Weather history and climate summary information is available for the following locations:
- Groton CT
- Hartford
- Stratford
- Windsor Locks
Warmest May Days
The warmest May days in Connecticut are:
| Hartford, Connecticut | 2010 | 99°F |
| Windsor Locks, Connecticut | 2010 | 99°F |
| Hartford, Connecticut | 1996 | 97.9°F |
| Stratford, Connecticut | 1996 | 97°F |
| Windsor Locks, Connecticut | 1996 | 97°F |
Coldest May Days
The coldest May days in Connecticut were:
| Windsor Locks, Connecticut | 1985 | 28°F |
| Windsor Locks, Connecticut | 2001 | 28°F |
| Windsor Locks, Connecticut | 2008 | 28.9°F |
| Windsor Locks, Connecticut | 1975 | 28.9°F |
| Windsor Locks, Connecticut | 2010 | 28.9°F |
Wettest May Days
The wettest single days in May occurred:
| Windsor Locks, Connecticut | 1973 | 5.5 inches |
| Windsor Locks, Connecticut | 1989 | 4.4 inches |
| Groton CT, Connecticut | 2006 | 3.3 inches |
| Windsor Locks, Connecticut | 1984 | 2.9 inches |
| Windsor Locks, Connecticut | 2006 | 2.8 inches |