Weather history and climate summary information is available for the following locations:
- Baltimore
- Camp Springs
- Patuxent River
Warmest December Days
The warmest December days in Maryland are:
| Patuxent River, Maryland | 1998 | 80.1°F |
| Camp Springs, Maryland | 1998 | 78.8°F |
| Patuxent River, Maryland | 1984 | 77°F |
| Baltimore, Maryland | 1984 | 77°F |
| Baltimore, Maryland | 1998 | 77°F |
Coldest December Days
The coldest December days in Maryland were:
| Baltimore, Maryland | 1960 | 0°F |
| Camp Springs, Maryland | 1993 | 1°F |
| Baltimore, Maryland | 1983 | 1°F |
| Patuxent River, Maryland | 1989 | 1.2°F |
| Baltimore, Maryland | 1963 | 1.9°F |
Wettest December Days
The wettest single days in December occurred:
| Camp Springs, Maryland | 2010 | 4 inches |
| Patuxent River, Maryland | 1983 | 3.6 inches |
| Camp Springs, Maryland | 2011 | 2.7 inches |
| Baltimore, Maryland | 1977 | 2.6 inches |
| Camp Springs, Maryland | 1983 | 2.6 inches |