Connecticut, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Groton, CT

Average sea temperature - Groton, CT

The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

Average daylight - Groton, CT

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.2h).