Weather history and climate summary information is available for the following locations:
- Groton CT
- Hartford
- Stratford
- Windsor Locks
Warmest January Days
The warmest January days in Connecticut are:
| Windsor Locks, Connecticut | 2007 | 72°F |
| Hartford, Connecticut | 2007 | 71.1°F |
| Hartford, Connecticut | 2008 | 69.1°F |
| Stratford, Connecticut | 2002 | 68°F |
| Stratford, Connecticut | 2007 | 68°F |
Coldest January Days
The coldest January days in Connecticut were:
| Windsor Locks, Connecticut | 1984 | -18°F |
| Windsor Locks, Connecticut | 1988 | -14.3°F |
| Windsor Locks, Connecticut | 1981 | -14.1°F |
| Groton CT, Connecticut | 1984 | -11.7°F |
| Hartford, Connecticut | 1984 | -10.8°F |
Wettest January Days
The wettest single days in January occurred:
| Windsor Locks, Connecticut | 1973 | 3.5 inches |
| Stratford, Connecticut | 1973 | 3.5 inches |
| Stratford, Connecticut | 1998 | 2.9 inches |
| Stratford, Connecticut | 1978 | 2.7 inches |
| Stratford, Connecticut | 1979 | 2.7 inches |