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
December signals a slight drop in average high-temperature, sliding from November's cool 51.3°F (10.7°C) to a frosty 43.7°F (6.5°C). South Yarmouth notes a consistent average low-temperature of 36.9°F (2.7°C) during December nights.Humidity
In South Yarmouth, the average relative humidity in December is 75%.Rainfall
In South Yarmouth, Massachusetts, in December, during 10.8 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In South Yarmouth, during the entire year, the rain falls for 129 days and collects up to 14.21" (361mm) of precipitation.Snowfall
January through April and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 4.5 snowfall days, it receives 0.39" (10mm) of snow. Throughout the year, in South Yarmouth, there are 20.8 snowfall days, and 2.6" (66mm) of snow is accumulated.Ocean temperature
In South Yarmouth, the average seawater temperature in December is 46°F (7.8°C).Note: Swimming in 46°F (7.8°C) feels unbearing at 55.4°F (13°C) and can be life-risking below 50°F (10°C), causing breathing issues and cold shock, depending on a person's capacity.
Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in South Yarmouth.On the first day of December in South Yarmouth, sunrise is at 6:48 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 4:20 pm EST.
Sunshine
The months with the least sunshine are February and December, with an average of 4.6h of sunshine.UV index
The months with the lowest UV index in South Yarmouth are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: An average maximum UV index of 2 in December leads to these recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. When the Sun is at its strongest around midday, find shade and limit exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
Is it cold in South Yarmouth during December?
What is the average humidity in December in South Yarmouth?
How many days does it rain in December in South Yarmouth?
When does it start to snow in South Yarmouth?
What is the ocean temperature in December in South Yarmouth?
What is the month with the shortest days in South Yarmouth?
What is the average length of the day in December in South Yarmouth?
When is the sunrise / sunset in December in South Yarmouth?
What are the months with the least sunshine in South Yarmouth?
How many hours of sunshine does South Yarmouth have in December?
What is the month with the lowest UV index in South Yarmouth?
What is the UV index intensity in December in South Yarmouth?
Average temperature in December
South Yarmouth, MA
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is August (72.1°F).
The month with the lowest average high temperature is January (38.5°F).
- Average low temperature in December: 36.9°F
The month with the highest average low temperature is August (68.5°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in December
South Yarmouth, MA
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
South Yarmouth, MA
- Average wind speed in December: 16.4mph
The windiest month (with the highest average wind speed) is January (16.8mph).
The calmest months (with the lowest average wind speed) are July and August (10.9mph).
Average humidity in December
South Yarmouth, MA
- Average humidity in December: 75%
The months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (74%).
Average rainfall in December
South Yarmouth, MA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is October (1.93").
The driest month (with the least rainfall) is August (0.94").
Average rainfall days in December
South Yarmouth, MA
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is February (8.3 days).
Average snowfall in December
South Yarmouth, MA
- Average snowfall in December: 0.39"
The month with the highest snowfall is January (0.87").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days in December
South Yarmouth, MA
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
South Yarmouth, MA
- Average sea temperature in December: 46.1°F
The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).
Average daylight in December /
Average sunshine in December
South Yarmouth, MA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).
Average sunshine days in December
South Yarmouth, MA
- Average sunshine days in December: 15.3 days
The month with the most sunshine days is September (18.6 days).
The month with the least sunshine days is February (14.3 days).
Average UV index in December
South Yarmouth, MA
- Average UV index in December: 2
The months with the highest UV index are 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
South Yarmouth, MA
- Average cloud cover in December: 51
The month with the most cloud cover is December (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
South Yarmouth, MA
- 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).
South Yarmouth, Massachusetts, USA
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