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 1940

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
October 1940
1-Month
1.77"
(44.96mm)
2.16"
(54.86mm)
-0.39"
(-9.90mm)
29th Driest
Driest since:
1952
100th Wettest
Wettest since:
2009
Ties: 1903
Sep–Oct 1940
2-Month
3.77"
(95.76mm)
4.65"
(118.11mm)
-0.88"
(-22.35mm)
16th Driest
Driest since:
1952
113th Wettest
Wettest since:
2018
Aug–Oct 1940
3-Month
6.74"
(171.20mm)
7.27"
(184.66mm)
-0.53"
(-13.46mm)
29th Driest
Driest since:
1952
100th Wettest
Wettest since:
2018
Ties: 1908
Jul–Oct 1940
4-Month
9.24"
(234.70mm)
10.05"
(255.27mm)
-0.81"
(-20.57mm)
27th Driest
Driest since:
1952
102nd Wettest
Wettest since:
1941
Jun–Oct 1940
5-Month
12.22"
(310.39mm)
12.97"
(329.44mm)
-0.75"
(-19.05mm)
33rd Driest
Driest since:
1952
96th Wettest
Wettest since:
1941
May–Oct 1940
6-Month
14.44"
(366.78mm)
15.88"
(403.35mm)
-1.44"
(-36.57mm)
20th Driest
Driest since:
1952
109th Wettest
Wettest since:
1941
Ties: 1964
Apr–Oct 1940
7-Month
17.48"
(443.99mm)
18.40"
(467.36mm)
-0.92"
(-23.37mm)
30th Driest
Driest since:
1952
99th Wettest
Wettest since:
1941
Mar–Oct 1940
8-Month
19.75"
(501.65mm)
20.91"
(531.11mm)
-1.16"
(-29.46mm)
27th Driest
Driest since:
1956
102nd Wettest
Wettest since:
2019
Feb–Oct 1940
9-Month
22.73"
(577.34mm)
23.04"
(585.22mm)
-0.31"
(-7.88mm)
48th Driest
Driest since:
1934
81st Wettest
Wettest since:
2019
Ties: 1948
Jan–Oct 1940
10-Month
24.66"
(626.36mm)
25.36"
(644.14mm)
-0.70"
(-17.78mm)
35th Driest
Driest since:
1934
94th Wettest
Wettest since:
2019
Dec 1939–Oct 1940
11-Month
26.54"
(674.12mm)
27.70"
(703.58mm)
-1.16"
(-29.46mm)
34th Driest
Driest since:
1931
94th Wettest
Wettest since:
2019
Nov 1939–Oct 1940
12-Month
27.53"
(699.26mm)
29.93"
(760.22mm)
-2.40"
(-60.96mm)
21st Driest
Driest since:
1934
107th Wettest
Wettest since:
2019
May 1939–Oct 1940
18-Month
41.34"
(1,050.04mm)
45.83"
(1,164.08mm)
-4.49"
(-114.04mm)
8th Driest
Driest since:
1931
120th Wettest
Wettest since:
2019
Nov 1938–Oct 1940
24-Month
54.71"
(1,389.63mm)
59.90"
(1,521.46mm)
-5.19"
(-131.83mm)
8th Driest
Driest since:
1931
119th Wettest
Wettest since:
2019
Nov 1937–Oct 1940
36-Month
85.32"
(2,167.13mm)
89.86"
(2,282.44mm)
-4.54"
(-115.31mm)
18th Driest
Driest since:
1956
108th Wettest
Wettest since:
2019
Nov 1936–Oct 1940
48-Month
115.17"
(2,925.32mm)
119.78"
(3,042.41mm)
-4.61"
(-117.09mm)
17th Driest
Driest since:
1956
108th Wettest
Wettest since:
2019
Nov 1935–Oct 1940
60-Month
142.33"
(3,615.18mm)
149.66"
(3,801.36mm)
-7.33"
(-186.18mm)
9th Driest
Driest since:
1934
115th Wettest
Wettest since:
2019

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