December weather forecast
East Dennis, MA

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Weather in December

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

Temperature

In the transition to December, East Dennis observes a minor drop in 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, in December, registers an average low temperature of 36.9°F (2.7°C), showing a minute reduction from daily highs.

Humidity

The average relative humidity in December is 75%.

Rainfall

In December, in East Dennis, the rain falls for 10.8 days. Throughout December, 1.38" (35mm) of precipitation is accumulated. 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 are January through April and December. December is the first month it typically snows. Throughout December, in the average 4.5 snowfall days, it receives 0.39" (10mm) of snow. In East Dennis, during the entire year, snow falls for 20.8 days and aggregates up to 2.6" (66mm) of snow.

Ocean temperature

In East Dennis, the average seawater temperature in December is 46°F (7.8°C).
Note: Engaging in a swim in 46°F (7.8°C) can threaten life. Brief exposure to 55.4°F (13°C) waters is uneasy, and submersion below 50°F (10°C) can lead to cold shock and disrupted breathing patterns, varying by individual.

Daylight

December has the shortest days of the year, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 6:48 am and sunset at 4:10 pm. On the last day of December, sunrise is at 7:07 am and sunset at 4:20 pm EST.

Sunshine

February and December, with an average of 4.6h of sunshine, are months with the least 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 of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

In December, in East Dennis, the average high-temperature is 43.7°F (6.5°C), and the average low-temperature is 36.9°F (2.7°C).

What is the average humidity in December?

The average relative humidity in December is 75%.

How many days does it rain in December?

In East Dennis, during December, the rain falls for 10.8 days and regularly aggregates up to 1.38" (35mm) of precipitation.

When does it start to snow?

December is the first month it typically snows. Throughout December, in the average 4.5 snowfall days, it receives 0.39" (10mm) of snow.

What is the water temperature in December?

In December, the average ocean temperature is 46°F (7.8°C). Swimming in 46°F (7.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

What is the average length of the day in December?

In East Dennis, Massachusetts, the average day length in December is 9h and 13min.

What time are sunrise and sunset in December?

On the first day of December in East Dennis, 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.

What is the month with the least sunshine?

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

How long on average sun shines in December?

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

When is the lowest UV index?

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

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

Average pressure in December
East Dennis, MA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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