Boston Weather in December
United States · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
December in Boston sees average temperatures ranging from a low of -1.7°C (28.9°F) to a high of 6.2°C (43.2°F), with a mean of 2.2°C (36.0°F). Compared to the annual average of 11.2°C (52.2°F), this month is 9.0°C cooler than the yearly norm. Precipitation averages 131.7mm, making it approximately 30.0mm wetter than the monthly average of 102.0mm. This is the wettest month of the year, with 131.7mm of precipitation and around 12.0 rainy days. The city receives an average of 5.6 hours of sunshine per day during December, with relative humidity averaging 72.9%. Wind speeds reach an average maximum of 20.4 km/h. Snowfall averages 11.7cm during December, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Boston, with wetter-than-average conditions compared to the rest of the year.
Boston's four distinct seasons make it one of the most dynamic New England cities for climate study. I've tracked the data and found that the city experiences beautiful autumns, cold winters, mild springs, and warm summers. The best time for visiting is May to October, with September being the ideal month for comfortable temperatures and the famous fall foliage.
December vs Adjacent Months
| Metric | November | December | January |
|---|---|---|---|
| Mean Temp | 7.1°C (44.8°F) | 2.2°C (36.0°F) | -0.4°C (31.3°F) |
| Rainfall | 74.4mm | 131.7mm | 109.0mm |
| Sunshine | 7.1 hrs | 5.6 hrs | 5.7 hrs |
| Humidity | 69.6% | 72.9% | 69.3% |
| Wind | 20.8 km/h | 20.4 km/h | 21.4 km/h |
| Rainy Days | 9.4 | 12.0 | 9.6 |
| Snowfall | 0.5 cm | 11.7 cm | 24.2 cm |
Seasonal Context
December falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Boston in December, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Boston in December?
The average temperature in Boston during December ranges from -1.7°C (28.9°F) to 6.2°C (43.2°F), with a mean of 2.2°C (36.0°F).
How much does it rain in Boston in December?
Boston receives an average of 131.7mm of precipitation in December, spread across approximately 12.0 rainy days. This is the wettest month of the year.
What should I pack for Boston in December?
Based on December weather data, pack heavy winter clothing, thermal layers, and a warm coat. Rain gear is essential — this month averages 131.7mm of precipitation.
Is December a good time to visit Boston?
December is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Boston
Cities with Similar December Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 42.36°, -71.06°. Timezone: America/New_York. Last updated: 2026-07-30.