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 1974

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 1974
1-Month
1.55"
(39.37mm)
2.14"
(54.36mm)
-0.59"
(-14.99mm)
30th Driest
Driest since:
1924
99th Wettest
Wettest since:
1998
Ties: 1970
Apr–May 1974
2-Month
4.11"
(104.39mm)
4.50"
(114.30mm)
-0.39"
(-9.91mm)
49th Driest
Driest since:
1924
80th Wettest
Wettest since:
1996
Mar–May 1974
3-Month
9.48"
(240.79mm)
7.76"
(197.10mm)
1.72"
(43.69mm)
101st Driest
Driest since:
1924
28th Wettest
Wettest since:
2011
Feb–May 1974
4-Month
13.36"
(339.34mm)
11.37"
(288.80mm)
1.99"
(50.54mm)
105th Driest
Driest since:
1924
24th Wettest
Wettest since:
1904
Ties: 1991
Jan–May 1974
5-Month
20.04"
(509.02mm)
15.90"
(403.86mm)
4.14"
(105.16mm)
120th Driest
Driest since:
1924
9th Wettest
Wettest since:
1904
Dec 1973–May 1974
6-Month
26.85"
(681.99mm)
20.54"
(521.72mm)
6.31"
(160.27mm)
125th Driest
Driest since:
1977
3rd Wettest
Wettest to Date
1997
Nov 1973–May 1974
7-Month
35.82"
(909.83mm)
24.89"
(632.21mm)
10.93"
(277.62mm)
127th Driest
Driest since:
1977
1st Wettest
Wettest to Date
1974
Oct 1973–May 1974
8-Month
38.38"
(974.85mm)
27.45"
(697.23mm)
10.93"
(277.62mm)
127th Driest
Driest since:
1977
1st Wettest
Wettest to Date
1974
Sep 1973–May 1974
9-Month
40.60"
(1,031.24mm)
28.87"
(733.30mm)
11.73"
(297.94mm)
127th Driest
Driest since:
1977
1st Wettest
Wettest to Date
1974
Aug 1973–May 1974
10-Month
41.02"
(1,041.91mm)
29.68"
(753.87mm)
11.34"
(288.04mm)
127th Driest
Driest since:
1977
1st Wettest
Wettest to Date
1974
Jul 1973–May 1974
11-Month
41.44"
(1,052.58mm)
30.40"
(772.16mm)
11.04"
(280.42mm)
127th Driest
Driest since:
1977
1st Wettest
Wettest to Date
1974
Jun 1973–May 1974
12-Month
42.74"
(1,085.60mm)
32.13"
(816.10mm)
10.61"
(269.50mm)
126th Driest
Driest since:
1977
2nd Wettest
Wettest to Date
1996
Dec 1972–May 1974
18-Month
58.93"
(1,496.82mm)
52.65"
(1,337.31mm)
6.28"
(159.51mm)
111th Driest
Driest since:
1930
16th Wettest
Wettest since:
1997
Jun 1972–May 1974
24-Month
68.53"
(1,740.66mm)
64.28"
(1,632.71mm)
4.25"
(107.95mm)
100th Driest
Driest since:
1930
27th Wettest
Wettest since:
1997
Jun 1971–May 1974
36-Month
107.06"
(2,719.32mm)
96.36"
(2,447.54mm)
10.70"
(271.78mm)
116th Driest
Driest since:
1931
10th Wettest
Wettest since:
1998
Jun 1970–May 1974
48-Month
144.64"
(3,673.86mm)
128.40"
(3,261.36mm)
16.24"
(412.50mm)
117th Driest
Driest since:
1931
8th Wettest
Wettest since:
1999
Jun 1969–May 1974
60-Month
176.79"
(4,490.47mm)
160.37"
(4,073.40mm)
16.42"
(417.07mm)
116th Driest
Driest since:
1933
8th Wettest
Wettest to Date
1999

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