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 2012

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
May 2012
1-Month 		0.24"
(6.10mm)		 0.92"
(23.37mm)		 -0.68"
(-17.27mm)		 7th Driest
Driest since:
 1924
122nd Wettest
Wettest since:
 1998
Apr–May 2012
2-Month 		1.97"
(50.04mm)		 2.26"
(57.40mm)		 -0.29"
(-7.36mm)		 58th Driest
Driest since:
 1909
71st Wettest
Wettest since:
 1896
Mar–May 2012
3-Month 		5.17"
(131.32mm)		 4.59"
(116.59mm)		 0.58"
(14.73mm)		 88th Driest
Driest since:
 2008
41st Wettest
Wettest since:
 1995
Feb–May 2012
4-Month 		6.11"
(155.19mm)		 7.31"
(185.67mm)		 -1.20"
(-30.48mm)		 47th Driest
Driest since:
 1997
82nd Wettest
Wettest since:
 1998
Jan–May 2012
5-Month 		8.33"
(211.58mm)		 10.29"
(261.37mm)		 -1.96"
(-49.79mm)		 44th Driest
Driest since:
 2022
85th Wettest
Wettest since:
 1998
Dec 2011–May 2012
6-Month 		8.65"
(219.71mm)		 12.84"
(326.14mm)		 -4.19"
(-106.43mm)		 20th Driest
Driest since:
 1924
108th Wettest
Wettest since:
 1995
Nov 2011–May 2012
7-Month 		9.80"
(248.92mm)		 14.71"
(373.63mm)		 -4.91"
(-124.71mm)		 12th Driest
Driest since:
 1977
116th Wettest
Wettest since:
 1995
Oct 2011–May 2012
8-Month 		11.09"
(281.69mm)		 15.74"
(399.80mm)		 -4.65"
(-118.11mm)		 14th Driest
Driest since:
 1977
114th Wettest
Wettest since:
 1983
Sep 2011–May 2012
9-Month 		11.45"
(290.83mm)		 16.23"
(412.24mm)		 -4.78"
(-121.41mm)		 12th Driest
Driest since:
 2021
116th Wettest
Wettest since:
 1983
Aug 2011–May 2012
10-Month 		11.61"
(294.89mm)		 16.62"
(422.15mm)		 -5.01"
(-127.26mm)		 11th Driest
Driest since:
 2021
117th Wettest
Wettest since:
 1983
Jul 2011–May 2012
11-Month 		11.95"
(303.53mm)		 16.95"
(430.53mm)		 -5.00"
(-127.00mm)		 12th Driest
Driest since:
 2021
116th Wettest
Wettest since:
 1983
Jun 2011–May 2012
12-Month 		12.72"
(323.09mm)		 17.44"
(442.98mm)		 -4.72"
(-119.89mm)		 14th Driest
Driest since:
 2021
114th Wettest
Wettest since:
 1983
Ties: 1933
Dec 2010–May 2012
18-Month 		28.88"
(733.55mm)		 30.25"
(768.35mm)		 -1.37"
(-34.80mm)		 58th Driest
Driest since:
 1977
69th Wettest
Wettest since:
 1983
Jun 2010–May 2012
24-Month 		34.38"
(873.25mm)		 34.89"
(886.21mm)		 -0.51"
(-12.96mm)		 64th Driest
Driest since:
 2022
63rd Wettest
Wettest since:
 1983
Jun 2009–May 2012
36-Month 		52.84"
(1,342.14mm)		 52.30"
(1,328.42mm)		 0.54"
(13.72mm)		 73rd Driest
Driest since:
 2022
53rd Wettest
Wettest since:
 1984
Jun 2008–May 2012
48-Month 		65.75"
(1,670.05mm)		 69.56"
(1,766.82mm)		 -3.81"
(-96.77mm)		 54th Driest
Driest since:
 2015
71st Wettest
Wettest since:
 1998
Jun 2007–May 2012
60-Month 		79.80"
(2,026.92mm)		 86.83"
(2,205.48mm)		 -7.03"
(-178.56mm)		 39th Driest
Driest since:
 1933
85th Wettest
Wettest since:
 1999

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