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 2020

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 2020
1-Month
2.52"
(64.01mm)
2.52"
(64.01mm)
0.00"
(0.00mm)
63rd Driest
Driest since:
1987
66th Wettest
Wettest since:
1957
Ties: 1965, 1982
Mar–Apr 2020
2-Month
5.38"
(136.65mm)
5.03"
(127.76mm)
0.35"
(8.89mm)
93rd Driest
Driest since:
1910
36th Wettest
Wettest since:
1973
Feb–Apr 2020
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: 2018
Jan–Apr 2020
4-Month
10.59"
(268.99mm)
9.47"
(240.54mm)
1.12"
(28.45mm)
111th Driest
Driest since:
1910
18th Wettest
Wettest since:
1998
Dec 2019–Apr 2020
5-Month
13.16"
(334.26mm)
11.82"
(300.23mm)
1.34"
(34.03mm)
111th Driest
Driest since:
1931
17th Wettest
Wettest since:
1983
Nov 2019–Apr 2020
6-Month
15.10"
(383.54mm)
14.05"
(356.87mm)
1.05"
(26.67mm)
101st Driest
Driest since:
1977
27th Wettest
Wettest since:
1983
Ties: 1938
Oct 2019–Apr 2020
7-Month
18.29"
(464.57mm)
16.22"
(411.99mm)
2.07"
(52.58mm)
114th Driest
Driest since:
1981
14th Wettest
Wettest since:
1983
Sep 2019–Apr 2020
8-Month
20.74"
(526.80mm)
18.71"
(475.23mm)
2.03"
(51.57mm)
111th Driest
Driest since:
1918
17th Wettest
Wettest since:
2019
Ties: 1978
Aug 2019–Apr 2020
9-Month
23.52"
(597.41mm)
21.33"
(541.78mm)
2.19"
(55.63mm)
110th Driest
Driest since:
1918
18th Wettest
Wettest since:
2019
Jul 2019–Apr 2020
10-Month
26.28"
(667.51mm)
24.12"
(612.65mm)
2.16"
(54.86mm)
111th Driest
Driest since:
1931
17th Wettest
Wettest since:
2019
Ties: 1903
Jun 2019–Apr 2020
11-Month
29.65"
(753.11mm)
27.04"
(686.82mm)
2.61"
(66.29mm)
114th Driest
Driest since:
1931
14th Wettest
Wettest since:
2019
May 2019–Apr 2020
12-Month
34.12"
(866.65mm)
29.95"
(760.73mm)
4.17"
(105.92mm)
122nd Driest
Driest since:
1918
6th Wettest
Wettest since:
2019
Nov 2018–Apr 2020
18-Month
51.37"
(1,304.80mm)
44.02"
(1,118.11mm)
7.35"
(186.69mm)
126th Driest
Driest since:
1931
1st Wettest
Wettest to Date
2020
May 2018–Apr 2020
24-Month
70.38"
(1,787.65mm)
59.92"
(1,521.97mm)
10.46"
(265.68mm)
126th Driest
Driest since:
1955
1st Wettest
Wettest to Date
2020
May 2017–Apr 2020
36-Month
100.79"
(2,560.07mm)
89.88"
(2,282.95mm)
10.91"
(277.12mm)
125th Driest
Driest since:
1955
1st Wettest
Wettest to Date
2020
May 2016–Apr 2020
48-Month
133.90"
(3,401.06mm)
119.77"
(3,042.16mm)
14.13"
(358.90mm)
123rd Driest
Driest since:
1956
2nd Wettest
Wettest since:
2019
May 2015–Apr 2020
60-Month
169.85"
(4,314.19mm)
149.63"
(3,800.60mm)
20.22"
(513.59mm)
123rd Driest
Driest since:
1957
1st Wettest
Wettest to Date
2020

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