December weather forecast and climate
Belfast, ME

Weather in December

December, the first month of the winter, in Belfast, is still a cold month, with average temperature ranging between max 34.2°F (1.2°C) and min 24.1°F (-4.4°C).

Temperature

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

Humidity

The average relative humidity in Belfast 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

January through May, October through December are months with snowfall in Belfast. In Belfast, during 8.9 snowfall days, 2.28" (58mm) of snow is typically accumulated. 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 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 in Belfast is December, with an average of 8.9h of daylight.

Sunshine

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. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Belfast?

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

What is the rainiest month in Belfast?

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

How much does it rain in Belfast in December?

In Belfast, during December, the rain falls for 10.1 days and regularly aggregates up to 2.72" (69mm) of precipitation.

How many days does it snow in December in Belfast?

In Belfast, in December, snow falls for 8.9 days, with typically accumulated 2.28" (58mm) of snow.

What is the ocean temperature 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 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.

What is the month with the shortest days in Belfast?

December has the shortest days of the year in Belfast, with an average of 8.9h of daylight.

How many hours of daylight does Belfast have in December?

The average length of the day in December in Belfast is 8.9h.

How long on average sun shines in December in Belfast?

The average sunshine in December 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, Maine, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV radiation.

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"

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

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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%

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").
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).
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: 8.9h

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in December: 4.4h

The month with the most sunshine is August (Average sunshine: 9.9h).
The month with the least sunshine is February (Average sunshine: 4.3h).

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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

Months with the highest UV index are June, July and August (UV index 5).
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).
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

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

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