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 1921

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 1921
1-Month
2.55"
(64.77mm)
2.91"
(73.91mm)
-0.36"
(-9.14mm)
27th Driest
Driest since:
1934
102nd Wettest
Wettest since:
2019
Ties: 1985
Apr–May 1921
2-Month
5.34"
(135.64mm)
5.43"
(137.92mm)
-0.09"
(-2.28mm)
63rd Driest
Driest since:
1934
66th Wettest
Wettest since:
1957
Ties: 1959
Mar–May 1921
3-Month
7.86"
(199.64mm)
7.94"
(201.68mm)
-0.08"
(-2.04mm)
61st Driest
Driest since:
1925
68th Wettest
Wettest since:
1957, 1991
Feb–May 1921
4-Month
9.63"
(244.60mm)
10.07"
(255.78mm)
-0.44"
(-11.18mm)
48th Driest
Driest since:
1925
81st Wettest
Wettest since:
2019
Jan–May 1921
5-Month
11.74"
(298.20mm)
12.39"
(314.71mm)
-0.65"
(-16.51mm)
41st Driest
Driest since:
1934
88th Wettest
Wettest since:
2019
Dec 1920–May 1921
6-Month
14.49"
(368.05mm)
14.73"
(374.14mm)
-0.24"
(-6.09mm)
56th Driest
Driest since:
1931
72nd Wettest
Wettest since:
2019
Nov 1920–May 1921
7-Month
16.75"
(425.45mm)
16.96"
(430.78mm)
-0.21"
(-5.33mm)
59th Driest
Driest since:
1934
69th Wettest
Wettest since:
1983
Ties: 1900
Oct 1920–May 1921
8-Month
18.92"
(480.57mm)
19.13"
(485.90mm)
-0.21"
(-5.33mm)
55th Driest
Driest since:
1934
73rd Wettest
Wettest since:
2019
Sep 1920–May 1921
9-Month
21.36"
(542.54mm)
21.62"
(549.15mm)
-0.26"
(-6.61mm)
58th Driest
Driest since:
1934
70th Wettest
Wettest since:
2019
Aug 1920–May 1921
10-Month
24.76"
(628.90mm)
24.25"
(615.95mm)
0.51"
(12.95mm)
72nd Driest
Driest since:
1918
56th Wettest
Wettest since:
2019
Jul 1920–May 1921
11-Month
27.46"
(697.48mm)
27.03"
(686.56mm)
0.43"
(10.92mm)
71st Driest
Driest since:
1931
57th Wettest
Wettest since:
2019
Ties: 1947
Jun 1920–May 1921
12-Month
30.35"
(770.89mm)
29.95"
(760.73mm)
0.40"
(10.16mm)
71st Driest
Driest since:
1934
57th Wettest
Wettest since:
2019
Ties: 1962
Dec 1919–May 1921
18-Month
44.85"
(1,139.19mm)
44.70"
(1,135.38mm)
0.15"
(3.81mm)
65th Driest
Driest since:
1931
62nd Wettest
Wettest since:
2019
Ties: 1962
Jun 1919–May 1921
24-Month
61.93"
(1,573.02mm)
59.92"
(1,521.97mm)
2.01"
(51.05mm)
90th Driest
Driest since:
1931
37th Wettest
Wettest since:
2020
Jun 1918–May 1921
36-Month
92.19"
(2,341.63mm)
89.88"
(2,282.95mm)
2.31"
(58.68mm)
85th Driest
Driest since:
1955
41st Wettest
Wettest since:
2019
Jun 1917–May 1921
48-Month
117.13"
(2,975.10mm)
119.78"
(3,042.41mm)
-2.65"
(-67.31mm)
36th Driest
Driest since:
1956
89th Wettest
Wettest since:
2019
Jun 1916–May 1921
60-Month
145.69"
(3,700.53mm)
149.64"
(3,800.86mm)
-3.95"
(-100.33mm)
30th Driest
Driest since:
1957
94th Wettest
Wettest since:
2020

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