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 2011

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Wettest/Driest
Since		Record
May 2011
1-Month		1.47"
(37.34mm)		0.92"
(23.37mm)		0.55"
(13.97mm)		108th Driest
Driest since:
1924
21st Wettest
Wettest since:
1998
Apr–May 2011
2-Month		2.62"
(66.55mm)		2.26"
(57.40mm)		0.36"
(9.15mm)		90th Driest
Driest since:
1909
39th Wettest
Wettest since:
1896
Mar–May 2011
3-Month		7.04"
(178.82mm)		4.59"
(116.59mm)		2.45"
(62.23mm)		116th Driest
Driest since:
2008
13th Wettest
Wettest since:
1995
Ties: 1982
Feb–May 2011
4-Month		9.34"
(237.24mm)		7.31"
(185.67mm)		2.03"
(51.57mm)		105th Driest
Driest since:
1997
24th Wettest
Wettest since:
1998
Jan–May 2011
5-Month		10.21"
(259.33mm)		10.29"
(261.37mm)		-0.08"
(-2.04mm)		75th Driest
Driest since:
2022
54th Wettest
Wettest since:
1998
Ties: 1956
Dec 2010–May 2011
6-Month		16.16"
(410.46mm)		12.84"
(326.14mm)		3.32"
(84.32mm)		103rd Driest
Driest since:
1924
25th Wettest
Wettest since:
1995
Nov 2010–May 2011
7-Month		18.18"
(461.77mm)		14.71"
(373.63mm)		3.47"
(88.14mm)		104th Driest
Driest since:
1977
24th Wettest
Wettest since:
1995
Oct 2010–May 2011
8-Month		20.86"
(529.84mm)		15.74"
(399.80mm)		5.12"
(130.04mm)		112th Driest
Driest since:
1977
16th Wettest
Wettest since:
1983
Sep 2010–May 2011
9-Month		21.07"
(535.18mm)		16.23"
(412.24mm)		4.84"
(122.94mm)		111th Driest
Driest since:
2021
17th Wettest
Wettest since:
1983
Aug 2010–May 2011
10-Month		21.23"
(539.24mm)		16.62"
(422.15mm)		4.61"
(117.09mm)		109th Driest
Driest since:
2021
19th Wettest
Wettest since:
1983
Jul 2010–May 2011
11-Month		21.42"
(544.07mm)		16.95"
(430.53mm)		4.47"
(113.54mm)		109th Driest
Driest since:
2021
19th Wettest
Wettest since:
1983
Jun 2010–May 2011
12-Month		21.66"
(550.16mm)		17.44"
(442.98mm)		4.22"
(107.18mm)		109th Driest
Driest since:
2021
19th Wettest
Wettest since:
1983
Dec 2009–May 2011
18-Month		36.30"
(922.02mm)		30.25"
(768.35mm)		6.05"
(153.67mm)		113th Driest
Driest since:
1977
14th Wettest
Wettest since:
1983
Jun 2009–May 2011
24-Month		40.12"
(1,019.05mm)		34.89"
(886.21mm)		5.23"
(132.84mm)		109th Driest
Driest since:
2022
18th Wettest
Wettest since:
1983
Jun 2008–May 2011
36-Month		53.03"
(1,346.96mm)		52.30"
(1,328.42mm)		0.73"
(18.54mm)		76th Driest
Driest since:
2022
50th Wettest
Wettest since:
1984
Jun 2007–May 2011
48-Month		67.08"
(1,703.83mm)		69.56"
(1,766.82mm)		-2.48"
(-62.99mm)		58th Driest
Driest since:
2015
67th Wettest
Wettest since:
1998
Jun 2006–May 2011
60-Month		77.68"
(1,973.07mm)		86.83"
(2,205.48mm)		-9.15"
(-232.41mm)		22nd Driest
Driest since:
1933
102nd Wettest
Wettest since:
1999

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