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 1904

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1904
1-Month
0.90"
(22.86mm)
2.14"
(54.36mm)
-1.24"
(-31.50mm)
4th Driest
Driest since:
1924
125th Wettest
Wettest since:
1998
Apr–May 1904
2-Month
3.46"
(87.88mm)
4.50"
(114.30mm)
-1.04"
(-26.42mm)
19th Driest
Driest since:
1924
110th Wettest
Wettest since:
1996
Ties: 1949, 2016
Mar–May 1904
3-Month
10.82"
(274.83mm)
7.76"
(197.10mm)
3.06"
(77.73mm)
123rd Driest
Driest since:
1924
6th Wettest
Wettest to Date
2011
Feb–May 1904
4-Month
18.40"
(467.36mm)
11.37"
(288.80mm)
7.03"
(178.56mm)
128th Driest
Driest since:
1924
1st Wettest
Wettest to Date
1904
Jan–May 1904
5-Month
22.17"
(563.12mm)
15.90"
(403.86mm)
6.27"
(159.26mm)
128th Driest
Driest since:
1924
1st Wettest
Wettest to Date
1904
Dec 1903–May 1904
6-Month
24.82"
(630.43mm)
20.54"
(521.72mm)
4.28"
(108.71mm)
112th Driest
Driest since:
1977
16th Wettest
Wettest since:
1997
Nov 1903–May 1904
7-Month
32.36"
(821.94mm)
24.89"
(632.21mm)
7.47"
(189.73mm)
123rd Driest
Driest since:
1977
5th Wettest
Wettest to Date
1974
Oct 1903–May 1904
8-Month
34.26"
(870.20mm)
27.45"
(697.23mm)
6.81"
(172.97mm)
120th Driest
Driest since:
1977
8th Wettest
Wettest to Date
1974
Sep 1903–May 1904
9-Month
35.92"
(912.37mm)
28.87"
(733.30mm)
7.05"
(179.07mm)
121st Driest
Driest since:
1977
7th Wettest
Wettest to Date
1974
Aug 1903–May 1904
10-Month
36.86"
(936.24mm)
29.68"
(753.87mm)
7.18"
(182.37mm)
120th Driest
Driest since:
1977
8th Wettest
Wettest to Date
1974
Jul 1903–May 1904
11-Month
37.63"
(955.80mm)
30.40"
(772.16mm)
7.23"
(183.64mm)
120th Driest
Driest since:
1977
8th Wettest
Wettest to Date
1974
Jun 1903–May 1904
12-Month
39.48"
(1,002.79mm)
32.13"
(816.10mm)
7.35"
(186.69mm)
119th Driest
Driest since:
1977
9th Wettest
Wettest to Date
1996
Dec 1902–May 1904
18-Month
60.25"
(1,530.35mm)
52.65"
(1,337.31mm)
7.60"
(193.04mm)
115th Driest
Driest since:
1930
12th Wettest
Wettest since:
1997
Jun 1902–May 1904
24-Month
71.66"
(1,820.16mm)
64.28"
(1,632.71mm)
7.38"
(187.45mm)
113th Driest
Driest since:
1930
14th Wettest
Wettest to Date
1997
Jun 1901–May 1904
36-Month
103.80"
(2,636.52mm)
96.36"
(2,447.54mm)
7.44"
(188.98mm)
108th Driest
Driest since:
1931
18th Wettest
Wettest to Date
1998
Jun 1900–May 1904
48-Month
137.51"
(3,492.75mm)
128.40"
(3,261.36mm)
9.11"
(231.39mm)
110th Driest
Driest since:
1931
15th Wettest
Wettest to Date
1999
Jun 1899–May 1904
60-Month
170.43"
(4,328.92mm)
160.37"
(4,073.40mm)
10.06"
(255.52mm)
107th Driest
Driest since:
1933
17th Wettest
Wettest to Date
1999

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