Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. 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 2021

View Period (Months):
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  • Record Driest
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 2021
1-Month
1.13"
(28.70mm)
1.11"
(28.19mm)
0.02"
(0.51mm)
74th Driest
Driest since:
1974
55th Wettest
Wettest since:
2015
Ties: 1951, 1985
Apr–May 2021
2-Month
1.68"
(42.67mm)
2.17"
(55.12mm)
-0.49"
(-12.45mm)
40th Driest
Driest since:
2002
89th Wettest
Wettest since:
1941
Ties: 1934, 1943
Mar–May 2021
3-Month
2.77"
(70.36mm)
3.33"
(84.58mm)
-0.56"
(-14.22mm)
38th Driest
Driest since:
2002
91st Wettest
Wettest since:
1941
Feb–May 2021
4-Month
3.40"
(86.36mm)
4.33"
(109.98mm)
-0.93"
(-23.62mm)
33rd Driest
Driest since:
2002
96th Wettest
Wettest since:
1905
Jan–May 2021
5-Month
4.22"
(107.19mm)
5.31"
(134.87mm)
-1.09"
(-27.68mm)
37th Driest
Driest since:
1972
92nd Wettest
Wettest since:
1905
Ties: 1913
Dec 2020–May 2021
6-Month
4.78"
(121.41mm)
6.32"
(160.53mm)
-1.54"
(-39.12mm)
26th Driest
Driest since:
2002
102nd Wettest
Wettest since:
1905
Nov 2020–May 2021
7-Month
5.28"
(134.11mm)
7.21"
(183.13mm)
-1.93"
(-49.02mm)
23rd Driest
Driest since:
2002
105th Wettest
Wettest since:
1941
Oct 2020–May 2021
8-Month
5.68"
(144.27mm)
8.34"
(211.84mm)
-2.66"
(-67.57mm)
12th Driest
Driest since:
2002
116th Wettest
Wettest since:
1941
Sep 2020–May 2021
9-Month
6.23"
(158.24mm)
9.71"
(246.63mm)
-3.48"
(-88.39mm)
4th Driest
Driest since:
2002
124th Wettest
Wettest since:
1941
Aug 2020–May 2021
10-Month
6.82"
(173.23mm)
11.72"
(297.69mm)
-4.90"
(-124.46mm)
2nd Driest
Driest since:
2002
126th Wettest
Wettest since:
1941
Jul 2020–May 2021
11-Month
8.18"
(207.77mm)
13.59"
(345.19mm)
-5.41"
(-137.42mm)
1st Driest
Driest since:
2021
127th Wettest
Wettest since:
1941
Jun 2020–May 2021
12-Month
8.79"
(223.27mm)
14.53"
(369.06mm)
-5.74"
(-145.79mm)
1st Driest
Driest since:
2021
127th Wettest
Wettest since:
1905
Dec 2019–May 2021
18-Month
14.07"
(357.38mm)
20.86"
(529.84mm)
-6.79"
(-172.46mm)
1st Driest
Driest since:
2021
126th Wettest
Wettest since:
1942
Jun 2019–May 2021
24-Month
21.02"
(533.91mm)
29.05"
(737.87mm)
-8.03"
(-203.96mm)
1st Driest
Driest since:
2021
126th Wettest
Wettest since:
1942
Jun 2018–May 2021
36-Month
37.87"
(961.90mm)
43.54"
(1,105.92mm)
-5.67"
(-144.02mm)
14th Driest
Driest since:
2022
112th Wettest
Wettest since:
1907
Jun 2017–May 2021
48-Month
49.06"
(1,246.12mm)
58.01"
(1,473.45mm)
-8.95"
(-227.33mm)
7th Driest
Driest since:
1904
118th Wettest
Wettest since:
1986
Jun 2016–May 2021
60-Month
64.51"
(1,638.55mm)
72.48"
(1,840.99mm)
-7.97"
(-202.44mm)
12th Driest
Driest since:
1957
112th Wettest
Wettest since:
1987

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