| YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
| 1931 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 0.13 | 0.30 | 0.28 | 0.35 | 0.35 | |||||
| 1932 | 0.30 | 0.05 | 0.65 | 0.50 | 0.80 | 0.55 | 0.50 | 0.00 | 0.00 | 0.38 | 0.30 | 0.35 | 0.80 | |||||||||||||
| 1933 | 0.45 | 0.75 | 0.45 | 0.48 | 0.35 | 0.10 | 0.00 | 0.15 | 0.60 | 9999.00 | z | 1.00 | 0.40 | 1.00 | ||||||||||||
| 1934 | 0.75 | 0.40 | 0.25 | 0.42 | 0.20 | 0.65 | 0.20 | 9999.00 | z | 0.35 | 0.55 | 0.38 | 0.45 | 0.75 | ||||||||||||
| 1935 | 1.70 | 0.31 | 0.50 | 0.40 | 1.20 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 0.10 | 0.30 | 0.40 | 1.70 | |||||||||
| 1936 | 0.45 | 0.40 | 0.50 | 0.48 | 0.16 | 0.76 | 9999.00 | z | 0.14 | 9999.00 | z | 9999.00 | z | 0.00 | 0.64 | 0.76 | ||||||||||
| 1937 | 0.35 | 0.37 | 0.43 | 9999.00 | z | 9999.00 | z | 0.20 | 0.41 | 0.00 | 0.15 | 0.52 | 0.90 | 0.92 | 0.92 | |||||||||||
| 1938 | 0.50 | 0.25 | 0.55 | 0.85 | 9999.00 | z | 9999.00 | z | 0.60 | 0.17 | 0.23 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 0.85 | ||||||||
| 1939 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1940 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1941 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1942 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1943 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1944 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1945 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1946 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1947 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1948 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1949 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1950 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1951 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | |
| 1952 | 9999.00 | z | 9999.00 | z | 0.28 | b | 0.33 | 0.17 | 0.30 | 0.06 | 0.60 | 0.17 | 0.00 | 0.35 | 0.13 | d | 0.60 | |||||||||
| 1953 | 0.37 | c | 0.60 | 0.50 | b | 0.25 | 1.20 | 0.65 | 0.00 | 0.03 | 0.00 | 9999.00 | z | 0.33 | 0.45 | 1.20 | ||||||||||
| 1954 | 0.25 | f | 9999.00 | z | 0.26 | 0.02 | 0.10 | 0.30 | 0.00 | 0.04 | 0.00 | 0.50 | 0.05 | 9999.00 | z | 0.50 | ||||||||||
| 1955 | 9999.00 | z | 9999.00 | z | 0.25 | 0.60 | 0.70 | a | 0.80 | 0.10 | 0.00 | 0.25 | 0.40 | 0.60 | 1.90 | 1.90 | ||||||||||
| 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 | |||||||||||
| 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 | ||||||||||||
| 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 | ||||||||||||
| 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 | A | 0.50 | 0.19 | 0.38 | 0.00 | 0.70 | 0.23 | 0.00 | 0.13 | 0.65 | A | 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 | |||||||||||
| 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 | ||||||||||||
| 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 | A | 0.51 | 0.69 | 0.73 | 0.04 | 0.28 | 0.00 | 0.14 | 0.42 | 0.70 | 0.73 | ||||||||||||
| 1965 | 0.72 | 0.03 | 0.03 | 9999.00 | z | 0.40 | 0.20 | 0.10 | 0.25 | 0.10 | 0.00 | 0.55 | a | 0.15 | b | 0.72 | ||||||||||
| 1966 | 0.10 | 0.25 | 0.04 | 0.00 | 0.31 | 0.25 | 0.00 | 0.00 | 0.05 | 0.25 | A | 0.75 | 0.32 | 0.75 | ||||||||||||
| 1967 | 1.12 | 0.30 | A | 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 | ||||||||||||
| 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 | ||||||||||||
| 1970 | 0.65 | 0.00 | 0.54 | 0.75 | A | 0.38 | 0.30 | 0.60 | 0.00 | 0.55 | 0.31 | 0.58 | 0.38 | 0.65 | ||||||||||||
| 1971 | 0.67 | A | 0.40 | 0.65 | A | 0.20 | 0.20 | 0.92 | 0.00 | 0.00 | 0.95 | A | 0.36 | 0.70 | 0.35 | 0.92 | ||||||||||
| 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 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 0.52 | 9999.00 | z | 0.73 | ||||||
| 1975 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 9999.00 | z | 0.25 | 0.89 | A | 0.59 | 0.18 | 0.10 | 1.30 | 0.25 | 0.45 | 1.30 | ||||||||
| 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 | A | 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 | ||||||||||||
| 1979 | 9999.00 | z | 0.31 | 0.60 | 0.62 | 0.35 | 0.62 | 0.05 | 0.90 | 0.00 | 1.02 | 0.45 | 0.20 | 1.02 | ||||||||||||
| 1980 | 0.50 | 0.58 | 9999.00 | z | 0.34 | 0.52 | 0.63 | 0.13 | 0.00 | 0.45 | 0.63 | 0.40 | 0.61 | 0.63 | ||||||||||||
| 1981 | 0.57 | 0.41 | 1.12 | 1.60 | A | 0.49 | 0.55 | 0.24 | 0.18 | 0.19 | 0.90 | 1.02 | 1.75 | A | 1.12 | |||||||||||
| 1982 | 1.00 | a | 0.37 | 0.30 | 0.37 | 0.16 | v | 1.05 | 0.95 | 0.11 | 0.76 | A | 1.19 | 0.76 | c | 2.16 | 2.16 | |||||||||
| 1983 | 1.30 | A | 0.62 | g | 0.63 | f | 1.05 | A | 1.02 | 0.90 | a | 0.60 | 0.98 | 0.35 | 0.32 | 0.48 | a | 0.76 | A | 1.02 | ||||||
| 1984 | 0.24 | A | 0.65 | 0.54 | a | 0.53 | A | 0.70 | 0.48 | 0.66 | 0.25 | 0.20 | 0.50 | 9999.00 | z | 0.18 | 0.70 | |||||||||
| 1985 | 0.10 | 0.23 | 0.28 | A | 0.28 | 0.45 | 0.21 | 1.02 | A | 0.04 | 0.40 | A | 0.50 | 0.53 | d | 0.60 | 0.60 | |||||||||
| 1986 | 0.53 | 1.73 | a | 0.95 | a | 0.48 | b | 0.68 | 0.02 | 0.00 | 0.15 | 1.21 | A | 0.11 | A | 9999.00 | z | 9999.00 | z | 1.73 | ||||||
| 1987 | 0.40 | 0.63 | 0.52 | a | 0.25 | a | 1.38 | A | 0.37 | A | 0.30 | A | 9999.00 | z | 9999.00 | z | 0.03 | 0.34 | A | 0.36 | c | 0.63 | ||||
| 1988 | 0.30 | 0.06 | 0.31 | 0.65 | A | 0.29 | 0.60 | A | 0.05 | 0.00 | 0.25 | 0.00 | 0.68 | A | 0.48 | A | 0.31 | |||||||||
| 1989 | 0.50 | a | 0.63 | 1.17 | b | 0.42 | 0.32 | 0.00 | b | 0.00 | 0.36 | 0.65 | a | 0.37 | c | 0.45 | A | 0.00 | 1.17 | |||||||
| 1990 | 0.29 | 0.42 | 0.08 | 0.83 | c | 0.75 | 0.35 | a | 9999.00 | z | 0.73 | 0.12 | 0.28 | 0.50 | A | 0.28 | a | 0.83 | ||||||||
| 1991 | 0.23 | 0.39 | 0.52 | 0.46 | b | 1.31 | A | 0.97 | A | 0.00 | 9999.00 | z | 0.28 | 0.89 | 0.38 | A | 0.49 | 0.89 | ||||||||
| 1992 | 0.24 | A | 0.31 | a | 0.25 | 0.28 | 0.22 | 1.23 | 0.10 | 0.00 | 9999.00 | z | 0.54 | A | 0.26 | A | 0.53 | c | 1.23 | |||||||
| 1993 | 0.40 | c | 0.30 | A | 1.05 | A | 0.57 | b | 0.25 | c | 0.86 | A | 0.55 | 0.26 | a | 0.00 | 0.50 | A | 0.16 | b | 0.36 | 0.57 | ||||
| 1994 | 0.33 | a | 0.53 | A | 0.20 | 0.28 | 0.25 | 0.35 | 0.00 | 0.00 | 0.05 | a | 0.50 | A | 0.45 | A | 0.52 | A | 0.35 | |||||||
| 1995 | 0.81 | A | 0.00 | p | 0.82 | 0.45 | a | 0.52 | a | 0.50 | 0.75 | 0.17 | 0.11 | A | 0.45 | g | 0.81 | c | 1.07 | A | 0.82 | |||||
| 1996 | 0.48 | f | 0.67 | 0.64 | a | 0.55 | c | 0.68 | a | 0.39 | 0.00 | 0.28 | 0.10 | 0.31 | 0.67 | A | 1.70 | A | 0.68 | |||||||
| 1997 | 0.80 | b | 0.15 | 0.20 | 0.58 | 0.71 | 0.66 | A | 0.19 | A | 0.25 | A | 0.15 | 0.25 | 0.30 | A | 0.35 | d | 0.80 | |||||||
| 1998 | 0.40 | 0.39 | A | 0.42 | 0.40 | 1.47 | 9999.00 | z | 0.30 | A | 0.00 | 0.81 | A | 0.12 | 0.52 | d | 0.52 | d | 1.47 | |||||||
| 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 | e | 1.74 | ||||||||
| 2000 | 3.50 | 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 | 3.50 | |||||||||
| 2001 | 9999.00 | z | 0.15 | a | 0.54 | a | 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 | 0.70 | |||
| 2002 | 0.61 | d | 0.36 | a | 0.45 | b | 0.60 | g | 0.34 | b | 0.25 | 0.30 | a | 0.00 | 0.22 | a | 0.20 | 0.44 | 1.40 | i | 1.40 | |||||
| 2003 | 0.61 | a | 0.20 | b | 0.60 | 1.10 | 1.27 | A | 0.07 | 0.10 | 0.47 | A | 0.00 | 0.00 | 9999.00 | z | 9999.00 | z | 1.10 | |||||||
| 2004 | 9999.00 | z | 0.45 | o | 0.40 | 0.35 | 0.97 | A | 0.17 | A | 0.14 | A | 0.85 | b | 0.40 | 9999.00 | z | 9999.00 | z | 9999.00 | z | 0.85 | ||||
| Period of Record Statistics | ||||||||||||||||||||||||||
| MEAN | 0.60 | 0.38 | 0.47 | 0.49 | 0.52 | 0.49 | 0.24 | 0.22 | 0.25 | 0.40 | 0.45 | 0.53 | 0.93 | |||||||||||||
| S.D. | 0.52 | 0.27 | 0.28 | 0.32 | 0.34 | 0.34 | 0.27 | 0.29 | 0.25 | 0.31 | 0.23 | 0.44 | 0.26 | |||||||||||||
| SKEW | 3.67 | 2.41 | 0.73 | 1.48 | 1.21 | 0.71 | 1.06 | 1.69 | 1.04 | 1.10 | 0.41 | 2.32 | 1.13 | |||||||||||||
| MAX | 3.50 | 1.73 | 1.17 | 1.60 | 1.47 | 1.57 | 1.02 | 1.19 | 0.95 | 1.30 | 1.02 | 2.16 | 1.57 | |||||||||||||
| 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 | |||||||||||||
| NO YRS | 51 | 53 | 57 | 56 | 55 | 55 | 56 | 55 | 54 | 54 | 53 | 52 | 22 | |||||||||||||