30YearWeather
Boston in December
Boston weather in December - United States
❄️Cool & Crisp

Boston Weather in December

Plan your December trip to Boston, United States. Based on 30 years of NASA data, expect temperatures of 5°C (high) to -3°C (low), with 26% rain probability and 8 hours of daily sunshine. The Atlantic Ocean averages 6°C in December. Pack rain gear for around 15 rainy days.

Avg High
5°C

Hottest around day 1

Avg Low
-3°C

Coolest around day 21

Rainy Days
15days

26% avg rain chance

Sunshine
8hrs/day

Winter season

Sea Temperature in December

Atlantic Ocean

6.1°C

Monthly Average

Water Feel
🥶Polar Plunge

Consider a wetsuit for extended swimming

Swim Rating
❄️Cold water hazard

Based on average sea surface temperature

Body of Water
Atlantic Ocean

Boston coastline

Boston December Weather Calendar

Click any day to see detailed weather information

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Connect

Greater Boston uses10-digit dialing. Th...

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Boston

Smart Flight Estimator

Airport-to-Airport Logistics

unlock smart flight estimates

Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub
84/ 100
Traffic Index

Extremely busy airport

Peak Daily Arrivals

0

slots per day

Peak

Aug

Low

Nov

Monthly Traffic Distribution

465
Jan
490
Feb
551
Mar
596
Apr
643
May
627
Jun
650
Jul
676
Aug
651
Sep
635
Oct
424
Nov
533
Dec
Traffic Level
Low Season

Key Connections

Washington Ronald Reagan National (DCA)
Chicago O'Hare (ORD)
New York John F Kennedy (JFK)
Philadelphia (PHL)
Atlanta Hartsfield Jackson (ATL)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is December a Good Time to Visit Boston?

👍Great time to visit - recommended
Short Answer

Boston's December averages 5°C - cold but manageable with proper attire. Lower tourism (79% of peak) means better prices and fewer queues.

Decision Factors

Cold weather expected

5°C average highs

Cold sea - swimming challenging

6.1°C sea temperature - Polar Plunge

Shoulder season - balanced conditions

79% of peak - good value with moderate crowds

Exceptional dining scene

26 Michelin-listed restaurants

Good For

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

  • 🌡️
    Heat-sensitive visitors

    Manageable 5°C without oppressive humidity

Who Should Avoid

  • 🏖️
    Beach lovers

    Sea temperature only 6.1°C - too cold for comfortable swimming

  • 💑
    Honeymoon couples

    Wedding score only 36/100 - better months available

930 observations30-year historical data
Confidence: 99%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Boston in December averages 5°C with 26% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Boston in December

What are the temperatures in Boston in December?

Daytime highs average 5°C, nights drop to -3°C. Temperatures remain fairly consistent.

How many rainy days in Boston in December?

Expect around 15 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Boston in December?

Warm winter clothing: insulated jacket, boots, gloves.

Is December peak season in Boston?

This is shoulder season—moderate prices and manageable crowds.