YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
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 | 63.29 | g | 65.10 | o | 46.00 | j | ----- | z | 11.78 | m | ----- | z |
1928 | 9.75 | c | 11.89 | f | 24.57 | a | 35.37 | c | 55.79 | b | 57.94 | c | 66.33 | s | 63.58 | a | 51.72 | c | 41.36 | c | 30.04 | c | -1.71 | s | 41.12 | c |
1929 | -10.03 | b | 1.37 | b | 27.96 | c | 40.74 | c | 49.50 | f | 61.67 | d | 69.02 | e | 65.91 | b | 51.62 | a | 43.15 | g | 20.79 | f | 9.65 | a | 35.32 | c |
1930 | -4.12 | g | 18.54 | d | 23.58 | a | 43.98 | c | 51.00 | d | 62.35 | f | 70.34 | o | 68.16 | b | 53.84 | b | 41.67 | d | 26.23 | b | 15.69 | b | 38.08 | c |
1931 | 14.85 | a | 23.00 | 25.18 | 42.76 | a | 50.67 | a | 65.57 | c | 66.98 | e | 63.81 | b | 60.40 | a | 47.30 | d | 28.70 | b | 18.45 | a | 42.30 | |||
1932 | 7.96 | d | 10.02 | b | 5.69 | w | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 8.99 | j |
1933 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 58.04 | q | ----- | z | 9.10 | y | ----- | z | ----- | z |
1934 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1935 | 2.36 | q | 22.27 | f | 27.76 | h | ----- | 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 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 72.81 | w | 70.54 | c | 56.40 | a | 39.83 | a | 18.37 | 21.84 | 41.39 | g | ||
1960 | 7.29 | b | 10.78 | 15.81 | 40.20 | 54.13 | 61.32 | 67.34 | 67.81 | 56.67 | 46.13 | 29.13 | 10.71 | b | 38.94 | |||||||||||
1961 | 5.39 | ----- | z | 33.44 | 35.53 | 51.90 | 64.12 | i | 65.79 | q | 67.55 | i | 53.80 | e | 47.00 | 28.98 | 7.66 | b | 32.96 | d | ||||||
1962 | -1.50 | c | 5.69 | a | 23.72 | b | 38.45 | 54.58 | 64.38 | 66.02 | 67.92 | 54.82 | 48.66 | 33.72 | 14.38 | a | 39.24 | |||||||||
1963 | -0.10 | a | 7.38 | 30.56 | 43.92 | 51.69 | 68.30 | 70.23 | a | 67.62 | a | 61.08 | 56.03 | 31.71 | a | 6.60 | a | 41.25 | ||||||||
1964 | 12.66 | 15.71 | 18.42 | a | 43.31 | a | 58.45 | a | 63.35 | 71.72 | b | 63.37 | 55.20 | 45.44 | 29.43 | 4.93 | a | 40.17 | ||||||||
1965 | -1.06 | d | 5.98 | 12.13 | 41.75 | 54.65 | 62.41 | a | 66.81 | 65.58 | 48.95 | 45.74 | d | 26.30 | 20.24 | 37.46 | ||||||||||
1966 | -8.22 | a | 5.45 | 28.42 | a | 36.68 | 51.48 | 64.24 | a | 71.61 | 64.97 | 58.58 | 44.62 | a | 23.62 | 11.53 | a | 37.75 | ||||||||
1967 | 7.81 | 1.30 | 24.27 | 39.07 | 48.30 | a | 61.52 | 66.29 | 66.06 | 59.27 | 43.26 | 28.76 | a | 14.26 | 38.35 | |||||||||||
1968 | 5.02 | 5.72 | 33.27 | 43.22 | 50.10 | 63.03 | 66.32 | 65.92 | 57.40 | 45.77 | a | 30.20 | 9.63 | 39.63 | ||||||||||||
1969 | -1.08 | 11.61 | 15.93 | a | 44.92 | 55.16 | 57.37 | 67.15 | 70.71 | 58.83 | 39.97 | a | 29.40 | a | 15.13 | 38.76 | ||||||||||
1970 | -1.03 | 8.14 | 15.69 | 38.62 | 53.27 | 67.65 | 70.74 | 68.16 | 59.72 | 45.50 | 25.85 | 7.53 | a | 38.32 | ||||||||||||
1971 | -4.82 | a | 10.00 | 23.26 | 42.93 | 52.71 | 67.17 | 64.11 | 66.56 | 57.80 | 47.63 | 27.67 | 12.41 | b | 38.95 | |||||||||||
1972 | -1.00 | 2.22 | 21.40 | 38.72 | 58.85 | 65.43 | 65.66 | 68.44 | 54.73 | 42.39 | 26.17 | 3.29 | 37.19 | |||||||||||||
1973 | 10.42 | 15.36 | 37.05 | 41.83 | 54.02 | 64.05 | 66.55 | 70.73 | g | 56.05 | 51.40 | 26.10 | 10.77 | 39.42 | a | |||||||||||
1974 | 0.47 | 10.50 | 20.79 | 40.85 | 51.21 | 63.95 | 72.44 | 63.87 | 53.73 | 47.40 | 30.33 | 19.58 | 39.59 | |||||||||||||
1975 | 8.84 | 8.96 | 16.53 | 36.00 | 56.92 | 63.10 | 71.34 | 66.76 | 53.81 | a | 48.34 | 31.15 | 13.87 | 39.64 | ||||||||||||
1976 | 5.89 | 20.12 | 22.05 | 46.42 | 55.55 | 66.97 | 68.56 | 71.13 | 59.60 | 39.24 | 23.10 | 4.78 | a | 40.28 | ||||||||||||
1977 | -5.43 | a | 14.32 | 32.00 | 48.82 | 66.74 | 65.15 | 71.00 | 61.26 | 57.20 | 45.98 | 24.53 | 5.81 | 40.61 | ||||||||||||
1978 | -2.39 | 1.80 | 21.11 | 42.00 | 59.48 | 63.32 | 68.24 | 68.18 | 62.30 | 46.03 | 22.17 | 4.32 | 38.05 | |||||||||||||
1979 | -6.45 | -1.00 | 20.38 | a | 35.13 | 48.26 | 62.45 | a | 67.92 | 63.16 | 58.39 | b | 42.21 | 24.62 | 20.33 | b | 36.28 | |||||||||
1980 | 5.72 | a | 7.12 | 18.90 | 48.20 | 60.60 | 64.68 | 69.68 | 64.95 | 55.97 | 42.00 | 32.25 | 12.15 | 40.18 | ||||||||||||
1981 | 12.37 | 19.55 | 33.45 | 45.08 | 55.39 | 61.95 | 69.47 | 68.39 | 57.17 | 44.11 | 36.13 | 11.50 | 42.88 | |||||||||||||
1982 | -6.34 | 10.20 | 22.77 | 40.07 | a | 57.13 | a | 58.05 | a | 68.75 | a | 66.68 | 57.27 | 47.05 | 23.64 | a | 20.42 | 38.81 | ||||||||
1983 | 13.98 | 21.52 | 30.63 | 41.28 | 51.61 | 64.20 | 72.05 | 72.77 | 57.88 | a | 44.88 | a | 30.93 | b | -1.66 | 41.67 | ||||||||||
1984 | 7.26 | 24.97 | 23.44 | 44.80 | 53.19 | 64.90 | 69.03 | a | 70.71 | 53.07 | b | 47.58 | 29.00 | a | 10.32 | c | 41.52 | |||||||||
1985 | 4.25 | a | 8.66 | 31.98 | a | 46.42 | 58.83 | a | 59.52 | c | 66.95 | 63.13 | 53.50 | 45.10 | b | 15.88 | 0.90 | 37.93 | ||||||||
1986 | 14.03 | b | 9.70 | 30.56 | 44.37 | 56.88 | b | 65.93 | a | 70.42 | 64.35 | 55.53 | 45.98 | 22.12 | 19.76 | 41.64 | ||||||||||
1987 | 17.26 | b | 26.95 | 31.43 | a | 51.43 | a | 61.18 | 67.27 | 71.08 | 66.29 | b | 59.30 | 42.69 | 32.38 | 18.55 | 45.48 | |||||||||
1988 | 5.03 | a | 6.85 | b | 27.87 | 44.17 | 63.32 | 70.58 | 72.29 | 70.40 | a | 57.75 | 42.11 | 26.98 | a | 13.26 | b | 41.72 | ||||||||
1989 | 10.58 | a | -0.54 | a | 18.74 | 40.83 | 57.67 | b | 61.26 | a | 72.44 | 68.65 | 57.67 | 44.82 | a | 22.63 | 3.40 | 38.18 | ||||||||
1990 | 20.02 | 16.89 | 30.71 | 41.67 | 53.98 | a | 65.23 | 67.15 | 69.53 | 61.45 | 44.50 | 31.63 | 10.11 | 42.74 | ||||||||||||
1991 | 3.24 | 19.02 | 29.89 | 45.83 | 60.05 | 67.90 | 68.37 | 70.60 | 57.35 | 40.82 | 23.52 | a | 19.50 | 42.17 | ||||||||||||
1992 | 16.35 | a | 21.53 | 31.58 | 40.28 | 59.06 | 60.68 | 61.70 | a | 63.07 | a | 55.02 | b | 43.65 | 25.29 | a | 8.88 | a | 40.59 | |||||||
1993 | 6.28 | b | 7.95 | 24.81 | b | 41.72 | 55.24 | 61.48 | 64.95 | a | 66.61 | 53.47 | 43.23 | 24.60 | a | 13.79 | b | 38.68 | ||||||||
1994 | -4.43 | a | 4.40 | b | 29.02 | 42.88 | 58.91 | c | 65.65 | 65.73 | a | 65.43 | b | 61.02 | a | 49.62 | b | 32.84 | a | 21.53 | 41.05 | |||||
1995 | 9.05 | a | 9.66 | 26.38 | b | 36.79 | a | 54.29 | 70.37 | 67.62 | a | 69.98 | a | 57.76 | a | 43.98 | a | 19.82 | 9.32 | 39.59 | ||||||
1996 | 0.64 | i | 10.92 | c | 17.67 | b | 35.33 | c | 54.68 | c | 67.62 | a | 68.65 | a | 71.47 | 60.20 | b | 47.23 | 21.16 | e | 6.88 | f | 45.49 | b | ||
1997 | 3.88 | f | 14.75 | d | 20.72 | a | 38.60 | a | 51.42 | a | 68.07 | 68.18 | a | 66.60 | 62.30 | 48.80 | a | 23.47 | 22.79 | 44.15 | a | |||||
1998 | 12.88 | c | 29.86 | 26.45 | 48.38 | 61.09 | c | 59.98 | e | 71.18 | c | 71.47 | 61.84 | b | 40.35 | d | 26.10 | f | 17.39 | d | 45.53 | a | ||||
1999 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2000 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2001 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2002 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2003 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2004 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 38.92 | a | ----- | z | ----- | z | 38.92 | k |
2010 | 8.56 | 10.95 | 34.56 | 48.78 | a | 55.79 | 62.95 | 69.40 | 69.11 | 53.95 | 48.21 | 28.05 | 9.58 | 41.66 | ||||||||||||
2011 | 1.26 | 11.05 | 21.76 | 40.82 | 53.55 | 64.02 | 72.19 | 68.27 | 56.97 | 49.65 | 31.13 | 21.89 | 41.05 | |||||||||||||
2012 | 16.39 | 18.14 | 40.15 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 47.67 | f | ----- | z | ----- | z | ----- | z | 24.89 | i | |||
2013 | ----- | z | ----- | z | ----- | z | ----- | z | 54.44 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 54.44 | k | |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 12.31 | 12.31 | k | |
2017 | 11.13 | 20.06 | b | 27.82 | 42.77 | 54.00 | 64.43 | 69.52 | 64.56 | 59.53 | 46.67 | a | 24.22 | a | 10.89 | 41.30 | ||||||||||
2018 | 7.63 | 4.08 | c | 26.19 | b | 32.73 | 61.03 | 67.43 | h | 69.45 | ----- | z | ----- | z | ----- | z | 18.88 | v | 17.98 | 31.30 | e | |||||
2019 | 3.74 | b | 1.07 | 18.22 | a | 39.15 | g | 49.79 | ----- | z | 69.97 | b | 64.08 | k | 59.70 | b | 40.90 | b | 25.30 | e | 9.45 | k | 33.58 | d | ||
2020 | 10.89 | 11.03 | 26.40 | 37.40 | 52.21 | 68.53 | 71.94 | 68.24 | d | 55.38 | 38.08 | 32.10 | f | 20.41 | h | 44.01 | b | |||||||||
2021 | 15.37 | d | 6.25 | d | 33.56 | f | 39.77 | 52.50 | 67.52 | 71.26 | ----- | z | ----- | z | 46.96 | g | 31.15 | 9.68 | 36.69 | d | ||||||
2022 | -1.84 | 0.55 | 23.53 | 33.57 | 54.19 | 66.40 | 70.40 | 66.79 | q | 61.12 | 43.10 | 26.80 | 10.56 | 35.31 | a | |||||||||||
2023 | 11.81 | 9.61 | 15.81 | ----- | z | ----- | z | ----- | z | 68.38 | g | 68.79 | ----- | z | ----- | z | 31.77 | ----- | z | 27.56 | g | |||||
2024 | ----- | z | 24.44 | u | 27.42 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 27.42 | k | |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 5.60 | 11.07 | 25.22 | 41.50 | 55.23 | 64.25 | 68.87 | 67.22 | 57.08 | 44.86 | 27.12 | 12.41 | 40.04 | |||||||||||||
S.D. | 7.42 | 7.44 | 6.19 | 4.23 | 3.92 | 3.13 | 2.45 | 2.74 | 3.05 | 3.50 | 4.24 | 6.03 | 1.90 | |||||||||||||
SKEW | -0.21 | 0.51 | 0.09 | 0.06 | 0.58 | -0.17 | -0.52 | -0.06 | -0.29 | 0.42 | -0.33 | -0.11 | 0.41 | |||||||||||||
MAX | 20.02 | 29.86 | 40.15 | 51.43 | 66.74 | 70.58 | 72.44 | 72.77 | 62.30 | 56.03 | 36.13 | 22.79 | 45.48 | |||||||||||||
MIN | -10.03 | -1.00 | 12.13 | 32.73 | 48.26 | 57.37 | 61.70 | 61.26 | 48.95 | 38.08 | 15.88 | -1.66 | 36.28 | |||||||||||||
YRS | 51 | 52 | 53 | 50 | 51 | 47 | 48 | 47 | 50 | 50 | 49 | 49 | 38 |