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 2018

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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
April 2018
1-Month
2.46"
(62.48mm)
2.52"
(64.01mm)
-0.06"
(-1.53mm)
56th Driest
Driest since:
1987
73rd Wettest
Wettest since:
1957
Ties: 1968
Mar–Apr 2018
2-Month
4.94"
(125.48mm)
5.03"
(127.76mm)
-0.09"
(-2.28mm)
63rd Driest
Driest since:
1910
66th Wettest
Wettest since:
1973
Feb–Apr 2018
3-Month
7.83"
(198.88mm)
7.16"
(181.86mm)
0.67"
(17.02mm)
101st Driest
Driest since:
1910
28th Wettest
Wettest since:
1983
Ties: 2020
Jan–Apr 2018
4-Month
9.68"
(245.87mm)
9.48"
(240.79mm)
0.20"
(5.08mm)
79th Driest
Driest since:
1910
50th Wettest
Wettest since:
1998
Dec 2017–Apr 2018
5-Month
11.27"
(286.26mm)
11.82"
(300.23mm)
-0.55"
(-13.97mm)
39th Driest
Driest since:
1931
89th Wettest
Wettest since:
1983
Ties: 2006
Nov 2017–Apr 2018
6-Month
12.89"
(327.41mm)
14.05"
(356.87mm)
-1.16"
(-29.46mm)
22nd Driest
Driest since:
1977
106th Wettest
Wettest since:
1983
Ties: 1910
Oct 2017–Apr 2018
7-Month
15.49"
(393.45mm)
16.22"
(411.99mm)
-0.73"
(-18.54mm)
39th Driest
Driest since:
1981
89th Wettest
Wettest since:
1983
Ties: 1951
Sep 2017–Apr 2018
8-Month
17.76"
(451.10mm)
18.71"
(475.23mm)
-0.95"
(-24.13mm)
36th Driest
Driest since:
1918
92nd Wettest
Wettest since:
2019
Aug 2017–Apr 2018
9-Month
21.18"
(537.97mm)
21.33"
(541.78mm)
-0.15"
(-3.81mm)
56th Driest
Driest since:
1918
72nd Wettest
Wettest since:
2019
Jul 2017–Apr 2018
10-Month
23.98"
(609.09mm)
24.12"
(612.65mm)
-0.14"
(-3.56mm)
54th Driest
Driest since:
1931
74th Wettest
Wettest since:
2019
Jun 2017–Apr 2018
11-Month
27.05"
(687.07mm)
27.04"
(686.82mm)
0.01"
(0.25mm)
55th Driest
Driest since:
1931
73rd Wettest
Wettest since:
2019
May 2017–Apr 2018
12-Month
30.41"
(772.41mm)
29.95"
(760.73mm)
0.46"
(11.68mm)
69th Driest
Driest since:
1918
59th Wettest
Wettest since:
2019
Ties: 1909
Nov 2016–Apr 2018
18-Month
46.46"
(1,180.08mm)
44.02"
(1,118.11mm)
2.44"
(61.97mm)
101st Driest
Driest since:
1931
26th Wettest
Wettest since:
2020
May 2016–Apr 2018
24-Month
63.52"
(1,613.41mm)
59.92"
(1,521.97mm)
3.60"
(91.44mm)
106th Driest
Driest since:
1955
21st Wettest
Wettest since:
2020
May 2015–Apr 2018
36-Month
99.47"
(2,526.54mm)
89.88"
(2,282.95mm)
9.59"
(243.59mm)
118th Driest
Driest since:
1955
8th Wettest
Wettest since:
2020
May 2014–Apr 2018
48-Month
129.98"
(3,301.49mm)
119.77"
(3,042.16mm)
10.21"
(259.33mm)
116th Driest
Driest since:
1956
9th Wettest
Wettest since:
2019
May 2013–Apr 2018
60-Month
160.90"
(4,086.86mm)
149.63"
(3,800.60mm)
11.27"
(286.26mm)
117th Driest
Driest since:
1957
7th Wettest
Wettest since:
2020

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