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 1978

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PeriodValue1901-2000
Mean
AnomalyRank
(1895-2022)
Warmest/Coolest
Since
Record
September 1978
1-Month
53.40°F
(11.89°C)
51.90°F
(11.06°C)
1.50°F
(0.83°C)
103rd Coolest
Coolest since:
1918
26th Warmest
Warmest since:
2019
Ties: 1963
Aug–Sep 1978
2-Month
56.09°F
(13.38°C)
55.48°F
(13.04°C)
0.61°F
(0.34°C)
81st Coolest
Coolest since:
1974
48th Warmest
Warmest since:
2019
Jul–Sep 1978
3-Month
57.62°F
(14.23°C)
57.16°F
(13.98°C)
0.46°F
(0.25°C)
78th Coolest
Coolest since:
1924
51st Warmest
Warmest since:
2022
Jun–Sep 1978
4-Month
57.16°F
(13.98°C)
56.78°F
(13.77°C)
0.38°F
(0.21°C)
74th Coolest
Coolest since:
1903
55th Warmest
Warmest since:
2021
May–Sep 1978
5-Month
55.25°F
(12.92°C)
54.91°F
(12.73°C)
0.34°F
(0.19°C)
72nd Coolest
Coolest since:
1907, 1924
57th Warmest
Warmest since:
2018
Ties: 2008
Apr–Sep 1978
6-Month
52.67°F
(11.48°C)
52.20°F
(11.22°C)
0.47°F
(0.26°C)
79th Coolest
Coolest since:
1907
50th Warmest
Warmest since:
2018
Mar–Sep 1978
7-Month
49.41°F
(9.67°C)
49.02°F
(9.46°C)
0.39°F
(0.21°C)
79th Coolest
Coolest since:
1917
50th Warmest
Warmest since:
2012
Ties: 1988
Feb–Sep 1978
8-Month
45.50°F
(7.50°C)
45.75°F
(7.64°C)
-0.25°F
(-0.14°C)
40th Coolest
Coolest since:
1917
89th Warmest
Warmest since:
2012
Jan–Sep 1978
9-Month
42.32°F
(5.73°C)
42.86°F
(6.03°C)
-0.54°F
(-0.30°C)
30th Coolest
Coolest since:
1917
99th Warmest
Warmest since:
2012
Dec 1977–Sep 1978
10-Month
40.42°F
(4.68°C)
40.84°F
(4.91°C)
-0.42°F
(-0.23°C)
32nd Coolest
Coolest since:
1917
96th Warmest
Warmest since:
2016
Nov 1977–Sep 1978
11-Month
39.69°F
(4.27°C)
39.92°F
(4.40°C)
-0.23°F
(-0.13°C)
40th Coolest
Coolest since:
1917
88th Warmest
Warmest since:
2016
Oct 1977–Sep 1978
12-Month
39.82°F
(4.34°C)
40.04°F
(4.47°C)
-0.22°F
(-0.13°C)
46th Coolest
Coolest since:
1917
82nd Warmest
Warmest since:
2016
Apr 1977–Sep 1978
18-Month
44.43°F
(6.91°C)
44.09°F
(6.72°C)
0.34°F
(0.19°C)
80th Coolest
Coolest since:
1917
48th Warmest
Warmest since:
2016
Ties: 1958
Oct 1976–Sep 1978
24-Month
39.56°F
(4.20°C)
40.04°F
(4.47°C)
-0.48°F
(-0.27°C)
21st Coolest
Coolest since:
1918
106th Warmest
Warmest since:
2017
Oct 1975–Sep 1978
36-Month
39.73°F
(4.29°C)
40.02°F
(4.46°C)
-0.29°F
(-0.17°C)
35th Coolest
Coolest since:
1918
91st Warmest
Warmest since:
2017, 2018
Oct 1974–Sep 1978
48-Month
39.74°F
(4.30°C)
40.01°F
(4.45°C)
-0.27°F
(-0.15°C)
32nd Coolest
Coolest since:
1918
93rd Warmest
Warmest since:
2018
Ties: 1929, 1963
Oct 1973–Sep 1978
60-Month
39.88°F
(4.38°C)
40.00°F
(4.44°C)
-0.12°F
(-0.06°C)
47th Coolest
Coolest since:
1920
77th Warmest
Warmest since:
2019, 2020

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