December weather forecast
Bar Harbor, ME

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

The first month of the winter, December, is still a cold month in Bar Harbor, Maine, with an average temperature varying between 25.7°F (-3.5°C) and 35.1°F (1.7°C).

Temperature

In Bar Harbor, the average high-temperature in December decreases from a chilly 44.8°F (7.1°C) in November to a cold 35.1°F (1.7°C). In Bar Harbor, the average low-temperature is 25.7°F (-3.5°C).

Humidity

The average relative humidity in December is 78%.

Rainfall

The month with the most rainfall in Bar Harbor is December, when the rain falls for 11.5 days and typically aggregates up to 3.94" (100mm) of precipitation.

Snowfall

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

Ocean temperature

In December, the average ocean temperature in Bar Harbor 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

The month with the shortest days in Bar Harbor is December, with an average of 8h and 55min of daylight.
On the first day of December, sunrise is at 6:48 am and sunset at 3:54 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 4:03 pm EST.

Sunshine

The average sunshine in December in Bar Harbor 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 of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 temperature in December in Bar Harbor?

In Bar Harbor, in December, 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?

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

What is the wettest month in Bar Harbor?

The month with the most rainfall in Bar Harbor is December, when the rain falls for 11.5 days and typically aggregates up to 3.94" (100mm) of precipitation.

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

In Bar Harbor, in December, during 11.5 rainfall days, 3.94" (100mm) of precipitation is typically accumulated.

How much does it snow in Bar Harbor in December?

In Bar Harbor, during December, snow falls for 7.9 days and regularly aggregates up to 3.78" (96mm) of snow.

What is the ocean temperature in December in Bar Harbor?

In Bar Harbor, Maine, 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 is December, with an average of 8h and 55min of daylight.

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

The average day length in December is 8h and 55min.

What time are sunrise and sunset in December in Bar Harbor?

On the first day of December in Bar Harbor, Maine, sunrise is at 6:48 am and sunset at 3:54 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 4:03 pm EST.

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

The average sunshine duration in December in Bar Harbor, Maine, is 4.4h.

What is the month with 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.

What is the UV index intensity in December in Bar Harbor?

In Bar Harbor, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk 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 55min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in December: 4h and 24min

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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