Boston Weather in January
United States · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
January in Boston sees average temperatures ranging from a low of -4.2°C (24.4°F) to a high of 3.6°C (38.5°F), with a mean of -0.4°C (31.3°F). Compared to the annual average of 11.2°C (52.2°F), this month is 11.6°C cooler than the yearly norm. This is the coldest month of the year, with average lows of -4.2°C (24.4°F). Precipitation averages 109.0mm, making it approximately 7.0mm wetter than the monthly average of 102.0mm. The city receives an average of 5.7 hours of sunshine per day during January, with relative humidity averaging 69.3%. Wind speeds reach an average maximum of 21.4 km/h. Snowfall averages 24.2cm during January, which can affect travel plans and outdoor activities. For travelers, this month offers a coldest month of the year 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.
January vs Adjacent Months
| Metric | December | January | February |
|---|---|---|---|
| Mean Temp | 2.2°C (36.0°F) | -0.4°C (31.3°F) | -0.0°C (32.0°F) |
| Rainfall | 131.7mm | 109.0mm | 74.9mm |
| Sunshine | 5.6 hrs | 5.7 hrs | 6.6 hrs |
| Humidity | 72.9% | 69.3% | 69.1% |
| Wind | 20.4 km/h | 21.4 km/h | 21.9 km/h |
| Rainy Days | 12.0 | 9.6 | 8.8 |
| Snowfall | 11.7 cm | 24.2 cm | 20.0 cm |
Seasonal Context
January falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Boston in January, 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 January?
The average temperature in Boston during January ranges from -4.2°C (24.4°F) to 3.6°C (38.5°F), with a mean of -0.4°C (31.3°F).
How much does it rain in Boston in January?
Boston receives an average of 109.0mm of precipitation in January, spread across approximately 9.6 rainy days.
What should I pack for Boston in January?
Based on January weather data, pack heavy winter clothing, thermal layers, and a warm coat. Rain gear is essential — this month averages 109.0mm of precipitation.
Is January a good time to visit Boston?
January 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 January 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.