Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Degree Days are not available for Great Plains, Souther Plains and Gulf Coast Rockies and Westward, River Basins, or Agricultural Belts. 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 2020

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
May 2020
1-Month 		0.97"
(24.64mm)		 0.92"
(23.37mm)		 0.05"
(1.27mm)		 80th Driest
Driest since:
 1924
49th Wettest
Wettest since:
 1998
Apr–May 2020
2-Month 		2.42"
(61.47mm)		 2.26"
(57.40mm)		 0.16"
(4.07mm)		 81st Driest
Driest since:
 1909
48th Wettest
Wettest since:
 1896
Mar–May 2020
3-Month 		4.82"
(122.43mm)		 4.59"
(116.59mm)		 0.23"
(5.84mm)		 76th Driest
Driest since:
 2008
53rd Wettest
Wettest since:
 1995
Feb–May 2020
4-Month 		5.10"
(129.54mm)		 7.31"
(185.67mm)		 -2.21"
(-56.13mm)		 29th Driest
Driest since:
 1997
100th Wettest
Wettest since:
 1998
Jan–May 2020
5-Month 		6.60"
(167.64mm)		 10.29"
(261.37mm)		 -3.69"
(-93.73mm)		 22nd Driest
Driest since:
 2022
107th Wettest
Wettest since:
 1998
Dec 2019–May 2020
6-Month 		10.07"
(255.78mm)		 12.84"
(326.14mm)		 -2.77"
(-70.36mm)		 35th Driest
Driest since:
 1924
93rd Wettest
Wettest since:
 1995
Nov 2019–May 2020
7-Month 		11.42"
(290.07mm)		 14.71"
(373.63mm)		 -3.29"
(-83.56mm)		 32nd Driest
Driest since:
 1977
96th Wettest
Wettest since:
 1995
Oct 2019–May 2020
8-Month 		11.56"
(293.62mm)		 15.74"
(399.80mm)		 -4.18"
(-106.18mm)		 23rd Driest
Driest since:
 1977
105th Wettest
Wettest since:
 1983
Sep 2019–May 2020
9-Month 		12.24"
(310.90mm)		 16.23"
(412.24mm)		 -3.99"
(-101.34mm)		 25th Driest
Driest since:
 2021
103rd Wettest
Wettest since:
 1983
Aug 2019–May 2020
10-Month 		12.39"
(314.71mm)		 16.62"
(422.15mm)		 -4.23"
(-107.44mm)		 19th Driest
Driest since:
 2021
109th Wettest
Wettest since:
 1983
Jul 2019–May 2020
11-Month 		12.55"
(318.77mm)		 16.95"
(430.53mm)		 -4.40"
(-111.76mm)		 18th Driest
Driest since:
 2021
110th Wettest
Wettest since:
 1983
Ties: 1990
Jun 2019–May 2020
12-Month 		12.73"
(323.34mm)		 17.44"
(442.98mm)		 -4.71"
(-119.64mm)		 16th Driest
Driest since:
 2021
112th Wettest
Wettest since:
 1983
Dec 2018–May 2020
18-Month 		31.19"
(792.23mm)		 30.25"
(768.35mm)		 0.94"
(23.88mm)		 81st Driest
Driest since:
 1977
46th Wettest
Wettest since:
 1983
Jun 2018–May 2020
24-Month 		34.71"
(881.63mm)		 34.89"
(886.21mm)		 -0.18"
(-4.58mm)		 67th Driest
Driest since:
 2022
60th Wettest
Wettest since:
 1983
Jun 2017–May 2020
36-Month 		48.25"
(1,225.55mm)		 52.30"
(1,328.42mm)		 -4.05"
(-102.87mm)		 45th Driest
Driest since:
 2022
81st Wettest
Wettest since:
 1984
Jun 2016–May 2020
48-Month 		73.70"
(1,871.98mm)		 69.56"
(1,766.82mm)		 4.14"
(105.16mm)		 92nd Driest
Driest since:
 2015
33rd Wettest
Wettest since:
 1998
Jun 2015–May 2020
60-Month 		92.82"
(2,357.63mm)		 86.83"
(2,205.48mm)		 5.99"
(152.15mm)		 95th Driest
Driest since:
 1933
29th Wettest
Wettest since:
 1999

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