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 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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