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 1987

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1987
1-Month
1.39"
(35.31mm)
0.92"
(23.37mm)
0.47"
(11.94mm)
103rd Driest
Driest since:
1924
26th Wettest
Wettest since:
1998
Ties: 1895, 1908
Apr–May 1987
2-Month
1.87"
(47.50mm)
2.26"
(57.40mm)
-0.39"
(-9.90mm)
54th Driest
Driest since:
1909
75th Wettest
Wettest since:
1896
Mar–May 1987
3-Month
4.56"
(115.82mm)
4.59"
(116.59mm)
-0.03"
(-0.77mm)
72nd Driest
Driest since:
2008
57th Wettest
Wettest since:
1995
Feb–May 1987
4-Month
6.59"
(167.39mm)
7.31"
(185.67mm)
-0.72"
(-18.28mm)
60th Driest
Driest since:
1997
69th Wettest
Wettest since:
1998
Jan–May 1987
5-Month
8.76"
(222.50mm)
10.29"
(261.37mm)
-1.53"
(-38.87mm)
50th Driest
Driest since:
2022
79th Wettest
Wettest since:
1998
Dec 1986–May 1987
6-Month
9.76"
(247.90mm)
12.84"
(326.14mm)
-3.08"
(-78.24mm)
33rd Driest
Driest since:
1924
95th Wettest
Wettest since:
1995
Nov 1986–May 1987
7-Month
10.37"
(263.40mm)
14.71"
(373.63mm)
-4.34"
(-110.23mm)
20th Driest
Driest since:
1977
108th Wettest
Wettest since:
1995
Ties: 2013
Oct 1986–May 1987
8-Month
10.99"
(279.15mm)
15.74"
(399.80mm)
-4.75"
(-120.65mm)
13th Driest
Driest since:
1977
115th Wettest
Wettest since:
1983
Sep 1986–May 1987
9-Month
12.15"
(308.61mm)
16.23"
(412.24mm)
-4.08"
(-103.63mm)
22nd Driest
Driest since:
2021
106th Wettest
Wettest since:
1983
Aug 1986–May 1987
10-Month
12.42"
(315.47mm)
16.62"
(422.15mm)
-4.20"
(-106.68mm)
21st Driest
Driest since:
2021
107th Wettest
Wettest since:
1983
Ties: 1990
Jul 1986–May 1987
11-Month
12.75"
(323.85mm)
16.95"
(430.53mm)
-4.20"
(-106.68mm)
22nd Driest
Driest since:
2021
106th Wettest
Wettest since:
1983
Jun 1986–May 1987
12-Month
12.88"
(327.15mm)
17.44"
(442.98mm)
-4.56"
(-115.83mm)
18th Driest
Driest since:
2021
110th Wettest
Wettest since:
1983
Dec 1985–May 1987
18-Month
28.30"
(718.82mm)
30.25"
(768.35mm)
-1.95"
(-49.53mm)
49th Driest
Driest since:
1977
78th Wettest
Wettest since:
1983
Jun 1985–May 1987
24-Month
34.16"
(867.66mm)
34.89"
(886.21mm)
-0.73"
(-18.55mm)
61st Driest
Driest since:
2022
66th Wettest
Wettest since:
1983
Ties: 1944
Jun 1984–May 1987
36-Month
49.95"
(1,268.73mm)
52.30"
(1,328.42mm)
-2.35"
(-59.69mm)
59th Driest
Driest since:
2022
67th Wettest
Wettest since:
1984
Jun 1983–May 1987
48-Month
69.07"
(1,754.38mm)
69.56"
(1,766.82mm)
-0.49"
(-12.44mm)
69th Driest
Driest since:
2015
56th Wettest
Wettest since:
1998
Jun 1982–May 1987
60-Month
99.55"
(2,528.57mm)
86.83"
(2,205.48mm)
12.72"
(323.09mm)
107th Driest
Driest since:
1933
17th Wettest
Wettest since:
1999

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