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 reveals a small adjustment in temperature, transitioning from an average high of a cool 50.9°F (10.5°C) in November to an icy 42.4°F (5.8°C). Mattapoisett's nights in December cool down to an average low-temperature of 33.3°F (0.7°C).Humidity
In December, the average relative humidity is 76%.Rainfall
In Mattapoisett, in December, it is raining for 9.5 days, with typically 1.69" (43mm) of accumulated precipitation. In Mattapoisett, during the entire year, the rain falls for 133.2 days and collects up to 17.2" (437mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In December, it is snowing for 3.2 days. Throughout December, 0.79" (20mm) of snow is accumulated. Throughout the year, in Mattapoisett, there are 21.4 snowfall days, and 5.87" (149mm) of snow is accumulated.Ocean temperature
In Mattapoisett, the average seawater temperature in December is 46.9°F (8.3°C).Note: Beware when you're in 46.9°F (8.3°C) waters; 55.4°F (13°C) is chilling and anything below 50°F (10°C) could cause breathing hindrance and a sudden cold shock, given your physical condition.
Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:51 am and sunset at 4:13 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 4:23 pm EST.
Sunshine
In Mattapoisett, the average sunshine in December is 4.9h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.Note: The UV index of 2 during December translates into the following guidance:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the average humidity in December in Mattapoisett?
How many days does it rain in December in Mattapoisett?
How many days does it snow in December?
How cold is the water in December?
What is the month with the shortest days?
How many hours of daylight does Mattapoisett have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Mattapoisett have in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Mattapoisett, MA
- Average high temperature in December: 42.4°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (36.3°F).
- Average low temperature in December: 33.3°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in December
Mattapoisett, MA
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Mattapoisett, MA
- Average wind speed in December: 11.2mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (8mph).
Average humidity in December
Mattapoisett, MA
- Average humidity in December: 76%
The months with the highest relative humidity are June and July (80%).
The months with the lowest relative humidity are March, April and November (74%).
Average rainfall in December
Mattapoisett, MA
- Average rainfall in December: 1.69"
The wettest month (with the highest rainfall) is October (1.93").
The driest month (with the least rainfall) is September (1.06").
Average rainfall days in December
Mattapoisett, MA
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is July (13.4 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in December
Mattapoisett, MA
- Average snowfall in December: 0.79"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mattapoisett, MA
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is January (6.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in December
Mattapoisett, MA
- Average sea temperature in December: 46.9°F
The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).
Average daylight in December /
Average sunshine in December
Mattapoisett, 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 5min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Mattapoisett, MA
- Average sunshine days in December: 18.3 days
The months with the most sunshine days are November and December (18.3 days).
The month with the least sunshine days is April (14.4 days).
Average UV index in December
Mattapoisett, MA
- 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
Mattapoisett, MA
- Average cloud cover in December: 47
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Mattapoisett, 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).
Mattapoisett, Massachusetts, USA
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