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 1938

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 1938
1-Month
3.24"
(82.30mm)
2.91"
(73.91mm)
0.33"
(8.39mm)
97th Driest
Driest since:
1934
32nd Wettest
Wettest since:
2019
Ties: 1987
Apr–May 1938
2-Month
5.93"
(150.62mm)
5.43"
(137.92mm)
0.50"
(12.70mm)
96th Driest
Driest since:
1934
33rd Wettest
Wettest since:
1957
Ties: 1933
Mar–May 1938
3-Month
9.23"
(234.44mm)
7.94"
(201.68mm)
1.29"
(32.76mm)
113th Driest
Driest since:
1925
16th Wettest
Wettest since:
1957, 1991
Feb–May 1938
4-Month
11.64"
(295.66mm)
10.07"
(255.78mm)
1.57"
(39.88mm)
112th Driest
Driest since:
1925
17th Wettest
Wettest since:
2019
Jan–May 1938
5-Month
13.75"
(349.25mm)
12.39"
(314.71mm)
1.36"
(34.54mm)
113th Driest
Driest since:
1934
16th Wettest
Wettest since:
2019
Dec 1937–May 1938
6-Month
16.18"
(410.97mm)
14.73"
(374.14mm)
1.45"
(36.83mm)
109th Driest
Driest since:
1931
19th Wettest
Wettest since:
2019
Nov 1937–May 1938
7-Month
18.34"
(465.84mm)
16.96"
(430.78mm)
1.38"
(35.06mm)
105th Driest
Driest since:
1934
23rd Wettest
Wettest since:
1983
Oct 1937–May 1938
8-Month
20.95"
(532.13mm)
19.13"
(485.90mm)
1.82"
(46.23mm)
105th Driest
Driest since:
1934
23rd Wettest
Wettest since:
2019
Sep 1937–May 1938
9-Month
22.95"
(582.93mm)
21.62"
(549.15mm)
1.33"
(33.78mm)
96th Driest
Driest since:
1934
32nd Wettest
Wettest since:
2019
Ties: 2003
Aug 1937–May 1938
10-Month
25.50"
(647.70mm)
24.25"
(615.95mm)
1.25"
(31.75mm)
94th Driest
Driest since:
1918
34th Wettest
Wettest since:
2019
Jul 1937–May 1938
11-Month
28.12"
(714.25mm)
27.03"
(686.56mm)
1.09"
(27.69mm)
90th Driest
Driest since:
1931
38th Wettest
Wettest since:
2019
Jun 1937–May 1938
12-Month
31.23"
(793.24mm)
29.95"
(760.73mm)
1.28"
(32.51mm)
90th Driest
Driest since:
1934
38th Wettest
Wettest since:
2019
Dec 1936–May 1938
18-Month
47.05"
(1,195.07mm)
44.70"
(1,135.38mm)
2.35"
(59.69mm)
95th Driest
Driest since:
1931
32nd Wettest
Wettest since:
2019
Jun 1936–May 1938
24-Month
59.69"
(1,516.13mm)
59.92"
(1,521.97mm)
-0.23"
(-5.84mm)
56th Driest
Driest since:
1931
71st Wettest
Wettest since:
2020
Jun 1935–May 1938
36-Month
87.73"
(2,228.34mm)
89.88"
(2,282.95mm)
-2.15"
(-54.61mm)
39th Driest
Driest since:
1955
87th Wettest
Wettest since:
2019
Ties: 1977
Jun 1934–May 1938
48-Month
117.42"
(2,982.47mm)
119.78"
(3,042.41mm)
-2.36"
(-59.94mm)
39th Driest
Driest since:
1956
86th Wettest
Wettest since:
2019
Jun 1933–May 1938
60-Month
141.72"
(3,599.69mm)
149.64"
(3,800.86mm)
-7.92"
(-201.17mm)
9th Driest
Driest since:
1957
115th Wettest
Wettest since:
2020

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