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 1939

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 1939
1-Month
1.60"
(40.64mm)
2.16"
(54.86mm)
-0.56"
(-14.22mm)
20th Driest
Driest since:
1952
109th Wettest
Wettest since:
2009
Sep–Oct 1939
2-Month
3.22"
(81.79mm)
4.65"
(118.11mm)
-1.43"
(-36.32mm)
6th Driest
Driest since:
1952
123rd Wettest
Wettest since:
2018
Aug–Oct 1939
3-Month
5.93"
(150.62mm)
7.27"
(184.66mm)
-1.34"
(-34.04mm)
11th Driest
Driest since:
1952
118th Wettest
Wettest since:
2018
Jul–Oct 1939
4-Month
8.29"
(210.57mm)
10.05"
(255.27mm)
-1.76"
(-44.70mm)
5th Driest
Driest since:
1952
124th Wettest
Wettest since:
1941
Jun–Oct 1939
5-Month
11.61"
(294.89mm)
12.97"
(329.44mm)
-1.36"
(-34.55mm)
18th Driest
Driest since:
1952
111th Wettest
Wettest since:
1941
May–Oct 1939
6-Month
13.81"
(350.77mm)
15.88"
(403.35mm)
-2.07"
(-52.58mm)
10th Driest
Driest since:
1952
119th Wettest
Wettest since:
1941
Apr–Oct 1939
7-Month
15.97"
(405.64mm)
18.40"
(467.36mm)
-2.43"
(-61.72mm)
9th Driest
Driest since:
1952
120th Wettest
Wettest since:
1941
Mar–Oct 1939
8-Month
18.04"
(458.22mm)
20.91"
(531.11mm)
-2.87"
(-72.89mm)
9th Driest
Driest since:
1956
120th Wettest
Wettest since:
2019
Feb–Oct 1939
9-Month
20.97"
(532.64mm)
23.04"
(585.22mm)
-2.07"
(-52.58mm)
16th Driest
Driest since:
1934
113th Wettest
Wettest since:
2019
Jan–Oct 1939
10-Month
23.46"
(595.88mm)
25.36"
(644.14mm)
-1.90"
(-48.26mm)
18th Driest
Driest since:
1934
111th Wettest
Wettest since:
2019
Dec 1938–Oct 1939
11-Month
25.17"
(639.32mm)
27.70"
(703.58mm)
-2.53"
(-64.26mm)
13th Driest
Driest since:
1931
115th Wettest
Wettest since:
2019
Nov 1938–Oct 1939
12-Month
27.18"
(690.37mm)
29.93"
(760.22mm)
-2.75"
(-69.85mm)
17th Driest
Driest since:
1934
111th Wettest
Wettest since:
2019
May 1938–Oct 1939
18-Month
42.69"
(1,084.33mm)
45.83"
(1,164.08mm)
-3.14"
(-79.75mm)
19th Driest
Driest since:
1931
109th Wettest
Wettest since:
2019
Nov 1937–Oct 1939
24-Month
57.79"
(1,467.87mm)
59.90"
(1,521.46mm)
-2.11"
(-53.59mm)
31st Driest
Driest since:
1931
96th Wettest
Wettest since:
2019
Nov 1936–Oct 1939
36-Month
87.64"
(2,226.06mm)
89.86"
(2,282.44mm)
-2.22"
(-56.38mm)
36th Driest
Driest since:
1956
90th Wettest
Wettest since:
2019
Nov 1935–Oct 1939
48-Month
114.80"
(2,915.92mm)
119.78"
(3,042.41mm)
-4.98"
(-126.49mm)
15th Driest
Driest since:
1956
110th Wettest
Wettest since:
2019
Nov 1934–Oct 1939
60-Month
145.39"
(3,692.91mm)
149.66"
(3,801.36mm)
-4.27"
(-108.45mm)
26th Driest
Driest since:
1934
98th Wettest
Wettest since:
2019

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