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.

Southwest Climate Region

Precipitation Rankings, May 2011

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
May 2011
1-Month 		1.32"
(33.53mm)		 1.11"
(28.19mm)		 0.21"
(5.34mm)		 95th Driest
Driest since:
 1974
34th Wettest
Wettest since:
 2015
Apr–May 2011
2-Month 		2.42"
(61.47mm)		 2.17"
(55.12mm)		 0.25"
(6.35mm)		 89th Driest
Driest since:
 2002
40th Wettest
Wettest since:
 1941
Ties: 1973
Mar–May 2011
3-Month 		3.09"
(78.49mm)		 3.33"
(84.58mm)		 -0.24"
(-6.09mm)		 60th Driest
Driest since:
 2002
69th Wettest
Wettest since:
 1941
Ties: 1961, 1976, 2010, 2017
Feb–May 2011
4-Month 		4.00"
(101.60mm)		 4.33"
(109.98mm)		 -0.33"
(-8.38mm)		 59th Driest
Driest since:
 2002
70th Wettest
Wettest since:
 1905
Jan–May 2011
5-Month 		4.29"
(108.97mm)		 5.31"
(134.87mm)		 -1.02"
(-25.90mm)		 41st Driest
Driest since:
 1972
88th Wettest
Wettest since:
 1905
Dec 2010–May 2011
6-Month 		6.00"
(152.40mm)		 6.32"
(160.53mm)		 -0.32"
(-8.13mm)		 67th Driest
Driest since:
 2002
61st Wettest
Wettest since:
 1905
Nov 2010–May 2011
7-Month 		6.59"
(167.39mm)		 7.21"
(183.13mm)		 -0.62"
(-15.74mm)		 52nd Driest
Driest since:
 2002
76th Wettest
Wettest since:
 1941
Oct 2010–May 2011
8-Month 		8.04"
(204.22mm)		 8.34"
(211.84mm)		 -0.30"
(-7.62mm)		 63rd Driest
Driest since:
 2002
65th Wettest
Wettest since:
 1941
Sep 2010–May 2011
9-Month 		8.85"
(224.79mm)		 9.71"
(246.63mm)		 -0.86"
(-21.84mm)		 46th Driest
Driest since:
 2002
82nd Wettest
Wettest since:
 1941
Aug 2010–May 2011
10-Month 		10.84"
(275.34mm)		 11.72"
(297.69mm)		 -0.88"
(-22.35mm)		 48th Driest
Driest since:
 2002
80th Wettest
Wettest since:
 1941
Ties: 1969
Jul 2010–May 2011
11-Month 		13.21"
(335.53mm)		 13.59"
(345.19mm)		 -0.38"
(-9.66mm)		 65th Driest
Driest since:
 2021
63rd Wettest
Wettest since:
 1941
Ties: 1965
Jun 2010–May 2011
12-Month 		13.97"
(354.84mm)		 14.53"
(369.06mm)		 -0.56"
(-14.22mm)		 62nd Driest
Driest since:
 2021
66th Wettest
Wettest since:
 1905
Dec 2009–May 2011
18-Month 		21.39"
(543.31mm)		 20.86"
(529.84mm)		 0.53"
(13.47mm)		 86th Driest
Driest since:
 2021
41st Wettest
Wettest since:
 1942
Jun 2009–May 2011
24-Month 		28.17"
(715.52mm)		 29.05"
(737.87mm)		 -0.88"
(-22.35mm)		 62nd Driest
Driest since:
 2021
65th Wettest
Wettest since:
 1942
Jun 2008–May 2011
36-Month 		41.82"
(1,062.23mm)		 43.54"
(1,105.92mm)		 -1.72"
(-43.69mm)		 50th Driest
Driest since:
 2022
76th Wettest
Wettest since:
 1907
Jun 2007–May 2011
48-Month 		55.49"
(1,409.45mm)		 58.01"
(1,473.45mm)		 -2.52"
(-64.00mm)		 46th Driest
Driest since:
 1904
79th Wettest
Wettest since:
 1986
Jun 2006–May 2011
60-Month 		71.71"
(1,821.43mm)		 72.48"
(1,840.99mm)		 -0.77"
(-19.56mm)		 63rd Driest
Driest since:
 1957
61st Wettest
Wettest since:
 1987

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