 52.52 | 52.03 | a | 41.57 | 34.13 | 18.60 | 17.00 | 32.08 | ||||||||||
1995 | 18.06 | 20.04 | a | 27.00 | 30.43 | 39.33 | a | 45.50 | 49.52 | 51.68 | 42.37 | 27.13 | a | 19.03 | 11.61 | 31.81 | ||||||||||
1996 | 6.77 | a | 14.14 | 22.70 | a | 29.20 | 40.23 | 46.67 | 53.61 | 48.71 | 40.53 | 28.65 | 21.70 | 14.42 | 30.61 | |||||||||||
1997 | 6.26 | 7.32 | 20.29 | 29.47 | 42.00 | 50.73 | 52.48 | 54.69 | b | 49.48 | a | 32.32 | 22.66 | a | 11.97 | 31.64 | ||||||||||
1998 | 17.42 | 24.96 | 25.10 | a | 32.07 | 42.10 | a | 46.57 | 57.68 | 53.84 | 48.03 | a | 35.03 | 24.97 | a | 4.90 | 34.39 | |||||||||
1999 | 13.03 | 20.29 | 24.03 | 33.23 | 40.39 | 47.83 | a | 56.90 | 55.39 | 41.70 | c | 27.13 | 17.93 | a | 9.90 | a | 32.31 | |||||||||
2000 | 16.03 | 21.97 | 25.52 | 33.48 | a | 41.13 | 47.87 | 52.42 | 56.13 | a | 42.07 | b | 34.77 | 17.48 | a | 13.40 | a | 33.52 | ||||||||
2001 | 10.00 | 18.32 | 27.81 | 34.33 | 41.84 | 47.73 | 54.71 | 54.48 | 43.97 | 31.94 | 24.03 | 0.48 | 32.47 | |||||||||||||
2002 | 1.16 | 5.68 | 18.45 | 30.13 | 38.42 | 47.57 | 54.97 | a | 48.59 | b | 43.50 | 29.29 | 17.76 | a | 11.63 | a | 28.93 | |||||||||
2003 | 9.48 | 15.93 | 25.26 | 32.17 | 41.97 | 49.37 | c | 55.39 | 54.00 | 39.59 | a | 30.61 | 18.20 | 13.10 | 32.09 | |||||||||||
2004 | 0.84 | 6.66 | 23.77 | a | 34.87 | 41.23 | 47.23 | 51.58 | 48.74 | 42.47 | 35.00 | 25.17 | 12.57 | a | 30.84 | |||||||||||
2005 | 20.19 | 19.61 | 24.33 | a | 30.72 | a | 40.87 | a | 47.50 | 53.33 | a | 51.39 | 41.79 | a | 35.55 | 23.23 | 11.10 | 33.30 | ||||||||
2006 | 13.19 | 14.71 | 23.90 | 32.80 | 41.06 | 50.87 | 58.19 | 52.06 | 39.80 | 34.03 | 21.50 | 9.19 | 32.61 | |||||||||||||
2007 | -10.55 | 12.17 | j | 26.06 | 34.03 | 42.35 | 49.63 | 58.06 | 54.90 | 44.80 | 32.74 | 20.03 | -0.81 | 31.93 | a | |||||||||||
2008 | -8.97 | 2.97 | 20.94 | 28.07 | a | 39.03 | b | 47.27 | 56.13 | a | 53.24 | b | 42.10 | 32.29 | 23.87 | 7.48 | 28.70 | |||||||||
2009 | 1.16 | 14.14 | 24.71 | 32.77 | 44.65 | 48.80 | 56.26 | 50.94 | 45.48 | a | 32.23 | a | 19.43 | -4.06 | 30.54 | |||||||||||
2010 | -1.43 | a | 4.54 | 23.55 | b | 32.57 | 37.61 | 50.30 | 56.65 | 52.19 | 41.53 | 36.19 | 21.30 | 22.19 | 31.43 | |||||||||||
2011 | -3.45 | 1.25 | 25.14 | b | 33.57 | 39.42 | 47.83 | 57.63 | a | 54.97 | b | 46.72 | a | 33.45 | 20.87 | 9.62 | b | 30.58 | ||||||||
2012 | 10.13 | a | 17.41 | 25.65 | 34.07 | a | 42.37 | a | 49.90 | a | 56.84 | 54.10 | 44.48 | a | 32.26 | 21.57 | 8.94 | 33.14 | ||||||||
2013 | -11.77 | 0.39 | 21.94 | 30.00 | 40.68 | i | 45.63 | 56.10 | 51.72 | b | 46.10 | a | 29.21 | b | 19.81 | d | -9.54 | e | 25.42 | a | ||||||
2014 | -2.72 | b | 14.88 | c | 23.00 | 29.90 | 39.23 | 47.47 | 56.97 | 53.23 | 45.23 | 32.00 | a | 19.64 | h | 18.42 | e | 32.51 | a | |||||||
2015 | 15.67 | a | 19.21 | 25.70 | d | 35.00 | s | 42.55 | 52.13 | 54.23 | 52.61 | 44.00 | 37.65 | 20.40 | 2.66 | b | 33.35 | a | ||||||||
2016 | 2.45 | b | 10.79 | 26.23 | a | 34.82 | b | 39.32 | 49.46 | b | 52.00 | a | 49.19 | 43.52 | a | 31.96 | d | 24.23 | 13.31 | b | 31.44 | |||||
2017 | 6.87 | a | 18.79 | 28.74 | 31.57 | b | 36.57 | a | 47.17 | g | 55.42 | 50.81 | 43.87 | 25.32 | 21.00 | 9.29 | 29.84 | a | ||||||||
2018 | 10.52 | 14.61 | 23.55 | 31.57 | b | 42.70 | a | 48.87 | 57.42 | 51.87 | 41.03 | 32.84 | 15.44 | c | 9.29 | 31.64 | ||||||||||
2019 | 1.13 | -2.07 | 21.68 | 32.93 | 37.16 | 44.60 | 53.90 | 50.77 | 41.27 | 19.97 | 15.93 | a | 15.03 | 27.69 | ||||||||||||
2020 | 2.87 | 8.10 | 26.63 | a | 29.50 | 41.23 | 48.83 | 51.97 | a | 50.94 | 39.07 | 25.90 | 17.57 | 2.97 | a | 28.80 | ||||||||||
2021 | -0.53 | a | 11.46 | 22.84 | 24.67 | x | 43.54 | g | 50.70 | 59.55 | 51.68 | 44.97 | 33.68 | 24.03 | 14.55 | 31.29 | b | |||||||||
2022 | 13.81 | 11.21 | 24.94 | 30.70 | 38.32 | 50.41 | a | 58.90 | 56.13 | 47.47 | 32.74 | 19.13 | 6.03 | 32.48 | ||||||||||||
2023 | 5.52 | -6.14 | 16.06 | 29.00 | 42.77 | 49.33 | 56.42 | 55.52 | 44.13 | 31.74 | 21.00 | 13.16 | 29.88 | |||||||||||||
2024 | 14.06 | 22.93 | 26.87 | 31.61 | g | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 21.29 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 2.94 | 9.30 | 22.22 | 30.95 | 39.67 | 46.74 | 53.22 | 50.69 | 41.48 | 30.57 | 19.50 | 8.29 | 29.60 | |||||||||||||
S.D. | 8.14 | 8.48 | 3.80 | 2.64 | 2.21 | 2.53 | 2.68 | 2.90 | 3.26 | 3.21 | 3.07 | 6.08 | 2.29 | |||||||||||||
SKEW | 0.00 | -0.55 | -0.63 | -0.38 | -0.23 | -0.14 | 0.10 | -0.01 | 0.22 | -0.40 | -0.34 | -0.31 | -0.05 | |||||||||||||
MAX | 20.19 | 24.96 | 28.97 | 36.73 | 44.65 | 52.13 | 59.55 | 56.90 | 49.48 | 37.65 | 25.17 | 22.19 | 34.39 | |||||||||||||
MIN | -13.28 | -12.19 | 12.32 | 23.77 | 33.48 | 40.53 | 46.16 | 44.55 | 34.96 | 19.97 | 10.70 | -9.54 | 24.44 | |||||||||||||
YRS | 85 | 84 | 85 | 81 | 82 | 83 | 83 | 82 | 82 | 85 | 84 | 85 | 72 |