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 2019

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 2019
1-Month
4.47"
(113.54mm)
2.91"
(73.91mm)
1.56"
(39.63mm)
128th Driest
Driest since:
1934
1st Wettest
Wettest to Date
2019
Apr–May 2019
2-Month
7.68"
(195.07mm)
5.43"
(137.92mm)
2.25"
(57.15mm)
127th Driest
Driest since:
1934
2nd Wettest
Wettest since:
1957
Mar–May 2019
3-Month
9.92"
(251.97mm)
7.94"
(201.68mm)
1.98"
(50.29mm)
124th Driest
Driest since:
1925
5th Wettest
Wettest since:
1957, 1991
Ties: 1995
Feb–May 2019
4-Month
13.20"
(335.28mm)
10.07"
(255.78mm)
3.13"
(79.50mm)
128th Driest
Driest since:
1925
1st Wettest
Wettest to Date
2019
Jan–May 2019
5-Month
15.76"
(400.30mm)
12.39"
(314.71mm)
3.37"
(85.59mm)
128th Driest
Driest since:
1934
1st Wettest
Wettest to Date
2019
Dec 2018–May 2019
6-Month
19.01"
(482.85mm)
14.73"
(374.14mm)
4.28"
(108.71mm)
127th Driest
Driest since:
1931
1st Wettest
Wettest to Date
2019
Nov 2018–May 2019
7-Month
21.72"
(551.69mm)
16.96"
(430.78mm)
4.76"
(120.91mm)
126th Driest
Driest since:
1934
2nd Wettest
Wettest since:
1983
Oct 2018–May 2019
8-Month
25.15"
(638.81mm)
19.13"
(485.90mm)
6.02"
(152.91mm)
127th Driest
Driest since:
1934
1st Wettest
Wettest to Date
2019
Sep 2018–May 2019
9-Month
28.72"
(729.49mm)
21.62"
(549.15mm)
7.10"
(180.34mm)
127th Driest
Driest since:
1934
1st Wettest
Wettest to Date
2019
Aug 2018–May 2019
10-Month
31.70"
(805.18mm)
24.25"
(615.95mm)
7.45"
(189.23mm)
127th Driest
Driest since:
1918
1st Wettest
Wettest to Date
2019
Jul 2018–May 2019
11-Month
34.56"
(877.82mm)
27.03"
(686.56mm)
7.53"
(191.26mm)
127th Driest
Driest since:
1931
1st Wettest
Wettest to Date
2019
Jun 2018–May 2019
12-Month
37.71"
(957.83mm)
29.95"
(760.73mm)
7.76"
(197.10mm)
127th Driest
Driest since:
1934
1st Wettest
Wettest to Date
2019
Dec 2017–May 2019
18-Month
52.00"
(1,320.80mm)
44.70"
(1,135.38mm)
7.30"
(185.42mm)
126th Driest
Driest since:
1931
1st Wettest
Wettest to Date
2019
Jun 2017–May 2019
24-Month
67.78"
(1,721.61mm)
59.92"
(1,521.97mm)
7.86"
(199.64mm)
121st Driest
Driest since:
1931
6th Wettest
Wettest since:
2020
Jun 2016–May 2019
36-Month
101.18"
(2,569.97mm)
89.88"
(2,282.95mm)
11.30"
(287.02mm)
125th Driest
Driest since:
1955
1st Wettest
Wettest to Date
2019
Jun 2015–May 2019
48-Month
135.76"
(3,448.30mm)
119.78"
(3,042.41mm)
15.98"
(405.89mm)
124th Driest
Driest since:
1956
1st Wettest
Wettest to Date
2019
Jun 2014–May 2019
60-Month
167.90"
(4,264.66mm)
149.64"
(3,800.86mm)
18.26"
(463.80mm)
122nd Driest
Driest since:
1957
2nd Wettest
Wettest to Date
2020

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