Groton Weather in December

Groton in December sees low daytime temperatures of 7°C (45°F) and nighttime lows of -1°C (30°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.

Rainfall in Groton in December

An umbrella might come in handy since it is the wettest month of the year. Based on our climate data of the past 30 years, about 12 days of snow/rain are anticipated, with 128 mm (5 in) on average. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Groton in December

If you're visiting Groton in December, expect highs of 7°C (45°F) and overnight lows around -1°C (30°F). December marks the winter season. Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. With lows of -1°C (30°F), nights are freezing. Packing a spare blanket is worth considering if you're staying somewhere that might not be fully heated.

Sunshine in Groton in December

The area experiences a moderate amount of sunshine, with approximately 139 hours of sunlight expected. This means a decent mix of sun and overcast.

December in Groton has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.