Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Northwest Climate Region

Precipitation Rankings, October 2017

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
October 2017
1-Month 		3.15"
(80.01mm)		 2.54"
(64.52mm)		 0.61"
(15.49mm)		 89th Driest
Driest since:
 1895
40th Wettest
Wettest since:
 2016
Ties: 1933, 2004
Sep–Oct 2017
2-Month 		4.76"
(120.90mm)		 3.96"
(100.58mm)		 0.80"
(20.32mm)		 94th Driest
Driest since:
 1987
35th Wettest
Wettest since:
 2016
Aug–Oct 2017
3-Month 		5.00"
(127.00mm)		 4.76"
(120.90mm)		 0.24"
(6.10mm)		 77th Driest
Driest since:
 1987
52nd Wettest
Wettest since:
 2016
Ties: 1922
Jul–Oct 2017
4-Month 		5.15"
(130.81mm)		 5.49"
(139.45mm)		 -0.34"
(-8.64mm)		 62nd Driest
Driest since:
 1952
67th Wettest
Wettest since:
 2016
Jun–Oct 2017
5-Month 		6.68"
(169.67mm)		 7.21"
(183.13mm)		 -0.53"
(-13.46mm)		 54th Driest
Driest since:
 1917, 2002
75th Wettest
Wettest since:
 1947
May–Oct 2017
6-Month 		8.50"
(215.90mm)		 9.35"
(237.49mm)		 -0.85"
(-21.59mm)		 44th Driest
Driest since:
 2002
85th Wettest
Wettest since:
 1941
Ties: 1973
Apr–Oct 2017
7-Month 		12.34"
(313.44mm)		 11.71"
(297.43mm)		 0.63"
(16.01mm)		 79th Driest
Driest since:
 2002
50th Wettest
Wettest since:
 1997
Mar–Oct 2017
8-Month 		18.32"
(465.33mm)		 14.97"
(380.24mm)		 3.35"
(85.09mm)		 115th Driest
Driest since:
 1939
14th Wettest
Wettest since:
 1997
Feb–Oct 2017
9-Month 		24.46"
(621.28mm)		 18.58"
(471.93mm)		 5.88"
(149.35mm)		 128th Driest
Driest since:
 1929
1st Wettest
Wettest to Date
 2017
Jan–Oct 2017
10-Month 		28.53"
(724.66mm)		 23.10"
(586.74mm)		 5.43"
(137.92mm)		 124th Driest
Driest since:
 1929
5th Wettest
Wettest since:
 1950
Dec 2016–Oct 2017
11-Month 		33.16"
(842.26mm)		 27.75"
(704.85mm)		 5.41"
(137.41mm)		 118th Driest
Driest since:
 1929
10th Wettest
Wettest since:
 1997
Nov 2016–Oct 2017
12-Month 		37.01"
(940.05mm)		 32.10"
(815.34mm)		 4.91"
(124.71mm)		 108th Driest
Driest since:
 1977
20th Wettest
Wettest since:
 1997
May 2016–Oct 2017
18-Month 		49.43"
(1,255.52mm)		 41.48"
(1,053.59mm)		 7.95"
(201.93mm)		 120th Driest
Driest since:
 1929
8th Wettest
Wettest since:
 1997
Nov 2015–Oct 2017
24-Month 		76.70"
(1,948.18mm)		 64.23"
(1,631.44mm)		 12.47"
(316.74mm)		 120th Driest
Driest since:
 1930
7th Wettest
Wettest since:
 1997
Nov 2014–Oct 2017
36-Month 		104.61"
(2,657.09mm)		 96.31"
(2,446.27mm)		 8.30"
(210.82mm)		 114th Driest
Driest since:
 1931
12th Wettest
Wettest since:
 1997
Nov 2013–Oct 2017
48-Month 		135.70"
(3,446.78mm)		 128.38"
(3,260.85mm)		 7.32"
(185.93mm)		 105th Driest
Driest since:
 1931
20th Wettest
Wettest since:
 1999
Nov 2012–Oct 2017
60-Month 		166.75"
(4,235.45mm)		 160.37"
(4,073.40mm)		 6.38"
(162.05mm)		 96th Driest
Driest since:
 1932
28th Wettest
Wettest since:
 1999

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