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.

Minimum Temperature Rankings, September 1939

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
September 1939
1-Month 		53.51°F
(11.95°C)		 51.90°F
(11.06°C)		 1.61°F
(0.89°C)		 106th Coolest
Coolest since:
 1918
23rd Warmest
Warmest since:
 2019
Aug–Sep 1939
2-Month 		56.19°F
(13.44°C)		 55.48°F
(13.04°C)		 0.71°F
(0.40°C)		 84th Coolest
Coolest since:
 1974
45th Warmest
Warmest since:
 2019
Jul–Sep 1939
3-Month 		57.84°F
(14.36°C)		 57.16°F
(13.98°C)		 0.68°F
(0.38°C)		 91st Coolest
Coolest since:
 1924
38th Warmest
Warmest since:
 2022
Jun–Sep 1939
4-Month 		57.42°F
(14.12°C)		 56.78°F
(13.77°C)		 0.64°F
(0.35°C)		 86th Coolest
Coolest since:
 1903
43rd Warmest
Warmest since:
 2021
May–Sep 1939
5-Month 		55.73°F
(13.18°C)		 54.91°F
(12.73°C)		 0.82°F
(0.45°C)		 95th Coolest
Coolest since:
 1907, 1924
34th Warmest
Warmest since:
 2018
Apr–Sep 1939
6-Month 		52.85°F
(11.58°C)		 52.20°F
(11.22°C)		 0.65°F
(0.36°C)		 90th Coolest
Coolest since:
 1907
39th Warmest
Warmest since:
 2018
Mar–Sep 1939
7-Month 		49.62°F
(9.79°C)		 49.02°F
(9.46°C)		 0.60°F
(0.33°C)		 88th Coolest
Coolest since:
 1917
41st Warmest
Warmest since:
 2012
Ties: 1910
Feb–Sep 1939
8-Month 		45.72°F
(7.62°C)		 45.75°F
(7.64°C)		 -0.03°F
(-0.02°C)		 55th Coolest
Coolest since:
 1917
74th Warmest
Warmest since:
 2012
Jan–Sep 1939
9-Month 		43.28°F
(6.27°C)		 42.86°F
(6.03°C)		 0.42°F
(0.24°C)		 81st Coolest
Coolest since:
 1917
48th Warmest
Warmest since:
 2012
Ties: 1957
Dec 1938–Sep 1939
10-Month 		41.34°F
(5.19°C)		 40.84°F
(4.91°C)		 0.50°F
(0.28°C)		 82nd Coolest
Coolest since:
 1917
46th Warmest
Warmest since:
 2016
Nov 1938–Sep 1939
11-Month 		40.13°F
(4.52°C)		 39.92°F
(4.40°C)		 0.21°F
(0.12°C)		 72nd Coolest
Coolest since:
 1917
56th Warmest
Warmest since:
 2016
Oct 1938–Sep 1939
12-Month 		40.35°F
(4.64°C)		 40.04°F
(4.47°C)		 0.31°F
(0.17°C)		 77th Coolest
Coolest since:
 1917
51st Warmest
Warmest since:
 2016
Apr 1938–Sep 1939
18-Month 		44.52°F
(6.96°C)		 44.09°F
(6.72°C)		 0.43°F
(0.24°C)		 84th Coolest
Coolest since:
 1917
44th Warmest
Warmest since:
 2016
Ties: 2014
Oct 1937–Sep 1939
24-Month 		40.75°F
(4.86°C)		 40.04°F
(4.47°C)		 0.71°F
(0.39°C)		 95th Coolest
Coolest since:
 1918
32nd Warmest
Warmest since:
 2017
Oct 1936–Sep 1939
36-Month 		40.34°F
(4.63°C)		 40.02°F
(4.46°C)		 0.32°F
(0.17°C)		 72nd Coolest
Coolest since:
 1918
54th Warmest
Warmest since:
 2017, 2018
Oct 1935–Sep 1939
48-Month 		40.14°F
(4.52°C)		 40.01°F
(4.45°C)		 0.13°F
(0.07°C)		 69th Coolest
Coolest since:
 1918
56th Warmest
Warmest since:
 2018
Oct 1934–Sep 1939
60-Month 		40.28°F
(4.60°C)		 40.00°F
(4.44°C)		 0.28°F
(0.16°C)		 77th Coolest
Coolest since:
 1920
47th Warmest
Warmest since:
 2019, 2020

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