Boston Weather in December

December in Boston brings low temperatures, with daytime highs of 6°C (43°F) and nights around -1°C (30°F). It's also the wettest month of the year, so an umbrella is a must.

Rainfall in Boston in December

Expect frequent showers this month, so make sure to have an umbrella to keep yourself dry. On average, there are about 12 days with snow/rain during this month, averaging 132 mm (5.2 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Boston in December

In December, Boston gets low temperatures, with highs of 6°C (43°F). Nights cool to around -1°C (30°F). December is part of winter. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. 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 Boston in December

The month brings about 141 hours of sunlight, offering a comfortable mix of sun and overcast.

Wind Speed in Boston in December

Average wind conditions reach 7 m/s (14 knots) in December. This indicates a windy month with strong breezes dominating the weather pattern. Remember this is an average: while most days are notably windy, some calmer periods occur alongside more stormy conditions.

Average water temperature in December

The water sits at 8°C (46°F) this month, which is well below what most people consider swimmable. Wetsuits help, but expect it to still feel cold.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Boston. Our weather planner can help you explore destinations with more pleasant weather conditions.