Weather in Boston in December
How warm is it in Boston in December?
In December the typical daytime high in Boston is 4.3 °C on average, from 6.7 °C at the start to 2.9 °C at the end of the month.
That is 5.9 °C cooler than in November and 2.4 °C warmer than in January.
The last 10 years were 1.8 °C warmer than more than 40 years ago.
Click a day for more: afternoon and night, the usual range, records and how fast it is warming.
The average of the weather stations Blue Hill Coop (17 km) and Nashua (59 km); nearer ones count more.