YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1940 | ----- | z | ----- | z | ----- | z | ----- | z | 1.00 | 1.49 | p | 0.41 | x | 1.22 | 0.35 | y | 1.40 | ----- | z | ----- | z | ----- | z | |||
1941 | ----- | z | ----- | z | ----- | z | 1.45 | 1.10 | 1.00 | 0.47 | u | 1.25 | 2.02 | 1.37 | ----- | z | ----- | z | ----- | z | ||||||
1942 | ----- | z | ----- | z | 1.53 | 0.67 | 1.63 | 1.50 | 0.80 | 1.05 | 1.47 | ----- | z | 0.22 | ----- | z | ----- | z | ||||||||
1943 | ----- | z | ----- | z | 0.09 | b | 0.27 | 1.55 | 3.00 | 1.17 | 2.04 | 0.59 | 1.43 | 1.79 | ----- | z | ----- | z | ||||||||
1944 | ----- | z | ----- | z | 0.47 | y | 1.67 | 1.32 | 0.88 | 0.78 | 0.83 | 0.38 | 0.38 | 0.54 | ----- | z | ----- | z | ||||||||
1945 | ----- | z | ----- | z | 0.76 | 1.10 | 2.00 | 1.10 | 3.63 | 0.85 | 1.00 | 0.43 | 0.73 | 0.65 | ----- | z | ||||||||||
1946 | 0.20 | 0.69 | a | 0.52 | u | 0.42 | 2.18 | 1.30 | 1.77 | 0.43 | 2.09 | 0.80 | 0.66 | 0.12 | a | 2.18 | w | |||||||||
1947 | 0.35 | a | 0.70 | 0.10 | 1.63 | 0.38 | 1.65 | 2.34 | 1.40 | 0.67 | 0.60 | 0.73 | 0.55 | 2.34 | a | |||||||||||
1948 | 0.15 | 0.96 | a | 0.55 | 0.60 | 0.51 | 0.95 | 0.95 | 1.92 | a | 0.82 | 0.59 | ----- | z | 0.01 | ----- | z | |||||||||
1949 | 0.96 | 0.02 | 0.91 | 0.32 | 0.50 | 0.84 | 1.31 | 0.22 | 0.66 | 0.59 | 0.17 | 0.21 | 1.31 | |||||||||||||
1950 | 0.23 | 0.13 | 1.32 | 0.62 | 1.14 | 0.48 | 0.95 | 1.05 | 0.46 | 1.00 | 0.35 | 0.35 | 1.32 | |||||||||||||
1951 | 0.19 | 0.96 | 0.45 | 0.65 | 1.05 | 1.70 | 0.94 | 1.05 | 0.70 | 0.67 | 0.31 | 0.49 | 1.70 | |||||||||||||
1952 | 0.70 | 0.65 | 0.95 | 0.50 | 0.69 | 2.03 | 2.51 | 0.96 | 0.71 | 0.00 | 0.29 | 0.13 | 2.51 | |||||||||||||
1953 | 0.50 | 0.80 | 0.52 | 1.10 | 1.16 | 1.81 | 1.85 | 1.69 | 0.94 | 0.32 | 0.77 | 0.70 | 1.85 | |||||||||||||
1954 | 0.08 | 1.10 | 0.64 | a | 1.10 | 1.10 | 0.93 | 1.50 | 2.01 | 1.24 | 0.61 | 0.12 | 0.13 | 2.01 | a | |||||||||||
1955 | 0.11 | 0.42 | 0.33 | 1.00 | 0.26 | 0.63 | 1.54 | 1.48 | 0.49 | 0.19 | 0.27 | 0.26 | 1.54 | |||||||||||||
1956 | 0.22 | 0.09 | 0.30 | 0.84 | 0.77 | 2.46 | 1.48 | 1.70 | 0.20 | 0.40 | 1.29 | 0.10 | 2.46 | |||||||||||||
1957 | 0.02 | 0.45 | 1.04 | 0.42 | 1.36 | 2.92 | 0.97 | 1.21 | a | 0.91 | 0.77 | 0.65 | 0.25 | 2.92 | a | |||||||||||
1958 | 0.30 | 0.31 | 0.27 | 1.00 | 0.42 | 0.53 | 1.19 | 0.67 | 1.60 | 0.33 | 0.52 | 0.10 | 1.60 | |||||||||||||
1959 | 0.17 | 0.21 | 0.15 | 0.22 | 1.55 | 1.45 | 0.51 | 2.50 | 0.37 | 0.49 | 0.49 | 1.19 | 2.50 | |||||||||||||
1960 | 0.35 | 0.01 | 0.32 | 0.77 | 0.83 | 1.42 | 1.50 | 2.46 | 0.88 | 0.63 | 1.07 | 0.18 | 2.46 | |||||||||||||
1961 | 0.02 | 0.37 | 0.34 | 0.42 | 1.59 | 1.34 | 1.63 | 0.34 | 0.67 | 1.07 | 0.76 | 0.26 | 1.63 | |||||||||||||
1962 | 0.08 | 0.49 | 0.31 | 0.58 | 1.41 | 1.42 | 1.76 | 1.95 | 0.61 | 0.93 | 0.20 | 0.10 | 1.95 | |||||||||||||
1963 | 0.22 | 0.20 | 0.34 | 1.63 | 2.20 | 0.63 | 1.92 | 0.38 | 0.94 | 0.26 | 0.24 | 0.30 | 2.20 | |||||||||||||
1964 | 0.05 | 0.09 | 0.40 | 2.01 | 0.79 | 0.29 | 0.45 | 0.92 | 0.83 | 0.13 | 0.18 | 0.22 | 2.01 | |||||||||||||
1965 | 0.14 | 0.98 | 0.84 | 1.30 | 0.77 | 0.95 | 1.45 | 0.42 | 1.05 | 0.16 | a | 0.40 | 0.42 | 1.45 | a | |||||||||||
1966 | 0.21 | 0.70 | 0.30 | 1.06 | 0.61 | 0.30 | 1.28 | 2.02 | 0.39 | 2.05 | 0.21 | 0.30 | 2.05 | |||||||||||||
1967 | 0.40 | 0.64 | 0.21 | 1.41 | 0.36 | 2.30 | 0.52 | 2.98 | 0.21 | 0.29 | 0.03 | 0.69 | 2.98 | |||||||||||||
1968 | 0.42 | 0.07 | 0.67 | 1.34 | 0.67 | 1.17 | 2.82 | 0.67 | 1.21 | 2.52 | 0.27 | 0.85 | 2.82 | |||||||||||||
1969 | 0.40 | 0.55 | 1.13 | 1.08 | 0.62 | 0.82 | 0.97 | 0.85 | 0.55 | 0.50 | 0.20 | 0.55 | 1.13 | |||||||||||||
1970 | 0.10 | 0.23 | 0.32 | 0.92 | 1.33 | 1.29 | 1.28 | 1.66 | 0.64 | 1.07 | 1.00 | 0.75 | 1.66 | |||||||||||||
1971 | 0.15 | 1.20 | 0.10 | 0.49 | 0.82 | 1.40 | 0.45 | 0.90 | 0.39 | 1.48 | 0.96 | 0.24 | 1.48 | |||||||||||||
1972 | 0.36 | 0.50 | 0.45 | 2.14 | 1.24 | 0.82 | 0.85 | 0.25 | 0.79 | 0.95 | 0.92 | 0.64 | 2.14 | |||||||||||||
1973 | 0.34 | 0.23 | 0.67 | 0.67 | 0.75 | 0.58 | 0.84 | 0.46 | 0.68 | 6.13 | 1.52 | 0.32 | 6.13 | |||||||||||||
1974 | 0.00 | 0.36 | 0.18 | 0.89 | 1.03 | 1.09 | 1.02 | 1.62 | 0.26 | 0.30 | 0.10 | 0.11 | 1.62 | |||||||||||||
1975 | 2.01 | 0.29 | 0.50 | 1.33 | 0.22 | 0.62 | 0.62 | 0.49 | 1.02 | 0.44 | 1.63 | 0.26 | 2.01 | |||||||||||||
1976 | 0.42 | 0.09 | 0.73 | 1.02 | 0.29 | 1.72 | 0.39 | 0.76 | 0.51 | 0.41 | 0.06 | 0.13 | 1.72 | |||||||||||||
1977 | 0.27 | 0.72 | 0.79 | 0.64 | 2.05 | 2.31 | 1.91 | 1.36 | 1.19 | 1.44 | 2.25 | 0.74 | 2.31 | |||||||||||||
1978 | 0.06 | 0.12 | 0.55 | 1.17 | 0.82 | 0.58 | 2.51 | 1.41 | 1.25 | 0.14 | 0.30 | 0.41 | 2.51 | |||||||||||||
1979 | 0.49 | 0.38 | 0.87 | 0.41 | 1.76 | 1.55 | 1.70 | 2.64 | 1.43 | 2.01 | 0.51 | 0.07 | 2.64 | |||||||||||||
1980 | 0.16 | 0.33 | 0.21 | 0.44 | 0.92 | 1.33 | 0.61 | 1.75 | 0.56 | 1.01 | 0.06 | 0.18 | 1.75 | |||||||||||||
1981 | 0.19 | 0.87 | 1.10 | 0.48 | 0.43 | 1.23 | 1.61 | 1.79 | 0.39 | 1.33 | 0.34 | 0.59 | 1.79 | |||||||||||||
1982 | 0.27 | 0.06 | 0.45 | 1.56 | 1.07 | 1.72 | 3.51 | 1.43 | 1.66 | 0.69 | 0.95 | 0.58 | a | 3.51 | a | |||||||||||
1983 | 0.41 | 0.12 | 0.63 | 2.90 | 0.53 | 1.66 | 1.34 | 0.72 | 0.88 | 0.30 | 1.31 | 0.23 | 2.90 | |||||||||||||
1984 | 0.40 | 0.31 | 1.06 | 1.68 | 1.32 | 1.11 | 1.91 | 0.31 | 1.23 | 1.55 | 0.05 | 0.76 | 1.91 | |||||||||||||
1985 | 0.18 | 0.05 | 0.68 | 2.14 | 1.00 | 2.21 | 1.18 | 3.25 | 1.82 | 0.71 | 0.32 | 1.44 | 3.25 | |||||||||||||
1986 | ----- | z | ----- | z | ----- | z | 1.73 | n | 0.62 | 0.50 | 1.50 | 1.20 | 1.60 | 0.30 | 0.40 | a | 0.00 | ----- | z | |||||||
1987 | 0.40 | 0.65 | 1.83 | 0.26 | 1.09 | 1.30 | 1.40 | 0.65 | 0.80 | 0.35 | 1.15 | 0.86 | a | 1.83 | a | |||||||||||
1988 | 1.26 | 0.10 | 0.45 | 0.74 | 0.60 | 0.40 | 1.28 | 0.94 | 1.30 | 0.14 | 0.65 | ----- | z | ----- | z | |||||||||||
1989 | 0.25 | 0.18 | c | 0.85 | 0.77 | 0.53 | 2.00 | 1.88 | 0.50 | a | 2.47 | 0.58 | 0.30 | a | 0.15 | 2.47 | e | |||||||||
1990 | 0.00 | 0.40 | 0.65 | 1.00 | 1.37 | 2.75 | 2.75 | 3.40 | 0.37 | 1.42 | 0.19 | 0.22 | 3.40 | |||||||||||||
1991 | 0.15 | 0.25 | 1.30 | 1.10 | 1.47 | 2.42 | 2.68 | 1.15 | 2.85 | 0.50 | 1.20 | 0.14 | 2.85 | |||||||||||||
1992 | 0.25 | 0.25 | 0.80 | 0.55 | 0.75 | a | 4.45 | a | 1.80 | 1.78 | 0.65 | h | ----- | z | 1.15 | 0.22 | ----- | z | ||||||||
1993 | 0.10 | w | 0.28 | 0.85 | s | 0.48 | a | 2.35 | s | 4.80 | 1.40 | 2.00 | 1.20 | 0.45 | 0.95 | w | 0.12 | ----- | z | |||||||
1994 | 0.15 | b | 0.48 | c | ----- | z | 1.38 | v | 1.11 | 1.74 | 1.20 | 6.80 | 1.10 | 0.63 | o | 0.34 | 0.14 | ----- | z | |||||||
1995 | ----- | z | ----- | z | 1.30 | 1.30 | 1.02 | w | 1.13 | 1.77 | a | 0.87 | l | 2.78 | 0.55 | 0.30 | 0.35 | ----- | z | |||||||
1996 | 0.56 | 0.05 | 2.02 | 0.30 | y | 0.90 | q | 1.23 | v | 1.06 | 2.40 | e | 0.75 | 1.20 | 1.50 | t | 0.37 | a | ----- | z | ||||||
1997 | 1.45 | r | 0.15 | 1.10 | a | 1.43 | x | 0.55 | v | 1.60 | x | 2.85 | 0.83 | w | 0.40 | x | 0.85 | 0.66 | 0.10 | ----- | z | |||||
1998 | 0.75 | 0.55 | 1.00 | 0.30 | 0.68 | 1.70 | 1.30 | 0.75 | 0.83 | 1.28 | 0.85 | 0.32 | 1.70 | |||||||||||||
1999 | 0.44 | 0.11 | 0.54 | 1.20 | 1.17 | 0.53 | 0.40 | 3.25 | 1.07 | 0.75 | 0.03 | 0.32 | 3.25 | |||||||||||||
2000 | 0.42 | 0.64 | 0.60 | 0.40 | 0.82 | 0.80 | 3.50 | 1.55 | 0.10 | 0.50 | 1.20 | 0.42 | 3.50 | |||||||||||||
2001 | 1.69 | 0.60 | 1.05 | 1.50 | 0.55 | 1.25 | 0.90 | 0.15 | c | 3.00 | 0.24 | 2.38 | a | 0.14 | 3.00 | d | ||||||||||
2002 | 0.15 | 0.32 | 1.20 | b | 0.60 | 1.29 | 2.93 | 1.30 | 1.76 | 0.20 | 2.33 | 0.10 | 0.22 | 2.93 | b | |||||||||||
2003 | 0.17 | 0.58 | 0.54 | b | 3.08 | 0.83 | 1.00 | 1.20 | 0.64 | 3.19 | 0.58 | 0.75 | 0.00 | r | 3.19 | t | ||||||||||
2004 | 0.11 | 0.21 | 0.45 | 0.88 | 2.90 | 1.55 | 1.25 | 1.01 | 1.38 | 0.77 | 0.52 | 0.00 | 2.90 | |||||||||||||
2005 | 0.52 | f | 0.40 | 0.23 | 1.08 | 1.05 | 0.96 | 1.20 | 1.05 | 2.26 | 1.11 | 0.78 | 0.97 | 2.26 | f | |||||||||||
2006 | 0.16 | 0.36 | b | 1.19 | 0.98 | 0.29 | 0.72 | 1.06 | 1.56 | 1.02 | 0.16 | 0.74 | 0.87 | g | 1.56 | i | ||||||||||
2007 | 0.21 | 0.52 | 0.78 | a | 1.42 | 2.02 | 0.73 | 0.26 | 4.25 | 1.48 | 1.98 | 0.08 | 0.35 | 4.25 | a | |||||||||||
2008 | 0.01 | 0.13 | 0.25 | 1.07 | 0.71 | 1.18 | 0.86 | 1.29 | 0.94 | 1.54 | 1.02 | 0.32 | 1.54 | |||||||||||||
2009 | 0.30 | 0.13 | 1.41 | 0.38 | 0.62 | 0.93 | 0.53 | 0.88 | 1.64 | 1.60 | 0.10 | 0.42 | 1.64 | |||||||||||||
2010 | 0.80 | 0.18 | 0.61 | 0.29 | 1.25 | 1.86 | 1.51 | 1.27 | 2.50 | 0.89 | 0.41 | c | 0.51 | 2.50 | c | |||||||||||
2011 | 0.17 | 0.21 | 0.95 | 2.16 | 0.86 | 1.64 | 1.46 | 0.36 | 0.08 | 0.38 | 0.11 | 0.18 | 2.16 | |||||||||||||
2012 | 0.18 | 1.28 | 0.38 | 0.39 | 2.88 | 0.86 | 0.63 | 1.14 | 0.43 | 0.55 | 0.40 | 0.88 | 2.88 | |||||||||||||
2013 | 0.15 | 0.26 | 0.45 | 0.66 | 0.87 | 1.60 | 1.00 | 1.34 | 1.22 | 1.35 | 0.61 | 0.40 | 1.60 | |||||||||||||
2014 | 0.13 | a | 0.26 | 0.43 | 0.63 | 0.72 | 3.71 | 0.54 | 2.41 | 0.25 | 1.31 | 0.27 | 0.65 | 3.71 | a | |||||||||||
2015 | 0.16 | 0.12 | 0.39 | 0.28 | 2.48 | 1.35 | 1.38 | 1.42 | 1.35 | 0.49 | 1.00 | 0.26 | 2.48 | |||||||||||||
2016 | 0.24 | 0.13 | 0.74 | 0.88 | 0.89 | 1.40 | 2.16 | 2.89 | 1.05 | 0.84 | 0.74 | 0.59 | 2.89 | |||||||||||||
2017 | 0.26 | 0.26 | 0.23 | 0.78 | 1.41 | 0.55 | 1.05 | 3.98 | 0.51 | 2.76 | a | 0.16 | 0.21 | 3.98 | a | |||||||||||
2018 | 0.10 | 0.21 | 0.56 | 0.32 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 0.32 | 0.39 | 0.67 | 0.98 | 1.07 | 1.44 | 1.41 | 1.49 | 1.05 | 0.91 | 0.61 | 0.38 | 2.40 | |||||||||||||
S.D. | 0.35 | 0.30 | 0.41 | 0.60 | 0.58 | 0.88 | 0.74 | 1.08 | 0.71 | 0.85 | 0.51 | 0.29 | 0.88 | |||||||||||||
SKEW | 2.91 | 1.04 | 0.97 | 1.29 | 1.15 | 1.63 | 1.07 | 2.05 | 1.18 | 3.35 | 1.35 | 1.29 | 1.52 | |||||||||||||
MAX | 2.01 | 1.28 | 2.02 | 3.08 | 2.90 | 4.80 | 3.63 | 6.80 | 3.19 | 6.13 | 2.38 | 1.44 | 6.13 | |||||||||||||
MIN | 0.00 | 0.01 | 0.09 | 0.22 | 0.22 | 0.29 | 0.26 | 0.15 | 0.08 | 0.00 | 0.03 | 0.00 | 1.13 | |||||||||||||
YRS | 68 | 71 | 72 | 73 | 74 | 75 | 76 | 76 | 75 | 75 | 73 | 70 | 58 |