| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1936 | 5.02 | s | 2.79 | 0.38 | 0.45 | 2.41 | 0.72 | 0.35 | 0.17 | 0.04 | z | 0.00 | z | 0.00 | z | 2.02 | 9.29 | |||||||||
| 1937 | 2.22 | 4.57 | 3.39 | 2.37 | 0.90 | 1.90 | s | 0.00 | 0.00 | 0.04 | 2.20 | 7.26 | 5.08 | 28.03 | ||||||||||||
| 1938 | 3.00 | 5.65 | 4.60 | 1.01 | 0.42 | 0.39 | 0.54 | 0.00 | 0.46 | 0.20 | 1.95 | 1.93 | 20.15 | |||||||||||||
| 1939 | 2.47 | 1.42 | 2.95 | 0.60 | 0.84 | 0.12 | 0.18 | 0.00 | 1.74 | 0.43 | 0.04 | 7.21 | 18.00 | |||||||||||||
| 1940 | 3.38 | 6.97 | 4.39 | 0.60 | 0.53 | 0.90 | 0.00 | z | 0.10 | 1.39 | 1.87 | 0.97 | 6.65 | 27.75 | ||||||||||||
| 1941 | 4.26 | 2.87 | 2.66 | 2.81 | 1.45 | 0.95 | 1.07 | 0.56 | 0.65 | 0.47 | 2.20 | 7.23 | 27.18 | |||||||||||||
| 1942 | 2.56 | 3.54 | 0.18 | 1.26 | 3.78 | 0.46 | 0.00 | 0.20 | 0.06 | 0.62 | 6.43 | 4.95 | 24.04 | |||||||||||||
| 1943 | 5.63 | 1.05 | 1.94 | 1.14 | 0.27 | 0.75 | 0.17 | 0.01 | 0.00 | 2.93 | 1.35 | 0.70 | 15.94 | |||||||||||||
| 1944 | 2.33 | 1.79 | 2.06 | 0.82 | 0.51 | 1.06 | 1.33 | 0.70 | 0.00 | 0.67 | 3.87 | 1.37 | 16.51 | |||||||||||||
| 1945 | 0.81 | 3.13 | 1.62 | 0.69 | 4.05 | 0.30 | 0.00 | 0.27 | 0.03 | 1.91 | 3.94 | 5.44 | 22.19 | |||||||||||||
| 1946 | 2.74 | 2.06 | 0.76 | 0.32 | 0.78 | 0.53 | 1.54 | 0.00 | 0.11 | 1.63 | 4.61 | 1.13 | 16.21 | |||||||||||||
| 1947 | 1.17 | x | 1.62 | 2.99 | 0.47 | 0.24 | 0.64 | 0.44 | 0.23 | 0.00 | 2.81 | 0.89 | 0.74 | 11.07 | ||||||||||||
| 1948 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.22 | 0.17 | 0.95 | 1.01 | 2.82 | 3.85 | 9.02 | |||||||
| 1949 | 0.39 | 2.56 | 1.03 | 0.34 | 1.73 | j | 0.32 | 0.01 | 0.03 | 0.34 | 0.76 | 1.67 | 1.01 | 8.46 | ||||||||||||
| 1950 | 6.40 | 0.90 | 3.56 | 0.83 | 0.33 | 0.95 | 0.00 | 1.74 | 0.18 | 7.41 | 2.31 | 3.97 | 28.58 | |||||||||||||
| 1951 | 5.95 | 3.12 | 0.29 | 2.05 | 0.41 | 0.00 | 0.00 | 0.84 | 0.07 | 2.02 | 4.10 | 8.14 | 26.99 | |||||||||||||
| 1952 | 4.88 | 2.83 | 1.84 | 0.81 | 0.86 | 1.74 | 0.83 | 0.01 | 0.37 | 0.33 | 1.79 | 8.49 | 24.78 | |||||||||||||
| 1953 | 6.67 | 1.21 | 2.43 | 0.78 | 3.40 | 0.72 | 0.00 | 0.22 | 0.02 | 1.47 | 3.82 | 1.75 | 22.49 | |||||||||||||
| 1954 | 11.01 | 2.60 | 2.03 | 1.39 | b | 0.00 | 1.04 | 0.00 | 1.66 | 0.64 | 0.39 | 1.08 | 2.49 | 24.33 | ||||||||||||
| 1955 | 1.78 | 0.57 | 0.54 | 0.46 | 0.02 | 0.00 | 0.00 | 0.20 | 0.09 | 0.77 | 5.22 | 11.16 | 20.81 | |||||||||||||
| 1956 | 7.72 | 4.48 | 0.94 | 0.60 | 0.55 | 0.10 | 0.09 | 0.07 | 0.82 | 4.11 | 0.11 | 1.06 | 20.65 | |||||||||||||
| 1957 | 3.21 | 3.04 | 4.81 | 0.70 | 1.59 | 0.00 | 0.09 | 0.04 | 0.88 | 3.22 | 2.85 | 5.53 | 25.96 | |||||||||||||
| 1958 | 5.89 | 7.60 | 1.74 | 0.53 | 0.82 | 4.44 | 1.84 | 0.64 | 0.23 | 0.49 | 1.18 | 2.34 | 27.74 | |||||||||||||
| 1959 | 4.70 | 3.08 | 1.21 | 0.04 | 0.09 | 0.00 | 0.00 | 0.39 | 0.42 | 0.09 | 0.00 | 1.25 | 11.27 | |||||||||||||
| 1960 | 2.31 | 7.30 | 3.29 | 0.32 | 1.56 | 1.14 | 0.01 | 0.00 | 0.00 | 0.34 | 6.00 | 2.94 | 25.21 | |||||||||||||
| 1961 | 2.12 | 3.55 | 3.22 | 0.51 | 0.94 | 0.39 | 0.06 | 0.50 | 1.65 | 1.31 | 3.29 | 2.29 | 19.83 | |||||||||||||
| 1962 | 1.71 | 2.70 | 1.56 | 0.70 | 1.52 | 0.00 | 0.05 | 0.75 | 0.48 | 5.78 | 4.03 | 3.65 | 22.93 | |||||||||||||
| 1963 | 1.83 | 3.55 | 1.68 | 3.18 | 1.56 | 0.15 | 0.11 | 0.08 | 0.07 | 1.37 | 4.60 | 1.28 | 19.46 | |||||||||||||
| 1964 | 6.21 | 0.38 | 1.46 | 0.11 | 0.27 | 0.62 | 0.44 | 0.02 | 0.19 | 0.39 | 3.24 | 11.90 | 25.23 | |||||||||||||
| 1965 | 4.48 | 0.82 | 0.01 | 2.56 | 0.23 | 0.32 | 0.61 | 2.61 | 0.33 | 0.04 | 2.25 | 2.99 | 17.25 | |||||||||||||
| 1966 | 6.52 | 0.51 | 1.81 | 0.74 | 0.76 | 0.33 | 0.13 | 0.03 | 1.59 | 0.20 | 3.73 | 5.11 | 21.46 | |||||||||||||
| 1967 | 6.27 | 0.21 | 2.77 | 1.60 | 0.02 | 3.22 | 0.35 | 0.33 | 0.17 | 1.62 | 1.51 | 5.43 | 23.50 | |||||||||||||
| 1968 | 4.23 | 3.16 | 1.28 | 0.07 | 0.24 | 0.53 | 0.00 | 0.67 | 0.13 | 1.34 | 2.99 | 5.20 | 19.84 | |||||||||||||
| 1969 | 7.98 | 1.85 | 0.23 | 0.64 | 0.52 | 1.31 | 0.53 | 0.00 | 0.24 | 1.45 | 0.55 | 8.82 | 24.12 | |||||||||||||
| 1970 | 10.44 | 2.28 | 0.99 | 0.65 | 0.37 | 0.98 | 0.41 | 0.00 | 0.09 | 1.79 | 8.15 | 8.92 | 35.07 | |||||||||||||
| 1971 | 4.01 | 0.29 | 5.21 | 0.96 | 1.49 | 0.12 | 0.06 | 0.38 | 0.69 | 0.66 | 3.97 | 2.77 | 20.61 | |||||||||||||
| 1972 | 7.30 | 3.12 | 2.64 | 1.20 | 0.96 | 1.43 | 0.00 | 0.39 | 2.47 | 0.66 | 1.77 | 6.15 | 28.09 | |||||||||||||
| 1973 | 4.17 | 1.28 | 0.66 | 0.78 | 0.34 | 0.00 | 0.02 | 0.00 | 1.71 | 3.86 | 7.17 | 5.15 | 25.14 | |||||||||||||
| 1974 | 7.13 | 2.62 | 3.33 | 3.92 | 0.05 | 0.14 | 0.79 | 0.04 | 0.00 | 0.42 | 1.51 | 2.17 | 22.12 | |||||||||||||
| 1975 | 2.74 | 7.13 | 6.90 | 0.78 | 0.23 | 0.19 | 0.58 | 0.25 | 0.02 | 2.81 | 2.25 | 2.17 | 26.05 | |||||||||||||
| 1976 | 0.72 | 2.20 | b | 0.79 | a | 1.01 | 0.15 | 0.40 | 1.03 | 2.14 | 1.30 | 0.15 | 0.56 | 0.21 | 10.66 | |||||||||||
| 1977 | 1.23 | 1.62 | 1.01 | 0.15 | 1.57 | 1.45 | 0.27 | 0.10 | 1.88 | 0.52 | 4.58 | 6.17 | 20.55 | |||||||||||||
| 1978 | 3.99 | 2.09 | 2.84 | 1.72 | 0.24 | 1.50 | 0.90 | 1.24 | 2.39 | 0.00 | 1.00 | 0.88 | 18.79 | |||||||||||||
| 1979 | 1.98 | 3.86 | 0.93 | 2.02 | 1.61 | 0.02 | 1.03 | 1.08 | 0.52 | 3.38 | 3.86 | 3.34 | 23.63 | |||||||||||||
| 1980 | 3.97 | 3.81 | 1.24 | 1.51 | 0.49 | 1.11 | 0.00 | 0.00 | 0.13 | 0.65 | 1.04 | S | 4.99 | 18.94 | ||||||||||||
| 1981 | 1.77 | 2.07 | 1.02 | 0.81 | 0.40 | 0.02 | 0.00 | 0.00 | 0.50 | 2.06 | 7.21 | 7.82 | 23.68 | |||||||||||||
| 1982 | 2.38 | c | 4.32 | g | 3.09 | g | 0.51 | d | 0.00 | 2.09 | 0.11 | 0.10 | a | 0.36 | a | 3.16 | a | 3.75 | d | 7.86 | b | 20.32 | ||||
| 1983 | 2.11 | d | 4.81 | j | 5.51 | h | 0.94 | f | 0.52 | c | 0.00 | 0.03 | 3.61 | e | 0.82 | 0.56 | g | 6.77 | h | 6.22 | i | 7.09 | ||||
| 1984 | 0.26 | f | 2.63 | g | 1.75 | d | 1.58 | e | 0.17 | 0.10 | 0.12 | b | 0.49 | 0.77 | b | 1.91 | 9.56 | i | 0.72 | f | 6.89 | |||||
| 1985 | 0.17 | d | 2.40 | d | 1.89 | d | 0.11 | 0.75 | a | 0.33 | 1.18 | a | 0.39 | a | 1.17 | b | 1.88 | d | 2.49 | j | 1.75 | c | 12.02 | |||
| 1986 | 3.74 | h | 8.16 | g | 2.12 | f | 0.95 | 0.85 | b | 0.55 | c | 0.00 | 0.00 | 2.07 | d | 1.24 | d | 0.89 | e | 1.68 | k | 6.55 | ||||
| 1987 | 3.60 | g | 2.97 | f | 1.77 | f | 0.63 | 0.51 | e | 0.05 | b | 0.55 | b | 0.00 | 0.00 | 0.33 | b | 1.54 | h | 5.91 | d | 7.98 | ||||
| 1988 | 3.69 | j | 0.21 | b | 0.28 | b | 0.94 | e | 0.99 | i | 1.21 | b | 0.00 | 0.92 | d | 0.00 | 0.14 | 5.98 | j | 1.51 | e | 5.21 | ||||
| 1989 | 1.60 | i | 0.45 | e | 4.97 | h | 0.85 | d | 1.31 | c | 0.34 | b | 0.00 | 1.63 | 2.28 | b | 1.77 | b | 0.72 | b | 0.21 | d | 9.56 | |||
| 1990 | 3.97 | i | 1.45 | b | 1.17 | d | 1.09 | f | 2.64 | a | 0.20 | b | 0.42 | a | 0.58 | 0.35 | b | 0.70 | b | 1.32 | f | 0.79 | b | 8.30 | ||
| 1991 | 1.01 | g | 2.25 | a | 3.35 | f | 1.53 | g | 1.16 | d | 0.63 | b | 0.57 | 0.62 | 0.08 | 0.66 | 2.81 | e | 1.55 | 10.33 | ||||||
| 1992 | 1.40 | f | 1.67 | g | 0.89 | e | 1.63 | b | 0.38 | b | 2.35 | c | 0.76 | c | 0.00 | 0.08 | 1.87 | a | 1.31 | f | 5.27 | i | 7.96 | |||
| 1993 | 5.45 | j | 1.92 | d | 2.28 | b | 3.04 | f | 2.47 | c | 1.47 | a | 0.02 | 1.33 | a | 0.37 | 0.52 | e | 0.66 | b | 3.53 | a | 14.57 | |||
| 1994 | 1.38 | g | 1.53 | j | 0.31 | b | 0.48 | b | 1.23 | g | 0.05 | b | 0.00 | 0.00 | 0.08 | 0.06 | b | 5.92 | j | 1.79 | j | 0.98 | ||||
| 1995 | 9.03 | l | 1.29 | e | 6.97 | d | 3.31 | d | 2.06 | c | 1.87 | g | 2.15 | c | 0.00 | 0.00 | 0.03 | 0.42 | b | 8.44 | q | 16.23 | ||||
| 1996 | 7.67 | n | 2.89 | g | 1.55 | d | 2.43 | b | 1.89 | b | 0.24 | 0.30 | b | 0.18 | 0.48 | 1.34 | 3.83 | d | 11.46 | g | 12.24 | |||||
| 1997 | 5.92 | g | 0.74 | g | 0.98 | f | 1.28 | e | 0.49 | e | 1.26 | b | 1.31 | b | 1.10 | a | 0.75 | 1.54 | 2.42 | i | 1.60 | f | 7.73 | |||
| 1998 | 7.66 | i | 5.62 | h | 4.54 | g | 1.53 | d | 3.19 | i | 0.41 | d | 0.17 | 0.00 | 0.65 | b | 1.05 | e | 8.90 | i | 1.36 | f | 3.81 | |||
| 1999 | 4.70 | f | 7.80 | h | 1.01 | d | 0.19 | d | 0.07 | b | 0.01 | 0.00 | 0.46 | d | 0.00 | 1.10 | 2.77 | j | 1.20 | d | 4.04 | |||||
| 2000 | 6.94 | i | 4.38 | i | 1.40 | f | 2.39 | d | 0.35 | g | 0.41 | 0.11 | b | 0.22 | b | 0.16 | c | 1.51 | g | 0.75 | b | 1.06 | d | 5.10 | ||
| 2001 | 0.98 | d | 0.58 | g | 0.97 | e | 0.62 | d | 0.37 | 0.14 | 0.93 | 0.00 | 0.50 | 0.28 | 5.30 | g | 4.96 | k | 4.79 | |||||||
| 2002 | 3.22 | j | 1.57 | e | 0.57 | f | 1.77 | b | 0.29 | b | 0.19 | b | 0.38 | d | 0.01 | 0.23 | b | 0.00 | 3.63 | c | 12.89 | g | 8.07 | |||
| 2003 | 3.65 | i | 0.82 | e | 3.23 | f | 2.26 | h | 0.21 | d | 0.02 | 1.49 | 0.66 | b | 0.06 | 0.00 | 0.84 | f | 5.24 | j | 3.26 | |||||
| 2004 | 3.15 | h | 4.44 | h | 1.44 | b | 0.59 | b | 0.58 | d | 0.16 | 1.29 | b | 0.44 | b | 0.00 | 3.03 | g | 1.15 | e | 5.35 | e | 11.00 | |||
| 2005 | 2.19 | i | 0.65 | g | 2.03 | d | 1.51 | h | 2.99 | h | 0.38 | b | 0.09 | b | 0.00 | 0.07 | b | 0.42 | i | 5.67 | h | 10.89 | h | 2.57 | ||
| 2006 | 9.41 | k | 2.13 | d | 1.76 | f | 1.73 | h | 0.60 | e | 0.30 | d | 0.00 | a | 0.20 | b | 0.00 | c | 0.08 | 3.23 | j | 5.42 | e | 8.73 | ||
| 2007 | 1.44 | d | 4.67 | d | 0.50 | 0.69 | f | 0.59 | 0.07 | 0.56 | b | 0.06 | 0.00 | 3.40 | g | 0.85 | e | 2.91 | j | 8.74 | ||||||
| 2008 | 5.95 | i | 2.41 | g | 0.51 | d | 0.56 | 1.65 | c | 0.02 | b | 0.00 | 0.10 | 0.00 | 0.81 | b | 1.98 | g | 1.62 | h | 3.65 | |||||
| 2009 | 0.86 | c | 3.20 | b | 1.30 | i | 0.23 | 1.60 | b | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 5.89 | ||
| 2010 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | |
| 2011 | 0.78 | p | 1.25 | p | 3.86 | k | 0.29 | m | 1.74 | l | 1.60 | i | 0.36 | m | 0.00 | k | 0.02 | m | 1.15 | m | 1.10 | l | 0.56 | l | 0.00 | |
| 2012 | 1.50 | q | 1.16 | p | 3.30 | m | 0.90 | m | 0.13 | l | 0.00 | m | 0.00 | m | 0.00 | m | 0.00 | o | 0.73 | i | 4.30 | d | 7.66 | c | 11.96 | |
| 2013 | 4.38 | d | 0.55 | i | 0.77 | n | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 4.38 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 3.87 | 2.60 | 1.95 | 1.07 | 0.91 | 0.64 | 0.40 | 0.44 | 0.52 | 1.33 | 2.80 | 4.06 | 22.15 | |||||||||||||
| S.D. | 2.54 | 1.77 | 1.54 | 0.84 | 0.90 | 0.78 | 0.51 | 0.66 | 0.65 | 1.38 | 2.04 | 2.89 | 4.69 | |||||||||||||
| SKEW | 0.81 | 1.13 | 1.41 | 1.37 | 1.65 | 2.44 | 1.44 | 2.51 | 1.52 | 2.02 | 0.75 | 0.68 | -0.12 | |||||||||||||
| MAX | 11.01 | 7.60 | 6.97 | 3.92 | 4.05 | 4.44 | 2.15 | 3.61 | 2.47 | 7.41 | 8.15 | 11.90 | 35.07 | |||||||||||||
| MIN | 0.17 | 0.21 | 0.01 | 0.04 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.21 | 10.66 | |||||||||||||
| NO YRS | 50 | 57 | 60 | 65 | 67 | 70 | 72 | 73 | 72 | 67 | 57 | 59 | 40 | |||||||||||||