Boston weather in December
December in Boston: cold, rainy, with clean air — a fair time to visit.
#10 of 12 months in Boston · #478 of 604 destinations to visit in December · comfort 51/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Boston climate normals — December
| Daytime high | 6°C / 43°F | 🧥 cold |
|---|---|---|
| Nighttime low | -1°C / 30°F | |
| Feels like (high) | 2°C / 36°F | |
| Rainfall | 148 mm / 5.8 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 74% | 💧 humid |
| Dew point | -2°C / 29°F | |
| Sunshine | 5.2 h/day | |
| Daylight | 9.1 h | |
| Wind | 23 km/h / 14 mph | |
| Snowfall | 16.3 cm / 6.4 in | |
| Air quality (US AQI) | 40 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Boston in December — FAQ
- Is December a good time to visit Boston?
- December in Boston: cold, rainy, with clean air — a fair time to visit. It ranks #10 of 12 months for Boston on SeasonMap's comfort score (51/100).
- What is the weather like in Boston in December?
- In December, Boston averages a daily high of 6°C and a low of -1.1°C, with about 148.1 mm of rain over roughly 11 rainy days.
- What is the air quality in Boston in December?
- Boston has a mean US Air Quality Index of about 40 in December.
- Does it snow in Boston in December?
- Boston sees roughly 16.3 cm of snowfall in December.