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 1990

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
September 1990
1-Month		54.34°F
(12.41°C)		51.90°F
(11.06°C)		2.44°F
(1.35°C)		118th Coolest
Coolest since:
1918
11th Warmest
Warmest since:
2019
Aug–Sep 1990
2-Month		56.99°F
(13.88°C)		55.48°F
(13.04°C)		1.51°F
(0.84°C)		112th Coolest
Coolest since:
1974
17th Warmest
Warmest since:
2019
Jul–Sep 1990
3-Month		58.24°F
(14.58°C)		57.16°F
(13.98°C)		1.08°F
(0.60°C)		103rd Coolest
Coolest since:
1924
26th Warmest
Warmest since:
2022
Jun–Sep 1990
4-Month		57.99°F
(14.44°C)		56.78°F
(13.77°C)		1.21°F
(0.67°C)		104th Coolest
Coolest since:
1903
25th Warmest
Warmest since:
2021
May–Sep 1990
5-Month		55.76°F
(13.20°C)		54.91°F
(12.73°C)		0.85°F
(0.47°C)		97th Coolest
Coolest since:
1907, 1924
32nd Warmest
Warmest since:
2018
Apr–Sep 1990
6-Month		53.13°F
(11.74°C)		52.20°F
(11.22°C)		0.93°F
(0.52°C)		101st Coolest
Coolest since:
1907
28th Warmest
Warmest since:
2018
Ties: 1900, 1987
Mar–Sep 1990
7-Month		50.31°F
(10.17°C)		49.02°F
(9.46°C)		1.29°F
(0.71°C)		108th Coolest
Coolest since:
1917
21st Warmest
Warmest since:
2012
Feb–Sep 1990
8-Month		47.17°F
(8.43°C)		45.75°F
(7.64°C)		1.42°F
(0.79°C)		111th Coolest
Coolest since:
1917
18th Warmest
Warmest since:
2012
Jan–Sep 1990
9-Month		44.80°F
(7.11°C)		42.86°F
(6.03°C)		1.94°F
(1.08°C)		118th Coolest
Coolest since:
1917
11th Warmest
Warmest to Date
2012
Dec 1989–Sep 1990
10-Month		41.98°F
(5.54°C)		40.84°F
(4.91°C)		1.14°F
(0.63°C)		98th Coolest
Coolest since:
1917
30th Warmest
Warmest since:
2016
Nov 1989–Sep 1990
11-Month		40.98°F
(4.99°C)		39.92°F
(4.40°C)		1.06°F
(0.59°C)		98th Coolest
Coolest since:
1917
30th Warmest
Warmest since:
2016
Oct 1989–Sep 1990
12-Month		41.00°F
(5.00°C)		40.04°F
(4.47°C)		0.96°F
(0.53°C)		98th Coolest
Coolest since:
1917
30th Warmest
Warmest since:
2016
Apr 1989–Sep 1990
18-Month		44.82°F
(7.12°C)		44.09°F
(6.72°C)		0.73°F
(0.40°C)		94th Coolest
Coolest since:
1917
34th Warmest
Warmest since:
2016
Oct 1988–Sep 1990
24-Month		40.64°F
(4.80°C)		40.04°F
(4.47°C)		0.60°F
(0.33°C)		91st Coolest
Coolest since:
1918
36th Warmest
Warmest since:
2017
Oct 1987–Sep 1990
36-Month		40.49°F
(4.72°C)		40.02°F
(4.46°C)		0.47°F
(0.26°C)		86th Coolest
Coolest since:
1918
40th Warmest
Warmest since:
2017, 2018
Oct 1986–Sep 1990
48-Month		40.73°F
(4.85°C)		40.01°F
(4.45°C)		0.72°F
(0.40°C)		96th Coolest
Coolest since:
1918
29th Warmest
Warmest since:
2018
Ties: 1995
Oct 1985–Sep 1990
60-Month		40.80°F
(4.89°C)		40.00°F
(4.44°C)		0.80°F
(0.45°C)		96th Coolest
Coolest since:
1920
28th Warmest
Warmest to Date
2019, 2020

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