Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December weather is marked by a drop in the average high-temperature, falling from a cold 40.3°F (4.6°C) in November to a freezing cold 30.2°F (-1°C). Mackinac Island's December nights witness minimal differential from the daytime temperatures, with averages of 23°F (-5°C).Humidity
The average relative humidity in December is 85%.Rainfall
In Mackinac Island, during December, the rain falls for 9.2 days and regularly aggregates up to 1.73" (44mm) of precipitation. Throughout the year, in Mackinac Island, there are 131 rainfall days, and 21.22" (539mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Mackinac Island, in December, during 19.2 snowfall days, 5.59" (142mm) of snow is typically accumulated. In Mackinac Island, during the entire year, snow falls for 93.6 days and aggregates up to 27.91" (709mm) of snow.Ocean temperature
In December, the average ocean temperature is 39.2°F (4°C).Note: While swimming, this scenario is perilously cold, dangerous, and potentially fatal. Hypothermia is almost imminent without proper insulated waterproof attire.
Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 8:00 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 in Mackinac Island is 2.3h.UV index
The months with the lowest UV index in Mackinac Island, Michigan, 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 vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average UV index of 1 in December transforms into this advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. It's recommended to limit sun exposure when its radiation is at its peak during midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Mackinac Island in December?
What is the average humidity in December in Mackinac Island?
How much does it rain in Mackinac Island in December?
How much does it snow in Mackinac Island in December?
How cold is the water in December in Mackinac Island?
What is the month with the shortest days in Mackinac Island?
How many hours of daylight does Mackinac Island have in December?
When are sunrise and sunset in December in Mackinac Island?
How many hours of sunshine does Mackinac Island have in December?
When is the lowest UV index in Mackinac Island?
How high is the UV index in December in Mackinac Island?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
Average daylight in December /
Average sunshine in December
Mackinac Island, MI
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 2h and 2min
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).
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).
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).
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).
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).
Mackinac Island, Michigan, USA
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