Contiguous U.S. 18-Month Period Ending in December Average Temperature
Degrees Fahrenheit
1901-1909
-99
189612
53.00
-0.02
189712
52.96
-0.06
189812
53.06
0.04
189912
52.34
-0.68
190012
54.08
1.06
190112
53.67
0.65
190212
53.35
0.33
190312
52.37
-0.65
190412
52.46
-0.56
190512
52.67
-0.35
190612
53.10
0.08
190712
53.12
0.10
190812
53.43
0.41
190912
53.01
-0.01