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Boston in December: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Boston in December is climatically mixed. The average daily high is around 4 °C, and the sea is about 8 °C. With about 11 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
25/100 · #12
Warmth
#10
Dryness
#8
Sun
#12
Sea warmth
#8
Published best categories: none
Boston · DecemberPhoto: Chris Wood ( User:chris_j_wood ) · CC BY-SA 4.0Climate facts
- Average high
- 4 °C
- Average low
- -4 °C
- Sea
- 8 °C
- Rainy days (est.)
- 11 rainy days (est.)
- Sun (est.)
- 2 h/day
- Humidity
- 86 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| November | 10 | 1 | 10 | 96 | 2.5 | 81 | 0.7 | 10 | 33 |
| December (selected) | 4 | -4 | 11 | 115 | 1.9 | 86 | 0.8 | 8 | 25 |
| January | 1 | -8 | 10 | 94 | 2.2 | 88 | 1.0 | 5 | 27 |
How do the previous and next months compare?
Baseline: December (25/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| November | +8 | +5.9 °C | +4.8 °C | -1.6 | -18.4 mm | +0.6 h | -4.5 % | -0.1 m/s | +2.8 °C |
| January | +2 | -3.2 °C | -3.9 °C | -1.1 | -20.7 mm | +0.3 h | +2.2 % | +0.2 m/s | -2.5 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Boston in December?
The average daily high is around 4 °C, with an average daily low of about -4 °C.
Can you swim in Boston in December?
The sea is about 8 °C (cold).
Does it rain a lot in Boston in December?
The curated estimate is about 11 rainy days per month, not a directly measured long-term average. Total precipitation averages around 115 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Boston?
By the climate score, June, July, August and September are the strongest months for Boston. For a beach trip: July, August and September. December is not among them.