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 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
September 1939
1-Month
1.62"
(41.15mm)
2.49"
(63.25mm)
-0.87"
(-22.10mm)
8th Driest
Driest since:
1956
121st Wettest
Wettest since:
1986
Aug–Sep 1939
2-Month
4.33"
(109.98mm)
5.11"
(129.79mm)
-0.78"
(-19.81mm)
12th Driest
Driest since:
1956
117th Wettest
Wettest since:
1977
Jul–Sep 1939
3-Month
6.69"
(169.93mm)
7.88"
(200.15mm)
-1.19"
(-30.22mm)
10th Driest
Driest since:
1930
119th Wettest
Wettest since:
1915
Jun–Sep 1939
4-Month
10.01"
(254.25mm)
10.81"
(274.57mm)
-0.80"
(-20.32mm)
25th Driest
Driest since:
1930
104th Wettest
Wettest since:
1915
May–Sep 1939
5-Month
12.21"
(310.13mm)
13.72"
(348.49mm)
-1.51"
(-38.36mm)
14th Driest
Driest since:
1956
115th Wettest
Wettest since:
1915
Apr–Sep 1939
6-Month
14.37"
(365.00mm)
16.24"
(412.50mm)
-1.87"
(-47.50mm)
13th Driest
Driest since:
1956
116th Wettest
Wettest since:
1915
Mar–Sep 1939
7-Month
16.44"
(417.58mm)
18.75"
(476.25mm)
-2.31"
(-58.67mm)
10th Driest
Driest since:
1956
119th Wettest
Wettest since:
1973
Feb–Sep 1939
8-Month
19.37"
(492.00mm)
20.88"
(530.35mm)
-1.51"
(-38.35mm)
21st Driest
Driest since:
1930
108th Wettest
Wettest since:
2019
Jan–Sep 1939
9-Month
21.86"
(555.24mm)
23.20"
(589.28mm)
-1.34"
(-34.04mm)
25th Driest
Driest since:
1934
104th Wettest
Wettest since:
2019
Dec 1938–Sep 1939
10-Month
23.57"
(598.68mm)
25.54"
(648.72mm)
-1.97"
(-50.04mm)
19th Driest
Driest since:
1931
109th Wettest
Wettest since:
2019
Nov 1938–Sep 1939
11-Month
25.58"
(649.73mm)
27.77"
(705.36mm)
-2.19"
(-55.63mm)
19th Driest
Driest since:
1934
109th Wettest
Wettest since:
2019
Oct 1938–Sep 1939
12-Month
26.88"
(682.75mm)
29.94"
(760.48mm)
-3.06"
(-77.73mm)
14th Driest
Driest since:
1934
114th Wettest
Wettest since:
2019
Apr 1938–Sep 1939
18-Month
43.78"
(1,112.01mm)
46.20"
(1,173.48mm)
-2.42"
(-61.47mm)
24th Driest
Driest since:
1931
104th Wettest
Wettest since:
2019
Oct 1937–Sep 1939
24-Month
58.80"
(1,493.52mm)
59.92"
(1,521.97mm)
-1.12"
(-28.45mm)
42nd Driest
Driest since:
1918
85th Wettest
Wettest since:
2020
Ties: 1944
Oct 1936–Sep 1939
36-Month
88.12"
(2,238.25mm)
89.87"
(2,282.70mm)
-1.75"
(-44.45mm)
39th Driest
Driest since:
1956
87th Wettest
Wettest since:
2019
Oct 1935–Sep 1939
48-Month
114.82"
(2,916.43mm)
119.78"
(3,042.41mm)
-4.96"
(-125.98mm)
18th Driest
Driest since:
1956
107th Wettest
Wettest since:
2019
Oct 1934–Sep 1939
60-Month
145.48"
(3,695.19mm)
149.66"
(3,801.36mm)
-4.18"
(-106.17mm)
25th Driest
Driest since:
1956
99th Wettest
Wettest since:
2020

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