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.

West Climate Region

Precipitation Rankings, May 2021

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 2021
1-Month
0.34"
(8.64mm)
0.92"
(23.37mm)
-0.58"
(-14.73mm)
12th Driest
Driest since:
1924
117th Wettest
Wettest since:
1998
Ties: 1966
Apr–May 2021
2-Month
0.68"
(17.27mm)
2.26"
(57.40mm)
-1.58"
(-40.13mm)
3rd Driest
Driest since:
1909
126th Wettest
Wettest since:
1896
Ties: 1924
Mar–May 2021
3-Month
2.07"
(52.58mm)
4.59"
(116.59mm)
-2.52"
(-64.01mm)
6th Driest
Driest since:
2008
123rd Wettest
Wettest since:
1995
Feb–May 2021
4-Month
3.23"
(82.04mm)
7.31"
(185.67mm)
-4.08"
(-103.63mm)
5th Driest
Driest since:
1997
124th Wettest
Wettest since:
1998
Jan–May 2021
5-Month
5.77"
(146.56mm)
10.29"
(261.37mm)
-4.52"
(-114.81mm)
15th Driest
Driest since:
2022
114th Wettest
Wettest since:
1998
Dec 2020–May 2021
6-Month
7.09"
(180.09mm)
12.84"
(326.14mm)
-5.75"
(-146.05mm)
6th Driest
Driest since:
1924
122nd Wettest
Wettest since:
1995
Nov 2020–May 2021
7-Month
8.09"
(205.49mm)
14.71"
(373.63mm)
-6.62"
(-168.14mm)
4th Driest
Driest since:
1977
124th Wettest
Wettest since:
1995
Oct 2020–May 2021
8-Month
8.14"
(206.76mm)
15.74"
(399.80mm)
-7.60"
(-193.04mm)
3rd Driest
Driest since:
1977
125th Wettest
Wettest since:
1983
Sep 2020–May 2021
9-Month
8.19"
(208.03mm)
16.23"
(412.24mm)
-8.04"
(-204.21mm)
1st Driest
Driest since:
2021
127th Wettest
Wettest since:
1983
Aug 2020–May 2021
10-Month
8.30"
(210.82mm)
16.62"
(422.15mm)
-8.32"
(-211.33mm)
1st Driest
Driest since:
2021
127th Wettest
Wettest since:
1983
Jul 2020–May 2021
11-Month
8.37"
(212.60mm)
16.95"
(430.53mm)
-8.58"
(-217.93mm)
1st Driest
Driest since:
2021
127th Wettest
Wettest since:
1983
Jun 2020–May 2021
12-Month
8.69"
(220.73mm)
17.44"
(442.98mm)
-8.75"
(-222.25mm)
1st Driest
Driest since:
2021
127th Wettest
Wettest since:
1983
Dec 2019–May 2021
18-Month
18.76"
(476.50mm)
30.25"
(768.35mm)
-11.49"
(-291.85mm)
2nd Driest
Driest since:
1977
125th Wettest
Wettest since:
1983
Jun 2019–May 2021
24-Month
21.42"
(544.07mm)
34.89"
(886.21mm)
-13.47"
(-342.14mm)
2nd Driest
Driest since:
2022
125th Wettest
Wettest since:
1983
Jun 2018–May 2021
36-Month
43.40"
(1,102.36mm)
52.30"
(1,328.42mm)
-8.90"
(-226.06mm)
21st Driest
Driest since:
2022
105th Wettest
Wettest since:
1984
Jun 2017–May 2021
48-Month
56.94"
(1,446.28mm)
69.56"
(1,766.82mm)
-12.62"
(-320.54mm)
12th Driest
Driest since:
2015
113th Wettest
Wettest since:
1998
Jun 2016–May 2021
60-Month
82.39"
(2,092.71mm)
86.83"
(2,205.48mm)
-4.44"
(-112.77mm)
50th Driest
Driest since:
1933
74th Wettest
Wettest since:
1999

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