United States · 1991–2020 normal
Boston Seaport in
December.
Typical December weather in Boston Seaport: 5.8°C by day, -1.4°C at night, 109 mm of rain over 9.4 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high5.8°C
Typical low-1.4°C
Rain109 mm
Wet days9.4
Comfort score 5 this month (September leads the year at 85). Daylight is calculated as 9 h 06 from latitude 42.35°. Open-water sea temperature is 7.5°C (14 km from the place centre).
Event window
Frost-level nights in December
The measured night-time normal is -1.4°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 10172910
- NOAA station
- USW00014739 · BOSTON
- Station distance
- 3.2 km from the place centre
- Coverage
- Strong coverage · 30 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.