Monthly climate guide
Boston weather in December
December in Boston is typically cold, with average daytime highs around 4°C (40°F) and night-time lows near -3°C (27°F). The month usually brings about 122 mm of rain (wet) and is often cloudy. Daytime highs are 5°C cooler than November and 3°C warmer than January.
What stands out in December
- Just 80 km apart, but Boston runs about 3°C cooler than Provincetown this month.
- Expect more cloud than at any other time of year.
- Nights often drop below freezing (average low -3°C), so expect frost and icy mornings.
- Only 2 months are cooler in Boston than December.
Avg high
4°C
40°F
Avg low
-3°C
27°F
Rainfall
122 mm
wet
Humidity
87%
relative
Sky
66%
cloud · often cloudy
Boston weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 1°C / 34°F | -7°C / 19°F | 84 mm | 87% | 62% |
| February | 2°C / 35°F | -7°C / 19°F | 92 mm | 88% | 63% |
| March | 6°C / 43°F | -3°C / 26°F | 86 mm | 82% | 61% |
| April | 13°C / 55°F | 2°C / 36°F | 108 mm | 79% | 63% |
| May | 19°C / 66°F | 9°C / 47°F | 77 mm | 79% | 65% |
| June | 24°C / 74°F | 14°C / 56°F | 116 mm | 78% | 60% |
| July | 28°C / 83°F | 18°C / 64°F | 87 mm | 75% | 54% |
| August | 28°C / 82°F | 17°C / 63°F | 96 mm | 72% | 51% |
| September | 24°C / 75°F | 13°C / 56°F | 91 mm | 74% | 53% |
| October | 17°C / 63°F | 8°C / 46°F | 125 mm | 79% | 61% |
| November | 10°C / 49°F | 1°C / 34°F | 97 mm | 81% | 57% |
| December | 4°C / 40°F | -3°C / 27°F | 122 mm | 87% | 66% |
What to pack for December
- A proper insulated winter coat
- A hat, scarf and gloves
- Thermal base layers and warm, grippy boots for icy mornings
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is December a good time to visit Boston?
Compare the months in the chart above to find your ideal window.
Best time to visit Boston →Other United States cities in December
Cite or embed this data
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Boston weather in December. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/boston/december
<a href="https://weathercompare.eu/weather/usa/boston/december">Boston weather in December</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/boston" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Boston weather in December"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/boston/december">Boston weather in December</a> – WeatherCompare</p>
Boston in December: quick answers
Is December a good time to visit Boston?
December is cool in Boston, with highs around 4°C. Better for museums and city walks than the beach, and usually quieter.
How warm is Boston in December?
Average highs are about 4°C (40°F) and average lows about -3°C (27°F), based on 10 years of daily data.
Does it rain a lot in Boston in December?
Boston typically gets around 122 mm of rain in December — wet.
Figures are long-term averages for the area around Boston (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.