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Climate · Boston

Boston in December

Chilly and damp, as the days hold steady.

Typical weather, averaged over 30 years

December in Boston is chilly: highs near 45°F, lows near 29°F. Rain or snow falls on about two days a week, and daylight holds at about 9 hours 8 minutes.December in Boston is chilly: highs near 7°C, lows near -2°C. Rain or snow falls on about two days a week, and daylight holds at about 9 hours 8 minutes.

High
45°F7°Caverage
Low
29°F-2°Caverage
Wet days
2a week · 35% of days
Daylight
9h 08mon average

Is December a good time to visit Boston?

December sits outside Boston's best months, which run in two parts: June, or September. Expect chilly days and rain or snow on about two days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How December sits in the year

week by week

Temperature

Highs near 45°F in December, against 40°F to 85°F through the year.Highs near 7°C in December, against 4°C to 29°C through the year.

Chance of a wet day

35% of days in December, against 27% to 38% through the year.

Cloud cover

56% cover in December, against 41% to 58% through the year.

Daylight

9h 08m in December, against 9h 08m to 15h 14m through the year.

Week by week, lightly smoothed, with December shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. November55°13°low 39°low 4°2 wet days a weekRain on about two days a week.
  2. December45°7°low 29°low -2°2 wet days a weekRain on about two days a week.
  3. January40°4°low 22°low -6°2 wet days a weekRain on about two days a week.

Where Boston sits, in December

America/New York
this place
typical high in December 40°F4°C95°F35°C
Sunrise, mid-December
7:06 AMsets 4:12 PM
Above the sea
0 mlow-lying
Latitude
42.4°Nnorthern hemisphere
Nearest of ours
Amherst120 km west

The land around Boston, shaded by its typical high in December, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in December

high · low · wet days
See December on the planning mapThe whole year in Boston

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Boston. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.