Weather history and climate summary information is available for the following locations:
- Groton CT
- Hartford
- Stratford
- Windsor Locks
Warmest March Days
The warmest March days in Connecticut are:
| Windsor Locks, Connecticut | 1998 | 89.6°F |
| Windsor Locks, Connecticut | 1945 | 87.3°F |
| Windsor Locks, Connecticut | 1977 | 87.1°F |
| Windsor Locks, Connecticut | 2012 | 82.9°F |
| Hartford, Connecticut | 1998 | 82.9°F |
Coldest March Days
The coldest March days in Connecticut were:
| Windsor Locks, Connecticut | 2003 | -6°F |
| Windsor Locks, Connecticut | 1980 | 1°F |
| Windsor Locks, Connecticut | 1984 | 1.9°F |
| Windsor Locks, Connecticut | 2007 | 3°F |
| Windsor Locks, Connecticut | 1986 | 3.9°F |
Wettest March Days
The wettest single days in March occurred:
| Windsor Locks, Connecticut | 1973 | 5.1 inches |
| Stratford, Connecticut | 1973 | 4.3 inches |
| Groton CT, Connecticut | 2010 | 4.2 inches |
| Stratford, Connecticut | 1977 | 4.1 inches |
| Windsor Locks, Connecticut | 2011 | 3.7 inches |