December weather forecast
Belfast, ME

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Weather in December

Winter makes its full-fledged entrance in Belfast during December. The weather becomes harsher, with cold temperatures and an increased amount of snowfall when compared to November. The month reaches its highest level of snowfall within the year - a significant 2.28" (58mm). The city morphs into a winter wonderland, with layers of snow covering streets, rooftops, and trees. Despite the cold, December’s festive spirit makes the weather conditions seem a little less harsh, offering a beautiful backdrop for ringing in the holiday season.

Temperature

December brings a drop in Belfast's average high-temperature, falling from a chilly 44.1°F (6.7°C) in November to a wintry 34.2°F (1.2°C). Belfast's nighttime temperature in December drops to an average of 24.1°F (-4.4°C).

Humidity

In December, the average relative humidity in Belfast, Maine, is 79%.

Rainfall

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

Snowfall

Months with snowfall are January through May, October through December. In Belfast, Maine, during December, snow falls for 8.9 days and regularly aggregates up to 2.28" (58mm) of snow. In Belfast, Maine, during the entire year, snow falls for 44.3 days and aggregates up to 16.81" (427mm) of snow.

Ocean temperature

In December, the average ocean temperature is 45.1°F (7.3°C).
Note: Swimming in 45.1°F (7.3°C) is deemed hazardous. Exposure to temperatures below 50°F (10°C) leads to immediate severe cold shock and hyperventilation.

Daylight

The month with the shortest days in Belfast is December, with an average of 8h and 54min of daylight.
On the first day of December, sunrise is at 6:52 am and sunset at 3:57 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 4:06 pm EST.

Sunshine

In Belfast, the average sunshine in December 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. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: An average UV index of 2 in December transforms into this advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Frequently asked questions

How cold is it in Belfast in December?

During December, Belfast experiences an average high-temperature of 34.2°F (1.2°C) and a low-temperature of 24.1°F (-4.4°C).

What is the average humidity in December in Belfast?

The average relative humidity in December is 79%.

What is the rainiest month in Belfast?

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

How many days does it rain in December in Belfast?

In Belfast, Maine, in December, during 10.1 rainfall days, 2.72" (69mm) of precipitation is typically accumulated.

How much does it snow in Belfast in December?

In Belfast, Maine, during December, snow falls for 8.9 days and regularly aggregates up to 2.28" (58mm) of snow.

How cold is the water in December in Belfast?

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

With an average of 8h and 54min of daylight, December has the shortest days of the year in Belfast, Maine.

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

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

What time are sunrise and sunset in December in Belfast?

On the first day of December in Belfast, Maine, sunrise is at 6:52 am and sunset at 3:57 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 4:06 pm EST.

How many hours of sunshine does Belfast have in December?

In Belfast, the average sunshine duration in December 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 reading in December in Belfast?

In Belfast, Maine, the average daily maximum UV index in December 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
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 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: 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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Belfast, Maine, USA

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