December weather forecast
Grand Isle, VT

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Weather in December

December brings the return of the all-encompassing winter to Grand Isle. The snowfall continues to increase, with averages reaching 6.34" (161mm), second only to February's record. Life slows down a bit as the town readies itself for the chill of the coming months. The holiday season, in tune with the weather, transforms the town into a magical winter wonderland, rounding off the weather cycle for the year.

Temperature

The arrival of December in Grand Isle indicates a decrease in the average high-temperature, moving from a wintry 41.9°F (5.5°C) in November to a subzero cold 30.6°F (-0.8°C). During the nights in December, Grand Isle experiences a consistent average temperature of 20.7°F (-6.3°C).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In Grand Isle, in December, it is raining for 12.3 days, with typically 2.32" (59mm) of accumulated precipitation. In Grand Isle, during the entire year, the rain falls for 176.9 days and collects up to 29.88" (759mm) of precipitation.

Snowfall

Months with snowfall in Grand Isle are January through May, October through December. In Grand Isle, in December, snow falls for 16.1 days, with typically accumulated 6.34" (161mm) of snow. Throughout the year, there are 81.9 snowfall days, and 36.77" (934mm) of snow is accumulated.

Daylight

The month with the shortest days in Grand Isle is December, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:10 am and sunset at 4:13 pm. On the last day of December, in Grand Isle, sunrise is at 7:30 am and sunset at 4:22 pm EST.

Sunshine

The average sunshine in December in Grand Isle, Vermont, is 3.7h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 1 in December interprets into the following recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
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Frequently asked questions

How cold is December in Grand Isle?

In December, the average high-temperature and low-temperature are 30.6°F (-0.8°C) and 20.7°F (-6.3°C) respectively.

What is the average humidity in December in Grand Isle?

In Grand Isle, the average relative humidity in December is 84%.

How much does it rain in Grand Isle in December?

In Grand Isle, Vermont, during December, the rain falls for 12.3 days and regularly aggregates up to 2.32" (59mm) of precipitation.

How many days does it snow in December in Grand Isle?

In Grand Isle, Vermont, in December, during 16.1 snowfall days, 6.34" (161mm) of snow is typically accumulated.

What is the month with the shortest days in Grand Isle?

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

What is the average length of the day in December in Grand Isle?

In Grand Isle, the average day length in December is 8h and 52min.

When is the sunrise / sunset in December in Grand Isle?

On the first day of December in Grand Isle, Vermont, sunrise is at 7:10 am and sunset at 4:13 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:22 pm EST.

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

In December, the average sunshine duration in Grand Isle, Vermont, is 3.7h.

When is the lowest UV index in Grand Isle?

With an average maximum UV index of 1, December is the month with the lowest UV index.

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

In December, the average daily maximum UV index is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
Grand Isle, VT

Average temperature in December - Grand Isle, VT
  • Average high temperature in December: 30.6°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in December: 20.7°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (12°F).

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Average pressure in December
Grand Isle, VT

Average pressure in December - Grand Isle, VT
  • Average pressure in December: 30.04"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Grand Isle, VT

Average wind speed in December - Grand Isle, VT
  • Average wind speed in December: 7.4mph

The windiest month (with the highest average wind speed) is April (8mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).

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Average humidity in December
Grand Isle, VT

Average humidity in December - Grand Isle, VT
  • Average humidity in December: 84%

The months with the highest relative humidity are January and February (87%).
The months with the lowest relative humidity are April and May (76%).

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Average rainfall in December
Grand Isle, VT

Average rainfall in December - Grand Isle, VT
  • Average rainfall in December: 2.32"

The wettest month (with the highest rainfall) is June (3.23").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in December
Grand Isle, VT

Average rainfall days in December - Grand Isle, VT
  • Average rainfall days in December: 12.3 days

The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is January (9.4 days).

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Average snowfall in December
Grand Isle, VT

Average snowfall in December - Grand Isle, VT
  • Average snowfall in December: 6.34"

The month with the highest snowfall is February (9.49").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Grand Isle, VT

Average snowfall days in December - Grand Isle, VT
  • Average snowfall days in December: 16.1 days

The month with the highest number of snowfall days is January (19.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Grand Isle, VT

Average daylight in December / Average sunshine in December - Grand Isle, VT
  • 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: 3h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).

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Average sunshine days in December
Grand Isle, VT

Average sunshine days in December - Grand Isle, VT
  • Average sunshine days in December: 8.3 days

The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (6.5 days).

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Average UV index in December
Grand Isle, VT

Average UV index in December - Grand Isle, VT
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in December
Grand Isle, VT

Average cloud cover in December - Grand Isle, VT
  • Average cloud cover in December: 63

The month with the most cloud cover is February (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in December
Grand Isle, VT

Average visibility in December - Grand Isle, VT
  • Average visibility in December: 5mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (4mi).

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Grand Isle, Vermont, USA

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