YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1937 | 0.76 | b | 0.81 | 0.54 | 1.32 | 0.31 | 2.35 | 0.35 | 0.43 | 0.26 | 0.40 | a | 2.01 | 1.35 | 10.89 | |||||||||||
1938 | 1.18 | 1.94 | 2.00 | 0.99 | a | 0.28 | 1.10 | 0.56 | 0.65 | 0.65 | 0.78 | 0.46 | 0.11 | 10.70 | ||||||||||||
1939 | 0.55 | a | 0.88 | 0.70 | 0.00 | 0.39 | 0.37 | 0.35 | 0.05 | 0.71 | 1.40 | b | 0.00 | 1.66 | 7.06 | |||||||||||
1940 | 1.43 | 2.24 | 1.87 | 1.55 | 0.28 | 0.08 | 0.37 | 0.00 | 1.25 | 1.44 | 1.34 | 0.72 | 12.57 | |||||||||||||
1941 | 1.96 | 1.66 | 0.04 | 0.60 | 2.02 | 1.40 | 0.76 | 3.62 | 0.67 | 1.04 | 1.15 | 1.01 | 15.93 | |||||||||||||
1942 | 1.54 | 1.28 | 0.16 | 0.36 | 3.30 | 1.17 | 0.18 | 0.04 | 1.46 | 0.26 | 3.15 | 1.64 | 14.54 | |||||||||||||
1943 | 1.98 | 0.30 | 0.72 | 1.18 | 0.53 | 1.26 | 0.00 | 0.25 | 0.00 | 1.57 | 0.75 | 0.27 | a | 8.81 | ||||||||||||
1944 | 0.82 | 0.92 | 0.38 | 0.80 | 1.05 | 4.73 | 0.55 | 0.15 | 0.20 | 0.78 | a | 1.55 | 1.22 | 13.15 | ||||||||||||
1945 | 1.04 | 1.19 | 0.74 | 0.38 | 3.15 | 1.09 | 0.10 | 0.03 | 0.31 | 0.82 | 1.39 | 1.79 | 12.03 | |||||||||||||
1946 | 0.81 | 0.65 | 0.59 | 0.27 | 1.67 | 0.95 | 0.24 | 0.04 | 0.74 | 1.38 | 1.74 | 0.17 | 9.25 | |||||||||||||
1947 | 0.88 | 0.71 | 0.49 | 1.23 | 1.15 | 2.73 | 0.00 | 1.16 | 0.30 | 3.59 | 1.43 | 1.86 | 15.53 | |||||||||||||
1948 | 0.58 | 1.10 | 1.31 | 1.32 | 2.31 | 1.52 | 0.00 | a | 0.63 | 1.30 | 0.24 | 1.09 | 2.62 | 14.02 | ||||||||||||
1949 | 0.73 | 0.20 | 1.37 | 0.39 | 1.16 | 0.15 | 0.00 | 0.15 | 0.07 | 0.28 | 0.85 | 0.46 | 5.81 | |||||||||||||
1950 | 1.84 | a | 0.44 | 1.11 | 0.29 | 0.37 | 1.54 | a | 0.14 | 0.16 | 0.06 | 2.03 | 1.19 | 2.94 | 12.11 | |||||||||||
1951 | 1.53 | 0.95 | 1.02 | 0.41 | a | 1.13 | 0.06 | 0.00 | 0.23 | 0.51 | 1.38 | 0.58 | c | 2.70 | d | 10.50 | ||||||||||
1952 | 0.52 | a | 1.65 | 1.10 | 0.20 | 0.85 | 1.56 | 0.00 | 0.17 | 0.22 | 0.00 | 1.32 | 2.23 | 9.82 | ||||||||||||
1953 | 1.20 | 1.27 | 1.10 | 0.57 | 3.82 | 2.21 | 0.00 | 1.03 | 0.01 | 0.28 | 1.30 | 1.65 | 14.44 | |||||||||||||
1954 | 1.20 | 0.35 | 0.91 | 0.78 | 0.92 | a | 1.03 | 0.00 | 0.23 | 0.09 | 0.10 | 0.45 | 0.70 | 6.76 | ||||||||||||
1955 | 0.70 | 0.50 | 0.70 | 1.91 | 0.18 | a | 0.41 | 0.57 | 0.00 | 1.02 | 0.49 | c | 1.80 | 1.97 | a | 10.25 | ||||||||||
1956 | 3.20 | 1.00 | 0.65 | 0.20 | 2.92 | a | 0.80 | 0.48 | 0.38 | 0.15 | 2.57 | 0.18 | 0.65 | h | 12.53 | a | ||||||||||
1957 | 1.40 | 1.09 | b | 3.21 | a | 0.75 | 2.70 | 0.19 | a | 0.31 | 0.19 | 0.43 | 3.39 | 1.19 | 1.80 | 16.65 | ||||||||||
1958 | 2.45 | 2.00 | 1.00 | 0.88 | 1.10 | 1.97 | a | 0.36 | 0.31 | 0.19 | 0.00 | 0.72 | 0.95 | 11.93 | ||||||||||||
1959 | 0.90 | 0.82 | a | 0.67 | 0.25 | 1.03 | 0.50 | 0.11 | 0.51 | 0.56 | 0.87 | 0.00 | 0.05 | d | 6.27 | |||||||||||
1960 | 1.65 | 1.65 | 1.65 | 0.69 | 1.64 | 0.29 | 0.20 | 0.74 | 0.03 | 0.12 | a | 1.54 | 0.70 | 10.90 | ||||||||||||
1961 | 0.40 | 1.08 | 0.94 | 0.10 | a | 1.36 | 0.90 | 0.44 | 0.40 | 0.58 | a | 0.76 | 0.85 | 1.50 | 9.31 | |||||||||||
1962 | 0.75 | 1.52 | 0.48 | 0.20 | 0.78 | 0.10 | 0.00 | 0.07 | 0.20 | 3.38 | 0.90 | 0.60 | 8.98 | |||||||||||||
1963 | 1.15 | 1.35 | 0.50 | 2.35 | 1.45 | 1.59 | 0.23 | 0.21 | 1.29 | 0.37 | 0.68 | a | 0.98 | 12.15 | ||||||||||||
1964 | 2.42 | 0.05 | 0.90 | 0.39 | 0.77 | 2.45 | 1.38 | 1.18 | 0.05 | 0.59 | 1.16 | a | 4.91 | 16.25 | ||||||||||||
1965 | 1.82 | 0.23 | 0.12 | 0.80 | 0.26 | 2.54 | 0.90 | 2.04 | 0.00 | 0.10 | 1.70 | 0.35 | 10.86 | |||||||||||||
1966 | 1.15 | 0.61 | 0.99 | a | 0.27 | 1.00 | 1.56 | 0.13 | 0.35 | 1.44 | 0.14 | 2.39 | 2.52 | 12.55 | ||||||||||||
1967 | 1.89 | 0.15 | 1.31 | 1.01 | 0.99 | 0.51 | 0.05 | 0.91 | 0.32 | 1.16 | 0.39 | 0.35 | a | 9.04 | ||||||||||||
1968 | 1.05 | 0.75 | 0.05 | 0.03 | 0.50 | 0.32 | 0.08 | 2.72 | 0.20 | 0.86 | 2.45 | a | 0.90 | 9.91 | ||||||||||||
1969 | 1.80 | e | 0.50 | 0.35 | 0.70 | 1.00 | 1.92 | 0.05 | 0.00 | 0.35 | 1.04 | 0.67 | 2.05 | u | 8.38 | a | ||||||||||
1970 | 2.80 | 0.15 | 0.45 | 0.40 | 1.14 | 0.82 | 0.32 | 0.00 | 0.08 | 0.94 | 2.40 | 1.16 | 10.66 | |||||||||||||
1971 | 1.55 | 0.41 | 1.20 | 1.10 | 1.96 | 0.63 | 0.37 | 0.01 | 0.74 | 1.06 | 1.35 | 1.15 | 11.53 | |||||||||||||
1972 | 1.00 | 0.70 | e | 0.95 | b | 0.30 | 1.37 | 0.63 | 0.04 | 0.02 | 0.38 | 0.30 | 1.08 | 1.50 | 8.27 | |||||||||||
1973 | 0.70 | 0.55 | 0.43 | 0.29 | 1.85 | 0.03 | 0.07 | 0.82 | 0.85 | 0.67 | 2.40 | 1.43 | 10.09 | |||||||||||||
1974 | 0.55 | 0.60 | 1.43 | 0.59 | 0.58 | 0.19 | 0.66 | 0.08 | 0.00 | 0.32 | 0.19 | 1.42 | a | 6.61 | ||||||||||||
1975 | 0.95 | b | 0.75 | f | 1.00 | a | 0.30 | d | 1.00 | d | 0.31 | 1.02 | 0.38 | 0.05 | 1.17 | m | 0.58 | 1.35 | t | 5.59 | c | |||||
1976 | 1.75 | a | 1.10 | 0.03 | 0.70 | 0.25 | 0.77 | 0.42 | 3.45 | 0.58 | 0.26 | 0.34 | 0.05 | 9.70 | ||||||||||||
1977 | 0.52 | 0.40 | 0.25 | 0.35 | 2.02 | 1.52 | 0.11 | 0.66 | 1.34 | 0.34 | 1.88 | 1.45 | 10.84 | |||||||||||||
1978 | 1.65 | 0.75 | 1.30 | ----- | z | 0.60 | 0.92 | 0.14 | 0.70 | 0.53 | 0.02 | 1.35 | 0.55 | 8.51 | a | |||||||||||
1979 | 2.45 | c | 1.40 | 1.00 | f | 0.82 | 0.26 | 0.68 | 0.05 | 1.68 | 0.70 | 1.02 | 1.50 | 1.05 | 11.61 | a | ||||||||||
1980 | 0.70 | 1.10 | a | 0.00 | g | 0.35 | 1.51 | 1.63 | 0.65 | 0.02 | 1.06 | 1.07 | 0.60 | a | 0.50 | o | 8.69 | b | ||||||||
1981 | 1.35 | i | 0.35 | 1.10 | 1.18 | a | 1.99 | 0.64 | 0.07 | 0.12 | 0.44 | 1.49 | 2.67 | 3.15 | d | 13.20 | a | |||||||||
1982 | 0.75 | v | ----- | z | ----- | z | 1.04 | f | 0.25 | 1.39 | c | 1.03 | 0.42 | 1.93 | 0.81 | 0.65 | e | 1.50 | m | 6.48 | e | |||||
1983 | 0.50 | c | 1.50 | p | 1.16 | e | 0.50 | r | 1.32 | c | 0.42 | 0.77 | 0.69 | 0.60 | 1.11 | b | 0.69 | t | 3.49 | j | 6.57 | d | ||||
1984 | 0.18 | g | 0.44 | q | 2.70 | k | 1.12 | e | 0.69 | 1.52 | b | 0.61 | b | 2.18 | 0.10 | m | 1.84 | p | 1.43 | p | 1.40 | c | 7.52 | f | ||
1985 | 3.90 | a | 0.50 | 0.55 | 0.50 | 1.10 | 0.17 | 0.28 | 0.32 | 1.54 | p | 2.30 | e | 0.61 | m | 1.31 | c | 10.93 | b | |||||||
1986 | 1.06 | c | 3.24 | e | 1.22 | 0.39 | 1.45 | 0.34 | 0.14 | 0.06 | a | 1.68 | e | 0.34 | 0.79 | 0.34 | 11.05 | |||||||||
1987 | 0.83 | a | 1.03 | a | 1.01 | 1.14 | 1.39 | 1.13 | 1.69 | 0.32 | 0.00 | 0.01 | 1.69 | g | 1.25 | 9.80 | a | |||||||||
1988 | 0.78 | 0.56 | 0.51 | b | 2.30 | 1.20 | 0.75 | 0.00 | 0.53 | 0.15 | 0.00 | 1.92 | 0.81 | 9.51 | ||||||||||||
1989 | 1.14 | a | 0.96 | 2.86 | 0.98 | 1.74 | 0.31 | 0.17 | 0.98 | 1.49 | 0.28 | 0.50 | a | 0.30 | 11.71 | |||||||||||
1990 | 0.56 | 0.26 | a | 1.17 | 0.52 | 1.07 | 0.57 | 0.04 | 0.66 | 0.30 | 0.45 | 1.04 | ----- | z | 6.64 | a | ||||||||||
1991 | 0.32 | 0.45 | 1.48 | 0.99 | 2.19 | 1.41 | 0.28 | 0.59 | 0.01 | 0.99 | 1.58 | 0.85 | 11.14 | |||||||||||||
1992 | 0.45 | 0.69 | 1.43 | 0.57 | 0.12 | 1.92 | 0.75 | 0.29 | 0.47 | 2.24 | 1.20 | 1.63 | c | 11.76 | ||||||||||||
1993 | 2.86 | 1.01 | 2.41 | 2.43 | c | 1.69 | b | 1.02 | 2.56 | 1.28 | 0.03 | 0.55 | 0.04 | e | ----- | z | 15.88 | a | ||||||||
1994 | ----- | z | 0.85 | b | 0.80 | 0.98 | 1.05 | 1.07 | 0.31 | 0.08 | 0.35 | 0.59 | 1.75 | a | 0.80 | 8.63 | a | |||||||||
1995 | 2.76 | b | 0.87 | a | 1.65 | 2.88 | c | 1.12 | 1.66 | 0.42 | 0.25 | 0.25 | 0.43 | 1.08 | 3.51 | b | 16.88 | |||||||||
1996 | 1.61 | a | 1.15 | a | 0.93 | 0.95 | 1.62 | ----- | z | 0.08 | 0.43 | 0.33 | 0.97 | 1.23 | b | 2.24 | 11.54 | a | ||||||||
1997 | 3.19 | 0.52 | 0.40 | 1.75 | a | 2.05 | b | 0.95 | 0.80 | 0.13 | 0.48 | 0.52 | 0.95 | b | 2.73 | e | 14.47 | |||||||||
1998 | 2.15 | c | 3.17 | 1.33 | 1.39 | 4.11 | 0.61 | 0.54 | 0.02 | 1.09 | 0.29 | 2.94 | a | 1.11 | f | 17.64 | a | |||||||||
1999 | 2.60 | 1.49 | 2.93 | d | ----- | z | 1.19 | 0.20 | a | 0.11 | 0.26 | 0.01 | 0.57 | 0.46 | 0.29 | a | 10.11 | a | ||||||||
2000 | 2.12 | b | 2.11 | 2.46 | b | 0.67 | a | 0.52 | 0.30 | b | 0.10 | ----- | z | 1.04 | 1.70 | a | 1.17 | j | 0.73 | e | 11.75 | b | ||||
2001 | 0.29 | 0.20 | b | 1.14 | a | 0.08 | 0.70 | 0.49 | e | 0.37 | d | 0.15 | g | 0.70 | 0.30 | 0.54 | d | 1.43 | d | 6.24 | a | |||||
2002 | 0.33 | d | 0.02 | a | 0.30 | a | 0.38 | 0.53 | 0.09 | 0.05 | 0.00 | 0.05 | 0.18 | 0.23 | 0.70 | a | 2.86 | |||||||||
2003 | 1.68 | 0.51 | 0.75 | 1.68 | 0.95 | 0.00 | 0.53 | a | 0.00 | 0.90 | 0.13 | 1.05 | c | 0.66 | c | 8.84 | ||||||||||
2004 | 1.77 | 0.48 | c | 0.28 | 0.34 | 2.42 | d | 0.46 | 0.21 | 1.13 | a | 0.09 | 1.64 | 0.45 | a | 2.16 | 11.43 | |||||||||
2005 | 0.40 | e | 0.22 | a | 0.66 | b | 0.82 | h | 1.44 | g | 1.02 | d | 0.65 | b | 0.00 | 0.62 | 1.26 | b | 3.03 | c | 1.11 | h | 7.86 | c | ||
2006 | 1.32 | i | 0.18 | 0.38 | c | 1.05 | f | 0.63 | e | 1.22 | c | 0.71 | b | 0.21 | b | 0.13 | b | 0.79 | c | 0.79 | e | 0.47 | e | 5.51 | b | |
2007 | 0.00 | 1.23 | e | 0.11 | a | 0.94 | g | ----- | z | 1.08 | c | 0.00 | 0.49 | b | 0.74 | a | 0.96 | c | 0.43 | d | 0.83 | i | 5.04 | c | ||
2008 | 0.97 | e | 0.23 | c | 0.14 | b | 0.39 | b | 1.70 | b | 0.53 | j | 0.16 | 0.00 | 0.19 | b | 0.88 | b | 0.96 | c | 0.87 | g | 5.62 | b | ||
2009 | 0.19 | b | 0.52 | f | 0.27 | c | 1.34 | d | 1.32 | b | 2.77 | g | 0.00 | 0.91 | c | 0.00 | 1.15 | b | 1.54 | f | 0.36 | g | 5.18 | d | ||
2010 | 1.64 | e | 0.42 | b | 0.53 | b | 2.12 | b | 1.00 | f | 1.07 | 0.00 | 0.30 | 0.00 | 1.15 | 1.04 | a | 1.71 | c | 9.98 | a | |||||
2011 | ----- | z | 1.00 | v | 1.47 | s | 0.93 | x | 2.85 | 0.44 | g | 0.00 | 0.00 | 0.00 | 0.69 | a | ----- | z | 0.17 | 3.71 | f | |||||
2012 | 0.60 | 0.12 | 0.65 | k | 1.00 | 0.33 | i | 0.98 | 0.00 | 0.00 | i | 0.00 | 0.66 | 0.77 | 1.25 | 5.38 | c | |||||||||
2013 | 1.27 | y | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 1.99 | w | ----- | z | ----- | z | ----- | z | 0.00 | l |
2014 | 0.72 | y | 1.10 | u | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 0.43 | f | 1.63 | b | 1.63 | k |
2015 | 0.06 | g | 1.15 | 0.53 | 0.28 | 2.57 | j | 0.00 | 0.50 | 0.00 | 0.00 | c | 0.83 | 0.76 | c | 1.00 | c | 5.05 | b | |||||||
2016 | 1.10 | b | 0.20 | 0.00 | b | 0.03 | 0.68 | 0.78 | 0.00 | y | 0.00 | 0.52 | 1.32 | 0.45 | 1.43 | 6.51 | a | |||||||||
2017 | 1.76 | 0.03 | x | 0.80 | 0.38 | c | 0.00 | 0.00 | t | ----- | z | 0.00 | 0.00 | 1.22 | 0.92 | 0.00 | 5.08 | c | ||||||||
2018 | 1.59 | 0.20 | 0.37 | 0.03 | 0.40 | 0.50 | 0.00 | n | 0.00 | 0.00 | i | 0.35 | 0.16 | 0.78 | s | 3.60 | c | |||||||||
2019 | 0.53 | 1.97 | b | 0.60 | c | ----- | z | ----- | z | 0.14 | 0.43 | 0.20 | 1.20 | 0.00 | 0.25 | 1.23 | 6.55 | b | ||||||||
2020 | 0.74 | g | 0.13 | 0.83 | 0.53 | 0.81 | 0.48 | o | 0.00 | 0.00 | 0.00 | a | 0.13 | 1.45 | 0.30 | 4.18 | b | |||||||||
2021 | 0.47 | 0.86 | c | 0.00 | 0.55 | d | 0.00 | 0.45 | 0.00 | 0.15 | 0.25 | 0.85 | 0.76 | 1.33 | 5.67 | |||||||||||
2022 | 0.57 | 0.03 | 0.03 | 0.26 | b | 1.00 | 0.85 | 0.00 | c | 0.00 | 0.37 | 0.02 | 1.06 | 1.07 | 5.26 | |||||||||||
2023 | 0.71 | 0.19 | 1.37 | 0.12 | 1.26 | 0.29 | 0.00 | 0.73 | 0.60 | b | 0.07 | 0.47 | 0.74 | b | 6.55 | |||||||||||
2024 | 2.41 | 0.00 | 0.06 | b | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 2.47 | i | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 1.30 | 0.84 | 0.89 | 0.77 | 1.24 | 0.95 | 0.33 | 0.49 | 0.47 | 0.84 | 1.11 | 1.26 | 10.66 | |||||||||||||
S.D. | 0.82 | 0.67 | 0.68 | 0.62 | 0.87 | 0.79 | 0.42 | 0.71 | 0.47 | 0.77 | 0.73 | 0.90 | 3.11 | |||||||||||||
SKEW | 0.87 | 1.36 | 1.28 | 1.30 | 1.14 | 1.74 | 2.57 | 2.60 | 1.06 | 1.63 | 0.88 | 1.28 | -0.07 | |||||||||||||
MAX | 3.90 | 3.24 | 3.21 | 2.88 | 4.11 | 4.73 | 2.56 | 3.62 | 1.93 | 3.59 | 3.15 | 4.91 | 16.88 | |||||||||||||
MIN | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 2.86 | |||||||||||||
YRS | 78 | 79 | 80 | 76 | 79 | 79 | 82 | 82 | 82 | 83 | 78 | 72 | 51 |