December weather forecast
Grand Portage, MN

Weather in December

December, the first month of the winter in Grand Portage, is still a freezing cold month, with an average temperature varying between 21.6°F (-5.8°C) and 12.6°F (-10.8°C).

Temperature

In Grand Portage, the average high-temperature in December decreases from a wintry 34.2°F (1.2°C) in November to a freezing cold 21.6°F (-5.8°C). In December, the average low-temperature is 12.6°F (-10.8°C).

Humidity

The average relative humidity in December in Grand Portage is 88%.

Rainfall

In Grand Portage, during December, the rain falls for 5.4 days and regularly aggregates up to 1.38" (35mm) of precipitation. In Grand Portage, during the entire year, the rain falls for 115 days and collects up to 18.19" (462mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Grand Portage. In Grand Portage, during 19.6 snowfall days, 7.01" (178mm) of snow is typically accumulated. Throughout the year, in Grand Portage, there are 104.1 snowfall days, and 39.84" (1012mm) of snow is accumulated.

Ocean temperature

In December, the average ocean temperature in Grand Portage, Minnesota, is 39.2°F (4°C).
Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

Daylight

December has the shortest days of the year in Grand Portage, with an average of 8h and 28min of daylight.
On the first day of the month, sunrise is at 7:27 am and sunset at 4:08 pm. On the last day of December, sunrise is at 7:48 am and sunset at 4:15 pm CST.

Sunshine

In Grand Portage, the average sunshine in December is 3.2h.

UV index

The months with the lowest UV index in Grand Portage are January through March, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Grand Portage?

In December, the average relative humidity is 88%.

How many days does it rain in December in Grand Portage?

In Grand Portage, Minnesota, in December, it is raining for 5.4 days, with typically 1.38" (35mm) of accumulated precipitation.

How much does it snow in Grand Portage in December?

In Grand Portage, Minnesota, in December, snow falls for 19.6 days, with typically accumulated 7.01" (178mm) of snow.

How cold is the water in December in Grand Portage?

In December, the average ocean temperature in Grand Portage is 39.2°F (4°C). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

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

The month with the shortest days in Grand Portage, Minnesota, is December, with an average of 8h and 28min of daylight.

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

The average day length in December in Grand Portage, Minnesota, is 8h and 28min.

What time are sunrise and sunset in December in Grand Portage?

In December, on the first day of the month, sunrise is at 7:27 am and sunset at 4:08 pm. On the last day of the month, in Grand Portage, sunrise is at 7:48 am and sunset at 4:15 pm CST.

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

The average sunshine duration in December is 3.2h.

What are the months with the lowest UV index in Grand Portage?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1.

What is the UV index intensity in December in Grand Portage?

In December, the average daily maximum UV index in Grand Portage is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in December
Grand Portage, MN

Average temperature in December - Grand Portage, MN
  • Average high temperature in December: 21.6°F

The warmest months (with the highest average high temperature) are July and August (70°F).
The month with the lowest average high temperature is January (16.2°F).

  • Average low temperature in December: 12.6°F

The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is January (3.7°F).

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Average pressure in December
Grand Portage, MN

Average pressure in December - Grand Portage, MN
  • Average pressure in December: 30.05"Hg

The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in December
Grand Portage, MN

Average wind speed in December - Grand Portage, MN
  • Average wind speed in December: 9.2mph

The windiest month (with the highest average wind speed) is December (9.2mph).
The calmest month (with the lowest average wind speed) is June (6.2mph).

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Average humidity in December
Grand Portage, MN

Average humidity in December - Grand Portage, MN
  • Average humidity in December: 88%

The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (70%).

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Average rainfall in December
Grand Portage, MN

Average rainfall in December - Grand Portage, MN
  • Average rainfall in December: 1.38"

The wettest months (with the highest rainfall) are May and October (1.77").
The driest months (with the least rainfall) are January and February (1.06").

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Average rainfall days in December
Grand Portage, MN

Average rainfall days in December - Grand Portage, MN
  • Average rainfall days in December: 5.4 days

The month with the highest number of rainy days is July (12.9 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall in December
Grand Portage, MN

Average snowfall in December - Grand Portage, MN
  • Average snowfall in December: 7.01"

The month with the highest snowfall is January (7.76").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Grand Portage, MN

Average snowfall days in December - Grand Portage, MN
  • Average snowfall days in December: 19.6 days

The month with the highest number of snowfall days is January (21.6 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
Grand Portage, MN

Average sea temperature in December - Grand Portage, MN
  • Average sea temperature in December: 39°F

The best month for swimming (with the highest average sea temperature) is August (59°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).

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Average daylight in December /
Average sunshine in December
Grand Portage, MN

Average daylight in December / Average sunshine in December - Grand Portage, MN
  • Average daylight in December: 8h and 28min

The month with the longest days is June (Average daylight: 15h and 58min).
The month with the shortest days is December (Average daylight: 8h and 28min).

  • Average sunshine in December: 3.2h

The month with the most sunshine is June (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 3h).

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Average sunshine days in December
Grand Portage, MN

Average sunshine days in December - Grand Portage, MN
  • Average sunshine days in December: 10.5 days

The month with the most sunshine days is September (18.1 days).
The month with the least sunshine days is March (9.8 days).

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Average UV index in December
Grand Portage, MN

Average UV index in December - Grand Portage, MN
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).

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Average cloud cover in December
Grand Portage, MN

Average cloud cover in December - Grand Portage, MN
  • Average cloud cover in December: 68

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 33).

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Average visibility in December
Grand Portage, MN

Average visibility in December - Grand Portage, MN
  • Average visibility in December: 5mi

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

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