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

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
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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