December weather forecastGrand Marais, MI
December
Weather in December
December is a time of peak winter conditions in Grand Marais, with short daylight hours and limited sunshine. The high wind speeds contribute to the winter's harshness. Furthermore, the high humidity due to cold temperatures coupled with increased rainfall heightens the wintry feel. The parameters peak at this month with the second highest snowfall of the year, reaching 9.37" (238mm), and temperatures fluctuating from 21°F (-6.1°C) to 28.8°F (-1.8°C). Despite its severe weather conditions, December maintains a unique charm, with enchanting snow landscapes and holiday festivities enriching the atmosphere.Temperature
Onset of December comes with a temperature decline, the average high falling from an icy 39.2°F (4°C) in November to a subzero cold 28.8°F (-1.8°C). Consistently, Grand Marais reports average nighttime temperatures of 21°F (-6.1°C) during December, a marginal step down from its daytime highs.Humidity
In December, the average relative humidity in Grand Marais, Michigan, is 88%.Rainfall
In Grand Marais, in December, it is raining for 7.5 days, with typically 1.81" (46mm) of accumulated precipitation. In Grand Marais, Michigan, during the entire year, the rain falls for 123.2 days and collects up to 22.17" (563mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Grand Marais, Michigan. In December, in Grand Marais, it is snowing for 20.4 days. Throughout December, 9.37" (238mm) of snow is accumulated. Throughout the year, in Grand Marais, there are 108.1 snowfall days, and 48.31" (1227mm) of snow is accumulated.Ocean temperature
In Grand Marais, Michigan, the average seawater temperature in December is 39.2°F (4°C).Note: In relation to swimming, the extreme cold, danger, and potential fatality of this situation are apparent. Without suitable insulated waterproof clothing, the onset of hypothermia is quick.
Daylight
December has the shortest days of the year in Grand Marais, Michigan, with an average of 8h and 36min of daylight.On the first day of December in Grand Marais, Michigan, sunrise is at 8:08 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 8:28 am and sunset at 5:06 pm EST.
Sunshine
In Grand Marais, the average sunshine in December is 2.1h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: The average daily UV index of 1 in December transforms into the following instructions:
Those with sensitive skin, infants, and children require constant safeguarding 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. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Grand Marais, MI
- Average high temperature in December: 28.8°F
The warmest month (with the highest average high temperature) is July (72.1°F).
The month with the lowest average high temperature is January (22.8°F).
- Average low temperature in December: 21°F
The month with the highest average low temperature is August (56.8°F).
The coldest month (with the lowest average low temperature) is February (13.6°F).
Average pressure in December
Grand Marais, 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
Grand Marais, MI
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is November (10.1mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in December
Grand Marais, MI
- Average humidity in December: 88%
The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is May (73%).
Average rainfall in December
Grand Marais, MI
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is October (2.8").
The driest month (with the least rainfall) is March (1.5").
Average rainfall days in December
Grand Marais, MI
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is October (15.3 days).
The month with the least rainy days is February (3.1 days).
Average snowfall in December
Grand Marais, MI
- Average snowfall in December: 9.37"
The month with the highest snowfall is January (10.08").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grand Marais, MI
- Average snowfall days in December: 20.4 days
The month with the highest number of snowfall days is January (24.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Grand Marais, MI
- 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 March and April (36°F).
Average daylight in December /
Average sunshine in December
Grand Marais, MI
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 2h and 6min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 1h and 36min).
Average sunshine days in December
Grand Marais, MI
- Average sunshine days in December: 7.6 days
The month with the most sunshine days is June (16.3 days).
The month with the least sunshine days is January (5.8 days).
Average UV index in December
Grand Marais, 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, November and December (UV index 1).
Average cloud cover in December
Grand Marais, MI
- Average cloud cover in December: 77
The month with the most cloud cover is January (Cloud cover 83).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Grand Marais, 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 and February (4mi).
