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, October 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
October 2021
1-Month 		3.15"
(80.01mm)		 2.16"
(54.86mm)		 0.99"
(25.15mm)		 120th Driest
Driest since:
 1952
9th Wettest
Wettest since:
 2009
Sep–Oct 2021
2-Month 		5.54"
(140.72mm)		 4.65"
(118.11mm)		 0.89"
(22.61mm)		 107th Driest
Driest since:
 1952
22nd Wettest
Wettest since:
 2018
Aug–Oct 2021
3-Month 		8.68"
(220.47mm)		 7.27"
(184.66mm)		 1.41"
(35.81mm)		 119th Driest
Driest since:
 1952
10th Wettest
Wettest since:
 2018
Jul–Oct 2021
4-Month 		12.09"
(307.09mm)		 10.05"
(255.27mm)		 2.04"
(51.82mm)		 124th Driest
Driest since:
 1952
5th Wettest
Wettest since:
 1941
Jun–Oct 2021
5-Month 		15.06"
(382.52mm)		 12.97"
(329.44mm)		 2.09"
(53.08mm)		 124th Driest
Driest since:
 1952
5th Wettest
Wettest since:
 1941
May–Oct 2021
6-Month 		18.04"
(458.22mm)		 15.88"
(403.35mm)		 2.16"
(54.87mm)		 121st Driest
Driest since:
 1952
8th Wettest
Wettest since:
 1941
Apr–Oct 2021
7-Month 		20.10"
(510.54mm)		 18.40"
(467.36mm)		 1.70"
(43.18mm)		 108th Driest
Driest since:
 1952
21st Wettest
Wettest since:
 1941
Ties: 1928
Mar–Oct 2021
8-Month 		22.61"
(574.29mm)		 20.91"
(531.11mm)		 1.70"
(43.18mm)		 106th Driest
Driest since:
 1956
23rd Wettest
Wettest since:
 2019
Feb–Oct 2021
9-Month 		24.63"
(625.60mm)		 23.04"
(585.22mm)		 1.59"
(40.38mm)		 100th Driest
Driest since:
 1934
29th Wettest
Wettest since:
 2019
Jan–Oct 2021
10-Month 		26.72"
(678.69mm)		 25.36"
(644.14mm)		 1.36"
(34.55mm)		 97th Driest
Driest since:
 1934
32nd Wettest
Wettest since:
 2019
Dec 2020–Oct 2021
11-Month 		28.77"
(730.76mm)		 27.70"
(703.58mm)		 1.07"
(27.18mm)		 81st Driest
Driest since:
 1931
47th Wettest
Wettest since:
 2019
Ties: 1946
Nov 2020–Oct 2021
12-Month 		30.71"
(780.03mm)		 29.93"
(760.22mm)		 0.78"
(19.81mm)		 77th Driest
Driest since:
 1934
51st Wettest
Wettest since:
 2019
May 2020–Oct 2021
18-Month 		46.51"
(1,181.35mm)		 45.83"
(1,164.08mm)		 0.68"
(17.27mm)		 70th Driest
Driest since:
 1931
58th Wettest
Wettest since:
 2019
Nov 2019–Oct 2021
24-Month 		61.61"
(1,564.89mm)		 59.90"
(1,521.46mm)		 1.71"
(43.43mm)		 85th Driest
Driest since:
 1931
42nd Wettest
Wettest since:
 2019
Nov 2018–Oct 2021
36-Month 		97.88"
(2,486.15mm)		 89.86"
(2,282.44mm)		 8.02"
(203.71mm)		 116th Driest
Driest since:
 1956
10th Wettest
Wettest since:
 2019
Ties: 1985
Nov 2017–Oct 2021
48-Month 		129.78"
(3,296.41mm)		 119.78"
(3,042.41mm)		 10.00"
(254.00mm)		 118th Driest
Driest since:
 1956
7th Wettest
Wettest since:
 2019
Nov 2016–Oct 2021
60-Month 		163.35"
(4,149.09mm)		 149.66"
(3,801.36mm)		 13.69"
(347.73mm)		 121st Driest
Driest since:
 1934
3rd Wettest
Wettest since:
 2019

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