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, August 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
August 2020
1-Month
2.42"
(61.47mm)
2.62"
(66.55mm)
-0.20"
(-5.08mm)
36th Driest
Driest since:
1929
93rd Wettest
Wettest since:
1977
Ties: 1900, 1998
Jul–Aug 2020
2-Month
5.36"
(136.14mm)
5.40"
(137.16mm)
-0.04"
(-1.02mm)
49th Driest
Driest since:
1930
80th Wettest
Wettest since:
1915
Jun–Aug 2020
3-Month
8.09"
(205.49mm)
8.32"
(211.33mm)
-0.23"
(-5.84mm)
36th Driest
Driest since:
1930
93rd Wettest
Wettest since:
1928
Ties: 1990
May–Aug 2020
4-Month
11.18"
(283.97mm)
11.23"
(285.24mm)
-0.05"
(-1.27mm)
53rd Driest
Driest since:
1936
76th Wettest
Wettest since:
1915
Apr–Aug 2020
5-Month
13.70"
(347.98mm)
13.75"
(349.25mm)
-0.05"
(-1.27mm)
52nd Driest
Driest since:
1934
77th Wettest
Wettest since:
2019
Ties: 1921, 1953
Mar–Aug 2020
6-Month
16.56"
(420.62mm)
16.26"
(413.00mm)
0.30"
(7.62mm)
68th Driest
Driest since:
1936
61st Wettest
Wettest since:
1905
Feb–Aug 2020
7-Month
19.01"
(482.85mm)
18.40"
(467.36mm)
0.61"
(15.49mm)
74th Driest
Driest since:
1934
55th Wettest
Wettest since:
2019
Jan–Aug 2020
8-Month
21.77"
(552.96mm)
20.71"
(526.03mm)
1.06"
(26.93mm)
95th Driest
Driest since:
1934
34th Wettest
Wettest since:
2019
Dec 2019–Aug 2020
9-Month
24.34"
(618.24mm)
23.05"
(585.47mm)
1.29"
(32.77mm)
96th Driest
Driest since:
1931
32nd Wettest
Wettest since:
2019
Ties: 1907
Nov 2019–Aug 2020
10-Month
26.28"
(667.51mm)
25.28"
(642.11mm)
1.00"
(25.40mm)
83rd Driest
Driest since:
1934
45th Wettest
Wettest since:
2019
Oct 2019–Aug 2020
11-Month
29.47"
(748.54mm)
27.45"
(697.23mm)
2.02"
(51.31mm)
102nd Driest
Driest since:
1934
26th Wettest
Wettest since:
2019
Ties: 1938
Sep 2019–Aug 2020
12-Month
31.92"
(810.77mm)
29.94"
(760.48mm)
1.98"
(50.29mm)
100th Driest
Driest since:
1934
28th Wettest
Wettest since:
2019
Mar 2019–Aug 2020
18-Month
50.75"
(1,289.05mm)
46.22"
(1,173.99mm)
4.53"
(115.06mm)
119th Driest
Driest since:
1931
9th Wettest
Wettest since:
2019
Sep 2018–Aug 2020
24-Month
69.55"
(1,766.57mm)
59.92"
(1,521.97mm)
9.63"
(244.60mm)
126th Driest
Driest since:
1918
1st Wettest
Wettest to Date
2020
Sep 2017–Aug 2020
36-Month
99.32"
(2,522.73mm)
89.86"
(2,282.44mm)
9.46"
(240.29mm)
121st Driest
Driest since:
1956
5th Wettest
Wettest since:
2019
Sep 2016–Aug 2020
48-Month
133.14"
(3,381.76mm)
119.77"
(3,042.16mm)
13.37"
(339.60mm)
123rd Driest
Driest since:
1956
2nd Wettest
Wettest since:
2019
Sep 2015–Aug 2020
60-Month
167.40"
(4,251.96mm)
149.64"
(3,800.86mm)
17.76"
(451.10mm)
122nd Driest
Driest since:
1934
2nd Wettest
Wettest since:
2019

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