YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.29 | 0.83 | 0.33 | 0.60 | 0.09 | 0.07 | ----- | z | ||||||
1940 | 0.34 | 0.33 | 0.90 | 0.15 | 0.43 | 0.24 | 1.07 | 0.36 | 0.54 | 0.26 | 0.25 | 0.21 | 1.07 | |||||||||||||
1941 | 0.47 | 0.10 | 1.01 | 0.32 | 0.53 | 0.38 | 0.20 | 0.38 | 1.21 | 0.32 | 0.18 | 0.60 | 1.21 | |||||||||||||
1942 | 0.13 | 0.56 | 0.79 | 0.73 | 0.41 | 0.70 | 0.62 | 0.36 | 0.15 | 0.45 | 0.34 | 0.17 | 0.79 | |||||||||||||
1943 | 0.66 | 0.35 | 0.64 | 0.24 | 0.95 | 1.30 | 0.10 | 0.50 | 0.09 | 0.25 | 0.15 | 0.13 | 1.30 | |||||||||||||
1944 | 0.30 | 0.18 | 0.30 | 1.20 | 0.60 | 0.25 | 0.15 | 0.25 | 0.22 | 0.44 | 0.40 | 0.20 | 1.20 | |||||||||||||
1945 | 0.30 | 0.35 | 0.25 | 0.95 | 0.85 | 0.35 | 0.45 | 0.80 | 0.75 | 0.65 | 0.85 | b | 0.35 | 0.95 | b | |||||||||||
1946 | 0.30 | 0.55 | 0.35 | b | 0.45 | 0.75 | 0.95 | 0.80 | 0.40 | 0.65 | a | 0.35 | 0.85 | 0.15 | a | 0.95 | d | |||||||||
1947 | 0.25 | 0.45 | 0.55 | a | 0.65 | 0.25 | a | 1.15 | b | 0.65 | 0.50 | 0.85 | 0.95 | 0.25 | 0.30 | 1.15 | d | |||||||||
1948 | 0.70 | 0.32 | 0.28 | 0.52 | 0.34 | 0.22 | 0.16 | 0.19 | 0.15 | 0.13 | 0.50 | 0.85 | 0.85 | |||||||||||||
1949 | 0.21 | 0.21 | 0.51 | 0.24 | 0.30 | 0.66 | 0.40 | 0.20 | 0.22 | 0.52 | 0.10 | 0.11 | 0.66 | |||||||||||||
1950 | 1.07 | 0.33 | 0.27 | 0.69 | 0.58 | 0.49 | 0.16 | 0.25 | 0.25 | 0.21 | 0.35 | 0.37 | 1.07 | |||||||||||||
1951 | 1.11 | 0.35 | r | 0.22 | 0.40 | 0.40 | a | 0.49 | 0.83 | 0.66 | 0.48 | 0.41 | 0.40 | 1.18 | 1.18 | s | ||||||||||
1952 | 0.39 | 0.10 | 0.47 | 0.20 | 0.35 | 0.21 | 1.30 | 0.38 | 0.37 | 0.03 | 0.43 | 0.14 | 1.30 | |||||||||||||
1953 | 0.10 | 0.23 | 0.27 | 0.67 | 0.68 | 0.22 | 0.41 | 0.40 | 0.10 | 0.55 | 0.43 | 0.31 | 0.68 | |||||||||||||
1954 | 0.35 | 0.30 | 0.47 | 0.16 | 0.69 | 0.24 | 0.62 | 0.22 | 0.53 | 0.42 | 0.65 | 0.35 | 0.69 | |||||||||||||
1955 | 0.15 | 0.31 | 0.38 | 0.13 | 0.36 | 0.26 | 0.46 | 0.66 | 0.27 | 0.30 | 0.61 | 0.10 | 0.66 | |||||||||||||
1956 | 0.35 | 0.44 | 0.29 | 0.42 | 0.82 | 0.04 | 0.49 | 0.60 | 0.04 | 0.24 | 0.20 | 0.63 | 0.82 | |||||||||||||
1957 | 0.60 | 0.60 | 0.40 | 1.08 | 1.15 | 0.63 | 0.67 | 0.28 | 0.40 | 0.21 | 0.30 | 0.14 | 1.15 | |||||||||||||
1958 | 0.06 | 0.14 | 0.51 | 0.60 | 0.20 | 0.29 | 0.53 | 0.22 | 0.23 | 0.30 | 0.50 | 0.38 | 0.60 | |||||||||||||
1959 | 0.31 | 0.17 | 0.25 | 0.40 | 0.69 | 1.00 | 0.54 | 0.40 | 1.50 | 0.67 | 0.40 | 0.30 | 1.50 | |||||||||||||
1960 | 0.09 | 0.41 | 0.37 | 0.37 | 1.31 | 0.20 | 0.22 | 0.56 | 0.17 | 0.29 | 0.25 | 0.41 | 1.31 | |||||||||||||
1961 | 0.08 | 0.40 | 0.39 | 0.54 | 0.63 | 0.08 | 0.43 | 0.40 | 0.94 | 0.15 | 0.30 | 0.17 | 0.94 | |||||||||||||
1962 | 0.70 | 0.32 | f | 0.12 | 0.59 | 0.63 | 0.71 | 0.17 | 0.21 | 0.26 | 0.18 | 0.12 | 0.26 | 0.71 | f | |||||||||||
1963 | 0.45 | 0.28 | 0.40 | 0.05 | 0.17 | 1.40 | c | 0.29 | b | 1.15 | b | 0.45 | 0.35 | 0.28 | 0.16 | 1.40 | g | |||||||||
1964 | 0.38 | 0.23 | 0.41 | 0.18 | 0.12 | 0.30 | 0.68 | 0.41 | 0.34 | 0.17 | 0.52 | 0.70 | 0.70 | |||||||||||||
1965 | 0.25 | 0.19 | 0.50 | 0.29 | 0.51 | 0.35 | 0.66 | 0.77 | 0.54 | 0.07 | 0.47 | 0.34 | 0.77 | |||||||||||||
1966 | 0.12 | 0.20 | 0.27 | 0.32 | 0.28 | 0.15 | 0.18 | 0.46 | 0.55 | 0.77 | 0.40 | 1.20 | 1.20 | |||||||||||||
1967 | 0.23 | 0.40 | 0.34 | 0.21 | 0.25 | 0.53 | 0.29 | 0.60 | 0.64 | 0.54 | 0.35 | 0.35 | 0.64 | |||||||||||||
1968 | 0.10 | 0.43 | 0.18 | 0.36 | 0.40 | 0.12 | 0.18 | 0.32 | 0.46 | 0.63 | 0.28 | 0.23 | 0.63 | |||||||||||||
1969 | 0.33 | 0.26 | 0.17 | 0.54 | 0.41 | 0.82 | 0.44 | 0.30 | 0.72 | 1.12 | 0.43 | 0.48 | 1.12 | |||||||||||||
1970 | 0.20 | 0.13 | 0.48 | 0.45 | 0.13 | 1.03 | 0.54 | 0.53 | 0.63 | 1.50 | 0.83 | 0.22 | 1.50 | |||||||||||||
1971 | 0.25 | 0.20 | 0.34 | 0.34 | 0.31 | 0.20 | 0.27 | 0.35 | 0.53 | 0.18 | 0.32 | 0.60 | 0.60 | |||||||||||||
1972 | 0.44 | 0.45 | 0.15 | 0.50 | 0.58 | 0.34 | 0.14 | 0.42 | 0.28 | 0.24 | 0.39 | 0.45 | 0.58 | |||||||||||||
1973 | 0.22 | 0.14 | 0.39 | 0.35 | 0.53 | 0.54 | 0.68 | 0.43 | 0.13 | 0.58 | 0.77 | 0.50 | 0.77 | |||||||||||||
1974 | 0.29 | 0.18 | 0.50 | 0.26 | 0.16 | 0.57 | 0.48 | 0.22 | 0.41 | 0.40 | 0.15 | 0.10 | 0.57 | |||||||||||||
1975 | 0.30 | 0.20 | 0.35 | 0.65 | 0.21 | 0.30 | 0.24 | 0.42 | 0.25 | 1.20 | 0.40 | 0.10 | 1.20 | |||||||||||||
1976 | 0.30 | 0.42 | 0.54 | 0.19 | 0.82 | 0.34 | 0.36 | 0.96 | 0.23 | 0.20 | 0.40 | 0.05 | 0.96 | |||||||||||||
1977 | 0.18 | 0.11 | 0.36 | 0.45 | 0.36 | 0.23 | 0.52 | 0.65 | 0.54 | 0.31 | 0.32 | 0.52 | 0.65 | |||||||||||||
1978 | 0.19 | 0.36 | 0.80 | 0.24 | 0.54 | 0.23 | 0.28 | 0.29 | 0.42 | 0.45 | 0.26 | 0.60 | 0.80 | |||||||||||||
1979 | 0.23 | 0.34 | 0.76 | 0.55 | 0.76 | 1.13 | 0.15 | 0.78 | 0.02 | 0.48 | 0.35 | 0.24 | 1.13 | |||||||||||||
1980 | 0.86 | 0.59 | 0.34 | 0.17 | 0.64 | 0.01 | 0.78 | 0.52 | 0.85 | 0.19 | 0.40 | 0.60 | 0.86 | |||||||||||||
1981 | 0.05 | 0.20 | 0.75 | 0.80 | 0.86 | 0.20 | 0.55 | 0.18 | 0.51 | 0.64 | 0.19 | 0.61 | 0.86 | |||||||||||||
1982 | 0.53 | 0.10 | 0.23 | 0.29 | a | 0.88 | 0.23 | 0.95 | 0.30 | 0.88 | 0.23 | 0.21 | 0.45 | 0.95 | a | |||||||||||
1983 | 0.18 | 0.09 | 0.49 | 0.33 | 0.75 | 1.05 | 0.89 | 0.53 | 0.32 | 0.37 | 0.48 | 0.83 | 1.05 | |||||||||||||
1984 | 0.23 | 0.16 | 0.39 | 0.60 | 0.39 | 1.30 | 1.04 | 0.77 | 0.49 | 0.55 | 0.14 | 0.21 | 1.30 | |||||||||||||
1985 | 0.34 | 0.40 | 0.52 | 0.63 | 0.77 | 0.44 | 1.00 | 0.24 | ----- | z | 1.30 | 1.55 | 0.11 | ----- | z | |||||||||||
1986 | 0.11 | 1.22 | 0.14 | 1.05 | 0.44 | 0.55 | ----- | z | ----- | z | 0.62 | 0.35 | 0.35 | 0.20 | ----- | z | ||||||||||
1987 | 0.25 | 0.50 | 0.33 | 0.60 | 0.45 | 0.15 | 0.56 | 0.24 | 0.35 | 0.32 | 0.36 | ----- | z | ----- | z | |||||||||||
1988 | 0.35 | 0.15 | 0.40 | 0.30 | 0.93 | 0.36 | 0.43 | 0.28 | 0.32 | 0.19 | 0.35 | 0.39 | 0.93 | |||||||||||||
1989 | 0.29 | 0.74 | 0.25 | 0.39 | 0.28 | 0.20 | 0.26 | 0.38 | 0.28 | 0.96 | 0.51 | 0.25 | 0.96 | |||||||||||||
1990 | 0.00 | 0.34 | 0.37 | 0.45 | 0.50 | 0.32 | 0.64 | 0.38 | 0.21 | 0.98 | 0.42 | 0.24 | 0.98 | |||||||||||||
1991 | 0.40 | 0.04 | 0.15 | 0.29 | 0.60 | 0.63 | 0.51 | 0.63 | 0.55 | 0.20 | 0.09 | 0.29 | 0.63 | |||||||||||||
1992 | 0.13 | a | 0.13 | 0.58 | 0.70 | 0.51 | 0.42 | 0.46 | 0.26 | 0.47 | 0.17 | 0.55 | 0.36 | a | 0.70 | b | ||||||||||
1993 | 0.18 | 0.31 | a | 0.73 | 0.42 | 0.50 | d | 0.60 | 0.60 | 0.35 | 0.52 | 0.82 | 0.25 | p | 0.20 | 0.82 | u | |||||||||
1994 | 0.27 | 0.24 | 0.36 | 0.45 | 0.47 | 0.41 | 0.46 | c | 0.46 | 0.45 | 0.31 | 0.26 | 0.19 | 0.47 | c | |||||||||||
1995 | 0.17 | b | ----- | z | 0.98 | f | 0.87 | 0.68 | c | 0.32 | 1.52 | f | 0.40 | d | 0.61 | 0.42 | 0.55 | 0.55 | ----- | z | ||||||
1996 | 0.69 | b | 1.29 | 0.26 | 0.53 | b | 0.55 | 0.44 | 0.44 | 0.02 | 0.95 | a | 0.50 | 0.60 | b | 0.40 | 1.29 | g | ||||||||
1997 | 0.65 | 0.60 | 0.38 | 0.82 | 0.60 | 0.30 | 0.23 | 0.79 | 1.36 | 0.65 | c | 0.30 | 0.21 | 1.36 | c | |||||||||||
1998 | 0.53 | 0.25 | 0.21 | 0.35 | 0.04 | a | 0.29 | l | 1.46 | o | 0.40 | n | ----- | z | 1.00 | 0.55 | a | 1.05 | ----- | z | ||||||
1999 | 0.20 | 0.21 | 0.35 | 0.40 | b | 0.46 | 0.84 | 0.20 | 0.51 | 0.23 | 0.23 | 0.31 | n | 0.30 | i | 0.84 | y | |||||||||
2000 | 0.19 | b | 0.40 | 0.45 | 1.60 | 0.70 | 0.85 | 0.20 | 2.50 | 1.11 | 0.34 | 0.16 | a | 0.60 | 2.50 | c | ||||||||||
2001 | 0.16 | 0.12 | a | 0.25 | 1.13 | 0.51 | 0.46 | 0.33 | 0.25 | 0.80 | 0.35 | 0.50 | 0.19 | 1.13 | a | |||||||||||
2002 | 0.41 | 0.31 | 0.50 | a | 0.48 | 0.48 | d | 0.09 | 0.30 | e | 1.03 | i | 0.71 | m | 0.63 | t | 1.19 | p | 0.06 | f | ----- | z | ||||
2003 | 0.06 | k | 0.48 | j | 1.05 | q | 0.48 | k | 0.59 | i | 0.34 | i | 0.27 | b | 1.24 | m | 0.60 | m | 0.31 | n | 0.75 | h | 0.24 | j | ----- | z |
2004 | 0.86 | k | 0.32 | o | 0.22 | j | 0.64 | l | 0.27 | o | 0.71 | m | 0.24 | 0.78 | r | 0.70 | j | 0.59 | 1.14 | n | 0.08 | j | ----- | z | ||
2005 | 0.59 | e | 0.48 | p | 0.08 | o | 0.65 | o | 0.42 | q | 0.53 | w | 0.55 | h | 0.36 | p | 1.15 | t | 1.56 | t | 0.33 | q | 0.62 | r | ----- | z |
2006 | 0.77 | r | 0.34 | n | 0.54 | q | 0.19 | o | 0.38 | l | 0.28 | q | 1.23 | y | 0.46 | k | 0.85 | l | 0.48 | o | 0.36 | o | 0.43 | q | ----- | z |
2007 | 0.77 | p | 0.24 | n | 0.34 | o | 0.66 | m | 0.57 | o | 0.39 | m | 0.48 | x | ----- | z | 0.78 | 0.69 | f | 0.29 | q | 0.56 | p | ----- | z | |
2008 | 0.80 | n | 0.17 | m | 0.69 | n | 0.55 | l | 1.10 | o | 0.50 | m | 0.34 | o | 0.75 | q | 1.17 | m | 0.15 | q | 0.23 | r | 0.52 | q | ----- | z |
2009 | 0.27 | l | 0.07 | m | 0.63 | i | 0.75 | n | 0.49 | s | 0.85 | p | 0.25 | u | 0.62 | v | 0.24 | q | 0.31 | v | 0.10 | q | 0.28 | s | ----- | z |
2010 | 0.11 | q | 0.55 | p | 0.28 | p | 0.80 | l | 0.85 | r | 1.16 | m | 0.35 | m | 0.54 | p | 0.33 | o | 0.64 | r | 0.43 | n | 0.40 | r | ----- | z |
2011 | 0.15 | n | 0.41 | n | 0.77 | n | 0.98 | k | 0.70 | o | 0.75 | o | 0.44 | o | 0.19 | i | 0.93 | n | 0.93 | q | 0.55 | m | 0.19 | r | ----- | z |
2012 | 0.22 | n | 0.28 | p | 0.08 | k | 0.15 | l | 0.08 | t | 0.94 | p | 0.97 | p | 0.20 | u | 0.39 | x | 0.71 | t | 0.22 | r | 0.33 | x | ----- | z |
2013 | 0.27 | w | 0.40 | n | 0.24 | u | 1.10 | p | 0.72 | t | 0.03 | t | 1.02 | p | 0.16 | s | 1.70 | s | 0.49 | s | 0.24 | n | 0.76 | s | ----- | z |
2014 | 0.34 | t | 1.36 | q | 0.15 | m | 0.91 | j | 1.53 | v | 0.10 | x | 0.59 | m | 0.27 | s | 0.82 | s | 0.62 | p | 0.34 | u | 0.28 | y | ----- | z |
2015 | 1.32 | u | 0.44 | m | 0.20 | m | 0.25 | i | 1.69 | q | 0.25 | s | 0.60 | o | 0.31 | r | 0.90 | w | 0.70 | w | 0.32 | t | 0.33 | t | ----- | z |
2016 | 0.46 | v | 0.70 | t | 0.36 | k | 1.51 | m | 1.23 | s | 0.41 | w | 0.84 | v | 0.91 | q | 0.13 | x | 0.30 | r | ----- | z | 0.65 | t | ----- | z |
2017 | 0.90 | v | 0.33 | p | 0.21 | m | 0.46 | m | 1.15 | t | 0.32 | n | 0.39 | q | 0.57 | q | 0.29 | r | 1.89 | u | 0.32 | r | 0.27 | u | ----- | z |
2018 | 0.43 | r | 0.73 | r | 0.39 | r | 0.07 | x | ----- | z | ----- | z | ----- | z | ----- | z | 0.20 | q | 0.17 | y | ----- | z | 0.21 | t | ----- | z |
2019 | 0.11 | y | ----- | z | 0.65 | p | 1.35 | q | 0.74 | n | 1.04 | t | 0.10 | r | 0.44 | n | 0.68 | t | ----- | z | 0.42 | y | 0.44 | u | ----- | z |
2020 | 0.34 | v | 1.38 | x | 0.31 | x | 0.50 | j | 0.50 | u | 0.61 | r | 0.33 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 0.33 | 0.33 | 0.41 | 0.50 | 0.53 | 0.48 | 0.47 | 0.48 | 0.49 | 0.46 | 0.40 | 0.37 | 0.97 | |||||||||||||
S.D. | 0.23 | 0.23 | 0.19 | 0.29 | 0.25 | 0.34 | 0.27 | 0.34 | 0.31 | 0.31 | 0.23 | 0.26 | 0.34 | |||||||||||||
SKEW | 1.43 | 2.21 | 1.04 | 1.35 | 0.54 | 1.04 | 0.91 | 3.68 | 1.08 | 1.32 | 2.16 | 1.39 | 1.77 | |||||||||||||
MAX | 1.11 | 1.29 | 1.01 | 1.60 | 1.31 | 1.40 | 1.30 | 2.50 | 1.50 | 1.50 | 1.55 | 1.20 | 2.50 | |||||||||||||
MIN | 0.00 | 0.04 | 0.12 | 0.05 | 0.04 | 0.01 | 0.10 | 0.02 | 0.02 | 0.03 | 0.09 | 0.05 | 0.47 | |||||||||||||
YRS | 64 | 60 | 62 | 63 | 63 | 62 | 63 | 61 | 62 | 64 | 61 | 61 | 51 |