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 transition into December is accompanied by a slight temperature decrease, with the average high-temperature shifting from a fresh 51.3°F (10.7°C) in November to a chilly 43.7°F (6.5°C). East Dennis's nighttime temperature in December experiences a slight dip from daytime highs, falling to an average of 36.9°F (2.7°C).Humidity
In December, the average relative humidity is 75%.Rainfall
In East Dennis, in December, it is raining for 10.8 days, with typically 1.38" (35mm) of accumulated precipitation. In East Dennis, during the entire year, the rain falls for 129 days and collects up to 14.21" (361mm) of precipitation.Snowfall
Months with snowfall in East Dennis are January through April and December. December is the first month it typically snows in East Dennis. Throughout December, in the average 4.5 snowfall days, it receives 0.39" (10mm) of snow. Throughout the year, in East Dennis, there are 20.8 snowfall days, and 2.6" (66mm) of snow is accumulated.Ocean temperature
In East Dennis, 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
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 6:48 am and sunset at 4:10 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
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
How cold is it in East Dennis in December?
What is the average humidity in December in East Dennis?
How much does it rain in East Dennis in December?
When does it start snowing in East Dennis?
How cold is the water in December in East Dennis?
What is the month with the shortest days in East Dennis?
What is the average length of the day in December in East Dennis?
When are sunrise and sunset in December in East Dennis?
What is the month with the least sunshine in East Dennis?
How many hours of sunshine does East Dennis have in December?
What is the month with the lowest UV index in East Dennis?
How high is the UV index in December in East Dennis?
Average temperature in December
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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
East Dennis, 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).
East Dennis, Massachusetts, USA
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