WinterOff season ~39°F highs

Things to do in Groton in December

December is off season (quieter, and often cheaper) to visit Groton, with average highs around 39°F. Museums and indoor sights come into their own, with fewer crowds outside.

Plan a December weekend Where else in December

Best picks for December

What's famous here, weighted toward what shines in December.

1Indoor escape

USS Nautilus

world's first nuclear-powered submarine

2Indoor escape

Florence Griswold Museum

museum in Olde Lyme, Connecticut

3Indoor escape

Holidays in December 2026

Christmas Day · Fri, Dec 25

Expect busier roads and pricier stays around these dates. See long weekends.

What’s on in Groton in December

Concerts, games and shows in the next few weeks. Tickets open on Ticketmaster.

Wed, Dec 2 · 2:00 PMAnnie (Touring)Goodspeed Opera House Plan a weekend around it

Wed, Dec 2 · 7:30 PM

Groton in December: quick answers

Is December a good time to visit Groton?

December is off season (quieter, and often cheaper) to visit Groton, with average highs around 39°F. Museums and indoor sights come into their own, with fewer crowds outside.

What is the weather like in Groton in December?

Average daytime highs are around 39°F, compared with 80°F in the warmest month. Check the forecast a week out; our planner favors indoor stops on rainy days.

What are the best things to do in Groton in December?

Top picks for December: USS Nautilus, Florence Griswold Museum, Gillette Castle, Submarine Force Library and Museum, Capt. Nathaniel B. Palmer House.