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 2020

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 2020
1-Month
2.18"
(55.37mm)
2.16"
(54.86mm)
0.02"
(0.51mm)
61st Driest
Driest since:
1952
68th Wettest
Wettest since:
2009
Ties: 2008
Sep–Oct 2020
2-Month
4.62"
(117.35mm)
4.65"
(118.11mm)
-0.03"
(-0.76mm)
53rd Driest
Driest since:
1952
76th Wettest
Wettest since:
2018
Ties: 1915, 2011
Aug–Oct 2020
3-Month
7.04"
(178.82mm)
7.27"
(184.66mm)
-0.23"
(-5.84mm)
46th Driest
Driest since:
1952
83rd Wettest
Wettest since:
2018
Ties: 2012
Jul–Oct 2020
4-Month
9.98"
(253.49mm)
10.05"
(255.27mm)
-0.07"
(-1.78mm)
52nd Driest
Driest since:
1952
77th Wettest
Wettest since:
1941
Jun–Oct 2020
5-Month
12.71"
(322.83mm)
12.97"
(329.44mm)
-0.26"
(-6.61mm)
45th Driest
Driest since:
1952
84th Wettest
Wettest since:
1941
May–Oct 2020
6-Month
15.80"
(401.32mm)
15.88"
(403.35mm)
-0.08"
(-2.03mm)
53rd Driest
Driest since:
1952
76th Wettest
Wettest since:
1941
Apr–Oct 2020
7-Month
18.32"
(465.33mm)
18.40"
(467.36mm)
-0.08"
(-2.03mm)
54th Driest
Driest since:
1952
75th Wettest
Wettest since:
1941
Mar–Oct 2020
8-Month
21.18"
(537.97mm)
20.91"
(531.11mm)
0.27"
(6.86mm)
65th Driest
Driest since:
1956
64th Wettest
Wettest since:
2019
Feb–Oct 2020
9-Month
23.63"
(600.20mm)
23.04"
(585.22mm)
0.59"
(14.98mm)
76th Driest
Driest since:
1934
53rd Wettest
Wettest since:
2019
Jan–Oct 2020
10-Month
26.39"
(670.31mm)
25.36"
(644.14mm)
1.03"
(26.17mm)
88th Driest
Driest since:
1934
41st Wettest
Wettest since:
2019
Dec 2019–Oct 2020
11-Month
28.96"
(735.58mm)
27.70"
(703.58mm)
1.26"
(32.00mm)
88th Driest
Driest since:
1931
40th Wettest
Wettest since:
2019
Ties: 1900
Nov 2019–Oct 2020
12-Month
30.90"
(784.86mm)
29.93"
(760.22mm)
0.97"
(24.64mm)
82nd Driest
Driest since:
1934
46th Wettest
Wettest since:
2019
Ties: 1920
May 2019–Oct 2020
18-Month
49.92"
(1,267.97mm)
45.83"
(1,164.08mm)
4.09"
(103.89mm)
117th Driest
Driest since:
1931
11th Wettest
Wettest since:
2019
Nov 2018–Oct 2020
24-Month
67.17"
(1,706.12mm)
59.90"
(1,521.46mm)
7.27"
(184.66mm)
122nd Driest
Driest since:
1931
5th Wettest
Wettest since:
2019
Nov 2017–Oct 2020
36-Month
99.07"
(2,516.38mm)
89.86"
(2,282.44mm)
9.21"
(233.94mm)
119th Driest
Driest since:
1956
7th Wettest
Wettest since:
2019
Nov 2016–Oct 2020
48-Month
132.64"
(3,369.06mm)
119.78"
(3,042.41mm)
12.86"
(326.65mm)
123rd Driest
Driest since:
1956
2nd Wettest
Wettest since:
2019
Nov 2015–Oct 2020
60-Month
167.00"
(4,241.80mm)
149.66"
(3,801.36mm)
17.34"
(440.44mm)
122nd Driest
Driest since:
1934
2nd Wettest
Wettest since:
2019

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