December weather forecast and climate
East Dennis, MA

Weather in December

December, the first month of the winter, in East Dennis, is also a frosty month, with average temperature ranging between min 36.9°F (2.7°C) and max 43.7°F (6.5°C).

Temperature

In East Dennis, the average high-temperature in December slightly decreases, from a cool 51.3°F (10.7°C) in November, to a frosty 43.7°F (6.5°C). In East Dennis, Massachusetts, in December, the average low-temperature is 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

January through April and December are months with snowfall. 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, Massachusetts, the average seawater temperature is 46°F (7.8°C).
Note: Swimming in 46°F (7.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

December has the shortest days of the year in East Dennis, with an average of 9.2h of daylight.

Sunshine

Months with the least sunshine are February and December, with an average of 4.6h of sunshine.

UV index

Months with the lowest UV index 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 vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in East Dennis?

The average relative humidity in December in East Dennis, Massachusetts, is 75%.

How much does it rain in East Dennis in December?

In East Dennis, Massachusetts, in December, it is raining for 10.8 days, with typically 1.38" (35mm) of accumulated precipitation.

When does it start snowing in East Dennis?

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.

What is the water temperature in December in East Dennis?

In East Dennis, the average seawater temperature in December is 46°F (7.8°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in East Dennis?

December has the shortest days of the year, with an average of 9.2h of daylight.

What is the average length of the day in December in East Dennis?

In December, the average length of the day in East Dennis is 9.2h.

What is the month with the least sunshine in East Dennis?

Months with the least sunshine in East Dennis, Massachusetts, are February and December, with an average of 4.6h of sunshine.

How many hours of sunshine does East Dennis have in December?

In December, the average sunshine in East Dennis is 4.6h.

When is the lowest UV index in East Dennis?

Months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in East Dennis?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV radiation.

Average temperature in December
East Dennis, MA

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).

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Average pressure in December
East Dennis, MA

Average pressure in December - East Dennis, MA
  • Average pressure in December: 30.03"

The month with the highest atmospheric pressure is November (30.06").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in December
East Dennis, MA

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).

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Average humidity in December
East Dennis, MA

Average humidity in December - East Dennis, MA
  • Average humidity in December: 75%

Months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (74%).

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Average rainfall in December
East Dennis, MA

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").

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Average rainfall days in December
East Dennis, MA

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).

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Average snowfall in December
East Dennis, MA

Average snowfall in December - East Dennis, MA
  • Average snowfall in December: 0.39"

The month with the highest snowfall is January (0.87").
Months with the least snowfall are May, June, July, August, September, October and November (0").

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Average snowfall days in December
East Dennis, MA

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).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in December
East Dennis, MA

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).

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Average daylight in December /
Average sunshine in December
East Dennis, MA

Average daylight in December / Average sunshine in December - East Dennis, MA
  • Average daylight in December: 9.2h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in December: 4.6h

The month with the most sunshine is August (Average sunshine: 10.8h).
Months with the least sunshine are February and December (Average sunshine: 4.6).

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Average sunshine days in December
East Dennis, MA

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).

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Average UV index in December
East Dennis, MA

Average UV index in December - East Dennis, MA
  • Average UV index in December: 2

Months with the highest UV index are July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
East Dennis, MA

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).

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Average visibility in December
East Dennis, MA

Average visibility in December - East Dennis, MA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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