Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The onset of December coincides with a reduction in the average high-temperature, falling from a cool 50.9°F (10.5°C) in November to a cold 41.9°F (5.5°C). A modest decline from daytime high temperatures in Old Greenwich is noticed in December, marking the average low at 33.4°F (0.8°C).Humidity
The months with the highest humidity are February, May, June and December, with an average relative humidity of 75%.Rainfall
In Old Greenwich, in December, it is raining for 12.4 days, with typically 4.09" (104mm) of accumulated precipitation. In Old Greenwich, during the entire year, the rain falls for 166.6 days and collects up to 38.07" (967mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In December, in Old Greenwich, it is snowing for 4.4 days. Throughout December, 1.81" (46mm) of snow is accumulated. Throughout the year, there are 24.8 snowfall days, and 9.33" (237mm) of snow is accumulated.Ocean temperature
In Old Greenwich, in December, the average water temperature is 47.1°F (8.4°C).Note: Entering waters of 47.1°F (8.4°C) is life-endangering. A mere moment in 55.4°F (13°C) waters feels piercing cold, and below 50°F (10°C) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.
Daylight
The month with the shortest days in Old Greenwich is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:26 pm. On the last day of December, in Old Greenwich, sunrise is at 7:19 am and sunset at 4:36 pm EST.
Sunshine
The months with the least sunshine are February and December, with an average of 4.7h of sunshine.UV index
The months with the lowest UV index in Old Greenwich are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Frequently asked questions
Is December cold in Old Greenwich?
What is the most humid month in Old Greenwich?
What is the average humidity in December in Old Greenwich?
How much does it rain in Old Greenwich in December?
How much does it snow in Old Greenwich in December?
What is the ocean temperature in December in Old Greenwich?
What is the month with the shortest days in Old Greenwich?
What is the average length of the day in December in Old Greenwich?
When are sunrise and sunset in December in Old Greenwich?
What are the months with the least sunshine in Old Greenwich?
How many hours of sunshine does Old Greenwich have in December?
When is the lowest UV index in Old Greenwich?
How high is the UV index in December in Old Greenwich?
Average temperature in December
Old Greenwich, CT
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 33.4°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure in December
Old Greenwich, CT
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Old Greenwich, 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
Old Greenwich, CT
- Average humidity in December: 75%
The months with the highest relative humidity are February, May, June and December (75%).
The month with the lowest relative humidity is August (71%).
Average rainfall in December
Old Greenwich, CT
- Average rainfall in December: 4.09"
The wettest month (with the highest rainfall) is July (4.13").
The driest month (with the least rainfall) is January (2.44").
Average rainfall days in December
Old Greenwich, CT
- Average rainfall days in December: 12.4 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.6 days).
Average snowfall in December
Old Greenwich, CT
- Average snowfall in December: 1.81"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Old Greenwich, CT
- Average snowfall days in December: 4.4 days
The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
Old Greenwich, 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
Old Greenwich, CT
- Average daylight in December: 9h and 2min
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 4min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).
Average sunshine days in December
Old Greenwich, CT
- Average sunshine days in December: 14.8 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in December
Old Greenwich, 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
Old Greenwich, 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
Old Greenwich, 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).
Old Greenwich, Connecticut, USA
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