Groton Weather in January

January in Groton brings low temperatures, with highs of 4°C (39°F) and nights dropping to -5°C (23°F). Rainfall is on the higher side this month, averaging around 97 mm (3.8 in), so keep a rain jacket handy.

Rainfall in Groton in January

You can expect snow/rain on around 11 days based on historical patterns, with 97 mm (3.8 in) average for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Groton in January

Temperatures in Groton in January top out at 4°C (39°F) and drop to -5°C (23°F) overnight. Winter occurs in January. Expect a distinctly cold feel throughout the day, not just overnight. Nights are well below freezing at -5°C (23°F). An extra blanket is a good idea if you feel the cold, especially in older or less well-heated accommodation. This month is known for being the coldest, so make sure you pack appropriately with plenty of warm clothing.

Sunshine in Groton in January

The month brings about 169 hours of sunlight, offering a comfortable mix of sun and overcast.

January in Groton has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.