Connecticut
United States of America
Temperature in December

Temperature in Connecticut in 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.

Connecticut Weather by Month

Pick a month to see the average temperature, rainfall and sunshine in Connecticut - and find the best time to visit. See also: Connecticut weather by month.

January4°C (39°F) February4°C (39°F) March8°C (46°F) April14°C (57°F) May19°C (66°F) June23°C (73°F) July27°C (81°F) August26°C (79°F) September23°C (73°F) This monthOctober18°C (64°F) November12°C (54°F) December7°C (45°F)
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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.

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