MERWIN DAM, WASHINGTON

Monthly Total Precipitation (inches)

(455305)

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
MAXIMUM ALLOWABLE NUMBER OF MISSING DAYS : 5
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1971 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 12.90 21.74 34.64
1972 17.04 10.87 10.91 8.60 2.30 1.82 1.34 1.27 5.80 1.47 9.60 14.66 85.68
1973 6.90 3.21 4.98 2.80 3.64 4.07 0.10 1.27 5.77 6.53 22.04 18.09 79.40
1974 17.73 10.74 11.11 7.94 5.89 2.58 4.49 0.24 0.61 2.48 11.96 16.68 92.45
1975 17.58 9.26 8.07 4.20 3.98 2.83 0.43 5.42 0.15 11.94 11.05 17.31 92.22
1976 12.72 10.06 7.76 4.99 4.36 1.54 2.06 5.75 1.83 3.29 2.42 4.24 61.02
1977 2.48 6.10 11.02 2.19 6.95 2.12 0.72 5.13 7.30 4.35 12.39 19.35 80.10
1978 7.68 6.61 3.62 7.45 5.94 3.27 1.08 4.02 4.13 2.20 7.32 8.66 61.98
1979 3.19 14.42 4.50 5.29 2.65 1.15 2.04 2.44 5.35 8.41 5.59 12.77 67.80
1980 10.45 6.32 6.48 5.73 2.26 2.93 0.54 1.18 2.59 1.80 11.50 14.67 66.45
1981 2.42 9.43 5.01 7.32 4.75 7.26 0.50 0.19 3.09 6.98 7.40 14.50 68.85
1982 16.87 11.03 5.73 6.83 1.22 1.71 1.32 1.19 4.12 7.39 8.65 14.50 80.56
1983 14.53 11.80 9.66 4.08 2.70 5.21 4.91 2.70 3.73 4.04 17.18 7.19 87.73
1984 8.33 8.84 8.24 7.27 6.65 5.72 0.00 0.19 3.66 7.91 15.22 7.67 a 79.70
1985 0.38 6.48 8.00 3.05 2.36 4.35 0.69 1.59 5.17 7.68 10.13 3.12 53.00
1986 9.25 9.62 5.19 5.59 4.47 0.83 2.12 0.52 6.98 3.62 12.46 6.64 67.29
1987 11.09 7.42 10.90 3.29 4.66 0.86 1.26 0.72 0.63 0.11 6.25 11.48 58.67
1988 8.45 5.75 9.92 5.60 6.38 2.91 1.44 0.75 2.91 1.60 17.00 7.95 70.66
1989 10.61 5.29 12.00 4.02 3.54 2.28 1.27 4.00 0.74 5.12 8.95 4.71 62.53
1990 17.72 14.92 5.83 5.60 3.73 4.18 0.78 1.79 0.80 11.98 10.45 7.55 85.33
1991 6.52 8.08 9.07 11.46 4.50 2.78 0.21 0.75 0.69 3.62 14.62 9.79 72.09
1992 7.77 5.52 2.46 7.05 0.40 0.79 0.69 0.73 3.35 2.80 10.91 10.19 52.66
1993 5.84 0.83 7.49 11.72 5.43 5.18 3.68 0.44 0.07 2.10 3.79 8.92 55.49
1994 8.00 8.67 5.14 4.88 1.67 3.39 0.12 0.39 2.06 8.97 15.68 15.47 a 74.44
1995 8.34 5.85 6.40 6.05 4.23 3.16 1.76 3.49 5.49 8.49 a 17.85 9.35 a 80.46
1996 12.19 13.15 3.50 9.21 4.54 2.59 1.09 1.01 3.59 11.15 11.55 20.59 94.16
1997 12.15 6.49 12.56 6.66 3.67 6.72 1.24 2.72 5.05 10.26 8.78 6.25 82.55
1998 10.65 7.41 6.59 2.35 6.96 2.59 0.36 0.01 1.88 5.31 15.25 15.32 74.68
1999 11.34 15.74 7.75 1.87 5.65 0.00 z 1.17 1.34 0.21 4.46 14.42 12.49 76.44
2000 10.00 6.20 6.07 3.12 4.94 2.29 0.45 0.65 3.95 5.52 5.15 0.00 z 48.34
2001 4.06 2.78 5.87 5.53 2.15 2.92 1.23 1.95 1.20 7.19 9.71 13.06 57.65
2002 13.88 5.85 8.01 4.05 2.56 2.38 0.20 0.14 2.89 1.07 5.01 12.25 58.29
2003 9.83 5.79 11.01 8.59 2.35 0.85 0.12 0.11 2.07 5.55 8.83 11.74 66.84
2004 11.71 a 8.12 3.74 2.53 5.33 2.68 0.11 5.72 3.51 8.04 4.82 5.92 62.23
2005 6.53 2.32 6.89 7.42 5.84 3.24 1.11 0.57 0.00 z 7.32 9.98 7.52 58.74
2006 17.76 5.25 6.40 4.79 4.27 1.53 0.79 0.46 1.69 4.38 18.91 7.60 73.83
2007 6.54 b 9.24 6.37 3.36 1.81 1.92 0.95 1.18 1.72 a 5.52 6.25 15.46 60.32
2008 10.15 7.74 9.72 5.36 2.34 2.79 0.56 2.19 0.37 3.56 10.65 7.38 e 62.81
2009 11.15 1.78 5.93 6.18 0.00 z 0.77 0.19 1.24 2.18 5.15 8.77 5.13 b 48.47
2010 9.53 5.47 6.85 5.83 a 6.86 5.15 0.62 0.01 5.21 6.50 11.36 0.00 z 63.39
2011 9.76 6.55 11.79 9.04 2.69 1.08 0.93 0.19 2.13 4.80 11.36 5.13 r 60.32
2012 0.00 z 7.68 a 12.29 6.98 b 3.84 4.04 b 0.18 f 0.00 d 0.06 k 7.22 e 8.40 n 11.74 53.79
2013 8.58 d 4.57 d 4.10 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 17.25
Period of Record Statistics
MEAN 9.94 7.60 7.50 5.75 4.01 2.91 1.12 1.60 2.94 5.56 10.83 11.27 71.47
S.D. 4.39 3.39 2.71 2.38 1.72 1.61 1.10 1.67 1.99 2.98 4.36 4.77 11.92
SKEW 0.08 0.43 0.26 0.50 0.02 0.84 2.01 1.30 0.37 0.33 0.36 0.33 0.26
MAX 17.76 15.74 12.56 11.72 6.96 7.26 4.91 5.75 7.30 11.98 22.04 21.74 94.16
MIN 0.38 0.83 2.46 1.87 0.40 0.77 0.00 0.00 0.07 0.11 2.42 3.12 52.66
NO YRS 41 42 42 41 40 40 40 41 39 41 41 39 34