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 1931

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
May 1931
1-Month 		0.73"
(18.54mm)		 0.92"
(23.37mm)		 -0.19"
(-4.83mm)		 59th Driest
Driest since:
 1924
70th Wettest
Wettest since:
 1998
Ties: 1902, 1967, 2008
Apr–May 1931
2-Month 		1.83"
(46.48mm)		 2.26"
(57.40mm)		 -0.43"
(-10.92mm)		 52nd Driest
Driest since:
 1909
77th Wettest
Wettest since:
 1896
Mar–May 1931
3-Month 		2.85"
(72.39mm)		 4.59"
(116.59mm)		 -1.74"
(-44.20mm)		 22nd Driest
Driest since:
 2008
107th Wettest
Wettest since:
 1995
Feb–May 1931
4-Month 		4.67"
(118.62mm)		 7.31"
(185.67mm)		 -2.64"
(-67.05mm)		 22nd Driest
Driest since:
 1997
107th Wettest
Wettest since:
 1998
Jan–May 1931
5-Month 		6.96"
(176.78mm)		 10.29"
(261.37mm)		 -3.33"
(-84.59mm)		 25th Driest
Driest since:
 2022
104th Wettest
Wettest since:
 1998
Dec 1930–May 1931
6-Month 		7.32"
(185.93mm)		 12.84"
(326.14mm)		 -5.52"
(-140.21mm)		 7th Driest
Driest since:
 1924
121st Wettest
Wettest since:
 1995
Nov 1930–May 1931
7-Month 		8.97"
(227.84mm)		 14.71"
(373.63mm)		 -5.74"
(-145.79mm)		 7th Driest
Driest since:
 1977
121st Wettest
Wettest since:
 1995
Oct 1930–May 1931
8-Month 		9.55"
(242.57mm)		 15.74"
(399.80mm)		 -6.19"
(-157.23mm)		 5th Driest
Driest since:
 1977
123rd Wettest
Wettest since:
 1983
Sep 1930–May 1931
9-Month 		10.22"
(259.59mm)		 16.23"
(412.24mm)		 -6.01"
(-152.65mm)		 6th Driest
Driest since:
 2021
122nd Wettest
Wettest since:
 1983
Aug 1930–May 1931
10-Month 		10.71"
(272.03mm)		 16.62"
(422.15mm)		 -5.91"
(-150.12mm)		 7th Driest
Driest since:
 2021
121st Wettest
Wettest since:
 1983
Jul 1930–May 1931
11-Month 		10.84"
(275.34mm)		 16.95"
(430.53mm)		 -6.11"
(-155.19mm)		 6th Driest
Driest since:
 2021
122nd Wettest
Wettest since:
 1983
Jun 1930–May 1931
12-Month 		10.96"
(278.38mm)		 17.44"
(442.98mm)		 -6.48"
(-164.60mm)		 6th Driest
Driest since:
 2021
122nd Wettest
Wettest since:
 1983
Dec 1929–May 1931
18-Month 		24.01"
(609.85mm)		 30.25"
(768.35mm)		 -6.24"
(-158.50mm)		 23rd Driest
Driest since:
 1977
104th Wettest
Wettest since:
 1983
Jun 1929–May 1931
24-Month 		26.04"
(661.42mm)		 34.89"
(886.21mm)		 -8.85"
(-224.79mm)		 12th Driest
Driest since:
 2022
115th Wettest
Wettest since:
 1983
Jun 1928–May 1931
36-Month 		36.80"
(934.72mm)		 52.30"
(1,328.42mm)		 -15.50"
(-393.70mm)		 3rd Driest
Driest to Date
 2022
123rd Wettest
Wettest since:
 1984
Jun 1927–May 1931
48-Month 		52.04"
(1,321.82mm)		 69.56"
(1,766.82mm)		 -17.52"
(-445.00mm)		 2nd Driest
Driest to Date
 2015
123rd Wettest
Wettest since:
 1998
Jun 1926–May 1931
60-Month 		71.84"
(1,824.74mm)		 86.83"
(2,205.48mm)		 -14.99"
(-380.74mm)		 8th Driest
Driest to Date
 1933
116th Wettest
Wettest since:
 1999

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