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 2021

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 2021
1-Month
2.06"
(52.32mm)
2.52"
(64.01mm)
-0.46"
(-11.69mm)
15th Driest
Driest since:
1987
114th Wettest
Wettest since:
1957
Ties: 1910, 1992
Mar–Apr 2021
2-Month
4.57"
(116.08mm)
5.03"
(127.76mm)
-0.46"
(-11.68mm)
35th Driest
Driest since:
1910
94th Wettest
Wettest since:
1973
Ties: 1950, 1992
Feb–Apr 2021
3-Month
6.59"
(167.39mm)
7.16"
(181.86mm)
-0.57"
(-14.47mm)
31st Driest
Driest since:
1910
98th Wettest
Wettest since:
1983
Ties: 1907
Jan–Apr 2021
4-Month
8.68"
(220.47mm)
9.48"
(240.79mm)
-0.80"
(-20.32mm)
27th Driest
Driest since:
1910
102nd Wettest
Wettest since:
1998
Ties: 2009
Dec 2020–Apr 2021
5-Month
10.73"
(272.54mm)
11.82"
(300.23mm)
-1.09"
(-27.69mm)
26th Driest
Driest since:
1931
102nd Wettest
Wettest since:
1983
Nov 2020–Apr 2021
6-Month
12.67"
(321.82mm)
14.05"
(356.87mm)
-1.38"
(-35.05mm)
14th Driest
Driest since:
1977
114th Wettest
Wettest since:
1983
Oct 2020–Apr 2021
7-Month
14.85"
(377.19mm)
16.22"
(411.99mm)
-1.37"
(-34.80mm)
21st Driest
Driest since:
1981
107th Wettest
Wettest since:
1983
Sep 2020–Apr 2021
8-Month
17.29"
(439.17mm)
18.71"
(475.23mm)
-1.42"
(-36.06mm)
26th Driest
Driest since:
1918
102nd Wettest
Wettest since:
2019
Aug 2020–Apr 2021
9-Month
19.71"
(500.63mm)
21.33"
(541.78mm)
-1.62"
(-41.15mm)
25th Driest
Driest since:
1918
103rd Wettest
Wettest since:
2019
Jul 2020–Apr 2021
10-Month
22.65"
(575.31mm)
24.12"
(612.65mm)
-1.47"
(-37.34mm)
30th Driest
Driest since:
1931
98th Wettest
Wettest since:
2019
Jun 2020–Apr 2021
11-Month
25.38"
(644.65mm)
27.04"
(686.82mm)
-1.66"
(-42.17mm)
25th Driest
Driest since:
1931
103rd Wettest
Wettest since:
2019
Ties: 1910, 1964
May 2020–Apr 2021
12-Month
28.47"
(723.14mm)
29.95"
(760.73mm)
-1.48"
(-37.59mm)
31st Driest
Driest since:
1918
97th Wettest
Wettest since:
2019
Ties: 2002
Nov 2019–Apr 2021
18-Month
43.57"
(1,106.68mm)
44.02"
(1,118.11mm)
-0.45"
(-11.43mm)
50th Driest
Driest since:
1931
77th Wettest
Wettest since:
2020
May 2019–Apr 2021
24-Month
62.59"
(1,589.79mm)
59.92"
(1,521.97mm)
2.67"
(67.82mm)
98th Driest
Driest since:
1955
29th Wettest
Wettest since:
2020
May 2018–Apr 2021
36-Month
98.85"
(2,510.79mm)
89.88"
(2,282.95mm)
8.97"
(227.84mm)
117th Driest
Driest since:
1955
9th Wettest
Wettest since:
2020
May 2017–Apr 2021
48-Month
129.26"
(3,283.20mm)
119.77"
(3,042.16mm)
9.49"
(241.04mm)
115th Driest
Driest since:
1956
10th Wettest
Wettest since:
2019
May 2016–Apr 2021
60-Month
162.37"
(4,124.20mm)
149.63"
(3,800.60mm)
12.74"
(323.60mm)
118th Driest
Driest since:
1957
6th Wettest
Wettest since:
2020

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