YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1927 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.06 | 0.00 | 0.07 | 0.52 | 1.01 | 0.28 | 0.47 | ----- | z | |||||||
1928 | 0.54 | 0.15 | 0.45 | 0.32 | 0.06 | 0.17 | 0.15 | 0.17 | 0.11 | 0.23 | 1.11 | 0.49 | a | 1.11 | a | |||||||||||
1929 | 0.27 | ----- | z | 0.32 | ----- | z | 0.36 | 0.27 | ----- | z | ----- | z | ----- | z | 0.14 | ----- | z | 0.90 | ----- | z | ||||||
1930 | 0.49 | 0.40 | 0.21 | 0.23 | 0.07 | 0.23 | 0.02 | 0.07 | 0.13 | 0.10 | ----- | z | ----- | z | ----- | z | ||||||||||
1931 | 0.76 | 0.29 | 1.18 | 0.15 | 0.03 | 1.06 | 0.11 | 0.00 | 0.04 | 0.33 | 0.68 | 1.01 | 1.18 | |||||||||||||
1932 | 0.90 | 0.81 | 0.29 | 0.20 | 0.95 | 0.00 | 0.00 | 0.00 | 0.00 | 0.24 | 0.74 | 1.24 | 1.24 | |||||||||||||
1933 | 0.74 | 0.11 | 0.30 | 0.00 | 0.41 | 0.28 | 0.00 | 0.00 | 0.50 | 0.48 | 0.23 | 1.00 | 1.00 | |||||||||||||
1934 | 0.50 | 0.20 | 0.28 | 0.60 | 0.00 | 0.13 | 0.00 | 0.50 | 0.32 | 0.79 | 0.48 | 0.35 | 0.79 | |||||||||||||
1935 | 0.54 | 0.30 | 1.20 | 0.68 | 0.35 | 0.30 | 0.30 | 0.00 | 0.00 | 0.40 | 0.28 | 0.40 | a | 1.20 | a | |||||||||||
1936 | ----- | z | ----- | z | 0.25 | 0.12 | 0.32 | 0.60 | 0.00 | 0.00 | 0.00 | 0.08 | 0.00 | a | 0.30 | ----- | z | |||||||||
1937 | 0.40 | 0.80 | 0.47 | 1.05 | 0.20 | 0.57 | 0.12 | 0.16 | 0.26 | 0.52 | 0.70 | 0.80 | 1.05 | |||||||||||||
1938 | 0.56 | 0.40 | 0.70 | 0.15 | 0.30 | 0.80 | 0.08 | 0.00 | 0.08 | 0.48 | 0.18 | 0.70 | 0.80 | |||||||||||||
1939 | 0.36 | 0.62 | 0.22 | 0.00 | 0.08 | 0.28 | a | 0.09 | 0.34 | 0.15 | 0.10 | 0.00 | 0.87 | 0.87 | a | |||||||||||
1940 | 0.43 | 1.04 | 0.40 | 0.45 | 0.30 | 0.06 | 0.19 | 0.00 | 0.35 | 0.70 | 0.82 | 1.15 | 1.15 | |||||||||||||
1941 | 0.75 | 0.30 | 0.50 | 0.60 | 0.64 | 0.55 | 0.00 | 0.23 | 0.12 | 0.31 | a | 0.96 | 0.65 | 0.96 | a | |||||||||||
1942 | 0.37 | 0.54 | 0.00 | 0.08 | 0.49 | 0.52 | 0.16 | 0.10 | 0.11 | 0.05 | 0.75 | 1.26 | 1.26 | |||||||||||||
1943 | 0.30 | 0.54 | 0.54 | 0.65 | 0.18 | ----- | z | ----- | z | ----- | z | 0.00 | b | 0.72 | 0.25 | d | 0.35 | ----- | z | |||||||
1944 | 0.42 | 0.25 | 0.14 | 0.27 | 0.16 | 0.57 | 0.00 | d | 0.00 | j | 0.28 | a | 0.11 | 0.40 | u | 0.43 | a | ----- | z | |||||||
1945 | 0.20 | 0.37 | 0.25 | 0.35 | 0.74 | 0.07 | 0.00 | 0.11 | 0.24 | 0.59 | 0.61 | 1.22 | a | 1.22 | a | |||||||||||
1946 | 0.26 | 0.53 | a | 0.28 | 0.08 | 0.67 | c | 0.35 | 0.15 | a | 0.98 | b | 0.08 | a | 0.57 | a | 0.55 | 0.06 | 0.98 | i | ||||||
1947 | 0.27 | a | 0.23 | 0.41 | 0.23 | b | 0.05 | b | 0.31 | e | 0.50 | a | 0.01 | 0.29 | a | 0.66 | 0.30 | 0.13 | a | 0.66 | m | |||||
1948 | 1.09 | 0.57 | 0.44 | b | 0.12 | a | 0.48 | c | 0.36 | a | 0.20 | 0.27 | 0.42 | 0.19 | 0.86 | 0.51 | 1.09 | g | ||||||||
1949 | 0.25 | 0.85 | 0.44 | 0.00 | 0.16 | 0.00 | 0.02 | 0.00 | 0.26 | 0.12 | 1.30 | k | 0.30 | 1.30 | k | |||||||||||
1950 | 0.60 | 0.30 | d | 0.35 | 0.48 | 0.06 | 0.95 | 0.00 | b | 0.00 | 0.06 | 0.81 | 1.00 | 0.35 | k | 1.00 | q | |||||||||
1951 | 0.40 | g | 0.30 | k | 0.60 | c | 0.44 | 0.50 | 0.78 | 0.60 | 0.09 | 0.24 | 0.45 | a | 0.60 | 0.77 | 0.78 | v | ||||||||
1952 | 1.25 | 0.45 | ----- | z | 0.00 | a | 0.28 | 0.60 | 0.00 | 0.00 | 0.13 | ----- | z | ----- | z | ----- | z | ----- | z | |||||||
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.22 | 0.00 | ----- | z | ----- | z | 0.11 | n | 1.10 | 1.13 | ----- | z | ||||
1954 | 1.70 | 0.50 | 0.40 | 0.35 | 0.13 | 0.15 | ----- | z | ----- | z | ----- | z | ----- | z | 0.09 | r | 0.35 | ----- | z | |||||||
1955 | 0.27 | 0.24 | 0.34 | 0.52 | 0.43 | 0.25 | 0.38 | 0.00 | 0.22 | 0.37 | 0.73 | 1.72 | 1.72 | |||||||||||||
1956 | 0.83 | 0.78 | 0.31 | 0.01 | 0.41 | 0.66 | 0.02 | 0.22 | 0.22 | 0.58 | 0.15 | 0.38 | 0.83 | |||||||||||||
1957 | 0.24 | 0.64 | 0.58 | 0.37 | 0.41 | 0.20 | 0.22 | 0.09 | 0.65 | 0.45 | 0.28 | 0.41 | 0.65 | |||||||||||||
1958 | 0.70 | 1.01 | 0.22 | 0.41 | 0.34 | 0.18 | 0.11 | 0.00 | 0.04 | 0.23 | 1.18 | 0.41 | 1.18 | |||||||||||||
1959 | 0.64 | 0.38 | 0.45 | 0.10 | 0.23 | 0.12 | 0.00 | ----- | z | 0.44 | 0.10 | b | 0.30 | ----- | z | ----- | z | |||||||||
1960 | 0.26 | 1.00 | 0.83 | a | 0.40 | 0.16 | 0.23 | 0.28 | 0.09 | 0.06 | 0.31 | 1.94 | 0.58 | 1.94 | a | |||||||||||
1961 | 0.53 | 1.42 | 0.43 | 0.25 | 0.43 | 0.23 | 0.25 | 0.07 | 0.05 | 0.45 | 0.40 | 0.90 | 1.42 | |||||||||||||
1962 | 0.21 | 0.50 | 0.42 | 1.05 | 0.47 | 0.17 | 0.00 | 0.22 | 0.67 | 0.62 | 0.95 | 0.29 | 1.05 | |||||||||||||
1963 | 0.60 | 0.58 | 0.43 | 0.36 | 0.36 | 0.26 | 0.21 | 0.05 | 0.11 | 0.14 | 0.39 | 0.62 | 0.62 | |||||||||||||
1964 | 0.70 | 0.03 | 0.32 | 0.17 | 0.00 | 0.25 | 0.10 | 0.07 | 0.37 | 0.24 | 0.90 | 3.30 | 3.30 | |||||||||||||
1965 | 0.52 | 0.46 | 0.23 | 0.34 | 0.22 | 0.44 | 0.12 | ----- | z | 0.31 | 0.09 | 0.42 | 0.63 | ----- | z | |||||||||||
1966 | 0.91 | 0.35 | 0.54 | 0.09 | 0.00 | 0.05 | 1.35 | 0.00 | 0.30 | 0.35 | 0.91 | 0.61 | 1.35 | |||||||||||||
1967 | 0.54 | 0.36 | 0.24 | 0.34 | 0.34 | 0.35 | 0.00 | 0.00 | 0.01 | 0.65 | 0.46 | 0.31 | 0.65 | |||||||||||||
1968 | 0.88 | 1.25 | 0.14 | 0.03 | 0.19 | ----- | z | 0.00 | 0.42 | 0.15 | 0.52 | 0.47 | 0.56 | ----- | z | |||||||||||
1969 | 0.54 | a | 0.29 | 0.11 | 0.14 | 0.48 | 0.40 | 0.00 | 0.00 | 0.42 | 0.10 | 0.25 | 0.84 | 0.84 | a | |||||||||||
1970 | 1.23 | 0.51 | 0.28 | 0.20 | 0.07 | 0.15 | 0.03 | 0.00 | 0.09 | 0.38 | 1.25 | ----- | z | ----- | z | |||||||||||
1971 | 1.50 | 0.50 | 0.66 | 0.20 | 0.30 | 0.60 | 0.00 | 0.22 | 1.07 | 0.62 | 0.33 | 0.48 | 1.50 | |||||||||||||
1972 | 0.84 | 0.64 | 0.31 | 0.18 | 0.98 | 0.49 | 0.04 | 0.13 | 0.15 | 0.05 | 0.39 | 0.70 | 0.98 | |||||||||||||
1973 | 0.57 | 0.21 | 0.17 | 0.11 | 0.08 | 0.04 | 0.00 | ----- | z | 0.20 | 0.68 | 0.65 | 0.48 | ----- | z | |||||||||||
1974 | 1.78 | 0.42 | 0.67 | 0.83 | 0.10 | 0.22 | 0.55 | 0.00 | 0.00 | 0.10 | 0.31 | 0.42 | 1.78 | |||||||||||||
1975 | 0.61 | 0.70 | 0.34 | 0.36 | 0.38 | 0.17 | 0.20 | 0.41 | 0.00 | 0.66 | 0.34 | 0.83 | 0.83 | |||||||||||||
1976 | 0.40 | 0.41 | 0.57 | 0.14 | 0.13 | 0.13 | 0.08 | 0.49 | 0.11 | 0.15 | 0.03 | 0.11 | 0.57 | |||||||||||||
1977 | 0.10 | 0.51 | 0.15 | 0.00 | 0.60 | 0.18 | 0.16 | 0.73 | 0.24 | 0.21 | 0.64 | 1.43 | 1.43 | |||||||||||||
1978 | 0.62 | 0.40 | 0.10 | 0.38 | 0.36 | 0.12 | 0.69 | 0.38 | 0.48 | 0.03 | 0.93 | 0.45 | 0.93 | |||||||||||||
1979 | 0.90 | d | 0.55 | 0.23 | 0.26 | 0.10 | 0.10 | 0.08 | 0.38 | 0.20 | 0.43 | 0.52 | 0.55 | 0.90 | d | |||||||||||
1980 | 1.59 | 0.45 | 0.22 | 0.43 | 0.45 | 0.56 | 0.02 | 0.08 | 0.30 | 0.25 | 1.06 | 1.19 | 1.59 | |||||||||||||
1981 | 0.26 | 0.86 | 0.04 | 0.06 | 0.41 | 0.59 | 0.13 | 0.00 | 0.84 | 0.27 | 0.50 | 1.04 | 1.04 | |||||||||||||
1982 | 0.22 | a | 0.51 | 0.41 | a | 0.48 | 0.09 | 0.35 | 0.16 | c | 0.14 | 0.48 | 1.11 | 0.62 | 0.72 | 1.11 | e | |||||||||
1983 | 0.38 | 0.88 | a | 0.77 | a | 0.25 | a | 0.29 | 0.57 | 0.17 | 0.20 | 0.40 | 0.30 | 0.76 | e | 0.42 | b | 0.88 | j | |||||||
1984 | 0.13 | 0.40 | a | 0.34 | 0.27 | 0.44 | 0.51 | 0.00 | 0.01 | 0.48 | 0.07 | 1.39 | 0.27 | 1.39 | a | |||||||||||
1985 | 0.11 | 0.32 | 0.36 | 0.05 | 0.08 | 0.38 | 0.03 | 0.06 | 0.64 | 0.70 | 0.27 | 0.37 | 0.70 | |||||||||||||
1986 | 0.61 | 0.42 | 0.42 | 0.20 | 0.48 | 0.04 | 0.22 | 0.04 | 0.34 | 0.42 | 0.83 | 0.40 | 0.83 | |||||||||||||
1987 | 0.50 | 0.52 | b | 0.45 | 0.12 | 0.30 | 0.06 | 0.60 | 0.02 | 0.01 | 0.01 | 0.32 | 1.77 | 1.77 | b | |||||||||||
1988 | 0.47 | 0.03 | 0.35 | 0.61 | 0.12 | 0.14 | 0.13 | 0.00 | 0.12 | 0.02 | 0.88 | 0.45 | 0.88 | |||||||||||||
1989 | 0.27 | 0.51 | 0.48 | 0.66 | 0.32 | 0.07 | 0.09 | 0.42 | 0.06 | 0.25 | 0.41 | 0.23 | 0.66 | |||||||||||||
1990 | 0.58 | 0.22 | 0.34 | 0.24 | 0.72 | ----- | z | 0.11 | 1.16 | ----- | z | 0.58 | 0.15 | 0.37 | ----- | z | ||||||||||
1991 | 0.17 | 0.26 | 0.50 | 0.21 | 0.28 | 1.29 | 0.13 | 0.11 | 0.00 | 0.48 | 0.41 | 0.20 | 1.29 | |||||||||||||
1992 | 0.23 | 1.13 | 0.22 | 0.60 | 0.13 | 0.29 | ----- | z | 0.53 | 0.21 | 0.28 | 0.31 | 0.44 | ----- | z | |||||||||||
1993 | 0.57 | 0.52 | 0.44 | b | 0.12 | 0.52 | 0.32 | 0.16 | 0.13 | 0.10 | 0.00 | 0.09 | a | 0.38 | 0.57 | c | ||||||||||
1994 | 0.34 | 0.65 | 0.11 | 0.22 | 0.72 | 0.16 | ----- | z | 0.00 | 0.17 | 0.41 | ----- | z | 0.42 | ----- | z | ||||||||||
1995 | 0.70 | 0.35 | ----- | z | ----- | z | 1.06 | ----- | z | 0.65 | ----- | z | 0.63 | ----- | z | 0.38 | 1.12 | b | ----- | z | ||||||
1996 | 0.35 | 0.65 | ----- | z | 0.72 | 0.31 | 0.03 | 0.03 | 0.00 | 0.37 | 0.30 | 2.08 | 0.80 | ----- | z | |||||||||||
1997 | 0.77 | 0.43 | ----- | z | 0.37 | 0.15 | 0.41 | ----- | z | ----- | z | ----- | z | 1.23 | ----- | z | 0.26 | ----- | z | |||||||
1998 | 0.76 | 0.40 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.55 | 0.04 | ----- | z | ----- | z | ----- | z | ||||
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 | 0.22 | 0.26 | ----- | z | ||
2001 | 0.08 | 0.21 | 0.32 | a | 0.69 | a | 0.17 | 0.33 | 0.22 | 0.13 | 0.17 | 0.28 | b | 0.73 | a | 0.67 | 0.73 | e | ||||||||
2002 | 0.57 | b | 0.51 | a | 0.41 | a | 0.40 | 0.52 | a | 0.59 | 0.10 | 0.21 | 0.01 | 0.21 | c | 0.57 | 0.78 | a | 0.78 | i | ||||||
2003 | 0.65 | b | 0.40 | 0.55 | b | 0.85 | 0.17 | b | 0.00 | 0.00 | 0.47 | 0.00 | b | 0.21 | 0.22 | 0.40 | 0.85 | h | ||||||||
2004 | 0.60 | 0.60 | c | 0.39 | 0.25 | 0.23 | 1.18 | 0.10 | 0.32 | 0.04 | 0.17 | 0.11 | a | 0.82 | 1.18 | d | ||||||||||
2005 | 0.42 | 0.12 | c | 0.78 | 0.35 | 0.26 | b | 0.35 | 0.00 | h | 0.00 | m | 0.16 | a | 0.77 | d | 0.66 | b | 0.74 | ----- | z | |||||
2006 | 0.81 | b | 0.68 | d | 0.25 | b | 0.51 | h | 0.63 | g | 0.69 | g | 0.00 | c | 0.00 | d | 0.15 | c | 0.47 | b | 0.80 | e | 1.02 | ----- | z | |
2007 | 0.51 | a | 0.49 | b | 0.25 | i | 0.35 | o | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.25 | v | 0.77 | s | 1.48 | q | ----- | z |
2008 | 0.75 | u | 0.62 | 0.29 | 0.52 | 0.66 | 0.20 | 0.02 | 0.04 | 0.26 | 0.53 | e | 0.56 | 0.45 | ----- | z | ||||||||||
2009 | 0.35 | 0.31 | 0.46 | 0.13 | 0.80 | 0.62 | 0.12 | 0.59 | 0.17 | 0.84 | 0.32 | 0.70 | 0.84 | |||||||||||||
2010 | 0.61 | 0.40 | 0.32 | 0.41 | 0.60 | 0.52 | 0.15 | 0.00 | 0.72 | 0.62 | 0.75 | 0.79 | 0.79 | |||||||||||||
2011 | 0.37 | 0.30 | 0.81 | 0.39 | 1.37 | 0.36 | 0.16 | 0.04 | 0.02 | 0.27 | 0.37 | 1.00 | 1.37 | |||||||||||||
2012 | 0.95 | 0.37 | 1.56 | 0.36 | 0.15 | 0.45 | 0.24 | 0.00 | 0.00 | a | 0.51 | 1.22 | 0.96 | 1.56 | a | |||||||||||
2013 | 0.26 | 0.06 | 0.44 | 0.35 | 0.87 | 0.53 | 0.02 | 0.54 | 0.60 | 0.69 | 0.40 | 0.96 | 0.96 | |||||||||||||
2014 | 0.64 | 0.68 | 0.83 | 0.37 | 0.22 | c | 0.17 | 0.05 | 1.56 | 0.45 | 0.56 | a | 0.94 | 0.54 | 1.56 | d | ||||||||||
2015 | 0.74 | 0.55 | 0.80 | 0.09 | k | 0.86 | a | 0.00 | 0.00 | 0.03 | 0.00 | 0.25 | 0.33 | 1.09 | 1.09 | l | ||||||||||
2016 | 0.60 | 0.22 | 0.55 | 0.26 | 0.55 | 0.29 | 0.12 | 0.00 | 0.18 | 1.09 | 0.71 | 0.40 | 1.09 | |||||||||||||
2017 | 0.45 | 0.89 | 0.44 | 0.64 | 0.20 | 0.00 | 0.00 | 0.00 | n | ----- | z | 0.46 | 0.68 | 0.37 | ----- | z | ||||||||||
2018 | 0.46 | 0.21 | 0.21 | 0.58 | 0.37 | f | 0.25 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | |||||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 0.58 | 0.49 | 0.42 | 0.33 | 0.36 | 0.34 | 0.14 | 0.19 | 0.24 | 0.40 | 0.60 | 0.68 | 1.14 | |||||||||||||
S.D. | 0.34 | 0.27 | 0.26 | 0.24 | 0.27 | 0.27 | 0.21 | 0.28 | 0.22 | 0.28 | 0.39 | 0.46 | 0.46 | |||||||||||||
SKEW | 1.44 | 0.99 | 1.77 | 0.89 | 1.18 | 1.28 | 3.09 | 2.56 | 1.19 | 0.75 | 1.26 | 2.58 | 2.13 | |||||||||||||
MAX | 1.78 | 1.42 | 1.56 | 1.05 | 1.37 | 1.29 | 1.35 | 1.56 | 1.07 | 1.23 | 2.08 | 3.30 | 3.30 | |||||||||||||
MIN | 0.08 | 0.03 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.06 | 0.57 | |||||||||||||
YRS | 85 | 85 | 82 | 82 | 84 | 83 | 80 | 75 | 82 | 84 | 80 | 83 | 51 |