December weather forecast
West Dennis, MA

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Weather in December

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

Temperature

December indicates a minor shift in the average high-temperature, from November's fresh 51.3°F (10.7°C) to a chilly 43.7°F (6.5°C). West Dennis in December observes a slight diminution in temperature from daily highs, recording a low-temperature average of 36.9°F (2.7°C).

Humidity

In December, the average relative humidity in West Dennis is 75%.

Rainfall

In West Dennis, in December, during 10.8 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In West 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. Throughout December, in the average 4.5 snowfall days, it receives 0.39" (10mm) of snow. Throughout the year, there are 20.8 snowfall days, and 2.6" (66mm) of snow is accumulated.

Ocean temperature

In West Dennis, the average seawater temperature in December is 46°F (7.8°C).
Note: Dipping into 46°F (7.8°C) below 50°F (10°C) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 55.4°F (13°C) can be jarring.

Daylight

The month with the shortest days is December, 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 4:11 pm. On the last day of December, 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 are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.
Note: In December, a daily UV index of 2 turns into the following recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.

Frequently asked questions

Is it cold in West Dennis during December?

An average high-temperature, in December, in West Dennis, 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?

In West Dennis, the average relative humidity in December is 75%.

How much does it rain in December?

In December, the rain falls for 10.8 days. Throughout December, 1.38" (35mm) of precipitation is accumulated.

When does it start snowing?

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 West Dennis?

In December, the average ocean temperature is 46°F (7.8°C). 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.

What is the month with the shortest days?

With an average of 9h and 12min of daylight, December has the shortest days of the year.

How many hours of daylight does West Dennis have in December?

In December, the average day length is 9h and 13min.

When are sunrise and sunset in December?

In December, on the first day of the month, 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.

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 December, the average sunshine duration is 4.6h.

What is the month with the lowest UV index in West Dennis?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to UV radiation.
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
West Dennis, MA

Average temperature in December - West 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
West Dennis, MA

Average pressure in December - West 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
West Dennis, MA

Average wind speed in December - West 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
West Dennis, MA

Average humidity in December - West 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
West Dennis, MA

Average rainfall in December - West 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
West Dennis, MA

Average rainfall days in December - West 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
West Dennis, MA

Average snowfall in December - West 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
West Dennis, MA

Average snowfall days in December - West 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
West Dennis, MA

Average sea temperature in December - West 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
West Dennis, MA

Average daylight in December / Average sunshine in December - West 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
West Dennis, MA

Average sunshine days in December - West 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
West Dennis, MA

Average UV index in December - West 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
West Dennis, MA

Average cloud cover in December - West 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
West Dennis, MA

Average visibility in December - West 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).

West Dennis, Massachusetts, USA

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