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, September 2020

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 2020
1-Month 		2.44"
(61.98mm)		 2.49"
(63.25mm)		 -0.05"
(-1.27mm)		 53rd Driest
Driest since:
 1956
76th Wettest
Wettest since:
 1986
Ties: 1918, 1920, 1966, 1978
Aug–Sep 2020
2-Month 		4.86"
(123.44mm)		 5.11"
(129.79mm)		 -0.25"
(-6.35mm)		 42nd Driest
Driest since:
 1956
87th Wettest
Wettest since:
 1977
Ties: 1995, 2001
Jul–Sep 2020
3-Month 		7.80"
(198.12mm)		 7.88"
(200.15mm)		 -0.08"
(-2.03mm)		 59th Driest
Driest since:
 1930
70th Wettest
Wettest since:
 1915
Ties: 1914
Jun–Sep 2020
4-Month 		10.53"
(267.46mm)		 10.81"
(274.57mm)		 -0.28"
(-7.11mm)		 44th Driest
Driest since:
 1930
85th Wettest
Wettest since:
 1915
May–Sep 2020
5-Month 		13.62"
(345.95mm)		 13.72"
(348.49mm)		 -0.10"
(-2.54mm)		 54th Driest
Driest since:
 1956
75th Wettest
Wettest since:
 1915
Ties: 1999
Apr–Sep 2020
6-Month 		16.14"
(409.96mm)		 16.24"
(412.50mm)		 -0.10"
(-2.54mm)		 56th Driest
Driest since:
 1956
73rd Wettest
Wettest since:
 1915
Mar–Sep 2020
7-Month 		19.00"
(482.60mm)		 18.75"
(476.25mm)		 0.25"
(6.35mm)		 68th Driest
Driest since:
 1956
61st Wettest
Wettest since:
 1973
Ties: 1929
Feb–Sep 2020
8-Month 		21.45"
(544.83mm)		 20.88"
(530.35mm)		 0.57"
(14.48mm)		 76th Driest
Driest since:
 1930
53rd Wettest
Wettest since:
 2019
Ties: 1992
Jan–Sep 2020
9-Month 		24.21"
(614.93mm)		 23.20"
(589.28mm)		 1.01"
(25.65mm)		 92nd Driest
Driest since:
 1934
37th Wettest
Wettest since:
 2019
Dec 2019–Sep 2020
10-Month 		26.78"
(680.21mm)		 25.54"
(648.72mm)		 1.24"
(31.49mm)		 90th Driest
Driest since:
 1931
38th Wettest
Wettest since:
 2019
Nov 2019–Sep 2020
11-Month 		28.72"
(729.49mm)		 27.77"
(705.36mm)		 0.95"
(24.13mm)		 83rd Driest
Driest since:
 1934
45th Wettest
Wettest since:
 2019
Oct 2019–Sep 2020
12-Month 		31.91"
(810.51mm)		 29.94"
(760.48mm)		 1.97"
(50.03mm)		 99th Driest
Driest since:
 1934
29th Wettest
Wettest since:
 2019
Apr 2019–Sep 2020
18-Month 		50.95"
(1,294.13mm)		 46.20"
(1,173.48mm)		 4.75"
(120.65mm)		 119th Driest
Driest since:
 1931
9th Wettest
Wettest since:
 2019
Oct 2018–Sep 2020
24-Month 		68.42"
(1,737.87mm)		 59.92"
(1,521.97mm)		 8.50"
(215.90mm)		 126th Driest
Driest since:
 1918
1st Wettest
Wettest to Date
 2020
Oct 2017–Sep 2020
36-Month 		99.49"
(2,527.05mm)		 89.87"
(2,282.70mm)		 9.62"
(244.35mm)		 122nd Driest
Driest since:
 1956
4th Wettest
Wettest since:
 2019
Oct 2016–Sep 2020
48-Month 		132.85"
(3,374.39mm)		 119.78"
(3,042.41mm)		 13.07"
(331.98mm)		 123rd Driest
Driest since:
 1956
2nd Wettest
Wettest since:
 2019
Oct 2015–Sep 2020
60-Month 		167.72"
(4,260.09mm)		 149.66"
(3,801.36mm)		 18.06"
(458.73mm)		 123rd Driest
Driest since:
 1956
1st Wettest
Wettest to Date
 2020

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