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 2021

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 2021
1-Month
2.99"
(75.95mm)
2.91"
(73.91mm)
0.08"
(2.04mm)
72nd Driest
Driest since:
1934
57th Wettest
Wettest since:
2019
Ties: 1927
Apr–May 2021
2-Month
5.05"
(128.27mm)
5.43"
(137.92mm)
-0.38"
(-9.65mm)
39th Driest
Driest since:
1934
90th Wettest
Wettest since:
1957
Ties: 1989
Mar–May 2021
3-Month
7.56"
(192.02mm)
7.94"
(201.68mm)
-0.38"
(-9.66mm)
48th Driest
Driest since:
1925
81st Wettest
Wettest since:
1957, 1991
Feb–May 2021
4-Month
9.58"
(243.33mm)
10.07"
(255.78mm)
-0.49"
(-12.45mm)
42nd Driest
Driest since:
1925
87th Wettest
Wettest since:
2019
Jan–May 2021
5-Month
11.67"
(296.42mm)
12.39"
(314.71mm)
-0.72"
(-18.29mm)
37th Driest
Driest since:
1934
92nd Wettest
Wettest since:
2019
Dec 2020–May 2021
6-Month
13.72"
(348.49mm)
14.73"
(374.14mm)
-1.01"
(-25.65mm)
33rd Driest
Driest since:
1931
95th Wettest
Wettest since:
2019
Nov 2020–May 2021
7-Month
15.66"
(397.76mm)
16.96"
(430.78mm)
-1.30"
(-33.02mm)
27th Driest
Driest since:
1934
101st Wettest
Wettest since:
1983
Ties: 1936
Oct 2020–May 2021
8-Month
17.84"
(453.14mm)
19.13"
(485.90mm)
-1.29"
(-32.76mm)
26th Driest
Driest since:
1934
102nd Wettest
Wettest since:
2019
Sep 2020–May 2021
9-Month
20.28"
(515.11mm)
21.62"
(549.15mm)
-1.34"
(-34.04mm)
30th Driest
Driest since:
1934
98th Wettest
Wettest since:
2019
Aug 2020–May 2021
10-Month
22.70"
(576.58mm)
24.25"
(615.95mm)
-1.55"
(-39.37mm)
27th Driest
Driest since:
1918
101st Wettest
Wettest since:
2019
Jul 2020–May 2021
11-Month
25.64"
(651.26mm)
27.03"
(686.56mm)
-1.39"
(-35.30mm)
31st Driest
Driest since:
1931
97th Wettest
Wettest since:
2019
Jun 2020–May 2021
12-Month
28.37"
(720.60mm)
29.95"
(760.73mm)
-1.58"
(-40.13mm)
30th Driest
Driest since:
1934
98th Wettest
Wettest since:
2019
Ties: 1896
Dec 2019–May 2021
18-Month
44.62"
(1,133.35mm)
44.70"
(1,135.38mm)
-0.08"
(-2.03mm)
59th Driest
Driest since:
1931
68th Wettest
Wettest since:
2019
Jun 2019–May 2021
24-Month
61.11"
(1,552.19mm)
59.92"
(1,521.97mm)
1.19"
(30.22mm)
76th Driest
Driest since:
1931
51st Wettest
Wettest since:
2020
Jun 2018–May 2021
36-Month
98.82"
(2,510.03mm)
89.88"
(2,282.95mm)
8.94"
(227.08mm)
119th Driest
Driest since:
1955
7th Wettest
Wettest since:
2019
Jun 2017–May 2021
48-Month
128.89"
(3,273.81mm)
119.78"
(3,042.41mm)
9.11"
(231.40mm)
113th Driest
Driest since:
1956
12th Wettest
Wettest since:
2019
Jun 2016–May 2021
60-Month
162.29"
(4,122.17mm)
149.64"
(3,800.86mm)
12.65"
(321.31mm)
118th Driest
Driest since:
1957
6th Wettest
Wettest since:
2020

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