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

As November transitions to December, the average high-temperature falls from a chilly 44.8°F (7.1°C) to a wintry 35.1°F (1.7°C). Bar Harbor, in December, witnesses an average low-temperature of 25.7°F (-3.5°C).

Humidity

In December, the average relative humidity 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

Months with snowfall are January through May, October through December. In Bar Harbor, in December, during 7.9 snowfall days, 3.78" (96mm) of snow is typically 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 Bar Harbor, in December, the average water temperature is 46°F (7.8°C).
Note: Dipping in 46°F (7.8°C) at temperatures less than 50°F (10°C) without proper gear can lead to pronounced cold shock and breathing difficulties.

Daylight

December has the shortest days of the year, with an average of 8h and 54min of daylight.
On the first day of December, sunrise is at 6:49 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 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 value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: A daily high UV index of 2 in December leads to these guidelines:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Updated: Aug 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is 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 is 78%.

What is the rainiest month?

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

How many days does it rain in December?

In December, 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.

What is the ocean temperature in December?

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

What is the month with the shortest days?

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

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

In Bar Harbor, the average day length in December 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, sunrise is at 7:08 am and sunset at 4:03 pm EST.

How long on average sun shines in December?

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

What is the month with the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

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).

Bar Harbor, Maine, USA

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