MERWIN DAM, WASHINGTON

Period of Record General Climate Summary - Precipitation

Station:(455305) MERWIN DAM
From Year=1971 To Year=2012
Precipitation Total Snowfall
Mean High Year Low Year 1 Day Max. >=
0.01 in.
>=
0.10 in.
>=
0.50 in.
>=
1.00 in.
Mean High Year
in. in. - in. - in. dd/yyyy
or
yyyymmdd
# Days # Days # Days # Days in. in. -
January 9.98 17.76 2006 0.38 1985 4.90 11/1972 21 17 7 3 1.5 12.8 2004
February 7.68 15.74 1999 0.83 1993 3.12 10/1990 18 14 6 2 1.2 21.0 1990
March 7.58 12.56 1997 2.46 1992 2.78 30/2012 21 16 6 1 0.1 2.0 2006
April 5.75 11.72 1993 1.87 1999 2.97 05/1991 18 13 4 1 0.0 0.8 1976
May 4.01 6.96 1998 0.40 1992 1.92 28/2004 15 10 3 0 0.0 0.0 1972
June 2.91 7.26 1981 0.77 2009 2.50 07/1985 11 7 2 0 0.0 0.0 1972
July 1.12 4.91 1983 0.00 1984 1.50 09/1974 6 3 1 0 0.0 0.0 1972
August 1.60 5.75 1976 0.00 2012 2.04 24/1977 5 3 1 0 0.0 0.0 1972
September 2.94 7.30 1977 0.07 1993 2.59 03/1979 9 6 2 1 0.0 0.0 1972
October 5.52 11.98 1990 0.11 1987 3.05 27/1994 14 10 4 1 0.0 0.0 1972
November 10.83 22.04 1973 2.42 1976 4.45 28/1995 21 17 8 3 0.2 3.5 1977
December 11.26 21.74 1971 3.12 1985 4.98 02/1977 21 17 9 3 0.9 7.5 1971
Annual 71.18 94.16 1996 52.66 1992 4.98 19771202 180 133 53 16 3.9 24.8 1990
Winter 28.91 49.65 1972 12.82 1977 4.98 19771202 60 48 22 8 3.6 22.0 1990
Spring 17.35 25.03 1991 9.91 1992 2.97 19910405 54 39 12 2 0.2 2.0 2006
Summer 5.63 12.82 1983 1.08 2003 2.50 19850607 22 13 4 1 0.0 0.0 1972
Fall 19.29 34.34 1973 5.96 1993 4.45 19951128 44 33 15 5 0.2 3.5 1977
Table updated on Oct 31, 2012
For monthly and annual means, thresholds, and sums:
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered
Seasons are climatological not calendar seasons
Winter = Dec., Jan., and Feb. Spring = Mar., Apr., and May
Summer = Jun., Jul., and Aug. Fall = Sep., Oct., and Nov.


Western Regional Climate Center, wrcc@dri.edu