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

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  • Record Wettest
PeriodValue1901-2000
Mean		AnomalyRank
(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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