Contiguous U.S. September 1940 Minimum Temperature Rankings
1901-2000
Degrees Fahrenheit
1
52.56
51.90
0.66
80
50
1918
2019
1937
1939
normal
2
55.79
55.48
0.31
68
62
1974
2019
1935
1939
normal
3
57.42
57.16
0.26
64
66
1924
2022
1932
1939
normal
4
57.12
56.78
0.34
72
58
1903
2021
1935
1939
normal
5
55.12
54.91
0.21
65
65
1907,1924
2018
1935
1939
normal
1949
6
52.32
52.20
0.12
58
72
1907
2018
1935
1939
normal
1911
7
49.15
49.02
0.13
59
71
1917
2012
1932
1939
normal
1930,1983
8
46.04
45.75
0.29
77
53
1917
2012
1939
1938
normal
1961
9
42.49
42.86
-0.37
39
91
1917
2012
1937
1939
bottom-third
10
40.90
40.84
0.06
63
66
1917
2016
1937
1939
normal
11
39.87
39.92
-0.05
53
76
1917
2016
1937
1939
normal
1947
12
40.01
40.04
-0.03
54
75
1917
2016
1937
1939
normal
18
44.29
44.09
0.20
73
56
1917
2016
1937
1939
normal
1911
24
40.18
40.04
0.14
69
59
1918
2017
1937
1939
normal
1931,1973
36
40.51
40.02
0.49
87
40
1918
2017,2018
1939
1936
top-third
48
40.26
40.01
0.25
75
51
1918
2018
1939
1938
normal
60
40.11
40.00
0.11
66
59
1920
2019,2020
1933
1939
normal