Temperature in Connecticut in December

Daytime highs, nighttime lows and the warmest cities in Connecticut, the United States of America this December.

Connecticut, the United States of America, a region in the United States of America, experiences low average maximum daytime temperatures in December, ranging from 4°C (39°F) in Cornwall Bridge to 8°C (46°F) in Old Saybrook. Nighttime temperatures generally drop to -1°C (30°F) in Old Saybrook and -5°C (23°F) in Cornwall Bridge. December is a winter month.

What is the temperature of the different cities in Connecticut, the United States of America in December?

Explore the map below to discover average December temperatures at the top destinations in Connecticut. For a deeper dive, simply click on any destination dot.

Select a Month

Check the conditions for any month of the year.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

For a detailed overview over the year and the best time to visit Connecticut, check out our Connecticut's climate page.

See also: Connecticut weather by month.

Best Places to Visit in Connecticut in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Connecticut.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in December: blue is cold, red is hot.

See all December weather averages, cities and regions in Connecticut

Connecticut temperatures in December: frequently asked questions

How hot does it get in Connecticut, the United States of America in December?

Daytime temperatures in Mystic typically peak at 7°C (45°F) in December, putting it in the low range.

How cold does it get at night in Connecticut, the United States of America in December?

After dark, Mystic cools to about -1°C (30°F) on an average December night.

What is the warmest city in December in Connecticut, the United States of America?

According to our recent database analysis, Old Saybrook is the warmest city. It experiences an average maximum daytime temperature of approximately 8°C (46°F) and rarely drops below -1°C (30°F) during the night.

What is the coldest city in December in Connecticut, the United States of America?

The coldest city in December in Connecticut, the United States of America is Cornwall Bridge when we check our database. The maximum daytime temperatures are around 4°C (39°F) and minimum nighttime temperatures fall around -5°C (23°F).

How much sun does Connecticut, the United States of America get in December?

Most areas experience a moderate amount of sunshine, with approximately 147 hours of sunlight expected in Mystic. This makes it neither too gloomy nor overly bright.

Interested in more climate information?

We have much more information about the climate in Connecticut.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.

Yosemite National Park is definitely worth a visit

Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States

Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes

A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States

Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.
Must visit in the United States of America →