December weather forecast and climate
Barnstable, MA

Weather in December

The first month of the winter, December, is still a chilly month in Barnstable, Massachusetts, with average temperature ranging between min 36.7°F (2.6°C) and max 43.5°F (6.4°C).

Temperature

In December, the average high-temperature marginally drops, from a cool 51.1°F (10.6°C) in November, to a frosty 43.5°F (6.4°C). The average low-temperature, in Barnstable, is 36.7°F (2.6°C).

Humidity

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

Rainfall

In Barnstable, during December, the rain falls for 11 days and regularly aggregates up to 1.38" (35mm) of precipitation. In Barnstable, during the entire year, the rain falls for 129.6 days and collects up to 13.94" (354mm) of precipitation.

Snowfall

January through April and December are months with snowfall. December is the first month it typically snows in Barnstable. Throughout December, in the average 4.2 snowfall days, it receives 0.43" (11mm) of snow. In Barnstable, Massachusetts, during the entire year, snow falls for 21.6 days, and aggregates up to 2.17" (55mm) of snow.

Ocean temperature

In Barnstable, the average seawater temperature in December is 46°F (7.8°C).
Note: 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.

Daylight

The month with the shortest days in Barnstable is December, with an average of 9.2h of daylight.

Sunshine

With an average of 4.6h of sunshine, December has the least sunshine of the year.

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 hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Barnstable?

In Barnstable, Massachusetts, the average relative humidity in December is 75%.

How much does it rain in Barnstable in December?

In Barnstable, in December, it is raining for 11 days, with typically 1.38" (35mm) of accumulated precipitation.

When does it start to snow in Barnstable?

December is the first month it typically snows in Barnstable, Massachusetts. Throughout December, in the average 4.2 snowfall days, it receives 0.43" (11mm) of snow.

What is the ocean temperature in December in Barnstable?

In Barnstable, Massachusetts, in December, the average water 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 in Barnstable?

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

What is the average length of the day in December in Barnstable?

In December, the average length of the day in Barnstable, Massachusetts, is 9.2h.

What is the month with the least sunshine in Barnstable?

December has the least sunshine of the year, with an average of 4.6h of sunshine.

How long on average sun shines in December in Barnstable?

The average sunshine in December is 4.6h.

What is the month with the lowest UV index in Barnstable?

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

How high is the UV index in December in Barnstable?

In Barnstable, Massachusetts, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in December
Barnstable, MA

Average temperature in December - Barnstable, MA
  • Average high temperature in December: 43.5°F

The warmest month (with the highest average high temperature) is August (72.5°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in December: 36.7°F

The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).

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Average pressure in December
Barnstable, MA

Average pressure in December - Barnstable, 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
Barnstable, MA

Average wind speed in December - Barnstable, MA
  • Average wind speed in December: 15.8mph

The windiest month (with the highest average wind speed) is January (16.4mph).
The calmest month (with the lowest average wind speed) is August (10.4mph).

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Average humidity in December
Barnstable, MA

Average humidity in December - Barnstable, MA
  • Average humidity in December: 75%

Months with the highest relative humidity are May, June and July (83%).
The month with the lowest relative humidity is November (74%).

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Average rainfall in December
Barnstable, MA

Average rainfall in December - Barnstable, MA
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is October (1.89").
The driest month (with the least rainfall) is August (0.94").

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Average rainfall days in December
Barnstable, MA

Average rainfall days in December - Barnstable, MA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is February (8.1 days).

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Average snowfall in December
Barnstable, MA

Average snowfall in December - Barnstable, MA
  • Average snowfall in December: 0.43"

Months with the highest snowfall are January and February (0.63").
Months with the least snowfall are May, June, July, August, September, October and November (0").

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Average snowfall days in December
Barnstable, MA

Average snowfall days in December - Barnstable, MA
  • Average snowfall days in December: 4.2 days

The month with the highest number of snowfall days is January (6.6 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in December
Barnstable, MA

Average sea temperature in December - Barnstable, 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
Barnstable, MA

Average daylight in December / Average sunshine in December - Barnstable, 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).
The month with the least sunshine is December (Average sunshine: 4.6h).

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Average sunshine days in December
Barnstable, MA

Average sunshine days in December - Barnstable, MA
  • Average sunshine days in December: 15.7 days

The month with the most sunshine days is September (18.5 days).
The month with the least sunshine days is February (14.8 days).

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Average UV index in December
Barnstable, MA

Average UV index in December - Barnstable, 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
Barnstable, MA

Average cloud cover in December - Barnstable, MA
  • Average cloud cover in December: 50

Months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in December
Barnstable, MA

Average visibility in December - Barnstable, 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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