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 2009

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PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Wettest/Driest
Since
Record
May 2009
1-Month
0.98"
(24.89mm)
0.92"
(23.37mm)
0.06"
(1.52mm)
81st Driest
Driest since:
1924
48th Wettest
Wettest since:
1998
Apr–May 2009
2-Month
1.75"
(44.45mm)
2.26"
(57.40mm)
-0.51"
(-12.95mm)
48th Driest
Driest since:
1909
81st Wettest
Wettest since:
1896
Ties: 1986
Mar–May 2009
3-Month
3.35"
(85.09mm)
4.59"
(116.59mm)
-1.24"
(-31.50mm)
32nd Driest
Driest since:
2008
97th Wettest
Wettest since:
1995
Feb–May 2009
4-Month
6.55"
(166.37mm)
7.31"
(185.67mm)
-0.76"
(-19.30mm)
58th Driest
Driest since:
1997
71st Wettest
Wettest since:
1998
Jan–May 2009
5-Month
7.65"
(194.31mm)
10.29"
(261.37mm)
-2.64"
(-67.06mm)
34th Driest
Driest since:
2022
95th Wettest
Wettest since:
1998
Dec 2008–May 2009
6-Month
9.91"
(251.71mm)
12.84"
(326.14mm)
-2.93"
(-74.43mm)
34th Driest
Driest since:
1924
94th Wettest
Wettest since:
1995
Nov 2008–May 2009
7-Month
11.79"
(299.47mm)
14.71"
(373.63mm)
-2.92"
(-74.16mm)
39th Driest
Driest since:
1977
89th Wettest
Wettest since:
1995
Oct 2008–May 2009
8-Month
12.35"
(313.69mm)
15.74"
(399.80mm)
-3.39"
(-86.11mm)
36th Driest
Driest since:
1977
92nd Wettest
Wettest since:
1983
Sep 2008–May 2009
9-Month
12.43"
(315.72mm)
16.23"
(412.24mm)
-3.80"
(-96.52mm)
27th Driest
Driest since:
2021
101st Wettest
Wettest since:
1983
Aug 2008–May 2009
10-Month
12.57"
(319.28mm)
16.62"
(422.15mm)
-4.05"
(-102.87mm)
27th Driest
Driest since:
2021
101st Wettest
Wettest since:
1983
Jul 2008–May 2009
11-Month
12.79"
(324.87mm)
16.95"
(430.53mm)
-4.16"
(-105.66mm)
24th Driest
Driest since:
2021
104th Wettest
Wettest since:
1983
Jun 2008–May 2009
12-Month
12.91"
(327.91mm)
17.44"
(442.98mm)
-4.53"
(-115.07mm)
20th Driest
Driest since:
2021
108th Wettest
Wettest since:
1983
Ties: 1950
Dec 2007–May 2009
18-Month
23.76"
(603.50mm)
30.25"
(768.35mm)
-6.49"
(-164.85mm)
20th Driest
Driest since:
1977
107th Wettest
Wettest since:
1983
Jun 2007–May 2009
24-Month
26.96"
(684.78mm)
34.89"
(886.21mm)
-7.93"
(-201.43mm)
17th Driest
Driest since:
2022
110th Wettest
Wettest since:
1983
Jun 2006–May 2009
36-Month
37.56"
(954.02mm)
52.30"
(1,328.42mm)
-14.74"
(-374.40mm)
4th Driest
Driest since:
2022
122nd Wettest
Wettest since:
1984
Jun 2005–May 2009
48-Month
59.97"
(1,523.24mm)
69.56"
(1,766.82mm)
-9.59"
(-243.58mm)
21st Driest
Driest since:
2015
104th Wettest
Wettest since:
1998
Jun 2004–May 2009
60-Month
83.41"
(2,118.61mm)
86.83"
(2,205.48mm)
-3.42"
(-86.87mm)
59th Driest
Driest since:
1933
65th Wettest
Wettest since:
1999

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