Howling winds, rain, warmer temperatures than you might expect, sudden snow squalls, and beautiful bright sunny days form an unpredictable mix.
But you'll be rewarded for visiting Boston in December, despite the weather.
You can expect attractive Boston hotel deals, plenty of museums and sports events, and exciting shows at the Boston Opera House and other Theater District venues make December weather in Boston enjoyable. Even better: sparkling holiday lights and Christmas decorations, fantastic winter holiday markets, and lots of cheer wherever you go.
If you're planning to travel to Boston in December, keep in mind that the city tends to be warmer than the average temperatures for December weather in Massachusetts most of the time - except when coastal storms called nor'easters slam down freezing rain, snow, or sleet on us.
Although each year is different, we can almost always be sure of getting some snow, even if it is only a few flakes or flurries, at least a few days of 50 degree or higher temperatures, possibly some rain (or freezing rain or sleet), and usually many days with brilliant sunshine.
Just be aware that some years bring a lot of snow - so check our December packing tips below to make sure you'll be prepared!
Top photo: Boston's Public Garden in December - weather was chilly, but not cold, and as you'll notice, there's no snow on the ground and the holiday lights turn it into a winter wonderland
December Weather in Boston
December weather in Boston is tricky to predict because fairly wide temperature variations mean we may get snow . . . or just rain.
Most days will be somewhere between chilly and cold. If the sun is shining and no wind is blowing, you will feel comfortable regardless of the thermostat (assuming you're wearing a couple of layers and moving around). But on gray days, especially if there is strong wind, December can feel frigid.
During most years, December is the balmiest month of Boston's winter. However, some years prove the exception.
These photos will give you a sense of what December Boston weather can look like. Note that none of them show snow on the ground - although snow certainly can happen this month.
Although a few splashes of fall foliage may remain at the beginning of the month, by mid-month it has mostly disappeared - except for the weeping willows around the Lagoon in the Public Garden.
Lots of evergreens throughout the city keep the landscape from looking bleak.
Days are the shortest of the year in December - but because the weather is still relatively warm and dry compared with January and February (and for that matter, March and April), sitting outside in late afternoon can still feel relatively comfortable.
December Temperatures and Conditions
December weather in Boston differs every year. In general, though, you should expect cold weather; if you happen to experience a balmy day, just feel lucky!
If you're planning a Boston visit during December, you should take a look at average temperatures for the month - as well as the record highs and record lows:
Record high temperature for December: 76° F (1998) Record low temperature for December: -17° F (1933) Average December high temperature: 41° F Average December low temperature: 28° F Average number of days with precipitation in December: 11 Average snowfall in Boston for December: 9
Although large snow storms don't usually hit Boston in December, they can happen at any point in the month, including at the very beginning.
By the end of the month when the New Year's Eve / First Night celebration takes place on New Year's Eve, temperatures are typically in the frigid zone, especially after night fall.
If you are planning to travel during December, weather can be a big consideration when deciding what to pack, so be sure to check the Boston weather report before coming.
Cold Boston weather in December makes indoor activities very attractive - theaters, sports, and museums rank high on lists of popular things to do.
On New Year's Eve, First Night is Boston's biggest celebration. Festivities usually start around noon and end after midnight. Many take place outdoors - so dress warmly, and remember your gloves and a hat.
If you're more of an indoor person, another fun option where you can stay toasty warm while seeing some fantastic outdoor views of the city: combine sightseeing with music, food, and perhaps winter cocktails on these themed Boston Harbor cruises on the fully enclosed and heated yacht Northern Lights:
Celebrate the holidays while relaxing and sightseeing on the festively decorated Yacht Northern Lights on these special cruises around Boston Harbor:
Northern Lights Sunset Cruise - Unwind on this popular after-work cruise as the sky changes brilliant colors and light music plays in the background. Stop by the bar for a drink, watch the sights go by, and hear the USS Constitution's traditional sunset salute - Through Dec 4
Holiday Brunch Cruise - See historic sights and panoramic views around Boston Harbor with friends and family as you enjoy this relaxing cruise with brunch, hot chocolate, and holiday cheer - Book now
An Irish Christmas Carol Cruise - Get into the holiday spirit on the Northern Lights as you raise your glass and toast the holidays with festive holiday music playing in the background on this popular Harbor cruise - Book now