YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1923 | 0.69 | 0.74 | 0.16 | 0.17 | 3.40 | 3.93 | 1.21 | 1.21 | 0.82 | 0.04 | 0.24 | 0.01 | 12.62 | |||||||||||||
1924 | 0.18 | 0.09 | ----- | z | 0.34 | 0.12 | 0.80 | 0.27 | w | 0.11 | w | 1.22 | 0.96 | 0.35 | 0.42 | 4.48 | c | |||||||||
1925 | 0.16 | 0.43 | 0.44 | 1.16 | 0.92 | 2.49 | 1.95 | 2.13 | 4.43 | ----- | z | ----- | z | ----- | z | 14.11 | c | |||||||||
1926 | 0.34 | 0.15 | 1.13 | ----- | z | 1.48 | 3.95 | 5.96 | t | 0.46 | 2.78 | 1.01 | a | 0.28 | ----- | z | 11.58 | c | ||||||||
1927 | 1.14 | 0.11 | d | 0.88 | 0.50 | 0.00 | 1.06 | 1.20 | 1.61 | 0.53 | 0.48 | 0.11 | 0.83 | a | 8.45 | |||||||||||
1928 | 0.17 | 1.41 | 0.48 | 0.14 | a | 0.77 | 1.63 | 1.09 | y | 3.72 | 1.00 | 0.36 | 1.29 | 1.38 | 12.35 | a | ||||||||||
1929 | 2.43 | 0.04 | 0.02 | 0.95 | 3.21 | 1.16 | 4.11 | 1.55 | ----- | z | 1.05 | ----- | z | 1.05 | 15.57 | b | ||||||||||
1930 | 0.28 | 0.20 | 0.55 | 0.48 | 0.00 | 3.57 | 0.84 | 6.84 | 2.00 | 0.40 | ----- | z | ----- | z | 15.16 | b | ||||||||||
1931 | 0.00 | ----- | z | 0.20 | 0.00 | b | 0.72 | 2.08 | ----- | z | 4.79 | 1.96 | c | 0.80 | 0.22 | a | 0.06 | 10.83 | b | |||||||
1932 | 0.15 | 2.92 | ----- | z | 0.00 | ----- | z | 0.49 | 1.93 | 1.97 | 1.88 | ----- | z | ----- | z | 0.00 | 9.34 | d | ||||||||
1933 | 0.86 | 0.02 | 0.00 | 0.00 | 0.51 | ----- | z | 1.26 | 0.51 | x | 1.91 | 0.60 | 0.97 | ----- | z | 6.13 | c | |||||||||
1934 | ----- | z | 0.00 | 0.34 | ----- | z | 1.64 | ----- | z | 2.66 | v | 5.24 | j | 2.90 | ----- | z | 0.27 | 1.44 | x | 5.15 | g | |||||
1935 | 0.83 | 0.56 | v | ----- | z | 0.26 | a | ----- | z | 1.23 | y | 1.67 | v | 1.14 | o | 0.46 | n | 0.37 | x | 3.80 | v | 0.14 | b | 1.23 | i | |
1936 | 0.04 | 0.93 | v | 0.36 | 0.00 | a | 0.48 | 1.79 | 3.51 | n | 3.75 | 1.14 | r | 2.60 | 0.70 | s | 0.59 | v | 9.02 | e | ||||||
1937 | 3.21 | n | 0.67 | 0.12 | a | 1.06 | 0.00 | a | 1.77 | x | ----- | z | 2.93 | r | 1.05 | ----- | z | ----- | z | 0.32 | w | 2.90 | g | |||
1938 | 0.38 | y | 0.90 | y | 0.62 | ----- | z | 0.27 | 3.45 | r | 2.57 | 4.73 | n | 0.63 | 0.14 | 0.33 | s | 0.36 | v | 4.23 | g | |||||
1939 | 0.29 | w | 0.13 | 0.53 | w | 0.11 | 1.50 | 3.37 | i | 3.20 | 1.22 | l | 1.70 | k | 0.78 | 1.03 | 0.10 | 6.85 | e | |||||||
1940 | 3.09 | 0.06 | 0.10 | y | 0.00 | 1.68 | 1.75 | n | 1.27 | 0.62 | 1.66 | l | 0.36 | b | 2.06 | v | 0.50 | w | 7.08 | e | ||||||
1941 | 0.44 | 0.27 | ----- | z | 0.25 | a | 0.96 | w | 2.28 | 3.48 | 3.34 | 1.81 | 0.79 | 0.62 | 0.22 | 13.50 | b | |||||||||
1942 | 0.15 | 0.05 | 0.10 | 0.10 | 0.22 | 1.30 | 2.17 | 3.05 | 1.97 | 1.18 | a | ----- | z | 0.22 | a | 10.51 | a | |||||||||
1943 | 0.00 | u | 0.07 | ----- | z | ----- | z | ----- | z | 0.31 | 3.06 | 2.65 | l | 1.22 | ----- | z | 0.31 | 1.52 | b | 6.49 | f | |||||
1944 | 1.25 | 1.00 | b | 1.04 | a | ----- | z | 0.33 | 1.80 | 1.31 | 6.27 | 3.57 | 1.07 | 0.33 | c | 1.00 | 18.97 | a | ||||||||
1945 | 0.06 | 0.93 | 0.41 | 0.34 | 0.53 | 5.83 | 4.88 | 2.56 | 0.95 | 1.67 | k | 1.07 | 0.18 | 17.74 | a | |||||||||||
1946 | 0.25 | a | 0.43 | 0.79 | 0.30 | 0.52 | 1.14 | 1.30 | 1.84 | 0.78 | 0.90 | 0.43 | a | 1.46 | 10.14 | |||||||||||
1947 | 1.25 | 0.08 | 0.32 | t | 0.20 | 0.32 | 0.85 | 1.21 | 2.55 | 1.58 | 0.66 | 0.84 | 0.17 | 9.71 | a | |||||||||||
1948 | 0.81 | 0.36 | 0.14 | 7.15 | 0.03 | 1.05 | 2.51 | 2.98 | 0.44 | 1.13 | a | 0.74 | 0.50 | 17.84 | ||||||||||||
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.35 | l | 0.96 | a | 0.09 | 0.40 | 1.45 | i | ||
1950 | ----- | z | ----- | z | 0.41 | 0.13 | 0.72 | 0.36 | 3.44 | a | 1.52 | 0.88 | 0.38 | 2.44 | 0.37 | 10.65 | b | |||||||||
1951 | 0.42 | 0.70 | 0.24 | 0.03 | 0.31 | 1.27 | 1.74 | 2.32 | 0.19 | f | 0.86 | 0.56 | 1.01 | 9.46 | a | |||||||||||
1952 | 0.48 | 0.13 | 0.25 | 0.06 | 0.50 | h | 3.31 | 4.01 | 1.90 | 1.96 | 0.93 | 0.32 | 0.11 | 13.46 | a | |||||||||||
1953 | 0.35 | 0.66 | 0.11 | 0.06 | 0.67 | 3.15 | 4.01 | 4.99 | 1.59 | 0.45 | 0.03 | 0.38 | 16.45 | |||||||||||||
1954 | 1.32 | 0.22 | 0.31 | 0.20 | 0.15 | 3.65 | 3.28 | 1.21 | 3.91 | 0.34 | 0.18 | 1.00 | 15.77 | |||||||||||||
1955 | 0.58 | 1.31 | 0.57 | 0.18 | b | 2.05 | 1.10 | 0.76 | 3.36 | 0.60 | 1.30 | 0.40 | 3.01 | 15.22 | ||||||||||||
1956 | 0.41 | a | 1.64 | 0.10 | 0.34 | 0.06 | 2.96 | 2.47 | 5.29 | 0.97 | a | 0.54 | 1.47 | 0.65 | 16.90 | |||||||||||
1957 | 1.22 | 1.41 | 0.07 | 0.25 | 0.13 | 2.55 | 2.12 | 0.47 | a | 1.82 | a | 2.02 | 0.55 | 0.42 | 13.03 | |||||||||||
1958 | 1.16 | 0.33 | 0.26 | 0.33 | 1.77 | 0.90 | 1.21 | 2.06 | 1.37 | 0.69 | 0.61 | 0.89 | 11.58 | |||||||||||||
1959 | 0.09 | 1.19 | 0.80 | 0.33 | 0.63 | 0.98 | 6.71 | 2.92 | 1.01 | 0.78 | 0.48 | 0.61 | 16.53 | |||||||||||||
1960 | 0.58 | 0.28 | 0.25 | 0.46 | 0.29 | 1.08 | 2.57 | 1.64 | 0.99 | 0.39 | 0.39 | 0.26 | 9.18 | |||||||||||||
1961 | 0.19 | 0.10 | 0.36 | 0.78 | 0.50 | 2.89 | 2.94 | 2.11 | 2.51 | 0.89 | 0.47 | 0.64 | 14.38 | |||||||||||||
1962 | 1.15 | 0.59 | 1.06 | a | 0.47 | 0.55 | 4.71 | 3.89 | 2.70 | 1.72 | 0.65 | 0.10 | 0.59 | 18.18 | ||||||||||||
1963 | 0.63 | 0.37 | 2.40 | 0.34 | 0.43 | 4.63 | 2.91 | 2.33 | 0.34 | 1.62 | 0.11 | 0.46 | 16.57 | |||||||||||||
1964 | ----- | z | ----- | z | 0.45 | 0.92 | 0.80 | 1.47 | 3.67 | 1.43 | 1.34 | 1.01 | 1.46 | 0.87 | 13.42 | b | ||||||||||
1965 | 0.20 | 0.28 | 0.76 | 0.41 | 0.23 | 3.21 | 2.35 | 0.95 | 2.86 | 1.32 | 0.63 | 2.65 | 15.85 | |||||||||||||
1966 | 0.09 | 2.21 | 0.42 | 0.00 | 0.76 | 2.36 | 1.76 | 1.55 | 0.67 | 0.45 | b | 2.68 | 0.89 | 13.84 | ||||||||||||
1967 | 0.62 | a | 0.36 | a | 3.12 | 1.84 | 2.17 | 4.08 | 7.39 | 3.45 | 0.79 | 0.39 | 1.94 | 1.44 | 27.59 | |||||||||||
1968 | 1.69 | a | 0.57 | 0.00 | 0.76 | 2.85 | 2.18 | 3.71 | 1.67 | 0.57 | 0.70 | a | 0.38 | b | 1.11 | 16.19 | ||||||||||
1969 | 1.65 | 0.06 | 0.12 | a | 0.09 | 1.32 | 0.08 | 2.86 | a | 3.63 | 0.09 | 0.82 | 0.35 | 0.09 | 11.16 | |||||||||||
1970 | 0.17 | a | 0.41 | 0.12 | 0.71 | 2.52 | 5.10 | 3.34 | 1.29 | 3.21 | 1.83 | a | 5.19 | a | 2.26 | 26.15 | ||||||||||
1971 | 0.60 | 0.77 | 0.58 | 0.18 | 0.58 | 2.16 | 1.17 | 4.17 | 1.40 | 1.68 | 0.64 | 1.07 | 15.00 | |||||||||||||
1972 | 0.32 | 0.40 | 0.34 | 0.09 | 0.11 | 2.03 | 1.98 | 0.93 | 3.32 | 0.51 | 0.29 | 1.22 | 11.54 | |||||||||||||
1973 | 0.70 | 0.00 | 0.28 | 0.00 | 0.62 | 1.43 | 4.53 | 2.24 | 0.52 | 0.57 | 0.92 | 0.16 | 11.97 | |||||||||||||
1974 | 0.05 | 0.25 | 0.15 | 0.14 | 0.26 | 3.03 | 4.81 | 2.88 | 0.63 | 1.39 | 0.83 | 0.94 | 15.36 | |||||||||||||
1975 | 1.87 | 0.26 | 0.24 | 0.22 | a | 0.16 | 0.22 | o | 4.98 | 4.40 | ----- | z | 0.33 | c | 1.11 | a | 0.00 | g | 13.57 | c | ||||||
1976 | 0.00 | h | 0.03 | a | 0.37 | 0.04 | 1.60 | a | 0.45 | 3.75 | 1.19 | 0.87 | 1.37 | 1.43 | 0.16 | 11.26 | a | |||||||||
1977 | 1.30 | 0.45 | 0.40 | g | 0.36 | e | 1.01 | 3.25 | 1.52 | 1.53 | 3.21 | 1.16 | 0.22 | 0.53 | a | 14.54 | a | |||||||||
1978 | 0.25 | 1.10 | 0.32 | 0.11 | 0.78 | 1.42 | 2.08 | 3.39 | 0.88 | 0.53 | 0.53 | 0.61 | a | 12.00 | ||||||||||||
1979 | 1.01 | 0.42 | 0.74 | 0.21 | 0.50 | 2.47 | 3.17 | 1.17 | 0.78 | 0.71 | 1.29 | 0.34 | 12.81 | |||||||||||||
1980 | 1.82 | 0.36 | 0.05 | 1.13 | 0.32 | 3.80 | 2.31 | 2.12 | 1.78 | 0.73 | 0.29 | 0.18 | 14.89 | |||||||||||||
1981 | 0.30 | 0.48 | 0.10 | 0.87 | 0.42 | 3.75 | 4.18 | 3.83 | 0.93 | 0.57 | a | 0.28 | 0.59 | 16.30 | ||||||||||||
1982 | 0.51 | a | 0.78 | 0.32 | n | 0.28 | a | 0.31 | 3.15 | 2.81 | 0.56 | 1.85 | 1.14 | 0.94 | 0.49 | 12.82 | a | |||||||||
1983 | 0.80 | 0.12 | 0.38 | 0.01 | 0.33 | a | 1.38 | 2.56 | 4.01 | 1.44 | 0.77 | 0.12 | 0.48 | 12.40 | ||||||||||||
1984 | 0.95 | 0.69 | 0.00 | 0.32 | a | 0.94 | 1.83 | 4.29 | 3.11 | n | 0.50 | 0.58 | a | 0.58 | 3.45 | 14.13 | a | |||||||||
1985 | 0.28 | 0.46 | 0.99 | 0.19 | 0.78 | 2.63 | 2.24 | 1.58 | 3.02 | e | 0.50 | 0.95 | 0.29 | 13.91 | ||||||||||||
1986 | 0.33 | 0.11 | 0.21 | a | 0.08 | 0.48 | a | 1.12 | 7.67 | 4.37 | 1.75 | 2.01 | p | 0.32 | 0.28 | 16.72 | a | |||||||||
1987 | 0.63 | t | 0.01 | 0.01 | 0.32 | v | ----- | z | 1.08 | 4.34 | g | 1.40 | 1.12 | 0.16 | 0.89 | 0.54 | 5.21 | d | ||||||||
1988 | 0.10 | 0.42 | 0.63 | q | 0.14 | 1.85 | q | 3.26 | g | 3.91 | p | 1.80 | 1.53 | m | 2.71 | j | 0.50 | q | 0.35 | n | 2.46 | h | ||||
1989 | 0.48 | 1.11 | 0.40 | 0.05 | 0.54 | k | 3.41 | j | 1.21 | m | 2.31 | k | 1.52 | 2.59 | 0.51 | 1.10 | 7.76 | d | ||||||||
1990 | 0.84 | 1.35 | 0.59 | 0.00 | 0.31 | 3.56 | k | 4.42 | 4.77 | 4.37 | 0.56 | 2.11 | 2.58 | 21.90 | a | |||||||||||
1991 | 1.59 | a | 0.50 | 1.91 | 0.00 | 0.45 | 1.30 | 3.79 | 1.62 | 0.58 | 1.25 | a | 0.47 | 0.75 | 14.21 | |||||||||||
1992 | 1.02 | 1.10 | 0.17 | 0.55 | 1.36 | 1.99 | 2.64 | 1.02 | 4.72 | 1.29 | h | 1.80 | 2.35 | 18.72 | a | |||||||||||
1993 | 1.36 | 0.16 | 0.10 | 0.00 | 0.08 | g | 1.31 | 2.67 | 2.80 | 3.71 | 1.14 | 2.06 | 0.51 | 15.82 | a | |||||||||||
1994 | 0.17 | 0.28 | 0.97 | 0.41 | 0.21 | 5.67 | 0.76 | 1.66 | 0.39 | 0.59 | 1.41 | 1.28 | 13.80 | |||||||||||||
1995 | 0.08 | 0.34 | 0.35 | 0.13 | 1.40 | 3.35 | 2.32 | 2.32 | 1.33 | 0.27 | d | 0.23 | 0.17 | 12.29 | ||||||||||||
1996 | 0.19 | 2.71 | 0.19 | 0.05 | 0.70 | s | 1.31 | 1.61 | 3.38 | 1.23 | 1.81 | 0.71 | 0.80 | 13.99 | a | |||||||||||
1997 | 0.07 | a | 0.17 | 0.07 | 0.11 | 1.52 | 2.15 | 3.03 | 3.68 | 1.53 | 1.42 | 0.47 | 0.66 | 14.88 | ||||||||||||
1998 | 0.12 | 0.17 | 0.00 | 0.83 | 0.59 | 1.67 | 4.53 | 3.45 | 1.49 | 0.27 | 0.30 | 0.95 | 14.37 | |||||||||||||
1999 | 0.53 | 0.20 | 0.23 | 0.08 | 1.67 | 1.45 | 3.51 | 1.50 | 2.86 | 0.65 | 0.44 | 3.12 | 16.24 | |||||||||||||
2000 | 1.69 | 0.79 | 0.20 | 0.70 | 0.24 | a | 1.07 | 3.02 | 5.76 | 2.35 | 0.57 | 0.39 | 0.10 | 16.88 | ||||||||||||
2001 | 0.24 | 0.44 | 0.37 | 0.21 | 1.09 | 1.03 | 4.03 | 2.21 | 0.60 | 0.97 | 0.12 | 0.19 | 11.50 | |||||||||||||
2002 | 0.38 | 0.21 | 0.17 | 2.75 | 0.80 | 3.86 | 4.59 | 5.38 | 0.81 | 1.13 | 0.18 | 0.26 | 20.52 | |||||||||||||
2003 | 0.30 | 0.25 | 0.21 | b | 0.00 | 0.44 | 1.24 | 4.78 | 2.79 | 1.73 | 0.52 | 1.63 | 0.98 | a | 14.87 | |||||||||||
2004 | 0.31 | 0.51 | 0.53 | 0.22 | 2.20 | 1.24 | 2.85 | 1.20 | 1.09 | 0.35 | 0.99 | 1.55 | 13.04 | |||||||||||||
2005 | 1.49 | 0.35 | 0.41 | 0.92 | 1.51 | o | 3.15 | k | 3.33 | 1.20 | 2.57 | 0.20 | 1.14 | 0.54 | 12.15 | b | ||||||||||
2006 | 0.60 | 0.87 | a | 0.18 | b | 0.48 | 0.28 | 2.76 | 3.64 | 3.01 | 1.44 | 1.73 | 0.12 | 0.92 | 16.03 | |||||||||||
2007 | 0.48 | 0.36 | 0.24 | 0.31 | 1.12 | 1.49 | 1.57 | 4.17 | 2.03 | 0.37 | 0.34 | 0.32 | 12.80 | |||||||||||||
2008 | 0.55 | 0.52 | 0.25 | 1.29 | 0.25 | 1.43 | b | 4.92 | 3.32 | 1.06 | 0.95 | 1.02 | 0.58 | 16.14 | ||||||||||||
2009 | 1.18 | 0.35 | 0.43 | 0.09 | 0.76 | 1.34 | 1.27 | 3.74 | 0.92 | 0.18 | 0.55 | 0.67 | 11.48 | |||||||||||||
2010 | 0.33 | 0.20 | 0.38 | 0.16 | 0.14 | 3.23 | 2.38 | 1.94 | 0.50 | 0.18 | 0.67 | 0.64 | 10.75 | |||||||||||||
2011 | 0.35 | 2.45 | 0.02 | 0.05 | a | 0.73 | 1.95 | 2.49 | 1.85 | 0.27 | 0.37 | 0.65 | 1.68 | 12.86 | ||||||||||||
2012 | 1.01 | 0.73 | 0.29 | 0.11 | 0.60 | 4.76 | 0.78 | 1.78 | 2.40 | 1.05 | 0.50 | 0.40 | 14.41 | |||||||||||||
2013 | 0.60 | 0.35 | 0.97 | 0.82 | 0.33 | 0.79 | 1.91 | 2.57 | 2.15 | 1.79 | 2.03 | 0.42 | 14.73 | |||||||||||||
2014 | 0.90 | 0.41 | 0.27 | 0.01 | 0.48 | 3.66 | 4.61 | 2.31 | 2.25 | 0.45 | 0.05 | 0.29 | 15.69 | |||||||||||||
2015 | 0.75 | 0.08 | 0.25 | 0.52 | 0.42 | 2.46 | 6.18 | 5.16 | 3.91 | 0.76 | 2.06 | 0.24 | 22.79 | |||||||||||||
2016 | 0.13 | 0.13 | 0.77 | 0.01 | 1.51 | 2.55 | 5.82 | 1.76 | 2.25 | 0.43 | 0.30 | 1.48 | 17.14 | |||||||||||||
2017 | 0.68 | 1.48 | 0.20 | 0.07 | 1.19 | 1.88 | 2.87 | 1.61 | 1.59 | 1.76 | 1.71 | 0.58 | 15.62 | |||||||||||||
2018 | 0.41 | 1.24 | 1.14 | 0.87 | 0.66 | 2.56 | 1.78 | 5.01 | 1.25 | 0.81 | 0.48 | 0.98 | 17.19 | |||||||||||||
2019 | 0.42 | 0.24 | 0.04 | 0.29 | 0.79 | 4.07 | 3.01 | 9.53 | 1.21 | 1.93 | 1.75 | 0.65 | 23.93 | |||||||||||||
2020 | 0.48 | 0.77 | 2.72 | 0.52 | 0.72 | 4.69 | 2.81 | 2.51 | 1.91 | 0.93 | 0.49 | 0.48 | 19.03 | |||||||||||||
2021 | 0.13 | 1.13 | 0.20 | 0.81 | 0.97 | 1.22 | 3.29 | 4.34 | 0.74 | 1.37 | 0.67 | 8.65 | 23.52 | |||||||||||||
2022 | 0.69 | 1.72 | 0.70 | 0.01 | 0.73 | 1.36 | 1.48 | 2.61 | 2.37 | 1.54 | 0.99 | 0.77 | 14.97 | |||||||||||||
2023 | 1.20 | 0.77 | 0.30 | 0.46 | 2.03 | 0.50 | 1.54 | 1.79 | 2.04 | 1.04 | 0.71 | 1.54 | 13.92 | |||||||||||||
2024 | 0.66 | 0.27 | 0.50 | 0.15 | i | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 1.43 | i | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 0.66 | 0.58 | 0.46 | 0.43 | 0.82 | 2.23 | 2.98 | 2.73 | 1.65 | 0.87 | 0.80 | 0.89 | 15.26 | |||||||||||||
S.D. | 0.57 | 0.59 | 0.54 | 0.82 | 0.72 | 1.32 | 1.47 | 1.57 | 1.03 | 0.53 | 0.76 | 1.09 | 3.77 | |||||||||||||
SKEW | 1.51 | 1.90 | 2.91 | 6.18 | 1.53 | 0.73 | 0.86 | 1.35 | 1.00 | 1.03 | 2.66 | 4.43 | 1.22 | |||||||||||||
MAX | 3.09 | 2.92 | 3.12 | 7.15 | 3.40 | 5.83 | 7.67 | 9.53 | 4.72 | 2.60 | 5.19 | 8.65 | 27.59 | |||||||||||||
MIN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.08 | 0.76 | 0.46 | 0.09 | 0.04 | 0.03 | 0.00 | 8.45 | |||||||||||||
YRS | 92 | 95 | 90 | 94 | 89 | 88 | 89 | 90 | 92 | 91 | 90 | 90 | 60 |