YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1923 | 1.90 | 0.17 | 0.80 | ----- | z | 1.50 | 2.65 | u | 1.04 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 5.41 | g | |||||
1924 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
1925 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
1926 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
1928 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
1929 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
1930 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.63 | 0.63 | k | |
1932 | 0.31 | a | ----- | z | 0.23 | ----- | z | ----- | z | 1.90 | 2.47 | 1.24 | 0.32 | 1.68 | 1.26 | a | 0.59 | 10.00 | c | |||||||
1933 | 0.50 | 0.15 | 0.35 | 1.28 | 2.19 | 1.36 | 0.17 | 0.83 | 0.86 | 1.51 | 0.31 | 1.09 | 10.60 | |||||||||||||
1934 | 0.47 | 0.64 | 0.98 | 0.12 | 0.08 | 2.32 | 1.10 | 0.19 | 0.92 | 2.30 | 0.11 | 1.21 | 10.44 | |||||||||||||
1935 | 0.45 | a | 0.06 | 0.82 | 1.87 | 1.31 | 0.73 | 0.36 | 0.79 | 0.05 | 0.63 | 0.41 | 0.44 | 7.92 | ||||||||||||
1936 | 0.75 | b | 1.08 | 0.52 | 1.45 | 1.16 | 2.42 | 1.59 | 0.83 | 1.23 | 0.10 | 0.37 | 0.47 | 11.97 | ||||||||||||
1937 | 0.45 | 0.72 | 1.35 | 1.42 | 0.47 | 1.44 | 3.26 | 0.48 | 0.81 | 0.05 | 0.44 | 0.95 | a | 11.84 | ||||||||||||
1938 | 0.78 | 0.57 | 1.10 | a | 0.47 | 2.39 | a | 3.16 | 2.85 | 0.61 | 0.33 | 1.40 | 0.61 | 0.30 | 14.57 | |||||||||||
1939 | 0.77 | 0.82 | 2.11 | 0.82 | 2.31 | 1.73 | 0.54 | 0.78 | a | 0.68 | 0.60 | 0.00 | 0.52 | 11.68 | ||||||||||||
1940 | 1.41 | r | 1.27 | 1.30 | 1.38 | 0.89 | 0.49 | 0.98 | 0.20 | 3.28 | t | 0.85 | 1.18 | 0.47 | 9.01 | b | ||||||||||
1941 | 0.29 | 0.43 | 0.46 | 0.92 | x | 1.88 | 2.38 | 0.59 | 2.85 | 1.91 | 1.20 | 1.32 | 1.34 | 14.65 | a | |||||||||||
1942 | 0.87 | 0.36 | 0.31 | 1.40 | 3.44 | b | 1.42 | 0.25 | 0.30 | 0.13 | 0.79 | 1.96 | t | 1.55 | 10.82 | a | ||||||||||
1943 | 1.86 | 0.23 | 0.42 | 1.23 | 0.57 | 1.35 | t | 0.63 | 1.30 | 0.25 | 0.95 | 0.33 | 0.37 | 8.14 | a | |||||||||||
1944 | 0.44 | 0.65 | 0.66 | 0.79 | s | 3.71 | q | 4.13 | 1.13 | 1.00 | 1.00 | ----- | z | 0.90 | 0.61 | y | 9.91 | d | ||||||||
1945 | 0.55 | a | 0.78 | 1.18 | 0.75 | 1.98 | 1.95 | 0.27 | 0.45 | 1.00 | 0.55 | 0.98 | 0.53 | s | 10.44 | a | ||||||||||
1946 | 0.65 | x | 0.59 | t | 0.68 | t | 0.39 | x | 2.45 | s | 1.33 | t | 1.58 | 2.17 | 2.74 | 1.03 | t | 1.01 | 0.95 | 8.45 | g | |||||
1947 | 0.56 | 0.56 | 0.64 | ----- | z | ----- | z | ----- | z | ----- | z | 0.46 | s | 2.11 | 1.45 | 1.01 | 0.48 | 6.81 | e | |||||||
1948 | 1.05 | 1.22 | 1.37 | 0.65 | f | 2.71 | 2.18 | 1.54 | 0.64 | a | 0.82 | 0.60 | 1.26 | ----- | z | 13.39 | b | |||||||||
1949 | ----- | z | ----- | z | ----- | z | 0.45 | ----- | z | 1.06 | e | 0.06 | a | ----- | z | 0.54 | g | 0.68 | 0.52 | 0.48 | 3.25 | f | ||||
1950 | 0.95 | 0.47 | 0.69 | 0.75 | a | 0.74 | 3.89 | 1.06 | 1.20 | 1.28 | 1.06 | 1.15 | 0.48 | 13.72 | ||||||||||||
1951 | 0.71 | 0.93 | 0.49 | a | 0.30 | a | 3.27 | 1.10 | 0.65 | 1.92 | 0.53 | 1.74 | 0.57 | 1.50 | 13.71 | |||||||||||
1952 | 0.19 | 1.06 | 0.99 | 0.60 | 3.12 | 1.68 | a | 0.99 | 1.43 | 0.13 | 0.13 | 0.35 | 0.43 | 11.10 | ||||||||||||
1953 | 1.45 | 1.19 | 0.54 | 1.63 | 1.95 | 2.60 | 0.00 | 0.28 | 0.23 | 0.43 | 1.08 | 0.82 | 12.20 | |||||||||||||
1954 | 0.85 | a | 0.46 | 0.94 | 1.07 | 0.58 | 3.53 | 0.31 | 1.67 | 0.40 | 0.59 | 0.20 | 1.03 | 11.63 | ||||||||||||
1955 | 0.29 | 0.51 | 1.54 | 1.30 | 1.27 | 2.32 | 1.78 | a | 0.02 | 0.33 | 0.81 | 2.03 | 2.18 | 14.38 | ||||||||||||
1956 | 1.00 | 0.07 | 0.92 | 0.73 | 1.14 | 1.31 | 0.90 | 0.81 | a | 0.21 | 1.08 | 0.12 | 0.64 | 8.93 | ||||||||||||
1957 | 0.85 | 0.41 | 1.06 | 0.40 | 2.49 | 1.36 | 0.42 | 0.30 | 0.10 | 1.84 | 0.27 | 1.06 | 10.56 | |||||||||||||
1958 | 0.45 | 0.38 | 0.97 | 0.94 | 1.26 | 4.21 | 1.60 | 0.78 | 0.47 | 0.25 | 0.89 | 0.77 | 12.97 | |||||||||||||
1959 | 0.37 | 1.23 | 0.40 | 0.58 | 1.33 | 2.17 | 1.14 | 1.20 | 2.51 | 1.40 | 0.39 | 0.30 | 13.02 | |||||||||||||
1960 | 0.55 | 0.77 | 0.98 | 0.92 | 1.96 | 0.27 | 0.13 | 2.47 | 0.88 | 0.30 | 0.76 | 0.27 | 10.26 | |||||||||||||
1961 | 0.05 | 0.23 | 0.28 | 0.47 | 1.56 | 1.11 | 1.62 | 0.61 | 1.59 | 0.69 | 0.57 | 0.60 | 9.38 | |||||||||||||
1962 | 0.80 | 0.81 | 0.59 | 0.30 | 2.57 | 1.44 | 0.90 | 1.05 | 0.44 | 0.68 | 1.89 | 0.30 | 11.77 | |||||||||||||
1963 | 0.61 | 0.75 | 0.60 | 0.99 | 0.73 | 2.68 | 0.36 | 0.29 | 1.54 | 1.89 | 0.82 | 0.26 | 11.52 | |||||||||||||
1964 | 1.24 | 0.26 | 0.45 | 0.97 | 1.13 | 3.85 | 1.13 | 1.51 | 0.47 | 0.15 | 1.22 | 2.56 | 14.94 | |||||||||||||
1965 | 1.11 | 0.22 | 0.21 | 1.35 | 1.57 | 2.11 | 0.76 | 1.68 | 1.25 | 0.18 | 0.39 | 0.33 | 11.16 | |||||||||||||
1966 | 0.45 | 0.49 | 0.50 | 0.28 | 0.88 | 1.92 | 0.22 | 0.60 | 1.39 | 0.20 | 0.45 | 0.55 | 7.93 | |||||||||||||
1967 | 1.03 | 0.30 | 1.05 | 1.89 | 1.46 | 3.16 | 0.98 | 0.12 | 1.29 | 2.67 | 0.55 | 1.24 | 15.74 | |||||||||||||
1968 | 0.56 | 0.48 | 0.34 | 0.69 | 1.21 | 0.82 | 0.15 | 2.48 | 1.68 | 0.46 | 0.98 | 0.83 | 10.68 | |||||||||||||
1969 | 1.63 | 0.24 | 0.13 | 0.44 | 1.73 | 2.38 | 1.32 | 0.27 | 1.16 | 0.86 | 0.37 | 0.55 | 11.08 | |||||||||||||
1970 | 0.47 | 0.10 | 0.74 | 0.18 | 1.86 | 1.43 | 1.51 | 0.47 | 2.64 | 0.42 | 0.55 | 0.37 | 10.74 | |||||||||||||
1971 | 0.90 | 0.33 | 0.39 | 1.26 | 0.67 | 1.63 | 0.34 | 1.08 | 0.82 | 0.55 | 1.02 | 1.07 | 10.06 | |||||||||||||
1972 | 0.82 | 0.70 | 1.04 | 0.61 | 0.77 | 1.09 | 0.35 | 1.55 | 0.82 | 0.24 | 0.43 | 0.37 | 8.79 | |||||||||||||
1973 | 0.44 | 0.05 | 0.42 | 0.31 | 0.42 | 1.12 | 0.45 | 0.43 | 0.96 | 0.50 | 1.32 | 1.09 | 7.51 | |||||||||||||
1974 | 0.39 | 0.26 | 0.90 | 0.27 | 0.60 | 0.20 | 0.60 | 0.88 | 0.13 | 0.40 | 0.44 | 0.53 | 5.60 | |||||||||||||
1975 | 0.93 | 0.35 | 0.75 | 2.01 | 0.64 | 1.36 | 2.47 | 2.08 | 0.21 | 1.47 | 0.92 | 0.96 | 14.15 | |||||||||||||
1976 | 0.44 | 0.78 | 0.69 | 1.39 | 1.09 | 2.81 | 0.86 | 1.84 | 2.53 | 0.08 | 0.19 | 0.65 | 13.35 | |||||||||||||
1977 | 0.82 | 0.02 | 0.74 | 0.13 | 2.17 | 2.46 | 1.93 | 1.02 | 2.34 | 0.64 | 0.90 | 1.47 | 14.64 | |||||||||||||
1978 | 0.76 | 0.53 | 0.23 | 1.42 | 2.66 | 0.86 | 2.11 | 0.74 | 1.80 | 0.10 | 0.47 | 0.85 | 12.53 | |||||||||||||
1979 | 0.70 | 0.84 | 0.73 | 1.17 | 0.42 | 0.70 | 1.02 | 0.98 | 0.03 | 0.76 | 0.29 | 0.25 | 7.89 | |||||||||||||
1980 | 0.74 | 0.63 | 0.50 | 0.67 | 3.59 | 2.60 | 1.43 | 0.96 | 1.81 | 0.84 | 0.66 | 0.87 | 15.30 | |||||||||||||
1981 | 0.04 | 0.68 | 0.48 | 1.58 | 4.32 | 2.16 | 0.86 | 0.35 | 0.82 | 0.72 | 1.66 | 0.79 | 14.46 | |||||||||||||
1982 | 0.39 | t | 0.58 | 0.64 | 0.67 | 1.35 | 1.19 | 0.71 | 0.58 | 1.52 | 0.95 | a | 0.35 | 0.85 | 9.39 | a | ||||||||||
1983 | 0.35 | 0.59 | 1.12 | 0.46 | 0.75 | 2.25 | 3.02 | 1.94 | 1.64 | 1.02 | 1.20 | 0.62 | 14.96 | |||||||||||||
1984 | 0.16 | 0.36 | 0.81 | 0.99 | 2.03 | 2.53 | 1.11 | 1.14 | 0.65 | 0.90 | 1.14 | 0.64 | 12.46 | |||||||||||||
1985 | 0.46 | 0.42 | 0.73 | 0.36 | 2.14 | 1.02 | 0.81 | 2.33 | 2.44 | 0.27 | 0.58 | 0.21 | 11.77 | |||||||||||||
1986 | 0.48 | 1.24 | 0.64 | 1.00 | 0.94 | 2.04 | 1.19 | 2.02 | 2.51 | 0.26 | 0.83 | 0.22 | 13.37 | |||||||||||||
1987 | 0.29 | 0.21 | 0.44 | 0.49 | 1.88 | 1.05 | 1.41 | 1.14 | 0.01 | 0.00 | 0.30 | 0.81 | 8.03 | |||||||||||||
1988 | 0.52 | 0.45 | 0.66 | 1.90 | 2.18 | 1.32 | 0.12 | 0.40 | 0.42 | 0.25 | 1.09 | 0.15 | 9.46 | |||||||||||||
1989 | 0.88 | 0.65 | 1.23 | 0.41 | 2.01 | 1.21 | 1.23 | 1.97 | 0.46 | 1.20 | a | 0.36 | 0.30 | 11.91 | ||||||||||||
1990 | 0.58 | 0.05 | 0.54 | 1.00 | 1.82 | 0.93 | 1.01 | 2.03 | 0.36 | 0.74 | 0.46 | 0.35 | 9.87 | |||||||||||||
1991 | 0.11 | 0.19 | 0.82 | 1.08 | 2.61 | 2.93 | 1.47 | 0.96 | 0.80 | 0.61 | 1.35 | 0.51 | 13.44 | |||||||||||||
1992 | 0.15 | 0.18 | 0.24 | 1.11 | 0.50 | a | 2.68 | 2.19 | 0.47 | 0.77 | 1.93 | 0.71 | e | 1.26 | a | 12.19 | ||||||||||
1993 | 0.70 | 0.77 | 0.77 | a | 1.49 | a | 1.34 | 3.88 | 2.38 | 1.77 | 0.19 | 1.00 | 0.29 | 0.24 | 14.82 | |||||||||||
1994 | 0.23 | 0.46 | 0.30 | 0.66 | 2.32 | 1.91 | 1.51 | 0.42 | a | 0.10 | 1.03 | 0.77 | 0.60 | 10.31 | ||||||||||||
1995 | 0.61 | 0.11 | b | 0.59 | 1.21 | 1.64 | 2.96 | 2.33 | 0.39 | 0.85 | 1.01 | 2.22 | 1.06 | 14.98 | ||||||||||||
1996 | 1.01 | a | 1.25 | 0.50 | a | 1.53 | 2.17 | 0.75 | 1.96 | 0.96 | 0.69 | 0.47 | 1.01 | p | 2.17 | 13.46 | a | |||||||||
1997 | 1.48 | 0.35 | 0.77 | 1.37 | 1.94 | 2.99 | 1.62 | 1.21 | 1.42 | 1.66 | 0.36 | 0.26 | a | 15.43 | ||||||||||||
1998 | 0.78 | a | 0.37 | 0.47 | a | 1.75 | 3.02 | 2.58 | 1.80 | 0.47 | 1.38 | 0.17 | 0.89 | 1.46 | d | 15.14 | ||||||||||
1999 | 1.04 | a | 1.10 | 1.34 | 0.45 | 1.42 | 1.29 | 0.05 | 1.38 | 0.15 | 0.14 | 0.79 | 0.39 | 9.54 | ||||||||||||
2000 | 1.26 | 0.78 | 0.55 | a | 0.64 | 1.55 | 0.70 | a | 0.14 | 0.02 | 1.08 | 2.17 | a | 0.90 | b | 0.67 | 10.46 | |||||||||
2001 | 0.42 | a | 0.38 | 0.83 | a | 0.82 | a | 0.75 | 2.63 | 1.42 | 0.54 | 1.27 | a | 1.07 | a | 0.37 | c | 0.47 | 10.97 | |||||||
2002 | 1.26 | a | 0.24 | 0.85 | 0.83 | 1.45 | 1.68 | d | 1.54 | d | 1.80 | a | 0.77 | c | 0.23 | 0.90 | a | 0.46 | a | 12.01 | ||||||
2003 | 1.52 | 1.09 | 1.38 | c | 2.00 | 1.24 | 0.64 | 0.23 | 1.52 | 0.31 | 0.50 | 0.55 | 1.41 | a | 12.39 | |||||||||||
2004 | 0.44 | 0.51 | 0.50 | 1.05 | 2.88 | 1.85 | 1.59 | d | 2.02 | 1.72 | 0.27 | 0.31 | 0.50 | 13.64 | ||||||||||||
2005 | 0.24 | 0.34 | b | 0.78 | a | 0.96 | 2.51 | 2.84 | a | 0.41 | 0.69 | a | 1.06 | a | 1.41 | a | 2.00 | b | 1.00 | a | 14.24 | |||||
2006 | 0.91 | a | 0.32 | 0.47 | a | 1.70 | b | 0.49 | a | 1.98 | b | 0.46 | d | 0.18 | 0.79 | 1.26 | 1.09 | h | 0.52 | 9.08 | a | |||||
2007 | 0.57 | a | 0.64 | 0.86 | 1.04 | a | 2.83 | b | 1.42 | 1.12 | 0.22 | 1.81 | 1.48 | b | 0.66 | a | 1.34 | 13.99 | ||||||||
2008 | 0.42 | b | 0.74 | b | 0.86 | 1.01 | 1.15 | a | 2.09 | 0.66 | 0.29 | 1.78 | 0.40 | 1.11 | j | 0.66 | 10.06 | a | ||||||||
2009 | 1.29 | a | 0.02 | 1.25 | a | 0.57 | 1.52 | a | 3.13 | a | 1.08 | 1.82 | a | 0.72 | 0.56 | 0.37 | 0.42 | 12.75 | ||||||||
2010 | 0.55 | 0.24 | 0.80 | 0.84 | 2.73 | f | 3.46 | c | 1.15 | 1.37 | b | 1.71 | 1.40 | b | 1.29 | 1.70 | b | 14.51 | a | |||||||
2011 | 0.51 | w | 0.63 | b | 0.75 | f | 0.40 | v | 2.49 | q | 2.30 | o | 1.31 | x | 0.31 | y | 0.64 | c | 0.81 | i | 0.60 | f | 1.23 | x | 1.27 | j |
2012 | 0.76 | v | 0.41 | d | 1.74 | d | 0.97 | f | 1.35 | c | 0.97 | w | 1.04 | j | 0.34 | d | ----- | z | 0.51 | f | 1.73 | j | 0.91 | 4.75 | g | |
2013 | 0.82 | f | 0.15 | a | 0.20 | e | 0.46 | e | 1.34 | c | 2.37 | k | 0.46 | a | 0.51 | h | 4.11 | d | 0.21 | g | 0.30 | j | 0.98 | e | 7.70 | e |
2014 | 0.91 | e | 1.70 | 0.71 | b | 0.99 | c | 0.65 | 2.08 | 0.63 | d | 2.97 | c | 0.85 | 1.18 | c | 0.84 | 1.34 | b | 14.85 | ||||||
2015 | 0.34 | 0.34 | a | 0.19 | d | 0.74 | 1.63 | 0.69 | 1.65 | 0.11 | 2.44 | a | 0.64 | d | 0.96 | b | 1.24 | d | 10.97 | |||||||
2016 | 0.21 | h | 0.28 | 0.51 | h | 1.23 | h | 2.67 | h | 0.58 | 0.51 | c | 0.17 | e | 2.37 | 2.23 | 0.75 | r | 0.77 | k | 6.14 | f | ||||
2017 | 0.51 | h | 0.89 | b | 0.46 | n | 1.37 | b | 2.17 | i | 2.47 | 0.53 | 0.60 | 1.74 | 0.21 | n | 1.74 | a | 0.84 | a | 10.18 | d | ||||
2018 | 0.99 | g | 0.65 | 0.47 | 1.34 | 2.24 | 2.20 | e | 0.06 | b | 0.91 | 0.90 | 0.94 | ----- | z | 0.13 | 9.84 | b | ||||||||
2019 | 0.06 | o | 1.89 | 0.36 | 1.47 | 1.08 | 0.92 | 0.75 | a | 1.84 | 2.49 | 0.78 | 0.05 | 0.15 | 11.78 | a | ||||||||||
2020 | 0.48 | 1.20 | 0.41 | 0.18 | 2.23 | 4.28 | a | 0.20 | i | 0.75 | 0.28 | 0.77 | 0.77 | 0.35 | 11.70 | a | ||||||||||
2021 | 0.18 | 1.50 | 0.14 | 0.08 | 1.55 | f | 0.13 | 0.46 | f | 1.41 | d | 0.12 | f | 0.58 | a | 0.23 | 0.67 | 4.92 | c | |||||||
2022 | 0.74 | 0.17 | 0.49 | 0.27 | 1.12 | d | 1.62 | e | 1.10 | 1.67 | 0.63 | 0.30 | 0.96 | 0.56 | 9.63 | |||||||||||
2023 | 0.52 | 0.24 | 0.48 | 0.60 | 0.30 | q | 3.58 | p | 0.24 | 1.60 | 0.73 | d | ----- | z | 0.68 | t | ----- | z | 4.41 | e | ||||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 0.69 | 0.57 | 0.71 | 0.93 | 1.64 | 1.93 | 1.05 | 1.05 | 1.07 | 0.84 | 0.76 | 0.76 | 11.88 | |||||||||||||
S.D. | 0.40 | 0.39 | 0.37 | 0.50 | 0.85 | 0.99 | 0.73 | 0.71 | 0.81 | 0.59 | 0.48 | 0.48 | 2.31 | |||||||||||||
SKEW | 0.92 | 1.01 | 1.00 | 0.28 | 0.61 | 0.43 | 0.79 | 0.62 | 0.99 | 0.88 | 0.92 | 1.30 | -0.34 | |||||||||||||
MAX | 1.90 | 1.89 | 2.11 | 2.01 | 4.32 | 4.28 | 3.26 | 2.97 | 4.11 | 2.67 | 2.22 | 2.56 | 15.74 | |||||||||||||
MIN | 0.04 | 0.02 | 0.13 | 0.08 | 0.08 | 0.13 | 0.00 | 0.02 | 0.01 | 0.00 | 0.00 | 0.13 | 5.60 | |||||||||||||
YRS | 82 | 90 | 88 | 83 | 82 | 85 | 88 | 88 | 88 | 85 | 82 | 87 | 66 |