POTOMAC FILTER PLANT, MARYLAND

Period of Record General Climate Summary - Precipitation

From Year=1962 To Year=2011
Station:(187272) POTOMAC FILTER PLANT
Averages Daily Extremes
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 2.68 7.08 78 0.35 81 2.06 07/1996 8 6 2 0 3.3 20.0 87
February 2.52 6.61 103 0.21 68 2.00 04/1998 7 5 2 1 2.6 17.0 67
March 3.23 7.12 93 0.14 106 2.25 04/1993 9 6 2 1 0.6 6.2 76
April 3.24 7.69 83 0.32 85 2.80 20/2008 9 6 2 1 0.0 2.0 64
May 3.79 8.97 109 0.70 107 2.90 26/2009 10 7 3 1 0.0 0.0 63
June 3.93 12.81 72 1.03 88 7.96 22/1972 9 7 3 1 0.0 0.0 62
July 3.53 10.74 105 0.34 97 3.60 15/2005 9 6 3 1 0.0 0.0 62
August 3.49 10.33 79 0.14 62 3.80 21/1963 8 5 2 1 0.0 0.0 62
September 4.12 11.11 66 0.34 67 6.82 07/2008 8 6 3 1 0.0 0.0 62
October 3.10 8.91 105 0.00 63 3.70 23/1990 8 5 2 1 0.0 0.0 62
November 3.28 7.44 106 0.24 81 3.00 25/1971 9 6 2 1 0.4 9.5 67
December 3.00 6.29 73 0.37 65 2.56 01/1974 8 6 2 1 1.0 12.5 73
Annual 39.91 68.91 103 28.64 91 7.96 19720622 102 72 27 10 7.9 30.0 64
Winter 8.21 15.02 79 3.89 77 2.56 19741201 23 17 6 2 7.0 29.0 87
Spring 10.27 17.78 108 4.79 69 2.90 20090526 28 20 7 2 0.6 7.0 64
Summer 10.94 21.99 79 5.64 66 7.96 19720622 25 18 7 3 0.0 0.0 62
Fall 10.50 18.68 79 4.38 98 6.82 20080907 25 16 7 3 0.4 9.5 67
Table updated on May 22,
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.


Southeast Regional Climate Center, SERCC Webmaster