YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1932 | 18.95 | k | 16.37 | f | 20.19 | d | 42.23 | 55.48 | a | 66.80 | 70.53 | 67.36 | c | 55.59 | h | 43.27 | 27.30 | 10.10 | e | 44.81 | c | |||||
1933 | 18.73 | 8.29 | 26.30 | a | 41.79 | a | 56.00 | 71.22 | c | 72.06 | 65.81 | 63.30 | 42.60 | 26.28 | a | 11.00 | e | 41.95 | ||||||||
1934 | 18.08 | 11.27 | 23.55 | 41.18 | 62.00 | 65.60 | 69.26 | 63.13 | 54.67 | 48.92 | 35.62 | 10.02 | a | 41.94 | ||||||||||||
1935 | 5.31 | 19.41 | 27.30 | a | 39.95 | 49.95 | 59.25 | 73.55 | 66.79 | 57.32 | 47.06 | 25.60 | 15.03 | 40.54 | ||||||||||||
1936 | 2.63 | a | -2.98 | a | 25.73 | 35.22 | 58.92 | 61.02 | 75.32 | 69.15 | 61.42 | 41.20 | a | 27.08 | 19.54 | c | 39.52 | |||||||||
1937 | 2.95 | a | 11.29 | 22.61 | 41.02 | a | 56.19 | 62.32 | 70.68 | a | 72.05 | 58.32 | 42.48 | 28.59 | a | 13.15 | 40.14 | |||||||||
1938 | 8.75 | c | 18.46 | 31.98 | 42.18 | 52.40 | 61.82 | 66.32 | 68.60 | 57.90 | 50.15 | 29.13 | 16.23 | 41.99 | ||||||||||||
1939 | 17.23 | 4.84 | c | 24.65 | 39.12 | 58.84 | 63.92 | 69.50 | 66.50 | 59.02 | 45.31 | 33.84 | e | 26.36 | b | 42.43 | ||||||||||
1940 | 6.35 | a | 18.05 | a | 21.24 | 41.45 | 53.24 | 63.97 | 71.32 | 66.85 | 62.12 | 50.24 | 28.72 | a | 19.32 | 41.91 | ||||||||||
1941 | 13.58 | 14.12 | 23.32 | 49.98 | 61.56 | 65.57 | 70.50 | 67.71 | 60.48 | 48.11 | 34.10 | 24.55 | 44.47 | |||||||||||||
1942 | 18.27 | 18.14 | 33.15 | 50.13 | 54.98 | 64.93 | 69.15 | 68.29 | 55.72 | a | 48.37 | 31.22 | 13.63 | 43.83 | ||||||||||||
1943 | 7.65 | 16.57 | 20.65 | 41.72 | 54.66 | 67.92 | 72.61 | 69.82 | 55.90 | 48.21 | 26.88 | a | 20.56 | 41.93 | ||||||||||||
1944 | 24.60 | 18.93 | 24.63 | 40.73 | 60.47 | 67.75 | 68.84 | 69.68 | 59.88 | 48.94 | 36.98 | 16.87 | 44.86 | |||||||||||||
1945 | 10.34 | 14.74 | a | 36.32 | 42.17 | 50.58 | 59.58 | 67.77 | 68.39 | v | 50.80 | t | 45.92 | 30.72 | 12.90 | 37.10 | b | |||||||||
1946 | 14.24 | 14.48 | 39.48 | 47.70 | 54.47 | 64.90 | 70.87 | 66.89 | 58.70 | 49.39 | 31.70 | 18.02 | 44.24 | |||||||||||||
1947 | 17.92 | 12.80 | 25.68 | 40.17 | 50.85 | 61.53 | 70.39 | 74.82 | 61.10 | 57.34 | 34.94 | v | 17.41 | b | 44.55 | a | ||||||||||
1948 | 7.13 | a | 13.57 | 25.36 | b | 48.07 | 56.94 | 65.14 | a | 71.56 | 70.39 | 64.73 | 47.47 | 33.36 | a | 16.61 | 43.36 | |||||||||
1949 | 14.13 | 12.36 | 25.82 | 43.22 | 58.60 | 68.67 | a | 71.60 | 71.66 | 56.92 | 50.02 | 34.42 | 18.48 | 43.82 | ||||||||||||
1950 | 5.71 | 14.07 | 21.16 | 35.02 | 54.48 | 66.17 | 68.39 | 65.40 | a | 60.20 | 51.42 | 26.67 | 10.47 | 39.93 | ||||||||||||
1951 | 7.82 | 15.50 | 20.32 | 40.58 | 60.08 | 61.77 | 69.48 | 65.19 | 54.90 | 47.23 | 24.20 | 15.55 | 40.22 | |||||||||||||
1952 | 12.65 | 20.12 | 23.40 | 47.27 | 57.10 | 67.73 | 71.13 | 66.44 | 60.25 | 42.66 | 34.05 | 22.52 | 43.78 | |||||||||||||
1953 | 15.27 | 14.00 | a | 27.60 | 39.73 | 56.85 | 67.75 | 70.23 | 69.97 | 60.05 | 54.92 | 37.05 | 20.17 | a | 44.47 | |||||||||||
1954 | 8.71 | 28.07 | 25.68 | 44.75 | 50.37 | 68.53 | 71.10 | 67.53 | 57.95 | 45.74 | 35.23 | 21.11 | 43.73 | |||||||||||||
1955 | 10.68 | 11.61 | 22.82 | 51.30 | 61.06 | 66.23 | 75.97 | 73.27 | 59.93 | 49.39 | 24.53 | 10.73 | 43.13 | |||||||||||||
1956 | 12.35 | 11.67 | 22.77 | 39.90 | a | 55.84 | 69.65 | 67.11 | 68.03 | 56.67 | 53.82 | 31.72 | 19.85 | 42.45 | ||||||||||||
1957 | 5.44 | 16.11 | 26.97 | 44.65 | 55.98 | 64.79 | b | 73.65 | 68.24 | 56.87 | 45.97 | 30.83 | 20.29 | 42.48 | ||||||||||||
1958 | 17.55 | 11.04 | 29.13 | 45.73 | 57.00 | 60.03 | 67.23 | 67.45 | 60.03 | 49.73 | 33.23 | 11.56 | 42.48 | |||||||||||||
1959 | 6.50 | 13.86 | 30.05 | 44.57 | 59.05 | 67.62 | 70.47 | 72.05 | 60.52 | 43.35 | 22.42 | 26.23 | 43.06 | |||||||||||||
1960 | 13.95 | 16.26 | 18.35 | 44.12 | 55.79 | 63.13 | 70.02 | 69.89 | 60.95 | 48.24 | 34.42 | 15.55 | 42.56 | |||||||||||||
1961 | 11.56 | 22.91 | 32.35 | 38.93 | 53.84 | 66.75 | 69.50 | 71.18 | 59.45 | 49.45 | 31.87 | 15.89 | 43.64 | |||||||||||||
1962 | 7.69 | 12.96 | 28.24 | 41.78 | 60.42 | 65.60 | 67.69 | 68.60 | 57.78 | a | 51.06 | 33.93 | 18.55 | 42.86 | ||||||||||||
1963 | 3.29 | 11.27 | 31.42 | 47.08 | 55.39 | 68.90 | 72.69 | 67.95 | 61.62 | 57.50 | 37.65 | 9.47 | 43.69 | |||||||||||||
1964 | 18.37 | 19.22 | 24.92 | 45.25 | 61.15 | 66.48 | 73.47 | 66.82 | 58.27 | 47.35 | 34.60 | 12.32 | 44.02 | |||||||||||||
1965 | 7.47 | 10.12 | 19.08 | 41.03 | 59.27 | 65.03 | 68.03 | 66.84 | 52.22 | 49.06 | 31.33 | 24.16 | 41.14 | |||||||||||||
1966 | 1.63 | a | 14.55 | 32.18 | 40.30 | 52.13 | 67.19 | a | 74.02 | 66.23 | 59.48 | 46.76 | 29.70 | 16.24 | 41.70 | |||||||||||
1967 | 13.84 | 7.71 | 27.50 | 43.03 | 51.08 | 65.60 | 67.95 | 65.11 | 59.23 | 45.55 | 29.40 | 18.97 | 41.25 | |||||||||||||
1968 | 11.24 | 11.59 | 35.53 | 46.98 | 52.90 | 64.32 | 69.05 | 68.65 | 59.80 | 50.16 | 32.80 | 16.37 | 43.28 | |||||||||||||
1969 | 9.45 | 18.27 | 23.95 | 47.15 | 58.48 | 59.48 | a | 70.08 | 72.18 | 60.77 | 44.35 | 31.12 | 19.08 | 42.86 | ||||||||||||
1970 | 5.10 | 13.48 | 23.31 | 43.80 | 55.56 | 68.77 | 72.56 | 69.31 | 58.58 | 48.19 | 30.38 | a | 17.26 | 42.19 | ||||||||||||
1971 | 5.35 | 15.52 | 25.27 | 43.93 | 53.89 | 70.40 | 67.50 | a | 66.44 | 60.98 | 52.97 | 32.37 | 16.60 | 42.60 | ||||||||||||
1972 | 4.82 | 8.93 | 23.40 | 39.92 | 60.74 | 65.12 | 68.23 | 67.81 | 57.17 | 42.50 | 30.71 | a | 11.29 | 40.05 | ||||||||||||
1973 | 14.15 | 18.55 | 37.90 | 43.48 | 53.58 | 67.50 | 70.87 | 71.53 | a | 58.22 | 52.60 | 33.03 | 16.13 | 44.80 | ||||||||||||
1974 | 10.68 | 14.91 | 27.45 | 44.23 | 53.42 | 63.47 | 74.06 | 66.58 | 54.98 | 48.37 | 34.12 | 23.20 | a | 42.96 | ||||||||||||
1975 | 13.61 | 15.71 | b | 21.52 | a | 38.13 | 60.58 | 66.84 | b | 72.85 | 69.03 | 56.05 | 50.55 | 35.87 | 16.55 | 43.11 | ||||||||||
1976 | 8.35 | 24.22 | 27.66 | 48.53 | 57.21 | 69.65 | 73.45 | 69.70 | a | 58.85 | 42.74 | 24.87 | 7.11 | 42.70 | ||||||||||||
1977 | -0.47 | a | 25.42 | j | 38.27 | i | 51.67 | a | 65.95 | 66.20 | 72.32 | 64.52 | 59.12 | 47.40 | 30.90 | 14.44 | 47.21 | b | ||||||||
1978 | 6.45 | a | 11.07 | a | 27.18 | 43.75 | b | 60.74 | b | 65.48 | 68.81 | 69.03 | a | 64.42 | 48.44 | 30.52 | b | 12.63 | 42.38 | |||||||
1979 | 1.94 | 7.69 | b | 26.74 | 40.15 | 52.43 | a | 64.48 | 70.50 | 67.27 | 61.41 | a | 45.34 | 30.67 | 22.44 | 40.92 | ||||||||||
1980 | 11.43 | a | 13.29 | 24.48 | 47.15 | 61.23 | c | 65.95 | 72.65 | 69.27 | a | 58.50 | 44.52 | 34.15 | 17.07 | a | 43.31 | |||||||||
1981 | 16.79 | b | 21.29 | 33.37 | 46.97 | a | 56.55 | 65.30 | 71.00 | 69.08 | 58.52 | 44.87 | a | 36.83 | 17.00 | a | 44.80 | |||||||||
1982 | 0.26 | 13.54 | b | 25.45 | a | 40.22 | c | 62.02 | c | 61.54 | b | 72.23 | a | 68.10 | b | 58.15 | d | 48.73 | 28.77 | b | 23.34 | c | 41.86 | |||
1983 | 16.64 | b | 24.95 | 31.74 | b | 40.86 | a | 52.34 | 66.24 | c | 74.07 | c | 73.55 | b | 60.08 | d | 47.32 | c | 33.80 | b | 5.25 | e | 43.90 | |||
1984 | 9.60 | f | 26.19 | c | 23.93 | a | 47.23 | d | 54.39 | c | 67.70 | 71.32 | 71.72 | a | 56.69 | d | 50.81 | d | 31.39 | b | 18.28 | d | 47.24 | a | ||
1985 | 11.44 | g | 28.33 | p | 34.59 | c | 49.72 | 62.13 | a | 62.11 | b | 70.57 | c | 65.31 | b | 58.13 | d | 46.60 | a | 25.06 | c | 4.81 | e | 47.90 | b | |
1986 | 15.00 | 15.56 | d | 33.09 | d | 48.41 | c | 59.62 | b | 66.85 | c | 72.00 | 65.24 | b | 57.67 | a | 47.13 | 27.02 | b | 19.78 | b | 43.95 | ||||
1987 | 18.28 | d | 27.58 | b | 35.61 | c | 51.53 | a | 60.93 | b | 69.60 | a | 72.84 | 67.18 | a | 60.77 | 41.34 | c | 33.93 | 21.74 | b | 46.78 | ||||
1988 | 6.76 | b | 10.23 | c | 28.89 | c | 43.58 | d | 62.69 | 71.48 | e | 75.62 | b | 70.19 | e | 59.47 | 41.52 | b | 30.56 | e | 14.72 | b | 42.98 | |||
1989 | 19.07 | b | 8.02 | a | 22.75 | a | ----- | z | 56.86 | c | 63.73 | d | ----- | z | 66.05 | a | 57.29 | a | 45.13 | a | 25.19 | a | 8.69 | 37.28 | b | |
1990 | 23.18 | 19.32 | 34.52 | 47.40 | a | 55.35 | 68.07 | 70.18 | a | 69.50 | ----- | z | 46.37 | 36.54 | b | 17.48 | b | 44.36 | a | |||||||
1991 | 9.45 | 21.41 | 30.72 | a | 47.76 | a | 60.40 | a | 70.20 | 70.22 | a | 70.47 | 58.40 | a | 45.39 | 23.90 | 18.82 | 43.93 | ||||||||
1992 | 18.29 | 25.36 | 31.15 | 40.50 | a | 58.88 | a | 63.65 | 65.03 | 64.82 | 58.24 | a | 44.64 | c | 29.62 | a | 18.05 | 43.19 | ||||||||
1993 | 11.55 | a | 14.98 | 26.60 | a | 40.68 | 55.47 | a | 62.07 | 68.69 | 69.33 | a | 53.11 | b | 43.73 | e | 28.44 | e | 18.06 | f | 43.15 | a | ||||
1994 | 1.10 | f | 10.50 | d | 31.34 | f | 42.76 | e | 57.85 | a | 67.07 | a | 68.31 | d | 66.28 | b | 63.04 | c | 49.09 | b | 35.52 | f | 23.90 | g | 53.11 | d |
1995 | 15.09 | d | 15.41 | e | 30.58 | a | 39.03 | a | 55.74 | b | 70.24 | a | 70.10 | a | 71.90 | 58.38 | d | 46.67 | d | 24.32 | h | 14.02 | d | 44.29 | a | |
1996 | 5.79 | e | 13.10 | i | 22.00 | e | 38.75 | d | 54.37 | a | 66.47 | a | 67.50 | 68.84 | 59.58 | 45.54 | c | 24.02 | a | 11.83 | b | 42.24 | a | |||
1997 | 8.36 | b | 16.81 | a | 26.87 | 40.59 | a | 50.95 | 68.19 | a | 68.74 | b | 65.66 | b | 60.03 | 48.24 | 27.52 | a | 24.97 | 42.24 | ||||||
1998 | 16.45 | 30.25 | 29.47 | 48.64 | b | 63.27 | a | 63.41 | a | 70.69 | 70.20 | a | 64.78 | a | 48.63 | a | 34.84 | b | 21.80 | a | 46.87 | |||||
1999 | 7.40 | b | 22.80 | a | 30.64 | c | 46.90 | 57.48 | c | 65.53 | 72.92 | a | 67.71 | 58.02 | b | 46.32 | c | 37.93 | c | 20.62 | c | 44.52 | ||||
2000 | 10.92 | a | 21.25 | a | 36.98 | b | 42.47 | ----- | z | 63.13 | d | 70.30 | a | 68.79 | b | 57.86 | e | 49.23 | c | 30.00 | a | 5.07 | a | 41.45 | a | |
2001 | 14.85 | a | 8.33 | a | 23.94 | e | 44.50 | e | 58.33 | b | 67.41 | a | 72.93 | c | 71.77 | a | 57.33 | a | 44.95 | b | 42.92 | d | 24.75 | a | 44.33 | |
2002 | 19.95 | a | 20.75 | b | 18.26 | b | 39.96 | b | 48.38 | a | 65.66 | b | 73.13 | 66.93 | c | 60.53 | a | 38.97 | a | 28.95 | a | 21.43 | b | 41.91 | ||
2003 | 9.85 | 10.06 | b | 25.26 | b | 41.66 | a | 54.42 | a | 64.64 | a | 69.15 | a | 71.12 | b | 58.90 | a | 47.03 | a | 30.34 | a | 20.62 | a | 41.92 | ||
2004 | 6.19 | 15.74 | b | 29.02 | c | ----- | z | 51.50 | a | 61.10 | 67.50 | 61.40 | a | 62.93 | a | 46.93 | b | 35.48 | c | 16.81 | b | 41.33 | a | |||
2005 | 10.83 | a | 20.59 | a | 24.29 | 47.03 | 50.92 | a | 69.57 | 71.23 | 68.18 | a | 63.00 | 48.41 | d | 33.42 | 16.71 | 43.68 | ||||||||
2006 | 24.73 | 14.05 | 28.44 | 48.83 | 56.52 | a | 66.72 | 74.66 | b | 68.81 | 55.98 | 42.24 | 33.55 | 24.89 | 44.95 | |||||||||||
2007 | 15.10 | a | 8.75 | 32.29 | 42.10 | a | 58.79 | 68.07 | 70.31 | 67.48 | 59.13 | 51.15 | a | 31.05 | a | 12.92 | 43.10 | |||||||||
2008 | 9.95 | 10.16 | a | 21.67 | a | 38.88 | 52.38 | b | 64.18 | 68.54 | c | 66.95 | 58.37 | 45.48 | 30.47 | 9.21 | 39.69 | |||||||||
2009 | 1.15 | a | 16.59 | 26.31 | 42.35 | 54.65 | 62.80 | 63.79 | 65.19 | 63.43 | 40.29 | 39.13 | 14.82 | 40.88 | ||||||||||||
2010 | 11.18 | 15.25 | 36.08 | 50.62 | 57.66 | 64.80 | 71.55 | 71.15 | 56.22 | 49.47 | 31.85 | 13.56 | 44.11 | |||||||||||||
2011 | 7.76 | 14.64 | 23.61 | 40.35 | 54.21 | 64.73 | 74.31 | 69.11 | 58.17 | a | 50.22 | a | 35.17 | 22.42 | 42.89 | |||||||||||
2012 | 17.81 | 23.55 | 41.16 | b | 45.43 | 59.55 | 67.15 | 75.11 | 67.82 | 58.55 | 43.18 | 32.80 | 20.82 | 46.08 | ||||||||||||
2013 | 12.44 | 13.07 | 20.68 | 34.38 | 53.55 | 64.72 | 69.60 | 69.37 | 61.55 | 45.95 | 27.92 | 7.52 | 40.06 | |||||||||||||
2014 | 2.68 | 3.46 | 17.97 | 36.60 | 54.85 | 66.58 | 67.45 | 68.52 | 58.30 | 45.42 | 21.97 | 21.69 | 38.79 | |||||||||||||
2015 | 12.23 | 4.95 | 30.65 | a | 45.35 | 56.44 | 65.60 | 69.82 | 66.15 | 65.03 | 48.50 | 38.37 | 27.97 | 44.25 | ||||||||||||
2016 | 12.55 | 18.28 | 35.55 | 43.13 | ----- | z | ----- | z | ----- | z | 67.31 | j | 60.98 | 48.29 | 40.08 | 16.74 | 34.45 | d | ||||||||
2017 | 15.44 | 24.05 | 27.02 | 43.98 | 52.79 | 64.33 | 68.02 | 63.55 | 61.22 | 47.76 | 27.12 | 13.18 | 42.37 | |||||||||||||
2018 | 9.39 | 8.00 | 25.48 | 29.32 | 61.78 | a | 66.93 | 69.32 | 67.89 | 60.28 | 40.58 | 23.20 | 21.47 | 40.30 | ||||||||||||
2019 | 9.82 | 7.23 | 21.08 | 40.05 | 50.47 | 63.83 | 70.60 | 65.31 | 60.15 | 42.08 | 25.33 | 17.55 | 39.46 | |||||||||||||
2020 | 16.29 | 14.17 | 30.55 | 39.07 | 53.74 | 66.55 | 71.10 | 68.31 | 56.12 | 38.19 | 34.77 | 20.53 | 42.45 | |||||||||||||
2021 | 16.24 | 5.86 | 34.03 | 42.27 | 53.90 | 69.68 | 70.15 | 68.50 | 60.25 | 52.45 | 31.93 | 19.15 | 43.70 | |||||||||||||
2022 | 3.98 | 8.14 | 25.58 | 35.68 | 55.92 | 65.33 | 69.10 | 66.74 | 59.85 | 46.37 | 31.25 | 13.48 | 40.12 | |||||||||||||
2023 | 17.19 | 14.14 | 22.29 | 39.45 | 58.27 | 68.88 | 68.05 | 67.68 | 62.67 | 48.32 | 32.32 | 30.11 | 44.11 | |||||||||||||
2024 | 17.55 | 27.66 | 31.40 | 43.52 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 30.03 | h | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 11.29 | 15.07 | 27.34 | 43.08 | 56.40 | 65.72 | 70.56 | 68.23 | 59.21 | 47.09 | 31.24 | 17.05 | 42.71 | |||||||||||||
S.D. | 5.68 | 6.08 | 5.19 | 4.21 | 3.64 | 2.74 | 2.39 | 2.40 | 2.49 | 3.64 | 4.26 | 5.27 | 1.69 | |||||||||||||
SKEW | 0.08 | 0.15 | 0.45 | -0.16 | 0.13 | -0.25 | 0.01 | 0.12 | 0.01 | 0.16 | -0.02 | -0.15 | -0.12 | |||||||||||||
MAX | 24.73 | 30.25 | 41.16 | 51.67 | 65.95 | 71.48 | 75.97 | 74.82 | 65.03 | 57.50 | 42.92 | 30.11 | 46.87 | |||||||||||||
MIN | -0.47 | -2.98 | 17.97 | 29.32 | 48.38 | 59.25 | 63.79 | 61.40 | 52.22 | 38.19 | 21.97 | 4.81 | 38.79 | |||||||||||||
YRS | 89 | 89 | 91 | 91 | 90 | 91 | 90 | 90 | 89 | 92 | 89 | 90 | 77 |