National Rankings

National Data Info
Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Contiguous U.S.

Precipitation Rankings, May 2009

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 2009
1-Month
3.31"
(84.07mm)
2.91"
(73.91mm)
0.40"
(10.16mm)
102nd Driest
Driest since:
1934
27th Wettest
Wettest since:
2019
Apr–May 2009
2-Month
6.14"
(155.96mm)
5.43"
(137.92mm)
0.71"
(18.04mm)
105th Driest
Driest since:
1934
24th Wettest
Wettest since:
1957
Mar–May 2009
3-Month
8.84"
(224.54mm)
7.94"
(201.68mm)
0.90"
(22.86mm)
103rd Driest
Driest since:
1925
26th Wettest
Wettest since:
1957, 1991
Feb–May 2009
4-Month
10.39"
(263.91mm)
10.07"
(255.78mm)
0.32"
(8.13mm)
82nd Driest
Driest since:
1925
47th Wettest
Wettest since:
2019
Jan–May 2009
5-Month
11.99"
(304.55mm)
12.39"
(314.71mm)
-0.40"
(-10.16mm)
53rd Driest
Driest since:
1934
76th Wettest
Wettest since:
2019
Ties: 1960
Dec 2008–May 2009
6-Month
14.83"
(376.68mm)
14.73"
(374.14mm)
0.10"
(2.54mm)
66th Driest
Driest since:
1931
62nd Wettest
Wettest since:
2019
Nov 2008–May 2009
7-Month
16.78"
(426.21mm)
16.96"
(430.78mm)
-0.18"
(-4.57mm)
61st Driest
Driest since:
1934
67th Wettest
Wettest since:
1983
Oct 2008–May 2009
8-Month
18.96"
(481.58mm)
19.13"
(485.90mm)
-0.17"
(-4.32mm)
58th Driest
Driest since:
1934
70th Wettest
Wettest since:
2019
Ties: 1965
Sep 2008–May 2009
9-Month
21.64"
(549.66mm)
21.62"
(549.15mm)
0.02"
(0.51mm)
64th Driest
Driest since:
1934
64th Wettest
Wettest since:
2019
Aug 2008–May 2009
10-Month
24.69"
(627.13mm)
24.25"
(615.95mm)
0.44"
(11.18mm)
71st Driest
Driest since:
1918
57th Wettest
Wettest since:
2019
Jul 2008–May 2009
11-Month
27.49"
(698.25mm)
27.03"
(686.56mm)
0.46"
(11.69mm)
73rd Driest
Driest since:
1931
55th Wettest
Wettest since:
2019
Jun 2008–May 2009
12-Month
30.49"
(774.45mm)
29.95"
(760.73mm)
0.54"
(13.72mm)
75th Driest
Driest since:
1934
53rd Wettest
Wettest since:
2019
Dec 2007–May 2009
18-Month
46.20"
(1,173.48mm)
44.70"
(1,135.38mm)
1.50"
(38.10mm)
90th Driest
Driest since:
1931
37th Wettest
Wettest since:
2019
Jun 2007–May 2009
24-Month
60.88"
(1,546.35mm)
59.92"
(1,521.97mm)
0.96"
(24.38mm)
73rd Driest
Driest since:
1931
54th Wettest
Wettest since:
2020
Jun 2006–May 2009
36-Month
90.96"
(2,310.38mm)
89.88"
(2,282.95mm)
1.08"
(27.43mm)
73rd Driest
Driest since:
1955
53rd Wettest
Wettest since:
2019
Ties: 1951
Jun 2005–May 2009
48-Month
119.88"
(3,044.95mm)
119.78"
(3,042.41mm)
0.10"
(2.54mm)
58th Driest
Driest since:
1956
67th Wettest
Wettest since:
2019
Jun 2004–May 2009
60-Month
153.29"
(3,893.57mm)
149.64"
(3,800.86mm)
3.65"
(92.71mm)
85th Driest
Driest since:
1957
39th Wettest
Wettest since:
2020
Ties: 1910

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