December weather forecast
Mackinac Island, MI

A tranquil neighborhood with homes and a church in a scenic natural park in Mackinac Island, Michigan
A tranquil neighborhood with homes and a church in a scenic natural park in Mackinac Island, Michigan

Weather in December

December, the first month of the winter in Mackinac Island, is also a subzero cold month, with temperature in the range of an average low of 23°F (-5°C) and an average high of 30.2°F (-1°C).

Temperature

In December, the average high-temperature decreases from a cold 40.3°F (4.6°C) in November to a freezing cold 30.2°F (-1°C). The average low-temperature, in December, is 23°F (-5°C).

Humidity

In December, the average relative humidity in Mackinac Island is 85%.

Rainfall

In Mackinac Island, it is raining for 9.2 days, with typically 1.73" (44mm) of accumulated precipitation. In Mackinac Island, during the entire year, the rain falls for 131 days and collects up to 21.22" (539mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Mackinac Island. In Mackinac Island, during 19.2 snowfall days, 5.59" (142mm) of snow is typically accumulated. Throughout the year, in Mackinac Island, there are 93.6 snowfall days, and 27.91" (709mm) of snow is accumulated.

Ocean temperature

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

Daylight

With an average of 8h and 44min of daylight, December has the shortest days of the year in Mackinac Island, Michigan.
On the first day of December, sunrise is at 7:59 am and sunset at 4:55 pm. On the last day of the month, sunrise is at 8:19 am and sunset at 5:03 pm EST.

Sunshine

In December, the average sunshine is 2.3h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation 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. 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. 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 Mackinac Island?

In Mackinac Island, in December, the average high-temperature is 30.2°F (-1°C), and the average low-temperature is 23°F (-5°C).

What is the average humidity in December in Mackinac Island?

In December, the average relative humidity is 85%.

How much does it rain in Mackinac Island in December?

In Mackinac Island, during December, the rain falls for 9.2 days and regularly aggregates up to 1.73" (44mm) of precipitation.

How many days does it snow in December in Mackinac Island?

In Mackinac Island, Michigan, in December, snow falls for 19.2 days, with typically accumulated 5.59" (142mm) of snow.

What is the water temperature in December in Mackinac Island?

In Mackinac Island, the average seawater temperature in December 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 Mackinac Island?

With an average of 8h and 44min of daylight, December has the shortest days of the year in Mackinac Island, Michigan.

What is the average length of the day in December in Mackinac Island?

In Mackinac Island, the average day length in December is 8h and 44min.

When are sunrise and sunset in December in Mackinac Island?

In December, on the first day of the month, sunrise is at 7:59 am and sunset at 4:55 pm. On the last day of the month, sunrise is at 8:19 am and sunset at 5:03 pm EST.

How many hours of sunshine does Mackinac Island have in December?

In Mackinac Island, the average sunshine duration in December is 2.3h.

What is the month with the lowest UV index in Mackinac Island?

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

How high is the UV index in December in Mackinac Island?

In December, the average daily maximum UV index in Mackinac Island, Michigan, is 1. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
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
Mackinac Island, MI

Average temperature in December - Mackinac Island, MI
  • Average high temperature in December: 30.2°F

The warmest month (with the highest average high temperature) is July (71.4°F).
The month with the lowest average high temperature is January (23.4°F).

  • Average low temperature in December: 23°F

The month with the highest average low temperature is August (58.6°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).

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Average pressure in December
Mackinac Island, MI

Average pressure in December - Mackinac Island, MI
  • Average pressure in December: 30.02"Hg

The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
Mackinac Island, MI

Average wind speed in December - Mackinac Island, MI
  • Average wind speed in December: 10.9mph

The windiest months (with the highest average wind speed) are November and December (10.9mph).
The calmest months (with the lowest average wind speed) are June and July (7.6mph).

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Average humidity in December
Mackinac Island, MI

Average humidity in December - Mackinac Island, MI
  • Average humidity in December: 85%

The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (75%).

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Average rainfall in December
Mackinac Island, MI

Average rainfall in December - Mackinac Island, MI
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is October (2.72").
The driest month (with the least rainfall) is January (1.3").

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Average rainfall days in December
Mackinac Island, MI

Average rainfall days in December - Mackinac Island, MI
  • Average rainfall days in December: 9.2 days

The month with the highest number of rainy days is October (16.5 days).
The month with the least rainy days is February (5.3 days).

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Average snowfall in December
Mackinac Island, MI

Average snowfall in December - Mackinac Island, MI
  • Average snowfall in December: 5.59"

The month with the highest snowfall is January (5.91").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Mackinac Island, MI

Average snowfall days in December - Mackinac Island, MI
  • Average snowfall days in December: 19.2 days

The month with the highest number of snowfall days is January (21.9 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
Mackinac Island, MI

Average sea temperature in December - Mackinac Island, MI
  • Average sea temperature in December: 39°F

The best month for swimming (with the highest average sea temperature) is August (61°F).
The coldest months (with the lowest average sea temperature) are February, March and April (36°F).

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Average daylight in December /
Average sunshine in December
Mackinac Island, MI

Average daylight in December / Average sunshine in December - Mackinac Island, MI
  • Average daylight in December: 8h and 44min

The month with the longest days is June (Average daylight: 15h and 40min).
The month with the shortest days is December (Average daylight: 8h and 44min).

  • Average sunshine in December: 2h and 18min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 1h and 54min).

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Average sunshine days in December
Mackinac Island, MI

Average sunshine days in December - Mackinac Island, MI
  • Average sunshine days in December: 7.6 days

The month with the most sunshine days is September (16.9 days).
The month with the least sunshine days is January (7.1 days).

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Average UV index in December
Mackinac Island, MI

Average UV index in December - Mackinac Island, MI
  • Average UV index in December: 1

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 1).

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Average cloud cover in December
Mackinac Island, MI

Average cloud cover in December - Mackinac Island, MI
  • Average cloud cover in December: 75

The month with the most cloud cover is January (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 32).

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Average visibility in December
Mackinac Island, MI

Average visibility in December - Mackinac Island, MI
  • Average visibility in December: 5mi

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

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