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, January 1940

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
January 1940
1-Month
1.93"
(49.02mm)
2.31"
(58.67mm)
-0.38"
(-9.65mm)
30th Driest
Driest since:
1981
99th Wettest
Wettest since:
1916
Dec 1939–Jan 1940
2-Month
3.81"
(96.77mm)
4.66"
(118.36mm)
-0.85"
(-21.59mm)
16th Driest
Driest since:
1981
112th Wettest
Wettest since:
1932
Nov 1939–Jan 1940
3-Month
4.80"
(121.92mm)
6.89"
(175.01mm)
-2.09"
(-53.09mm)
3rd Driest
Driest since:
1977
125th Wettest
Wettest since:
2016
Oct 1939–Jan 1940
4-Month
6.40"
(162.56mm)
9.06"
(230.12mm)
-2.66"
(-67.56mm)
2nd Driest
Driest since:
1981
126th Wettest
Wettest since:
2016
Ties: 1918
Sep 1939–Jan 1940
5-Month
8.02"
(203.71mm)
11.55"
(293.37mm)
-3.53"
(-89.66mm)
1st Driest
Driest since:
1940
127th Wettest
Wettest since:
2019
Aug 1939–Jan 1940
6-Month
10.73"
(272.54mm)
14.17"
(359.92mm)
-3.44"
(-87.38mm)
1st Driest
Driest since:
1940
127th Wettest
Wettest since:
2019
Jul 1939–Jan 1940
7-Month
13.09"
(332.49mm)
16.96"
(430.78mm)
-3.87"
(-98.29mm)
1st Driest
Driest since:
1940
127th Wettest
Wettest since:
2019
Jun 1939–Jan 1940
8-Month
16.41"
(416.81mm)
19.88"
(504.95mm)
-3.47"
(-88.14mm)
5th Driest
Driest since:
1981
123rd Wettest
Wettest since:
2019
May 1939–Jan 1940
9-Month
18.61"
(472.69mm)
22.79"
(578.87mm)
-4.18"
(-106.18mm)
2nd Driest
Driest since:
1918
126th Wettest
Wettest since:
2016
Apr 1939–Jan 1940
10-Month
20.77"
(527.56mm)
25.32"
(643.13mm)
-4.55"
(-115.57mm)
1st Driest
Driest since:
1940
127th Wettest
Wettest since:
2016
Mar 1939–Jan 1940
11-Month
22.84"
(580.14mm)
27.83"
(706.88mm)
-4.99"
(-126.74mm)
3rd Driest
Driest since:
1957
125th Wettest
Wettest since:
1974
Feb 1939–Jan 1940
12-Month
25.77"
(654.56mm)
29.96"
(760.98mm)
-4.19"
(-106.42mm)
6th Driest
Driest since:
1931
122nd Wettest
Wettest since:
1974
Aug 1938–Jan 1940
18-Month
37.79"
(959.87mm)
44.14"
(1,121.16mm)
-6.35"
(-161.29mm)
2nd Driest
Driest since:
1955
125th Wettest
Wettest since:
2020
Feb 1938–Jan 1940
24-Month
55.89"
(1,419.61mm)
59.93"
(1,522.22mm)
-4.04"
(-102.61mm)
17th Driest
Driest since:
1918
110th Wettest
Wettest since:
2020
Feb 1937–Jan 1940
36-Month
84.86"
(2,155.44mm)
89.86"
(2,282.44mm)
-5.00"
(-127.00mm)
15th Driest
Driest since:
1957
111th Wettest
Wettest since:
2020
Feb 1936–Jan 1940
48-Month
112.91"
(2,867.91mm)
119.76"
(3,041.90mm)
-6.85"
(-173.99mm)
9th Driest
Driest since:
1957
116th Wettest
Wettest since:
2020
Feb 1935–Jan 1940
60-Month
142.87"
(3,628.90mm)
149.63"
(3,800.60mm)
-6.76"
(-171.70mm)
11th Driest
Driest since:
1957
113th Wettest
Wettest since:
2020

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