Stamford

Connecticut Weather in December

Average temperatures, rainfall, sunshine and the best places to visit in Connecticut, the United States of America in December.

Planning a trip to Connecticut, the United States of America this December? Here's what you need to know about the weather:

What to Expect in Connecticut in December

Connecticut, the United States of America is a region in the United States of America. December in Connecticut generally has cold temperatures, with high precipitation. December falls during the winter season.

Temperatures

The average maximum temperatures are cold and range 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.

For a closer look at conditions across Connecticut, the United States of America, refer to the map below.

Precipitation

In December, precipitation varies across different areas. From high snow/rainfall in Stamford with an average of 115 mm (4.5 in) to high snow/rainfall in Naugatuck with 134 mm (5.3 in). Based on climate data from the last 30 years, Mystic receives the most rainfall during this month of the year.

Average sunshine

Most places get a reasonable amount of sunshine. Take Mystic as an example - it receives around 147 hours of sunlight, offering a nice mix of sunny and partly cloudy days. Want to compare this with brighter destinations? Try our weather planner to explore your options.

Explore Connecticut by month

Pick a month to see the average temperature, rainfall and sunshine in Connecticut — and find the best time to visit. (based on Mystic)

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.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Connecticut

What is the weather like in December for some of the most popular destinations in Connecticut, the United States of America?

Temperature range in Connecticut (December)

Precipitation variation in Connecticut (December)

Mystic

In December Mystic generally has low temperatures with maximum daytime temperatures around 7°C (45°F), minimum nighttime temperatures around -1°C (30°F) and high monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
12°C (54°F)
7°C (45°F)
4°C (39°F)
Min temperature
3°C (37°F)
-1°C (30°F)
-5°C (23°F)
Monthly sun hours
147 hours
147 hours
170 hours
Monthly snow/rainfall
94 mm (3.7 in)
127 mm (5 in)
96 mm (3.8 in)
Monthly rainy days
10 days
12 days
12 days
Weather conditions

Danbury

In December Danbury generally has low temperatures with maximum daytime temperatures around 6°C (43°F), minimum nighttime temperatures around -3°C (27°F) and high monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
11°C (52°F)
6°C (43°F)
2°C (36°F)
Min temperature
1°C (34°F)
-3°C (27°F)
-8°C (18°F)
Monthly snow/rainfall
87 mm (3.4 in)
129 mm (5.1 in)
94 mm (3.7 in)
Monthly rainy days
10 days
13 days
13 days
Weather conditions

Windsor Locks

In December Windsor Locks generally has low temperatures with maximum daytime temperatures around 6°C (43°F), minimum nighttime temperatures around -3°C (27°F) and high monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
12°C (54°F)
6°C (43°F)
2°C (36°F)
Min temperature
1°C (34°F)
-3°C (27°F)
-7°C (19°F)
Monthly sun hours
139 hours
139 hours
169 hours
Monthly snow/rainfall
85 mm (3.3 in)
118 mm (4.6 in)
86 mm (3.4 in)
Monthly rainy days
9 days
13 days
11 days
Weather conditions

Groton

In December Groton generally has low temperatures with maximum daytime temperatures around 7°C (45°F), minimum nighttime temperatures around -1°C (30°F) and high monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
12°C (54°F)
7°C (45°F)
4°C (39°F)
Min temperature
3°C (37°F)
-1°C (30°F)
-5°C (23°F)
Monthly sun hours
139 hours
139 hours
169 hours
Monthly snow/rainfall
93 mm (3.7 in)
128 mm (5 in)
97 mm (3.8 in)
Monthly rainy days
10 days
12 days
11 days
Weather conditions

Milford

In December Milford generally has low temperatures with maximum daytime temperatures around 7°C (45°F), minimum nighttime temperatures around -1°C (30°F) and high monthly snow/rainfall. So on average the conditions are poor that month.

November
December
January
Max temperature
12°C (54°F)
7°C (45°F)
4°C (39°F)
Min temperature
3°C (37°F)
-1°C (30°F)
-5°C (23°F)
Monthly sun hours
139 hours
139 hours
169 hours
Monthly snow/rainfall
84 mm (3.3 in)
126 mm (5 in)
86 mm (3.4 in)
Monthly rainy days
10 days
12 days
12 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Connecticut, in the United States of America.

Popular cities in December

Day & night temperatures, rainfall and average weather in Connecticut in December.

City Weather Day temp Night temp Rainfall
Mystic 7°C (45°F) -1°C (30°F) 127 mm (5 in)
Danbury 6°C (43°F) -3°C (27°F) 129 mm (5.1 in)
Windsor Locks 6°C (43°F) -3°C (27°F) 118 mm (4.6 in)
Groton 7°C (45°F) -1°C (30°F) 128 mm (5 in)
Milford 7°C (45°F) -1°C (30°F) 126 mm (5 in)
Norwalk 7°C (45°F) -2°C (28°F) 121 mm (4.8 in)

Connecticut weather in December: frequently asked questions

What is the weather like in Connecticut, the United States of America in December?

Connecticut, the United States of America typically experiences poor weather in December, part of the winter season. Daytime highs in Mystic average around 7°C (45°F), and temperatures drop to about -1°C (30°F) at night.

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

Mystic averages a daytime maximum of 7°C (45°F) in December, with overnight lows close to -1°C (30°F).

Does Connecticut, the United States of America get a lot of snow/rain in December?

Mystic typically receives notable snow/rainfall in December, about 127 mm (5 in) on average across Connecticut, the United States of America.

Is December a Good Time to Visit Connecticut, the United States of America?

Given the typically poor weather conditions in Mystic, December may not be the ideal time to visit Connecticut, the United States of America.

Generally speaking, August and September provide perfect weather in Mystic. In contrast, January, February, March and December tend to have poor weather conditions.

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.