December weather forecastStamford, CT
December
Weather in December
As the final chapter of the year in Stamford, December presents its coldest weather conditions. With a chilly 41.9°F (5.5°C) average temperature, a marked increase in snowfall compared to November is observed. Conditions tend to favor indoor activities as the month progresses. A unique attribute of December is the relatively high amount of rainfall it hosts. As the curtain falls on the year, Stamford bid adieu under a carpet of white, welcoming the new year with open arms.Temperature
In December, the average high-temperature goes from a fresh 50.9°F (10.5°C) in November to a cold 41.9°F (5.5°C). A consistent nighttime average temperature of 33.3°F (0.7°C) is maintained during December.Humidity
February, May, June and December, with an average relative humidity of 75%, are the most humid months.Rainfall
In Stamford, during December, the rain falls for 11.6 days and regularly aggregates up to 3.94" (100mm) of precipitation. Throughout the year, there are 164.1 rainfall days, and 37.95" (964mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Stamford, in December, during 3.9 snowfall days, 1.65" (42mm) of snow is typically accumulated. In Stamford, during the entire year, snow falls for 23.2 days and aggregates up to 8.66" (220mm) of snow.Ocean temperature
In Stamford, the average seawater temperature in December is 47.1°F (8.4°C).Note: Dipping into 47.1°F (8.4°C) below 50°F (10°C) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 55.4°F (13°C) can be jarring.
Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:00 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:35 pm EST.
Sunshine
The average sunshine in December is 4.8h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Stamford. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.Note: The UV index of 2 during December translates into the following guidance:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Stamford, CT
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 33.3°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).
Average pressure in December
Stamford, CT
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Stamford, CT
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in December
Stamford, CT
- Average humidity in December: 75%
The months with the highest relative humidity are February, May, June and December (75%).
The months with the lowest relative humidity are April, August and November (72%).
Average rainfall in December
Stamford, CT
- Average rainfall in December: 3.94"
The wettest month (with the highest rainfall) is July (4.25").
The driest months (with the least rainfall) are January and February (2.36").
Average rainfall days in December
Stamford, CT
- Average rainfall days in December: 11.6 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Stamford, CT
- Average snowfall in December: 1.65"
The months with the highest snowfall are February and March (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Stamford, CT
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in December
Stamford, CT
- Average sea temperature in December: 47.1°F
The best month for swimming (with the highest average sea temperature) is August (73.1°F).
The coldest month (with the lowest average sea temperature) is February (39.5°F).
Average daylight in December /
Average sunshine in December
Stamford, CT
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Stamford, CT
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in December
Stamford, CT
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Stamford, CT
- Average cloud cover in December: 49
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Stamford, CT
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
