December weather forecast and climate
West Dennis, MA

Weather in December

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

Temperature

In West Dennis, Massachusetts, the average high-temperature marginally drops, from a fresh 51.3°F (10.7°C) in November, to a chilly 43.7°F (6.5°C). In December, in West Dennis, the average low-temperature is 36.9°F (2.7°C).

Humidity

The average relative humidity in West Dennis is 75%.

Rainfall

In West Dennis, during December, the rain falls for 10.8 days and regularly aggregates up to 1.38" (35mm) of precipitation. 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 in West Dennis. 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 West Dennis, during the entire year, snow falls for 20.8 days, and aggregates up to 2.6" (66mm) of snow.

Ocean temperature

In West Dennis, in December, the average water 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

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

Sunshine

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

UV index

Months with the lowest UV index in West Dennis, Massachusetts, 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 the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 West Dennis?

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

How much does it rain in West Dennis in December?

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

When does it start to snow in West Dennis?

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

What is the ocean temperature in December in West Dennis?

In West Dennis, the average seawater temperature in December 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 in West Dennis?

With an average of 9.2h of daylight, December has the shortest days of the year in West Dennis, Massachusetts.

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

The average length of the day in December in West Dennis, Massachusetts, is 9.2h.

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

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

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

The average sunshine in December in West Dennis, Massachusetts, is 4.6h.

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

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

How high is the UV index in December in West Dennis?

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

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).

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Average pressure in December
West Dennis, MA

Average pressure in December - West 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
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).

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Average humidity in December
West Dennis, MA

Average humidity in December - West 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
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").

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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).

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

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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).
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
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).

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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: 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
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).

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Average UV index in December
West Dennis, MA

Average UV index in December - West 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
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).

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Average visibility in December
West Dennis, MA

Average visibility in December - West 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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