YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1931 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.13 | 0.30 | 0.28 | 0.35 | ----- | z | ||||
1932 | 0.30 | 0.05 | a | 0.65 | 0.50 | 0.80 | 0.55 | 0.50 | 0.00 | 0.00 | 0.38 | 0.30 | 0.35 | 0.80 | a | |||||||||||
1933 | 0.45 | 0.75 | 0.45 | 0.48 | 0.35 | 0.10 | 0.00 | 0.15 | 0.60 | ----- | z | 1.00 | 0.40 | ----- | z | |||||||||||
1934 | 0.75 | 0.40 | 0.25 | 0.42 | 0.20 | 0.65 | 0.20 | ----- | z | 0.35 | 0.55 | 0.38 | 0.45 | ----- | z | |||||||||||
1935 | 1.70 | a | 0.31 | 0.50 | a | 0.40 | 1.20 | ----- | z | ----- | z | ----- | z | ----- | z | 0.10 | 0.30 | 0.40 | ----- | z | ||||||
1936 | 0.45 | 0.40 | 0.50 | 0.48 | 0.16 | 0.76 | ----- | z | 0.14 | ----- | z | ----- | z | 0.00 | 0.64 | ----- | z | |||||||||
1937 | 0.35 | 0.37 | 0.43 | ----- | z | ----- | z | 0.20 | 0.41 | 0.00 | 0.15 | 0.52 | 0.90 | 0.92 | ----- | z | ||||||||||
1938 | 0.50 | 0.25 | 0.55 | 0.85 | ----- | z | ----- | z | 0.60 | 0.17 | 0.23 | ----- | z | ----- | z | ----- | z | ----- | z | |||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1940 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1941 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1942 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1943 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1944 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1945 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1946 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | 0.28 | b | 0.33 | 0.17 | 0.30 | 0.06 | 0.60 | 0.17 | 0.00 | 0.35 | 0.13 | d | ----- | z | ||||||||
1953 | 0.37 | c | 0.60 | 0.50 | b | 0.25 | 1.20 | a | 0.65 | 0.00 | 0.03 | 0.00 | ----- | z | 0.33 | 0.45 | ----- | z | ||||||||
1954 | 0.25 | f | ----- | z | 0.26 | 0.02 | 0.10 | 0.30 | 0.00 | 0.04 | 0.00 | 0.50 | 0.05 | ----- | z | ----- | z | |||||||||
1955 | ----- | z | ----- | z | 0.25 | 0.60 | 0.70 | a | 0.80 | 0.10 | 0.00 | 0.25 | 0.40 | 0.60 | 1.90 | ----- | z | |||||||||
1956 | 1.10 | a | 0.22 | 0.25 | 0.84 | 0.55 | 0.10 | 0.21 | a | 0.00 | 0.00 | 0.44 | 0.05 | 0.58 | 1.10 | b | ||||||||||
1957 | 0.45 | 0.32 | 0.80 | 0.32 | 0.60 | 0.45 | 0.05 | 0.07 | 0.15 | a | 0.53 | 0.40 | 0.30 | 0.80 | a | |||||||||||
1958 | 0.28 | a | 0.57 | 0.29 | 0.31 | 0.45 | 0.62 | 0.23 | 0.07 | 0.08 | 0.00 | 0.30 | 0.43 | 0.62 | a | |||||||||||
1959 | 0.25 | 0.13 | 0.83 | 0.08 | 0.30 | 0.22 | 0.04 | 0.20 | 0.94 | 0.27 | 0.15 | 0.44 | 0.94 | |||||||||||||
1960 | 0.50 | 0.66 | 0.50 | 0.19 | 0.38 | 0.00 | 0.70 | 0.23 | 0.00 | 0.13 | 0.65 | 0.32 | 0.70 | |||||||||||||
1961 | 0.80 | 0.29 | c | 0.74 | 0.00 | 0.12 | 0.05 | 0.38 | 0.09 | 0.47 | 0.59 | 0.12 | 0.22 | a | 0.80 | d | ||||||||||
1962 | 0.21 | 0.44 | 0.33 | 0.46 | 0.55 | a | 0.10 | 0.17 | 0.00 | 0.09 | 0.72 | 0.47 | 0.32 | 0.72 | a | |||||||||||
1963 | 0.90 | 0.55 | 0.15 | 0.66 | 0.51 | 0.47 | 0.00 | 0.24 | 0.23 | 0.48 | 0.42 | 0.50 | 0.90 | |||||||||||||
1964 | 0.46 | 0.10 | 0.15 | b | 0.51 | 0.69 | 0.73 | 0.04 | 0.28 | 0.00 | 0.14 | 0.42 | 0.70 | 0.73 | b | |||||||||||
1965 | 0.72 | 0.03 | 0.03 | ----- | z | 0.40 | 0.20 | 0.10 | 0.25 | 0.10 | 0.00 | 0.55 | a | 0.15 | b | ----- | z | |||||||||
1966 | 0.10 | 0.25 | 0.04 | 0.00 | 0.31 | 0.25 | 0.00 | 0.00 | 0.05 | 0.25 | 0.75 | 0.32 | 0.75 | |||||||||||||
1967 | 1.12 | 0.30 | 0.25 | 0.71 | 0.40 | 0.90 | 0.08 | 0.00 | 0.43 | 0.16 | 0.62 | 0.27 | 1.12 | |||||||||||||
1968 | 0.26 | a | 0.29 | 0.23 | 0.35 | 0.47 | 0.15 | 0.02 | 1.19 | 0.00 | 0.30 | 0.50 | 0.44 | 1.19 | a | |||||||||||
1969 | 0.89 | 0.05 | a | 0.12 | 0.49 | 0.32 | 0.65 | 0.00 | 0.00 | 0.15 | 0.38 | 0.27 | 0.39 | 0.89 | a | |||||||||||
1970 | 0.65 | 0.00 | 0.54 | 0.75 | 0.38 | 0.30 | 0.60 | 0.00 | 0.55 | 0.31 | 0.58 | 0.38 | 0.75 | |||||||||||||
1971 | 0.67 | c | 0.40 | 0.65 | c | 0.20 | 0.20 | 0.92 | 0.00 | 0.00 | 0.95 | a | 0.36 | 0.70 | 0.35 | 0.95 | g | |||||||||
1972 | 0.43 | 0.50 | 0.92 | 0.27 | 0.80 | 1.57 | 0.00 | 0.00 | 0.54 | 0.25 | 0.34 | 0.50 | 1.57 | |||||||||||||
1973 | 0.33 | 0.13 | 0.35 | 1.54 | 0.11 | 0.60 | 0.20 | 0.10 | 0.59 | 0.49 | 0.49 | 0.46 | 1.54 | |||||||||||||
1974 | 0.25 | 0.25 | 0.73 | 0.40 | 0.00 | n | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.52 | ----- | z | ----- | z | |||||
1975 | ----- | z | ----- | z | ----- | z | ----- | z | 0.25 | 0.89 | 0.59 | 0.18 | 0.10 | 1.30 | 0.25 | 0.45 | ----- | z | ||||||||
1976 | 0.50 | 0.38 | 0.32 | 0.34 | 0.17 | 0.69 | 0.52 | 0.42 | 0.38 | 0.58 | 0.16 | 0.10 | 0.69 | |||||||||||||
1977 | 0.66 | 0.18 | 0.31 | 0.41 | 0.38 | 0.38 | 0.45 | 0.91 | 0.47 | 0.11 | 0.70 | 0.62 | 0.91 | |||||||||||||
1978 | 0.75 | 0.50 | 0.41 | 1.06 | 0.20 | 0.54 | b | 0.38 | 0.39 | 0.39 | 0.00 | 0.81 | 0.32 | 1.06 | b | |||||||||||
1979 | ----- | z | 0.31 | 0.60 | 0.62 | 0.35 | 0.62 | 0.05 | 0.90 | 0.00 | 1.02 | 0.45 | 0.20 | ----- | z | |||||||||||
1980 | 0.50 | 0.58 | ----- | z | 0.34 | 0.52 | 0.63 | 0.13 | 0.00 | 0.45 | 0.63 | 0.40 | 0.61 | a | ----- | z | ||||||||||
1981 | 0.57 | 0.41 | 1.12 | 1.60 | 0.49 | 0.55 | 0.24 | 0.18 | 0.19 | 0.90 | 1.02 | a | 1.75 | c | 1.75 | d | ||||||||||
1982 | 1.00 | a | 0.37 | 0.30 | a | 0.37 | b | 0.16 | w | 1.05 | 0.95 | 0.11 | 0.76 | e | 1.19 | 0.76 | d | 2.16 | ----- | z | ||||||
1983 | 1.30 | b | 0.62 | f | 0.63 | d | 1.05 | d | 1.02 | 0.90 | 0.60 | 0.98 | 0.35 | 0.32 | 0.48 | a | 0.76 | a | 1.30 | r | ||||||
1984 | 0.24 | 0.65 | 0.54 | b | 0.53 | 0.70 | 0.48 | 0.66 | 0.25 | 0.20 | 0.50 | ----- | z | 0.18 | ----- | z | ||||||||||
1985 | 0.10 | 0.23 | 0.28 | a | 0.28 | 0.45 | 0.21 | 1.02 | a | 0.04 | 0.40 | c | 0.50 | 0.53 | d | 0.60 | 1.02 | i | ||||||||
1986 | 0.53 | 1.73 | a | 0.95 | 0.48 | a | 0.68 | a | 0.02 | 0.00 | 0.15 | 1.21 | f | 0.11 | a | ----- | z | ----- | z | ----- | z | |||||
1987 | 0.40 | a | 0.63 | 0.52 | 0.25 | a | 1.38 | a | 0.37 | j | 0.30 | ----- | z | ----- | z | 0.03 | 0.34 | a | 0.36 | c | ----- | z | ||||
1988 | 0.30 | 0.06 | 0.31 | 0.65 | 0.29 | 0.60 | b | 0.05 | 0.00 | 0.25 | 0.00 | 0.68 | a | 0.48 | b | 0.68 | e | |||||||||
1989 | 0.50 | 0.63 | 1.17 | a | 0.42 | a | 0.32 | 0.00 | 0.00 | 0.36 | a | 0.65 | 0.37 | g | 0.45 | 0.00 | 1.17 | j | ||||||||
1990 | 0.29 | 0.42 | 0.08 | a | 0.83 | a | 0.75 | 0.35 | a | ----- | z | 0.73 | 0.12 | 0.28 | 0.50 | 0.28 | ----- | z | ||||||||
1991 | 0.23 | 0.39 | 0.52 | 0.46 | 1.31 | a | 0.97 | 0.00 | 0.28 | a | 0.28 | 0.89 | 0.38 | 0.49 | 1.31 | b | ||||||||||
1992 | 0.24 | b | 0.31 | 0.25 | 0.28 | 0.22 | 1.23 | 0.10 | 0.00 | ----- | z | 0.54 | a | 0.26 | c | 0.53 | ----- | z | ||||||||
1993 | 0.40 | 0.30 | b | 2.00 | b | 0.57 | 0.25 | c | 0.86 | 0.55 | 0.26 | 0.00 | 0.50 | 0.16 | b | 0.36 | 2.00 | i | ||||||||
1994 | 0.33 | 0.53 | b | 0.20 | 0.28 | 0.25 | 0.35 | 0.00 | 0.00 | 0.05 | a | 0.50 | c | 0.45 | b | 0.52 | 0.53 | h | ||||||||
1995 | 0.81 | a | 0.05 | m | 0.82 | 0.45 | 0.52 | 0.50 | 0.75 | 0.17 | 0.11 | a | 0.45 | f | 0.81 | a | 1.07 | c | 1.07 | y | ||||||
1996 | 0.48 | d | 0.67 | 0.64 | 0.55 | 0.68 | 0.39 | 0.00 | 0.28 | 0.10 | 0.31 | 0.67 | 1.70 | a | 1.70 | e | ||||||||||
1997 | 0.80 | 0.15 | 0.20 | 0.58 | 0.71 | 0.66 | b | 0.19 | 0.25 | b | 0.15 | 0.25 | 0.30 | 0.35 | d | 0.80 | h | |||||||||
1998 | 0.40 | 0.39 | 0.42 | 0.40 | 1.47 | 1.06 | 0.30 | 0.00 | 0.81 | d | 0.12 | 0.52 | c | 0.52 | a | 1.47 | h | |||||||||
1999 | 1.74 | j | 0.52 | b | 0.30 | 0.18 | 0.38 | 0.16 | b | 0.00 | 0.16 | 0.00 | 0.23 | 0.27 | a | 0.47 | d | 1.74 | s | |||||||
2000 | 0.58 | b | 0.48 | a | 1.00 | 0.43 | 0.45 | 0.54 | 0.00 | 0.37 | 0.49 | d | 1.24 | 0.30 | 0.28 | a | 1.24 | h | ||||||||
2001 | ----- | z | 0.15 | a | 0.54 | b | 0.34 | a | 0.50 | e | 0.12 | a | 0.52 | a | 0.00 | 0.00 | 0.24 | a | 0.70 | g | 0.50 | k | ----- | z | ||
2002 | 0.61 | d | 0.36 | a | 0.45 | a | 0.60 | g | 0.34 | b | 0.25 | 0.30 | a | 0.00 | 0.22 | a | 0.20 | 0.44 | 1.40 | k | ----- | z | ||||
2003 | 0.61 | a | 0.20 | a | 0.60 | 1.10 | 1.27 | 0.07 | 0.10 | 0.47 | a | 0.00 | 0.00 | ----- | z | ----- | z | ----- | z | |||||||
2004 | ----- | z | 0.45 | n | 0.40 | a | 0.35 | 0.97 | d | 0.17 | c | 0.14 | 0.85 | a | 0.40 | ----- | z | ----- | z | ----- | z | ----- | z | |||
2005 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2006 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2007 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2008 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2009 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2010 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2011 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2012 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2013 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2014 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2015 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2016 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2017 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2018 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
2019 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.27 | n | 0.60 | b | 0.39 | d | ----- | z |
2020 | 1.14 | e | 0.55 | a | 0.31 | f | 0.12 | k | 0.80 | c | 0.72 | f | ----- | z | ----- | z | ----- | z | 0.32 | x | ----- | z | ----- | z | ----- | z |
2021 | ----- | z | 0.84 | q | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 0.56 | 0.38 | 0.49 | 0.49 | 0.53 | 0.50 | 0.24 | 0.22 | 0.26 | 0.40 | 0.46 | 0.53 | 0.98 | |||||||||||||
S.D. | 0.32 | 0.26 | 0.33 | 0.32 | 0.34 | 0.34 | 0.27 | 0.29 | 0.25 | 0.32 | 0.23 | 0.43 | 0.32 | |||||||||||||
SKEW | 1.27 | 2.38 | 1.88 | 1.48 | 1.10 | 0.66 | 1.06 | 1.70 | 0.98 | 1.09 | 0.37 | 2.38 | 1.08 | |||||||||||||
MAX | 1.70 | 1.73 | 2.00 | 1.60 | 1.47 | 1.57 | 1.02 | 1.19 | 0.95 | 1.30 | 1.02 | 2.16 | 1.75 | |||||||||||||
MIN | 0.10 | 0.00 | 0.03 | 0.00 | 0.10 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.62 | |||||||||||||
YRS | 53 | 54 | 58 | 56 | 57 | 56 | 56 | 56 | 55 | 53 | 56 | 54 | 22 |