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.

Northern Rockies and Plains Climate Region

Precipitation Rankings, May 2012

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 2012
1-Month
2.17"
(55.12mm)
2.62"
(66.55mm)
-0.45"
(-11.43mm)
37th Driest
Driest since:
1934
92nd Wettest
Wettest since:
2011
Apr–May 2012
2-Month
4.37"
(111.00mm)
4.36"
(110.74mm)
0.01"
(0.26mm)
70th Driest
Driest since:
1934
59th Wettest
Wettest since:
2011
Ties: 1902, 1929
Mar–May 2012
3-Month
5.22"
(132.59mm)
5.52"
(140.21mm)
-0.30"
(-7.62mm)
54th Driest
Driest since:
1934
75th Wettest
Wettest since:
2011
Feb–May 2012
4-Month
6.27"
(159.26mm)
6.31"
(160.27mm)
-0.04"
(-1.01mm)
62nd Driest
Driest since:
1934
67th Wettest
Wettest since:
2011
Ties: 1945, 1955
Jan–May 2012
5-Month
6.99"
(177.55mm)
7.19"
(182.63mm)
-0.20"
(-5.08mm)
56th Driest
Driest since:
1934
73rd Wettest
Wettest since:
2011
Dec 2011–May 2012
6-Month
7.61"
(193.29mm)
8.06"
(204.72mm)
-0.45"
(-11.43mm)
44th Driest
Driest since:
1931
84th Wettest
Wettest since:
2011
Ties: 1914
Nov 2011–May 2012
7-Month
8.38"
(212.85mm)
9.01"
(228.85mm)
-0.63"
(-16.00mm)
39th Driest
Driest since:
1934
89th Wettest
Wettest since:
2011
Oct 2011–May 2012
8-Month
10.03"
(254.76mm)
10.26"
(260.60mm)
-0.23"
(-5.84mm)
52nd Driest
Driest since:
1934
76th Wettest
Wettest since:
2011
Sep 2011–May 2012
9-Month
10.76"
(273.30mm)
11.84"
(300.74mm)
-1.08"
(-27.44mm)
27th Driest
Driest since:
1934
101st Wettest
Wettest since:
2011
Aug 2011–May 2012
10-Month
12.50"
(317.50mm)
13.60"
(345.44mm)
-1.10"
(-27.94mm)
30th Driest
Driest since:
1934
98th Wettest
Wettest since:
2011
Ties: 1900
Jul 2011–May 2012
11-Month
14.84"
(376.94mm)
15.67"
(398.02mm)
-0.83"
(-21.08mm)
42nd Driest
Driest since:
1934
86th Wettest
Wettest since:
2011
Jun 2011–May 2012
12-Month
18.20"
(462.28mm)
18.62"
(472.95mm)
-0.42"
(-10.67mm)
49th Driest
Driest since:
1934
79th Wettest
Wettest since:
2011
Ties: 1979
Dec 2010–May 2012
18-Month
30.38"
(771.65mm)
26.68"
(677.67mm)
3.70"
(93.98mm)
116th Driest
Driest since:
1937
11th Wettest
Wettest since:
2011
Jun 2010–May 2012
24-Month
43.37"
(1,101.60mm)
37.24"
(945.90mm)
6.13"
(155.70mm)
123rd Driest
Driest since:
1937
4th Wettest
Wettest since:
2011
Ties: 2020
Jun 2009–May 2012
36-Month
64.58"
(1,640.33mm)
55.80"
(1,417.32mm)
8.78"
(223.01mm)
123rd Driest
Driest since:
1936
3rd Wettest
Wettest since:
2011
Jun 2008–May 2012
48-Month
84.63"
(2,149.60mm)
74.37"
(1,889.00mm)
10.26"
(260.60mm)
122nd Driest
Driest since:
1937
3rd Wettest
Wettest since:
1996
Jun 2007–May 2012
60-Month
103.17"
(2,620.52mm)
92.93"
(2,360.42mm)
10.24"
(260.10mm)
118th Driest
Driest since:
1937
6th Wettest
Wettest since:
1999

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