Weather history and climate summary information is available for the following locations:
- Boston
- Chicopee Falls
- Nantucket
Warmest December Days
The warmest December days in Massachusetts are:
| Boston, Massachusetts | 1998 | 75°F |
| Chicopee Falls, Massachusetts | 1998 | 73.4°F |
| Boston, Massachusetts | 1984 | 73°F |
| Boston, Massachusetts | 2001 | 72°F |
| Boston, Massachusetts | 1982 | 70°F |
Coldest December Days
The coldest December days in Massachusetts were:
| Chicopee Falls, Massachusetts | 1963 | -15.5°F |
| Chicopee Falls, Massachusetts | 1989 | -13.9°F |
| Chicopee Falls, Massachusetts | 1942 | -11.6°F |
| Chicopee Falls, Massachusetts | 1951 | -11.6°F |
| Chicopee Falls, Massachusetts | 2005 | -9.4°F |
Wettest December Days
The wettest single days in December occurred:
| Chicopee Falls, Massachusetts | 2008 | 3.1 inches |
| Boston, Massachusetts | 2008 | 2.8 inches |
| Chicopee Falls, Massachusetts | 2011 | 2.7 inches |
| Boston, Massachusetts | 1993 | 2.5 inches |
| Nantucket, Massachusetts | 1999 | 2.4 inches |