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 Driest
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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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