December weather forecast
Belfast, ME

Weather in December

The first month of the winter, December, is also a wintry month in Belfast, Maine, with an average temperature fluctuating between 24.1°F (-4.4°C) and 34.2°F (1.2°C).

Temperature

In December, the average high-temperature decreases from a chilly 44.1°F (6.7°C) in November to a wintry 34.2°F (1.2°C). In December, in Belfast, the average low-temperature is 24.1°F (-4.4°C).

Humidity

In December, the average relative humidity is 79%.

Rainfall

The month with the most rainfall is December, when the rain falls for 10.1 days and typically aggregates up to 2.72" (69mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Belfast. In Belfast, snow falls for 8.9 days, with typically accumulated 2.28" (58mm) of snow. Throughout the year, in Belfast, there are 44.3 snowfall days, and 16.81" (427mm) of snow is accumulated.

Ocean temperature

In Belfast, the average seawater temperature in December is 45.1°F (7.3°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 is December, with an average of 8h and 55min of daylight.
On the first day of the month, sunrise is at 6:52 am and sunset at 3:58 pm. On the last day of December, sunrise is at 7:12 am and sunset at 4:06 pm EST.

Sunshine

In December, the average sunshine is 4.4h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Belfast, Maine. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Belfast?

In December, the average relative humidity is 79%.

What is the rainiest month in Belfast?

December is the month with the most rainfall in Belfast, Maine. Rain falls for 10.1 days and accumulates 2.72" (69mm) of precipitation.

How many days does it rain in December in Belfast?

In Belfast, in December, it is raining for 10.1 days, with typically 2.72" (69mm) of accumulated precipitation.

How many days does it snow in December in Belfast?

In December, in Belfast, it is snowing for 8.9 days. Throughout December, 2.28" (58mm) of snow is accumulated.

What is the ocean temperature in December in Belfast?

In December, the average ocean temperature in Belfast is 45.1°F (7.3°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 in Belfast?

December has the shortest days of the year, with an average of 8h and 55min of daylight.

How many hours of daylight does Belfast have in December?

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

When is the sunrise / sunset in December in Belfast?

In December, on the first day of the month, sunrise is at 6:52 am and sunset at 3:58 pm. On the last day of the month, in Belfast, Maine, sunrise is at 7:12 am and sunset at 4:06 pm EST.

How many hours of sunshine does Belfast have in December?

In December, the average sunshine duration in Belfast, Maine, is 4.4h.

When is the lowest UV index in Belfast?

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

What is the UV index intensity in December in Belfast?

In Belfast, the average daily maximum UV index in December is 2. A UV Index estimate 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
Belfast, ME

Average temperature in December - Belfast, ME
  • Average high temperature in December: 34.2°F

The warmest months (with the highest average high temperature) are July and August (73.9°F).
The month with the lowest average high temperature is January (28.4°F).

  • Average low temperature in December: 24.1°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).

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Average pressure in December
Belfast, ME

Average pressure in December - Belfast, ME
  • Average pressure in December: 30"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
Belfast, ME

Average wind speed in December - Belfast, ME
  • Average wind speed in December: 9.6mph

The windiest month (with the highest average wind speed) is March (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

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Average humidity in December
Belfast, ME

Average humidity in December - Belfast, ME
  • Average humidity in December: 79%

The months with the highest relative humidity are February and July (83%).
The month with the lowest relative humidity is November (77%).

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Average rainfall in December
Belfast, ME

Average rainfall in December - Belfast, ME
  • Average rainfall in December: 2.72"

The wettest month (with the highest rainfall) is December (2.72").
The driest months (with the least rainfall) are July and September (1.46").

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Average rainfall days in December
Belfast, ME

Average rainfall days in December - Belfast, ME
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (7.1 days).

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Average snowfall in December
Belfast, ME

Average snowfall in December - Belfast, ME
  • Average snowfall in December: 2.28"

The month with the highest snowfall is January (4.57").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Belfast, ME

Average snowfall days in December - Belfast, ME
  • Average snowfall days in December: 8.9 days

The month with the highest number of snowfall days is January (10.1 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
Belfast, ME

Average sea temperature in December - Belfast, ME
  • Average sea temperature in December: 45°F

The best month for swimming (with the highest average sea temperature) is August (60.4°F).
The coldest month (with the lowest average sea temperature) is March (37.8°F).

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Average daylight in December /
Average sunshine in December
Belfast, ME

Average daylight in December / Average sunshine in December - Belfast, 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: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

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Average sunshine days in December
Belfast, ME

Average sunshine days in December - Belfast, ME
  • Average sunshine days in December: 14.5 days

The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is April (11.7 days).

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Average UV index in December
Belfast, ME

Average UV index in December - Belfast, 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
Belfast, ME

Average cloud cover in December - Belfast, ME
  • Average cloud cover in December: 52

The month with the most cloud cover is March (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 37).

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Average visibility in December
Belfast, ME

Average visibility in December - Belfast, ME
  • Average visibility in December: 6mi

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

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