ST HELENS RFD, OREGON

Monthly Total Precipitation (inches)

(357466)

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
1976 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3.84 1.12 1.28 0.81 1.96 9.01
1977 1.41 2.65 5.34 1.11 4.98 0.86 0.81 3.45 4.59 2.84 6.63 10.20 44.87
1978 6.22 0.00 z 2.32 4.68 3.33 1.94 1.07 2.26 3.25 0.79 4.41 3.41 33.68
1979 1.12 8.06 2.68 3.60 2.41 1.29 0.40 1.62 0.00 z 0.00 z 3.93 7.69 32.80
1980 8.62 4.99 3.38 3.69 2.10 1.87 0.30 0.36 0.98 1.58 6.67 b 7.82 42.36
1981 2.44 4.19 3.85 3.26 a 3.36 3.76 0.27 0.01 2.98 5.26 6.24 a 8.96 44.58
1982 8.26 6.97 3.61 4.09 0.65 1.88 0.93 1.34 3.34 4.99 5.72 11.79 a 53.57
1983 2.51 h 9.98 10.28 c 3.14 1.97 3.22 3.65 2.41 1.39 1.31 a 12.58 c 5.55 55.48
1984 4.04 c 5.63 4.37 c 4.73 5.24 c 4.01 0.05 0.37 2.40 b 4.26 a 11.14 4.29 50.53
1985 0.41 3.17 4.80 1.30 1.48 2.34 a 0.34 1.47 a 2.18 b 3.69 3.30 d 2.25 26.73
1986 7.78 5.69 a 2.51 a 2.72 e 3.53 0.41 0.98 0.25 0.00 z 2.76 a 7.03 4.91 a 38.57
1987 8.29 4.44 c 7.43 b 1.80 3.07 0.18 0.97 0.46 0.23 0.25 2.94 10.35 40.41
1988 6.27 2.37 a 5.00 3.17 2.64 2.35 a 0.75 a 0.89 2.22 a 0.51 a 10.18 d 3.34 39.69
1989 4.99 a 3.25 6.38 b 3.04 a 2.26 1.52 a 1.24 a 1.92 0.39 2.75 3.69 b 2.77 a 34.20
1990 10.80 a 6.27 b 2.66 2.32 a 3.06 a 1.53 0.46 a 0.83 0.37 a 7.76 5.61 3.42 d 45.09
1991 2.71 4.09 5.09 a 7.49 a 2.24 a 1.88 0.31 1.51 0.32 2.09 b 8.26 e 5.36 b 41.35
1992 5.82 a 5.85 g 1.90 4.85 b 0.04 1.44 b 0.85 a 0.46 a 1.61 c 3.17 a 5.96 d 7.07 b 33.17
1993 4.99 c 0.66 a 4.44 d 7.83 f 4.58 b 3.23 b 2.57 0.10 0.03 1.48 4.40 d 6.24 c 32.72
1994 3.36 e 5.83 d 2.52 2.85 a 0.84 a 2.18 a 0.05 0.18 2.04 4.33 b 6.92 b 10.86 b 41.96
1995 6.33 a 3.67 5.89 c 4.07 b 2.91 2.53 1.41 0.96 e 2.70 4.94 a 8.69 e 9.83 b 53.93
1996 7.19 b 9.73 a 2.24 6.34 4.59 a 1.32 c 0.72 0.66 2.74 5.36 a 9.77 a 13.73 a 64.39
1997 10.68 4.64 a 8.35 4.98 a 2.62 3.60 d 0.88 2.38 b 3.23 a 7.00 c 7.28 b 4.04 a 59.68
1998 8.53 6.08 b 4.68 b 1.29 a 5.26 c 1.69 0.43 0.03 1.22 4.17 b 13.29 f 8.37 d 41.75
1999 8.79 c 10.87 4.79 2.06 3.73 2.08 a 0.80 0.55 c 0.21 b 2.78 a 9.79 c 5.47 51.92
2000 6.95 5.68 c 4.16 a 3.16 3.68 2.76 0.20 0.42 a 2.44 3.49 2.59 a 4.55 b 40.08
2001 2.50 a 2.27 3.12 a 2.86 b 0.71 e 2.07 0.82 0.88 0.98 3.21 d 8.19 8.07 f 27.61
2002 8.01 h 4.21 e 6.38 i 2.68 1.05 a 1.39 0.04 0.18 0.32 a 0.78 3.52 a 11.85 a 26.02
2003 9.31 b 2.29 a 5.25 e 6.51 0.99 0.43 0.09 0.85 a 1.79 3.15 a 1.65 a 7.87 d 40.18
2004 5.74 k 4.82 k 2.68 2.22 a 3.44 d 1.83 b 0.00 3.58 2.33 b 3.89 c 1.23 b 3.78 d 24.98
2005 3.77 h 1.03 4.00 4.28 g 4.64 4.72 a 0.85 0.54 b 1.76 b 5.07 i 7.82 8.67 a 34.03
2006 15.03 d 5.02 b 6.58 b 2.23 0.00 z 0.92 c 0.30 0.30 2.26 a 1.69 15.03 c 8.13 57.49
2007 5.00 f 5.58 a 3.04 c 2.53 d 1.37 a 0.78 a 0.37 0.78 1.32 2.34 3.16 12.73 c 34.00
2008 5.83 d 4.06 b 3.82 a 2.54 d 0.59 1.61 a 0.10 b 1.78 e 0.00 2.29 7.58 b 0.10 d 30.30
2009 5.81 1.67 4.98 a 2.39 4.55 0.28 0.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 19.68
2010 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3.20 a 0.61 0.00 1.81 4.12 7.18 9.81 26.73
2011 6.58 5.50 c 8.91 5.12 a 3.06 c 0.89 b 1.41 b 0.01 f 0.47 f 3.60 c 8.54 b 2.20 e 45.81
2012 6.95 d 3.64 e 9.06 d 3.27 d 4.75 e 3.17 i 0.08 h 0.00 i 0.02 k 5.94 g 9.33 b 9.25 d 46.25
2013 3.36 e 1.80 f 2.40 e 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 5.76
Period of Record Statistics
MEAN 6.17 4.82 4.64 3.40 2.82 1.94 0.72 1.11 1.70 3.15 6.51 6.82 44.52
S.D. 3.20 2.45 2.13 1.52 1.50 1.10 0.73 1.06 1.15 1.78 3.26 3.48 9.46
SKEW 0.37 0.68 0.98 0.88 -0.06 0.55 2.25 1.19 0.30 0.54 0.35 0.10 0.24
MAX 15.03 10.87 10.28 7.49 5.26 4.72 3.65 3.84 4.59 7.76 15.03 13.73 64.39
MIN 0.41 0.66 1.90 1.11 0.04 0.18 0.00 0.00 0.00 0.25 0.81 0.10 26.73
NO YRS 31 32 35 33 34 35 35 34 32 33 35 35 19