December weather forecast
Deer Isle, ME

Weather in December

The first month of the winter, December, is still a cold month in Deer Isle, Maine, with temperature in the range of an average high of 36.7°F (2.6°C) and an average low of 27.7°F (-2.4°C).

Temperature

In December, the average high-temperature slightly decreases from a chilly 45.3°F (7.4°C) in November to a cold 36.7°F (2.6°C). In Deer Isle, the average low-temperature is 27.7°F (-2.4°C).

Humidity

In December, the average relative humidity is 78%.

Rainfall

In Deer Isle, in December, it is raining for 8.4 days, with typically 1.89" (48mm) of accumulated precipitation. Throughout the year, in Deer Isle, there are 115.5 rainfall days, and 17.95" (456mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Deer Isle are January through April, October through December. In December, in Deer Isle, Maine, it is snowing for 5.9 days. Throughout December, 1.81" (46mm) of snow is accumulated. Throughout the year, in Deer Isle, there are 29.2 snowfall days, and 9.65" (245mm) of snow is accumulated.

Ocean temperature

In Deer Isle, the average water temperature is 45.5°F (7.5°C).
Note: Swimming in 45.5°F (7.5°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

With an average of 8h and 56min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:50 am and sunset at 3:57 pm. On the last day of December, sunrise is at 7:10 am and sunset at 4:05 pm EST.

Sunshine

December has the least sunshine of the year, with an average of 4.5h of sunshine.

UV index

The months with the lowest UV index in Deer Isle 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 health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 temperature in December in Deer Isle?

The average high-temperature, in December, in Deer Isle, Maine, is 36.7°F (2.6°C), while the average low-temperature is 27.7°F (-2.4°C).

What is the average humidity in December in Deer Isle?

The average relative humidity in December in Deer Isle, Maine, is 78%.

How many days does it rain in December in Deer Isle?

In Deer Isle, during December, the rain falls for 8.4 days and regularly aggregates up to 1.89" (48mm) of precipitation.

How much does it snow in Deer Isle in December?

In Deer Isle, in December, snow falls for 5.9 days, with typically accumulated 1.81" (46mm) of snow.

What is the water temperature in December in Deer Isle?

In Deer Isle, Maine, the average seawater temperature in December is 45.5°F (7.5°C). Swimming in 45.5°F (7.5°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 Deer Isle?

The month with the shortest days in Deer Isle, Maine, is December, with an average of 8h and 56min of daylight.

How many hours of daylight does Deer Isle have in December?

In Deer Isle, the average day length in December is 8h and 56min.

What time are sunrise and sunset in December in Deer Isle?

On the first day of December in Deer Isle, Maine, sunrise is at 6:50 am and sunset at 3:57 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 4:05 pm EST.

What is the month with the least sunshine in Deer Isle?

December has the least sunshine of the year in Deer Isle, with an average of 4.5h of sunshine.

How many hours of sunshine does Deer Isle have in December?

The average sunshine duration in December is 4.5h.

What is the month with the lowest UV index in Deer Isle?

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

What is the UV index reading in December in Deer Isle?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents 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
Deer Isle, ME

Average temperature in December - Deer Isle, ME
  • Average high temperature in December: 36.7°F

The warmest month (with the highest average high temperature) is August (68.9°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in December: 27.7°F

The month with the highest average low temperature is August (59.9°F).
The coldest month (with the lowest average low temperature) is January (21°F).

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Average pressure in December
Deer Isle, ME

Average pressure in December - Deer Isle, 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
Deer Isle, ME

Average wind speed in December - Deer Isle, ME
  • Average wind speed in December: 13.9mph

The windiest month (with the highest average wind speed) is January (14.4mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).

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Average humidity in December
Deer Isle, ME

Average humidity in December - Deer Isle, ME
  • Average humidity in December: 78%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is November (76%).

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Average rainfall in December
Deer Isle, ME

Average rainfall in December - Deer Isle, ME
  • Average rainfall in December: 1.89"

The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is September (0.91").

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Average rainfall days in December
Deer Isle, ME

Average rainfall days in December - Deer Isle, ME
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is July (12.8 days).
The month with the least rainy days is February (5.3 days).

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Average snowfall in December
Deer Isle, ME

Average snowfall in December - Deer Isle, ME
  • Average snowfall in December: 1.81"

The month with the highest snowfall is February (2.32").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Deer Isle, ME

Average snowfall days in December - Deer Isle, ME
  • Average snowfall days in December: 5.9 days

The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in December
Deer Isle, ME

Average sea temperature in December - Deer Isle, ME
  • Average sea temperature in December: 45.6°F

The best month for swimming (with the highest average sea temperature) is August (58.6°F).
The coldest month (with the lowest average sea temperature) is March (38.2°F).

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Average daylight in December /
Average sunshine in December
Deer Isle, ME

Average daylight in December / Average sunshine in December - Deer Isle, ME
  • Average daylight in December: 8h and 56min

The month with the longest days is June (Average daylight: 15h and 28min).
The month with the shortest days is December (Average daylight: 8h and 56min).

  • Average sunshine in December: 4h and 30min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 30min).

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Average sunshine days in December
Deer Isle, ME

Average sunshine days in December - Deer Isle, ME
  • Average sunshine days in December: 16.3 days

The month with the most sunshine days is September (19.9 days).
The month with the least sunshine days is July (15.4 days).

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Average UV index in December
Deer Isle, ME

Average UV index in December - Deer Isle, 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
Deer Isle, ME

Average cloud cover in December - Deer Isle, ME
  • Average cloud cover in December: 51

The months with the most cloud cover are February and March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in December
Deer Isle, ME

Average visibility in December - Deer Isle, ME
  • Average visibility in December: 6mi

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

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