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, April 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
April 2021
1-Month
0.34"
(8.64mm)
1.33"
(33.78mm)
-0.99"
(-25.14mm)
6th Driest
Driest since:
1909
123rd Wettest
Wettest since:
1935
Mar–Apr 2021
2-Month
1.73"
(43.94mm)
3.67"
(93.22mm)
-1.94"
(-49.28mm)
12th Driest
Driest since:
2008
117th Wettest
Wettest since:
1983
Feb–Apr 2021
3-Month
2.89"
(73.41mm)
6.39"
(162.31mm)
-3.50"
(-88.90mm)
8th Driest
Driest since:
1997
121st Wettest
Wettest since:
1983
Jan–Apr 2021
4-Month
5.43"
(137.92mm)
9.37"
(238.00mm)
-3.94"
(-100.08mm)
17th Driest
Driest since:
2022
112th Wettest
Wettest since:
1995
Dec 2020–Apr 2021
5-Month
6.75"
(171.45mm)
11.92"
(302.77mm)
-5.17"
(-131.32mm)
9th Driest
Driest since:
1977
119th Wettest
Wettest since:
1978
Nov 2020–Apr 2021
6-Month
7.75"
(196.85mm)
13.79"
(350.27mm)
-6.04"
(-153.42mm)
5th Driest
Driest since:
1977
123rd Wettest
Wettest since:
1983
Oct 2020–Apr 2021
7-Month
7.80"
(198.12mm)
14.82"
(376.43mm)
-7.02"
(-178.31mm)
3rd Driest
Driest since:
1977
125th Wettest
Wettest since:
1983
Sep 2020–Apr 2021
8-Month
7.85"
(199.39mm)
15.31"
(388.87mm)
-7.46"
(-189.48mm)
2nd Driest
Driest since:
1977
126th Wettest
Wettest since:
1983
Aug 2020–Apr 2021
9-Month
7.96"
(202.18mm)
15.70"
(398.78mm)
-7.74"
(-196.60mm)
2nd Driest
Driest since:
1977
126th Wettest
Wettest since:
1983
Jul 2020–Apr 2021
10-Month
8.03"
(203.96mm)
16.03"
(407.16mm)
-8.00"
(-203.20mm)
1st Driest
Driest since:
2021
127th Wettest
Wettest since:
1983
Jun 2020–Apr 2021
11-Month
8.35"
(212.09mm)
16.52"
(419.61mm)
-8.17"
(-207.52mm)
1st Driest
Driest since:
2021
127th Wettest
Wettest since:
1983
May 2020–Apr 2021
12-Month
9.32"
(236.73mm)
17.44"
(442.98mm)
-8.12"
(-206.25mm)
2nd Driest
Driest since:
1977
126th Wettest
Wettest since:
1983
Nov 2019–Apr 2021
18-Month
19.77"
(502.16mm)
31.22"
(792.99mm)
-11.45"
(-290.83mm)
2nd Driest
Driest since:
1977
125th Wettest
Wettest since:
1983
May 2019–Apr 2021
24-Month
23.62"
(599.95mm)
34.90"
(886.46mm)
-11.28"
(-286.51mm)
3rd Driest
Driest since:
1977
124th Wettest
Wettest since:
1983
May 2018–Apr 2021
36-Month
44.06"
(1,119.12mm)
52.30"
(1,328.42mm)
-8.24"
(-209.30mm)
24th Driest
Driest since:
2022
102nd Wettest
Wettest since:
1984
May 2017–Apr 2021
48-Month
57.07"
(1,449.58mm)
69.56"
(1,766.82mm)
-12.49"
(-317.24mm)
14th Driest
Driest since:
2015
111th Wettest
Wettest since:
1998
May 2016–Apr 2021
60-Month
82.91"
(2,105.91mm)
86.83"
(2,205.48mm)
-3.92"
(-99.57mm)
51st Driest
Driest since:
1933
73rd Wettest
Wettest since:
1999

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