December weather forecast
Bar Harbor, ME

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The popular tourist spot of Bar Harbor in Maine, within the Mount Desert Island
The popular tourist spot of Bar Harbor in Maine, within the Mount Desert Island

Weather in December

December welcomes winter in Bar Harbor with noticeably colder temperatures and an increase in snowfall to 3.78" (96mm). It reinforces the chilly setting coupled with the festive spirit of the holidays. Winter activities reignite with an increase in the snowfall days. The shortened daylight hours and overall winter conditions create a serene atmosphere in the city. As the year concludes, visitors can enjoy the pleasure of a winter wonderland.

Temperature

Observing a mild shift, the average high-temperature during December reduces from November's chilly 44.8°F (7.1°C) to a wintry 35.1°F (1.7°C). Bar Harbor records an average low-temperature of 25.7°F (-3.5°C) throughout the month of December.

Humidity

In December, the average relative humidity in Bar Harbor is 78%.

Rainfall

December is the month with the most rainfall. Rain falls for 11.5 days and accumulates 3.94" (100mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 7.9 days. Throughout December, 3.78" (96mm) of snow is accumulated. In Bar Harbor, during the entire year, snow falls for 48.1 days and aggregates up to 23.82" (605mm) of snow.

Ocean temperature

In December, the average ocean temperature is 46°F (7.8°C).
Note: While a brief time in 46°F (7.8°C) at 55.4°F (13°C) is already bracing, plunging below 50°F (10°C) can severely affect breathing and introduce a cold shock, relying on your physical state.

Daylight

December has the shortest days of the year, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 6:49 am and sunset at 3:54 pm. On the last day of December, in Bar Harbor, sunrise is at 7:08 am and sunset at 4:03 pm EST.

Sunshine

The average sunshine in December is 4.4h.

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 average individuals.
Note: The UV index of 2 in December translates into these instructions:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
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Frequently asked questions

How cold is it in Bar Harbor in December?

In December, in Bar Harbor, the average high-temperature is 35.1°F (1.7°C), and the average low-temperature is 25.7°F (-3.5°C).

What is the average humidity in December in Bar Harbor?

The average relative humidity in December in Bar Harbor, Maine, is 78%.

What is the rainiest month in Bar Harbor?

December is the month with the most rainfall in Bar Harbor, Maine. Rain falls for 11.5 days and accumulates 3.94" (100mm) of precipitation.

How much does it rain in Bar Harbor in December?

In December, in Bar Harbor, Maine, the rain falls for 11.5 days. Throughout December, 3.94" (100mm) of precipitation is accumulated.

How many days does it snow in December in Bar Harbor?

In Bar Harbor, in December, during 7.9 snowfall days, 3.78" (96mm) of snow is typically accumulated.

How cold is the water in December in Bar Harbor?

In Bar Harbor, 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 Bar Harbor?

The month with the shortest days in Bar Harbor is December, with an average of 8h and 54min of daylight.

How many hours of daylight does Bar Harbor have in December?

In December, the average day length in Bar Harbor is 8h and 55min.

When is the sunrise / sunset in December in Bar Harbor?

In December, on the first day of the month, sunrise is at 6:49 am and sunset at 3:54 pm. On the last day of the month, in Bar Harbor, Maine, sunrise is at 7:08 am and sunset at 4:03 pm EST.

How long on average sun shines in December in Bar Harbor?

In December, the average sunshine duration in Bar Harbor is 4.4h.

When is the lowest UV index in Bar Harbor?

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 Bar Harbor?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to the Sun's 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
Bar Harbor, ME

Average temperature in December - Bar Harbor, ME
  • Average high temperature in December: 35.1°F

The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

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Average pressure in December
Bar Harbor, ME

Average pressure in December - Bar Harbor, ME
  • Average pressure in December: 29.99"Hg

The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Bar Harbor, ME

Average wind speed in December - Bar Harbor, ME
  • Average wind speed in December: 10.1mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

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Average humidity in December
Bar Harbor, ME

Average humidity in December - Bar Harbor, ME
  • Average humidity in December: 78%

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is November (76%).

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Average rainfall in December
Bar Harbor, ME

Average rainfall in December - Bar Harbor, ME
  • Average rainfall in December: 3.94"

The wettest month (with the highest rainfall) is December (3.94").
The driest month (with the least rainfall) is July (1.57").

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Average rainfall days in December
Bar Harbor, ME

Average rainfall days in December - Bar Harbor, ME
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is April (15.5 days).
The month with the least rainy days is February (7.5 days).

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Average snowfall in December
Bar Harbor, ME

Average snowfall in December - Bar Harbor, ME
  • Average snowfall in December: 3.78"

The month with the highest snowfall is February (5.75").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Bar Harbor, ME

Average snowfall days in December - Bar Harbor, ME
  • Average snowfall days in December: 7.9 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
Bar Harbor, ME

Average sea temperature in December - Bar Harbor, ME
  • Average sea temperature in December: 46°F

The best month for swimming (with the highest average sea temperature) is August (56.8°F).
The coldest month (with the lowest average sea temperature) is March (38.6°F).

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Average daylight in December /
Average sunshine in December
Bar Harbor, ME

Average daylight in December / Average sunshine in December - Bar Harbor, ME
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 4h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).

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Average sunshine days in December
Bar Harbor, ME

Average sunshine days in December - Bar Harbor, ME
  • Average sunshine days in December: 14.1 days

The month with the most sunshine days is August (18.7 days).
The month with the least sunshine days is April (11.2 days).

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Average UV index in December
Bar Harbor, ME

Average UV index in December - Bar Harbor, ME
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 5).
The 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
Bar Harbor, ME

Average cloud cover in December - Bar Harbor, ME
  • Average cloud cover in December: 53

The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 35).

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Average visibility in December
Bar Harbor, ME

Average visibility in December - Bar Harbor, ME
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

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Bar Harbor, Maine, USA

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