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, May 1931

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
May 1931
1-Month
0.92"
(23.37mm)
2.14"
(54.36mm)
-1.22"
(-30.99mm)
5th Driest
Driest since:
1924
124th Wettest
Wettest since:
1998
Apr–May 1931
2-Month
2.69"
(68.33mm)
4.50"
(114.30mm)
-1.81"
(-45.97mm)
6th Driest
Driest since:
1924
123rd Wettest
Wettest since:
1996
Mar–May 1931
3-Month
7.20"
(182.88mm)
7.76"
(197.10mm)
-0.56"
(-14.22mm)
50th Driest
Driest since:
1924
79th Wettest
Wettest since:
2011
Ties: 1935
Feb–May 1931
4-Month
9.39"
(238.51mm)
11.37"
(288.80mm)
-1.98"
(-50.29mm)
27th Driest
Driest since:
1924
102nd Wettest
Wettest since:
1904
Jan–May 1931
5-Month
13.02"
(330.71mm)
15.90"
(403.86mm)
-2.88"
(-73.15mm)
22nd Driest
Driest since:
1924
107th Wettest
Wettest since:
1904
Dec 1930–May 1931
6-Month
14.69"
(373.13mm)
20.54"
(521.72mm)
-5.85"
(-148.59mm)
7th Driest
Driest since:
1977
121st Wettest
Wettest since:
1997
Nov 1930–May 1931
7-Month
17.26"
(438.40mm)
24.89"
(632.21mm)
-7.63"
(-193.81mm)
5th Driest
Driest since:
1977
123rd Wettest
Wettest since:
1974
Oct 1930–May 1931
8-Month
19.45"
(494.03mm)
27.45"
(697.23mm)
-8.00"
(-203.20mm)
4th Driest
Driest since:
1977
124th Wettest
Wettest since:
1974
Sep 1930–May 1931
9-Month
21.06"
(534.92mm)
28.87"
(733.30mm)
-7.81"
(-198.38mm)
7th Driest
Driest since:
1977
121st Wettest
Wettest since:
1974
Aug 1930–May 1931
10-Month
21.78"
(553.21mm)
29.68"
(753.87mm)
-7.90"
(-200.66mm)
7th Driest
Driest since:
1977
121st Wettest
Wettest since:
1974
Jul 1930–May 1931
11-Month
21.99"
(558.55mm)
30.40"
(772.16mm)
-8.41"
(-213.61mm)
5th Driest
Driest since:
1977
123rd Wettest
Wettest since:
1974
Jun 1930–May 1931
12-Month
23.06"
(585.72mm)
32.13"
(816.10mm)
-9.07"
(-230.38mm)
4th Driest
Driest since:
1977
124th Wettest
Wettest since:
1996
Dec 1929–May 1931
18-Month
43.18"
(1,096.77mm)
52.65"
(1,337.31mm)
-9.47"
(-240.54mm)
6th Driest
Driest since:
1930
121st Wettest
Wettest since:
1997
Jun 1929–May 1931
24-Month
47.88"
(1,216.15mm)
64.28"
(1,632.71mm)
-16.40"
(-416.56mm)
2nd Driest
Driest since:
1930
125th Wettest
Wettest since:
1997
Jun 1928–May 1931
36-Month
70.60"
(1,793.24mm)
96.36"
(2,447.54mm)
-25.76"
(-654.30mm)
1st Driest
Driest since:
1931
125th Wettest
Wettest since:
1998
Jun 1927–May 1931
48-Month
103.91"
(2,639.31mm)
128.40"
(3,261.36mm)
-24.49"
(-622.05mm)
1st Driest
Driest since:
1931
124th Wettest
Wettest since:
1999
Jun 1926–May 1931
60-Month
138.85"
(3,526.79mm)
160.37"
(4,073.40mm)
-21.52"
(-546.61mm)
3rd Driest
Driest since:
1933
121st Wettest
Wettest since:
1999

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