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.

West Climate Region

Precipitation Rankings, May 2015

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 2015
1-Month
1.42"
(36.07mm)
0.92"
(23.37mm)
0.50"
(12.70mm)
107th Driest
Driest since:
1924
22nd Wettest
Wettest since:
1998
Apr–May 2015
2-Month
2.33"
(59.18mm)
2.26"
(57.40mm)
0.07"
(1.78mm)
76th Driest
Driest since:
1909
53rd Wettest
Wettest since:
1896
Ties: 1944, 2000
Mar–May 2015
3-Month
2.95"
(74.93mm)
4.59"
(116.59mm)
-1.64"
(-41.66mm)
25th Driest
Driest since:
2008
104th Wettest
Wettest since:
1995
Feb–May 2015
4-Month
4.87"
(123.70mm)
7.31"
(185.67mm)
-2.44"
(-61.97mm)
25th Driest
Driest since:
1997
104th Wettest
Wettest since:
1998
Jan–May 2015
5-Month
5.46"
(138.68mm)
10.29"
(261.37mm)
-4.83"
(-122.69mm)
9th Driest
Driest since:
2022
120th Wettest
Wettest since:
1998
Ties: 1947
Dec 2014–May 2015
6-Month
9.71"
(246.63mm)
12.84"
(326.14mm)
-3.13"
(-79.51mm)
32nd Driest
Driest since:
1924
96th Wettest
Wettest since:
1995
Nov 2014–May 2015
7-Month
11.09"
(281.69mm)
14.71"
(373.63mm)
-3.62"
(-91.94mm)
25th Driest
Driest since:
1977
103rd Wettest
Wettest since:
1995
Oct 2014–May 2015
8-Month
11.76"
(298.70mm)
15.74"
(399.80mm)
-3.98"
(-101.10mm)
26th Driest
Driest since:
1977
102nd Wettest
Wettest since:
1983
Ties: 1939
Sep 2014–May 2015
9-Month
12.67"
(321.82mm)
16.23"
(412.24mm)
-3.56"
(-90.42mm)
33rd Driest
Driest since:
2021
95th Wettest
Wettest since:
1983
Aug 2014–May 2015
10-Month
13.55"
(344.17mm)
16.62"
(422.15mm)
-3.07"
(-77.98mm)
39th Driest
Driest since:
2021
89th Wettest
Wettest since:
1983
Jul 2014–May 2015
11-Month
14.00"
(355.60mm)
16.95"
(430.53mm)
-2.95"
(-74.93mm)
44th Driest
Driest since:
2021
84th Wettest
Wettest since:
1983
Jun 2014–May 2015
12-Month
14.08"
(357.63mm)
17.44"
(442.98mm)
-3.36"
(-85.35mm)
38th Driest
Driest since:
2021
90th Wettest
Wettest since:
1983
Dec 2013–May 2015
18-Month
21.78"
(553.21mm)
30.25"
(768.35mm)
-8.47"
(-215.14mm)
9th Driest
Driest since:
1977
118th Wettest
Wettest since:
1983
Jun 2013–May 2015
24-Month
25.27"
(641.86mm)
34.89"
(886.21mm)
-9.62"
(-244.35mm)
7th Driest
Driest since:
2022
120th Wettest
Wettest since:
1983
Jun 2012–May 2015
36-Month
38.11"
(967.99mm)
52.30"
(1,328.42mm)
-14.19"
(-360.43mm)
5th Driest
Driest since:
2022
121st Wettest
Wettest since:
1984
Jun 2011–May 2015
48-Month
50.83"
(1,291.08mm)
69.56"
(1,766.82mm)
-18.73"
(-475.74mm)
1st Driest
Driest since:
2015
124th Wettest
Wettest since:
1998
Jun 2010–May 2015
60-Month
72.49"
(1,841.25mm)
86.83"
(2,205.48mm)
-14.34"
(-364.23mm)
9th Driest
Driest since:
1933
115th Wettest
Wettest since:
1999

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