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 1931

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
October 1931
1-Month
2.75"
(69.85mm)
2.54"
(64.52mm)
0.21"
(5.33mm)
78th Driest
Driest since:
1895
51st Wettest
Wettest since:
2016
Ties: 2005
Sep–Oct 1931
2-Month
4.42"
(112.27mm)
3.96"
(100.58mm)
0.46"
(11.69mm)
82nd Driest
Driest since:
1987
47th Wettest
Wettest since:
2016
Aug–Oct 1931
3-Month
4.57"
(116.08mm)
4.76"
(120.90mm)
-0.19"
(-4.82mm)
61st Driest
Driest since:
1987
68th Wettest
Wettest since:
2016
Jul–Oct 1931
4-Month
4.76"
(120.90mm)
5.49"
(139.45mm)
-0.73"
(-18.55mm)
48th Driest
Driest since:
1952
81st Wettest
Wettest since:
2016
Ties: 1937
Jun–Oct 1931
5-Month
7.05"
(179.07mm)
7.21"
(183.13mm)
-0.16"
(-4.06mm)
64th Driest
Driest since:
1917, 2002
65th Wettest
Wettest since:
1947
May–Oct 1931
6-Month
7.97"
(202.44mm)
9.35"
(237.49mm)
-1.38"
(-35.05mm)
28th Driest
Driest since:
2002
101st Wettest
Wettest since:
1941
Ties: 1992
Apr–Oct 1931
7-Month
9.74"
(247.40mm)
11.71"
(297.43mm)
-1.97"
(-50.03mm)
23rd Driest
Driest since:
2002
106th Wettest
Wettest since:
1997
Ties: 2006
Mar–Oct 1931
8-Month
14.25"
(361.95mm)
14.97"
(380.24mm)
-0.72"
(-18.29mm)
50th Driest
Driest since:
1939
79th Wettest
Wettest since:
1997
Feb–Oct 1931
9-Month
16.44"
(417.58mm)
18.58"
(471.93mm)
-2.14"
(-54.35mm)
32nd Driest
Driest since:
1929
97th Wettest
Wettest since:
2017
Jan–Oct 1931
10-Month
20.07"
(509.78mm)
23.10"
(586.74mm)
-3.03"
(-76.96mm)
32nd Driest
Driest since:
1929
97th Wettest
Wettest since:
1950
Dec 1930–Oct 1931
11-Month
21.74"
(552.20mm)
27.75"
(704.85mm)
-6.01"
(-152.65mm)
9th Driest
Driest since:
1929
119th Wettest
Wettest since:
1997
Nov 1930–Oct 1931
12-Month
24.31"
(617.47mm)
32.10"
(815.34mm)
-7.79"
(-197.87mm)
6th Driest
Driest since:
1977
122nd Wettest
Wettest since:
1997
May 1930–Oct 1931
18-Month
32.44"
(823.98mm)
41.48"
(1,053.59mm)
-9.04"
(-229.61mm)
7th Driest
Driest since:
1929
121st Wettest
Wettest since:
1997
Nov 1929–Oct 1931
24-Month
50.69"
(1,287.53mm)
64.23"
(1,631.44mm)
-13.54"
(-343.91mm)
3rd Driest
Driest since:
1930
124th Wettest
Wettest since:
1997
Nov 1928–Oct 1931
36-Month
72.76"
(1,848.10mm)
96.31"
(2,446.27mm)
-23.55"
(-598.17mm)
1st Driest
Driest since:
1931
125th Wettest
Wettest since:
1997
Nov 1927–Oct 1931
48-Month
102.06"
(2,592.32mm)
128.38"
(3,260.85mm)
-26.32"
(-668.53mm)
1st Driest
Driest since:
1931
124th Wettest
Wettest since:
1999
Nov 1926–Oct 1931
60-Month
139.10"
(3,533.14mm)
160.37"
(4,073.40mm)
-21.27"
(-540.26mm)
3rd Driest
Driest since:
1932
121st Wettest
Wettest since:
1999

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