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 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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