| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1937 | 1.58 | 1.40 | 2.08 | u | 0.08 | 0.22 | 3.01 | 2.50 | 0.15 | 0.38 | 1.44 | 1.50 | 1.55 | 13.81 | ||||||||||||
| 1938 | 0.86 | 1.14 | 0.86 | 0.86 | 0.53 | 1.26 | 0.24 | 0.00 | 0.32 | 1.27 | y | 1.17 | 0.76 | z | 7.24 | |||||||||||
| 1939 | 1.15 | 0.77 | 0.85 | 0.15 | 0.39 | 0.36 | 0.18 | 0.34 | 0.89 | 0.48 | 0.11 | 1.68 | 7.35 | |||||||||||||
| 1940 | 0.77 | 1.68 | 1.78 | 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 | 4.23 | ||||
| 1941 | 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 | |
| 1942 | 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 | |
| 1943 | 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 | |
| 1944 | 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 | |
| 1945 | 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 | |
| 1946 | 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 | |
| 1947 | 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 | |
| 1948 | 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 | |
| 1949 | 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 | |
| 1950 | 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 | |
| 1951 | 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 | |
| 1952 | 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 | |
| 1953 | 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 | |
| 1954 | 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 | |
| 1955 | 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 | |
| 1956 | 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 | |
| 1957 | 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 | |
| 1958 | 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 | r | 0.09 | 1.37 | 1.84 | 3.30 | ||||
| 1959 | 1.76 | 0.54 | 1.74 | 0.23 | 0.88 | 0.92 | 0.10 | 0.08 | 1.75 | 0.82 | 0.40 | 0.44 | 9.66 | |||||||||||||
| 1960 | 0.91 | 0.85 | 2.31 | 0.94 | a | 2.26 | 0.12 | 0.12 | 0.25 | 0.15 | 0.43 | 1.53 | 1.14 | 11.01 | ||||||||||||
| 1961 | 0.47 | 2.39 | 1.71 | 0.59 | 1.92 | 0.96 | 0.30 | 0.15 | 0.43 | 0.66 | 1.83 | 1.18 | 12.59 | |||||||||||||
| 1962 | 0.78 | 1.24 | 1.19 | 0.75 | 2.23 | 0.00 | 0.07 | 0.62 | 0.41 | 2.10 | 2.42 | 1.13 | 12.94 | |||||||||||||
| 1963 | 0.37 | 2.50 | 0.83 | 3.09 | 0.72 | 0.75 | 0.90 | 0.18 | 1.04 | 0.46 | 1.87 | 1.98 | 14.69 | |||||||||||||
| 1964 | 1.76 | 0.25 | 0.69 | 0.33 | 0.23 | 2.34 | 1.45 | 0.11 | 0.23 | 1.03 | 2.05 | 5.51 | 15.98 | |||||||||||||
| 1965 | 3.31 | 0.17 | 0.81 | 1.60 | 0.57 | 1.61 | 0.75 | 2.24 | 0.17 | 0.14 | 1.75 | 0.34 | 13.46 | |||||||||||||
| 1966 | 1.83 | 1.12 | 0.94 | 0.18 | 0.77 | 0.59 | 0.86 | 0.05 | 1.70 | 1.18 | 2.97 | 2.14 | 14.33 | |||||||||||||
| 1967 | 1.40 | 2.37 | 0.83 | 2.27 | 1.13 | 0.62 | 0.00 | 0.05 | 0.24 | 0.97 | 0.81 | 0.72 | 11.41 | |||||||||||||
| 1968 | 0.95 | 1.53 | 0.46 | 0.52 | 1.09 | 0.91 | 0.16 | 2.81 | 0.45 | 1.04 | 4.10 | 3.01 | 17.03 | |||||||||||||
| 1969 | 1.84 | 1.17 | 0.94 | 1.99 | 1.65 | 4.33 | 0.47 | 0.00 | 0.76 | 1.23 | 0.30 | 1.62 | 16.30 | |||||||||||||
| 1970 | 3.24 | 1.40 | 1.39 | 0.71 | 0.87 | 1.16 | 1.50 | 0.00 | 0.76 | 1.66 | 2.56 | 1.32 | 16.57 | |||||||||||||
| 1971 | 2.04 | 0.87 | 1.71 | 1.15 | 1.62 | 0.76 | 0.75 | 0.20 | 0.67 | 2.22 | 2.92 | 3.38 | 18.29 | |||||||||||||
| 1972 | 1.50 | 0.92 | 1.91 | 0.75 | 1.45 | 1.14 | 0.10 | 0.10 | 0.58 | 0.99 | 1.30 | 2.55 | 13.29 | |||||||||||||
| 1973 | 0.83 | 0.85 | 1.02 | 0.71 | 0.70 | 0.18 | 0.00 | 0.15 | 1.72 | 1.30 | 3.72 | 3.13 | 14.31 | |||||||||||||
| 1974 | 0.92 | 1.63 | 1.27 | 1.85 | 0.52 | 0.42 | 0.97 | 0.04 | 0.00 | 0.25 | 0.90 | 2.30 | 11.07 | |||||||||||||
| 1975 | 1.71 | 1.55 | 1.55 | 0.82 | 0.41 | 0.29 | 0.96 | 1.19 | 0.00 | 1.98 | 0.95 | 2.00 | 13.41 | |||||||||||||
| 1976 | 2.38 | 1.71 | 1.54 | 1.30 | 0.71 | 0.44 | 0.00 | 4.73 | 0.69 | 0.45 | 0.61 | 0.46 | 15.02 | |||||||||||||
| 1977 | 0.58 | 0.92 | 1.37 | 0.37 | 2.41 | 0.48 | 0.20 | 0.33 | 0.60 | 0.10 | 1.96 | 2.78 | 12.10 | |||||||||||||
| 1978 | 1.15 | 0.00 | z | 1.44 | 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 | 2.59 | |||
| 1979 | 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 | |
| 1980 | 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 | |
| 1981 | 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 | |
| 1982 | 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 | |
| 1983 | 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 | |
| 1984 | 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 | |
| 1985 | 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 | |
| 1986 | 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 | |
| 1987 | 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 | |
| 1988 | 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 | |
| 1989 | 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 | |
| 1990 | 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 | |
| 1991 | 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 | |
| 1992 | 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 | |
| 1993 | 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 | |
| 1994 | 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 | |
| 1995 | 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 | |
| 1996 | 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 | |
| 1997 | 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 | |
| 1998 | 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 | |
| 1999 | 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 | |
| 2000 | 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 | |
| 2001 | 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 | |
| 2002 | 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 | |
| 2003 | 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 | |
| 2004 | 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 | |
| 2005 | 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 | |
| 2006 | 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 | |
| 2007 | 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 | |
| 2008 | 0.00 | z | 0.00 | z | 0.00 | z | 0.33 | 1.04 | 0.50 | 0.00 | z | 0.00 | z | 0.00 | z | 0.00 | z | 1.18 | 1.70 | b | 4.75 | |||||
| 2009 | 1.03 | 0.72 | 1.06 | 1.43 | 1.12 | 0.12 | 0.00 | z | 1.08 | 0.12 | 1.19 | 0.76 | 1.20 | 9.83 | ||||||||||||
| 2010 | 1.73 | 0.74 | 0.21 | 1.22 | 1.56 | 2.17 | 0.17 | 0.03 | 0.94 | 1.26 | 1.61 | 1.71 | 13.35 | |||||||||||||
| 2011 | 1.23 | z | 0.75 | u | 2.05 | l | 1.66 | l | 2.33 | b | 1.15 | o | 0.08 | z | 0.00 | z | 0.04 | z | 0.77 | y | 0.31 | z | 1.25 | z | 2.33 | |
| 2012 | 2.33 | v | 0.20 | z | 0.80 | y | 1.05 | u | 0.46 | z | 2.08 | t | 0.22 | z | 0.00 | z | 0.00 | z | 0.85 | x | 0.89 | y | 1.67 | x | 0.00 | |
| 2013 | 0.90 | z | 0.45 | z | 0.40 | 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 | |
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 1.42 | 1.22 | 1.22 | 0.97 | 1.13 | 1.02 | 0.55 | 0.62 | 0.62 | 0.98 | 1.64 | 1.87 | 13.53 | |||||||||||||
| S.D. | 0.75 | 0.61 | 0.50 | 0.74 | 0.68 | 1.01 | 0.63 | 1.13 | 0.51 | 0.62 | 1.01 | 1.12 | 2.61 | |||||||||||||
| SKEW | 0.98 | 0.51 | 0.13 | 1.12 | 0.57 | 1.80 | 1.52 | 2.51 | 1.02 | 0.35 | 0.73 | 1.31 | -0.34 | |||||||||||||
| MAX | 3.31 | 2.50 | 2.31 | 3.09 | 2.41 | 4.33 | 2.50 | 4.73 | 1.75 | 2.22 | 4.10 | 5.51 | 18.29 | |||||||||||||
| MIN | 0.37 | 0.17 | 0.21 | 0.08 | 0.22 | 0.00 | 0.00 | 0.00 | 0.00 | 0.09 | 0.11 | 0.34 | 7.35 | |||||||||||||
| NO YRS | 26 | 25 | 25 | 25 | 26 | 25 | 23 | 24 | 24 | 24 | 26 | 25 | 21 | |||||||||||||