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, July 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
July 2021
1-Month
3.40"
(86.36mm)
2.78"
(70.61mm)
0.62"
(15.75mm)
123rd Driest
Driest since:
1930
6th Wettest
Wettest since:
1950, 1958
Jun–Jul 2021
2-Month
6.37"
(161.80mm)
5.70"
(144.78mm)
0.67"
(17.02mm)
109th Driest
Driest since:
1930
20th Wettest
Wettest since:
1928
May–Jul 2021
3-Month
9.36"
(237.74mm)
8.62"
(218.95mm)
0.74"
(18.79mm)
103rd Driest
Driest since:
1988
26th Wettest
Wettest since:
2015
Ties: 2003
Apr–Jul 2021
4-Month
11.42"
(290.07mm)
11.13"
(282.70mm)
0.29"
(7.37mm)
70th Driest
Driest since:
1934
59th Wettest
Wettest since:
2015
Mar–Jul 2021
5-Month
13.93"
(353.82mm)
13.64"
(346.46mm)
0.29"
(7.36mm)
70th Driest
Driest since:
1936
59th Wettest
Wettest since:
1973
Feb–Jul 2021
6-Month
15.95"
(405.13mm)
15.78"
(400.81mm)
0.17"
(4.32mm)
65th Driest
Driest since:
1934
64th Wettest
Wettest since:
2019
Jan–Jul 2021
7-Month
18.04"
(458.22mm)
18.09"
(459.49mm)
-0.05"
(-1.27mm)
60th Driest
Driest since:
1934
69th Wettest
Wettest since:
2019
Dec 2020–Jul 2021
8-Month
20.09"
(510.29mm)
20.44"
(519.18mm)
-0.35"
(-8.89mm)
47th Driest
Driest since:
1931
81st Wettest
Wettest since:
2019
Ties: 1920
Nov 2020–Jul 2021
9-Month
22.03"
(559.56mm)
22.66"
(575.56mm)
-0.63"
(-16.00mm)
43rd Driest
Driest since:
1934
85th Wettest
Wettest since:
2019
Oct 2020–Jul 2021
10-Month
24.21"
(614.93mm)
24.83"
(630.68mm)
-0.62"
(-15.75mm)
43rd Driest
Driest since:
1934
85th Wettest
Wettest since:
2019
Sep 2020–Jul 2021
11-Month
26.65"
(676.91mm)
27.33"
(694.18mm)
-0.68"
(-17.27mm)
44th Driest
Driest since:
1934
84th Wettest
Wettest since:
2019
Aug 2020–Jul 2021
12-Month
29.07"
(738.38mm)
29.95"
(760.73mm)
-0.88"
(-22.35mm)
41st Driest
Driest since:
1918
87th Wettest
Wettest since:
2019
Feb 2020–Jul 2021
18-Month
45.66"
(1,159.76mm)
45.74"
(1,161.80mm)
-0.08"
(-2.04mm)
56th Driest
Driest since:
1931
72nd Wettest
Wettest since:
2019
Aug 2019–Jul 2021
24-Month
61.35"
(1,558.29mm)
59.92"
(1,521.97mm)
1.43"
(36.32mm)
78th Driest
Driest since:
1918
49th Wettest
Wettest since:
2020
Aug 2018–Jul 2021
36-Month
99.18"
(2,519.17mm)
89.88"
(2,282.95mm)
9.30"
(236.22mm)
120th Driest
Driest since:
1956
6th Wettest
Wettest since:
2019
Aug 2017–Jul 2021
48-Month
129.39"
(3,286.51mm)
119.78"
(3,042.41mm)
9.61"
(244.10mm)
116th Driest
Driest since:
1956
9th Wettest
Wettest since:
2019
Aug 2016–Jul 2021
60-Month
163.26"
(4,146.80mm)
149.64"
(3,800.86mm)
13.62"
(345.94mm)
120th Driest
Driest since:
1934
4th Wettest
Wettest since:
2019

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