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, April 1940

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
April 1940
1-Month
3.04"
(77.22mm)
2.52"
(64.01mm)
0.52"
(13.21mm)
111th Driest
Driest since:
1987
18th Wettest
Wettest since:
1957
Mar–Apr 1940
2-Month
5.31"
(134.87mm)
5.03"
(127.76mm)
0.28"
(7.11mm)
89th Driest
Driest since:
1910
40th Wettest
Wettest since:
1973
Ties: 1921, 1928
Feb–Apr 1940
3-Month
8.29"
(210.57mm)
7.16"
(181.86mm)
1.13"
(28.71mm)
112th Driest
Driest since:
1910
17th Wettest
Wettest since:
1983
Jan–Apr 1940
4-Month
10.22"
(259.59mm)
9.48"
(240.79mm)
0.74"
(18.80mm)
102nd Driest
Driest since:
1910
27th Wettest
Wettest since:
1998
Dec 1939–Apr 1940
5-Month
12.10"
(307.34mm)
11.82"
(300.23mm)
0.28"
(7.11mm)
78th Driest
Driest since:
1931
50th Wettest
Wettest since:
1983
Nov 1939–Apr 1940
6-Month
13.09"
(332.49mm)
14.05"
(356.87mm)
-0.96"
(-24.38mm)
32nd Driest
Driest since:
1977
96th Wettest
Wettest since:
1983
Oct 1939–Apr 1940
7-Month
14.69"
(373.13mm)
16.22"
(411.99mm)
-1.53"
(-38.86mm)
20th Driest
Driest since:
1981
108th Wettest
Wettest since:
1983
Sep 1939–Apr 1940
8-Month
16.31"
(414.27mm)
18.71"
(475.23mm)
-2.40"
(-60.96mm)
10th Driest
Driest since:
1918
118th Wettest
Wettest since:
2019
Aug 1939–Apr 1940
9-Month
19.02"
(483.11mm)
21.33"
(541.78mm)
-2.31"
(-58.67mm)
11th Driest
Driest since:
1918
117th Wettest
Wettest since:
2019
Jul 1939–Apr 1940
10-Month
21.38"
(543.05mm)
24.12"
(612.65mm)
-2.74"
(-69.60mm)
10th Driest
Driest since:
1931
118th Wettest
Wettest since:
2019
Jun 1939–Apr 1940
11-Month
24.70"
(627.38mm)
27.04"
(686.82mm)
-2.34"
(-59.44mm)
15th Driest
Driest since:
1931
113th Wettest
Wettest since:
2019
May 1939–Apr 1940
12-Month
26.90"
(683.26mm)
29.95"
(760.73mm)
-3.05"
(-77.47mm)
13th Driest
Driest since:
1918
115th Wettest
Wettest since:
2019
Nov 1938–Apr 1940
18-Month
40.27"
(1,022.86mm)
44.02"
(1,118.11mm)
-3.75"
(-95.25mm)
17th Driest
Driest since:
1931
110th Wettest
Wettest since:
2020
May 1938–Apr 1940
24-Month
55.78"
(1,416.81mm)
59.92"
(1,521.97mm)
-4.14"
(-105.16mm)
16th Driest
Driest since:
1955
111th Wettest
Wettest since:
2020
May 1937–Apr 1940
36-Month
86.10"
(2,186.94mm)
89.88"
(2,282.95mm)
-3.78"
(-96.01mm)
24th Driest
Driest since:
1955
102nd Wettest
Wettest since:
2020
May 1936–Apr 1940
48-Month
114.48"
(2,907.79mm)
119.77"
(3,042.16mm)
-5.29"
(-134.37mm)
14th Driest
Driest since:
1956
111th Wettest
Wettest since:
2019
May 1935–Apr 1940
60-Month
143.99"
(3,657.35mm)
149.63"
(3,800.60mm)
-5.64"
(-143.25mm)
17th Driest
Driest since:
1957
107th Wettest
Wettest since:
2020

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