YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.48 | 1.11 | 1.09 | 1.13 | 0.12 | 0.20 | 4.13 | f | ||||||
1940 | 1.42 | 1.01 | 1.29 | 0.73 | 1.31 | 0.57 | 2.13 | 0.87 | 1.31 | 0.66 | 0.49 | 0.43 | 12.22 | |||||||||||||
1941 | 1.28 | 0.45 | 2.36 | 2.33 | 1.34 | 1.83 | 0.77 | 1.58 | 1.60 | 1.76 | 0.61 | 0.88 | 16.79 | |||||||||||||
1942 | 0.53 | 1.65 | 1.73 | 2.83 | 0.52 | 1.13 | 1.53 | 0.88 | 0.23 | 0.95 | 1.43 | 0.96 | 14.37 | |||||||||||||
1943 | 1.41 | 0.90 | 1.74 | 0.48 | 4.47 | 2.30 | 0.58 | 2.01 | 0.13 | 0.70 | 0.20 | 0.50 | 15.42 | |||||||||||||
1944 | 0.84 | 0.86 | 1.55 | 2.75 | 1.45 | 0.75 | 0.40 | 0.77 | 0.22 | 0.86 | 1.00 | 0.50 | 11.95 | |||||||||||||
1945 | 0.60 | 1.55 | 1.45 | 3.05 | 3.20 | 1.20 | 1.40 | 2.30 | 1.70 | 1.55 | 2.65 | b | 1.72 | 22.37 | ||||||||||||
1946 | 0.90 | 1.10 | 1.00 | b | 1.80 | 2.00 | 0.95 | 1.85 | 1.35 | 0.95 | a | 1.15 | 2.40 | 0.25 | a | 15.70 | ||||||||||
1947 | 0.90 | 1.40 | 2.45 | a | 2.70 | 1.15 | a | 2.90 | b | 1.65 | 1.50 | 1.40 | 2.50 | 0.75 | 0.85 | 20.15 | ||||||||||
1948 | 1.54 | 1.59 | 1.59 | 1.87 | 0.34 | 0.72 | 0.71 | 0.70 | 0.36 | 0.31 | 1.83 | 3.12 | 14.68 | |||||||||||||
1949 | 1.00 | 0.71 | 1.71 | 1.39 | 1.62 | 2.62 | 2.29 | 0.91 | 0.78 | 1.27 | 0.17 | 0.65 | 15.12 | |||||||||||||
1950 | 2.72 | 0.84 | 1.33 | 1.90 | 1.33 | 0.56 | 0.77 | 0.64 | 1.06 | 0.29 | 1.18 | 1.02 | 13.64 | |||||||||||||
1951 | 2.18 | 0.87 | r | 1.10 | 1.26 | 1.22 | a | 2.30 | 1.67 | 1.82 | 1.26 | 1.59 | 0.70 | 3.47 | 18.57 | a | ||||||||||
1952 | 1.36 | 0.62 | 1.67 | 0.86 | 1.54 | 0.26 | 2.07 | 2.79 | 0.53 | 0.03 | 1.97 | 0.40 | 14.10 | |||||||||||||
1953 | 0.59 | 0.52 | 0.86 | 2.18 | 2.12 | 0.35 | 1.81 | 1.32 | 0.17 | 1.05 | 0.95 | 0.77 | 12.69 | |||||||||||||
1954 | 0.66 | 0.55 | 1.61 | 0.51 | 1.78 | 0.88 | 2.39 | 1.03 | 2.44 | 1.11 | 1.15 | 0.70 | 14.81 | |||||||||||||
1955 | 0.39 | 1.02 | 1.22 | 0.42 | 1.62 | 0.73 | 0.86 | 2.25 | 0.52 | 0.85 | 2.27 | 0.37 | 12.52 | |||||||||||||
1956 | 1.78 | 1.68 | 0.87 | 1.94 | 1.37 | 0.10 | 1.66 | 1.23 | 0.06 | 0.70 | 0.77 | 1.14 | 13.30 | |||||||||||||
1957 | 2.87 | 1.04 | 1.19 | 3.03 | 2.64 | 2.08 | 2.24 | 1.57 | 0.87 | 1.27 | 0.66 | 0.80 | 20.26 | |||||||||||||
1958 | 0.24 | 0.46 | 1.78 | 2.05 | 0.54 | 0.83 | 1.56 | 0.87 | 1.19 | 0.43 | 0.98 | 0.92 | 11.85 | |||||||||||||
1959 | 1.41 | 1.05 | 1.48 | 1.85 | 2.08 | 1.85 | 1.44 | 2.47 | 3.59 | 2.11 | 0.59 | 0.45 | 20.37 | |||||||||||||
1960 | 0.31 | 1.41 | 1.71 | 1.26 | 2.19 | 0.43 | 0.75 | 1.57 | 1.00 | 0.87 | 0.99 | 0.61 | 13.10 | |||||||||||||
1961 | 0.18 | 1.14 | 1.78 | 2.47 | 2.13 | 0.33 | 2.26 | 1.93 | 5.95 | 0.58 | 0.75 | 0.94 | 20.44 | |||||||||||||
1962 | 2.48 | 1.31 | f | 0.41 | 1.63 | 2.14 | 0.96 | 0.79 | 0.77 | 0.41 | 0.53 | 0.20 | 0.82 | 11.14 | a | |||||||||||
1963 | 1.55 | 1.30 | 1.40 | 0.30 | 0.43 | 3.11 | c | 0.86 | b | 4.70 | b | 0.85 | 0.49 | 0.64 | 0.56 | 16.19 | ||||||||||
1964 | 1.07 | 1.00 | 2.16 | 1.08 | 0.41 | 1.19 | 1.71 | 1.54 | 0.87 | 0.33 | 1.43 | 2.01 | 14.80 | |||||||||||||
1965 | 1.55 | 0.69 | 2.62 | 0.80 | 1.20 | 0.94 | 2.27 | 2.23 | 2.51 | 0.12 | 1.70 | 1.01 | 17.64 | |||||||||||||
1966 | 0.29 | 0.60 | 0.47 | 1.13 | 1.11 | 0.66 | 0.76 | 1.16 | 1.04 | 1.50 | 0.70 | 1.88 | 11.30 | |||||||||||||
1967 | 0.93 | 1.84 | 1.27 | 0.64 | 1.20 | 2.25 | 0.95 | 1.60 | 2.00 | 1.17 | 0.75 | 1.55 | 16.15 | |||||||||||||
1968 | 0.30 | 1.29 | 0.68 | 1.27 | 1.75 | 0.32 | 0.64 | 1.96 | 1.04 | 0.88 | 1.36 | 0.92 | 12.41 | |||||||||||||
1969 | 1.79 | 0.71 | 0.50 | 1.08 | 1.18 | 4.66 | 0.92 | 1.22 | 1.58 | 3.48 | 0.81 | 1.45 | 19.38 | |||||||||||||
1970 | 0.85 | 0.42 | 1.58 | 1.78 | 0.35 | 1.36 | 1.21 | 1.60 | 2.49 | 2.80 | 1.93 | 1.23 | 17.60 | |||||||||||||
1971 | 0.68 | 1.20 | 1.49 | 1.40 | 1.33 | 0.44 | 0.97 | 1.07 | 1.81 | 0.52 | 1.18 | 2.07 | 14.16 | |||||||||||||
1972 | 1.09 | 1.07 | 1.03 | 1.73 | 1.00 | 1.74 | 0.52 | 1.63 | 1.83 | 1.39 | 1.08 | 1.18 | 15.29 | |||||||||||||
1973 | 0.94 | 0.45 | 1.25 | 1.70 | 2.29 | 1.96 | 3.15 | 1.24 | 0.39 | 0.59 | 1.71 | 1.56 | 17.23 | |||||||||||||
1974 | 1.45 | 0.60 | 2.39 | 1.20 | 0.36 | 1.68 | 2.78 | 0.37 | 0.97 | 0.99 | 0.60 | 0.50 | 13.89 | |||||||||||||
1975 | 1.36 | 1.06 | 2.05 | 1.52 | 0.68 | 0.93 | 0.97 | 1.14 | 0.75 | 1.56 | 1.19 | 0.24 | 13.45 | |||||||||||||
1976 | 1.08 | 1.27 | 1.67 | 0.91 | 2.98 | 1.04 | 1.28 | 2.09 | 1.67 | 0.54 | 0.76 | 0.12 | 15.41 | |||||||||||||
1977 | 0.40 | 0.48 | 1.30 | 1.21 | 1.13 | 0.72 | 1.46 | 2.43 | 1.20 | 1.40 | 1.06 | 1.35 | 14.14 | |||||||||||||
1978 | 0.95 | 1.00 | 1.45 | 1.73 | 1.52 | 0.67 | 0.72 | 0.70 | 0.83 | 0.94 | 0.45 | 2.48 | 13.44 | |||||||||||||
1979 | 1.14 | 0.90 | 1.49 | 1.34 | 2.82 | 2.55 | 0.57 | 2.12 | 0.07 | 0.69 | 1.28 | 0.69 | 15.66 | |||||||||||||
1980 | 2.84 | 1.55 | 1.29 | 0.65 | 1.49 | 0.01 | 1.49 | 1.73 | 1.82 | 0.54 | 0.61 | 0.75 | 14.77 | |||||||||||||
1981 | 0.10 | 0.35 | 2.05 | 1.25 | 3.58 | 0.49 | 1.59 | 0.42 | 1.04 | 1.23 | 0.38 | 2.02 | 14.50 | |||||||||||||
1982 | 2.24 | 0.40 | 0.64 | 1.03 | a | 2.90 | 0.43 | 1.48 | 1.11 | 1.95 | 0.74 | 0.73 | 0.87 | 14.52 | ||||||||||||
1983 | 0.40 | 0.49 | 2.34 | 1.05 | 2.87 | 2.84 | 2.80 | 1.16 | 0.85 | 0.80 | 2.77 | 2.57 | 20.94 | |||||||||||||
1984 | 0.45 | 0.60 | 2.05 | 1.76 | 1.21 | 2.71 | 3.79 | 3.37 | 1.69 | 2.60 | 0.61 | 0.60 | 21.44 | |||||||||||||
1985 | 1.08 | 1.19 | 1.95 | 1.73 | 0.94 | 0.95 | 2.90 | 0.59 | ----- | z | 2.51 | 2.70 | 0.52 | 17.06 | a | |||||||||||
1986 | 0.26 | 2.36 | 0.50 | 2.05 | 0.60 | 1.26 | ----- | z | ----- | z | 2.57 | 1.29 | 0.55 | 0.30 | 11.74 | b | ||||||||||
1987 | 0.45 | 0.92 | 0.81 | 0.62 | 1.62 | 0.46 | 1.64 | 0.74 | 0.56 | 1.15 | 0.78 | ----- | z | 9.75 | a | |||||||||||
1988 | 0.80 | 0.39 | 1.27 | 0.89 | 1.62 | 0.76 | 0.47 | 0.54 | 0.72 | 0.36 | 1.80 | 0.77 | 10.39 | |||||||||||||
1989 | 0.79 | 2.33 | 0.72 | 0.87 | 1.17 | 0.44 | 1.27 | 0.82 | 0.53 | 1.37 | 0.55 | 0.52 | 11.38 | |||||||||||||
1990 | 0.00 | 0.64 | 0.97 | 0.95 | 1.21 | 0.77 | 2.23 | 0.78 | 0.74 | 2.06 | 1.22 | 1.08 | 12.65 | |||||||||||||
1991 | 1.02 | 0.07 | 0.51 | 1.06 | 0.94 | 1.55 | 2.49 | 2.23 | 1.12 | 0.53 | 0.38 | 0.32 | 12.22 | |||||||||||||
1992 | 0.38 | a | 0.15 | 1.54 | 1.06 | 2.15 | 1.48 | 1.29 | 1.15 | 1.25 | 0.27 | 1.81 | 0.90 | a | 13.43 | |||||||||||
1993 | 0.75 | 1.44 | a | 1.21 | 1.78 | 1.79 | d | 0.93 | 0.82 | 0.74 | 1.79 | 1.44 | 0.76 | p | 0.38 | 13.07 | a | |||||||||
1994 | 0.53 | 0.68 | 1.11 | 1.30 | 0.78 | 1.17 | 0.81 | c | 1.96 | 0.82 | 0.71 | 1.27 | 0.75 | 11.89 | ||||||||||||
1995 | 0.41 | b | ----- | z | 3.00 | f | 2.62 | 3.82 | c | 1.04 | 3.04 | f | 0.93 | d | 1.56 | 1.14 | 1.67 | 0.77 | 13.96 | c | ||||||
1996 | 2.47 | b | 2.69 | 0.81 | 1.36 | b | 0.92 | 0.63 | 1.35 | 0.06 | 2.68 | a | 1.31 | 1.92 | b | 1.05 | 17.25 | |||||||||
1997 | 1.55 | 1.22 | 1.28 | 2.92 | 2.46 | 0.79 | 0.89 | 2.82 | 2.43 | 1.79 | c | 0.70 | 0.38 | 19.23 | ||||||||||||
1998 | 0.96 | 0.82 | 0.92 | 1.30 | 0.09 | a | 0.65 | l | 3.05 | o | 1.58 | n | ----- | z | 1.28 | 1.75 | a | 1.34 | 8.46 | d | ||||||
1999 | 0.70 | 0.60 | 0.90 | 1.00 | b | 1.92 | 1.59 | 0.73 | 1.77 | 0.53 | 0.59 | 0.58 | n | 1.37 | i | 10.33 | b | |||||||||
2000 | 0.38 | b | 0.60 | 0.85 | 1.60 | 1.77 | 1.52 | 0.40 | 3.96 | 1.59 | 0.78 | 0.39 | a | 0.83 | 14.67 | |||||||||||
2001 | 0.33 | 0.45 | a | 0.79 | 1.77 | 1.47 | 0.96 | 0.67 | 1.22 | 1.56 | 0.66 | 0.97 | 0.49 | 11.34 | ||||||||||||
2002 | 1.07 | 0.39 | 1.30 | a | 1.12 | 0.76 | d | 0.11 | 0.57 | e | 1.93 | i | 1.94 | m | 2.07 | t | 2.22 | p | 0.14 | f | 5.32 | e | ||||
2003 | 0.19 | k | 1.52 | j | 1.80 | q | 0.93 | k | 1.73 | i | 0.88 | i | 0.44 | b | 2.65 | m | 1.60 | m | 0.31 | n | 1.48 | h | 0.58 | j | 0.44 | k |
2004 | 0.94 | k | 0.72 | o | 0.45 | j | 1.49 | l | 0.47 | o | 1.74 | m | 0.81 | 1.64 | r | 2.03 | j | 1.09 | 1.43 | n | 0.14 | j | 1.90 | j | ||
2005 | 1.48 | e | 0.70 | p | 0.21 | o | 1.31 | o | 0.97 | q | 1.45 | w | 1.04 | h | 1.62 | p | 2.36 | t | 2.74 | t | 0.72 | q | 0.93 | r | 1.48 | k |
2006 | 1.16 | r | 1.02 | n | 1.08 | q | 0.40 | o | 1.03 | l | 0.28 | q | 2.21 | y | 1.16 | k | 2.12 | l | 1.23 | o | 1.05 | o | 0.73 | q | 0.00 | l |
2007 | 1.47 | p | 0.61 | n | 0.94 | o | 1.74 | m | 0.80 | o | 0.48 | m | 1.83 | x | ----- | z | 1.68 | 2.32 | f | 0.56 | q | 1.67 | p | 1.68 | k | |
2008 | 1.71 | n | 0.85 | m | 1.78 | n | 1.43 | l | 2.19 | o | 0.80 | m | 1.03 | o | 1.61 | q | 1.42 | m | 0.22 | q | 0.44 | r | 2.43 | q | 0.00 | l |
2009 | 0.88 | l | 0.17 | m | 1.11 | i | 1.66 | n | 0.49 | s | 2.27 | p | 0.51 | u | 1.05 | v | 0.44 | q | 0.57 | v | 0.12 | q | 0.74 | s | 0.00 | l |
2010 | 0.14 | q | 0.65 | p | 0.56 | p | 1.90 | l | 1.42 | r | 1.18 | m | 1.01 | m | 2.19 | p | 0.55 | o | 1.52 | r | 1.38 | n | 0.89 | r | 0.00 | l |
2011 | 0.50 | n | 1.28 | n | 1.70 | n | 2.60 | k | 2.24 | o | 0.83 | o | 1.29 | o | 0.49 | i | 1.98 | S | 1.90 | q | 0.88 | m | 0.26 | r | 0.00 | l |
2012 | 0.49 | n | 0.50 | p | 0.10 | k | 0.15 | l | 0.08 | t | 0.94 | p | 3.31 | p | 0.60 | u | 0.48 | x | 1.26 | S | 0.22 | S | 0.96 | x | 0.00 | l |
2013 | 0.52 | w | 0.89 | n | 0.30 | u | 3.40 | p | 1.32 | S | 0.03 | t | 2.28 | p | 0.25 | s | 4.43 | s | 1.38 | s | 0.69 | n | 1.16 | s | 0.00 | l |
2014 | 0.85 | t | 1.58 | q | 0.47 | m | 1.07 | j | 1.53 | v | 0.10 | x | 1.54 | m | 0.79 | s | 1.51 | s | 1.75 | S | 0.95 | u | 0.28 | y | 0.00 | l |
2015 | 1.51 | u | 0.52 | m | 0.45 | m | 0.52 | i | 3.41 | S | 0.25 | s | 1.91 | o | 0.85 | r | 1.21 | w | 1.07 | w | 1.00 | t | 0.58 | t | 0.00 | l |
2016 | 0.55 | v | 1.10 | t | 1.35 | k | 1.91 | m | 2.91 | s | 0.64 | w | 1.19 | v | 1.69 | q | 0.14 | S | 1.08 | r | ----- | z | 1.22 | S | 0.00 | l |
2017 | 1.50 | v | 0.43 | p | 0.69 | S | 2.29 | m | 2.38 | t | 0.52 | n | 1.08 | q | 1.54 | S | 0.45 | r | 2.52 | u | 0.55 | r | 0.44 | u | 0.00 | l |
2018 | 0.65 | r | 1.26 | r | 0.87 | r | 0.07 | x | ----- | z | ----- | z | ----- | z | ----- | z | 0.25 | q | 0.26 | y | ----- | z | 0.53 | t | 0.00 | l |
2019 | 0.14 | y | ----- | z | 1.69 | p | 1.64 | q | 2.71 | S | 1.71 | t | 0.36 | r | 1.01 | n | 0.68 | t | ----- | z | 0.42 | y | 1.36 | u | 0.00 | l |
2020 | 0.75 | v | 1.88 | x | 0.33 | x | 1.04 | j | 1.08 | u | 0.71 | r | 0.53 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.00 | l |
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 1.04 | 0.96 | 1.36 | 1.49 | 1.59 | 1.22 | 1.38 | 1.49 | 1.29 | 1.09 | 1.10 | 0.99 | 15.18 | |||||||||||||
S.D. | 0.70 | 0.54 | 0.54 | 0.68 | 0.90 | 0.89 | 0.77 | 0.86 | 0.95 | 0.68 | 0.66 | 0.70 | 2.97 | |||||||||||||
SKEW | 0.95 | 1.04 | 0.29 | 0.58 | 0.91 | 1.36 | 0.89 | 1.36 | 2.12 | 1.23 | 0.82 | 1.58 | 0.73 | |||||||||||||
MAX | 2.87 | 2.69 | 2.62 | 3.05 | 4.47 | 4.66 | 3.79 | 4.70 | 5.95 | 3.48 | 2.77 | 3.47 | 22.37 | |||||||||||||
MIN | 0.00 | 0.07 | 0.41 | 0.30 | 0.09 | 0.01 | 0.40 | 0.06 | 0.06 | 0.03 | 0.12 | 0.12 | 10.39 | |||||||||||||
YRS | 64 | 60 | 62 | 63 | 63 | 62 | 63 | 61 | 62 | 64 | 61 | 61 | 53 |