December weather forecastGrand Portage, MN
December
Weather in December
December is a full-blown winter month in Grand Portage with low temperatures and substantial snowfall up to 7.01" (178mm). The shorter daylight hours contribute to the cold environment. The sea temperature reaches its lower levels, dissuading any water-related engagements. An increase in wind speed accompanies the winter chills, adding to the frosty atmosphere. While the weather is harsh, December in Grand Portage displays its own quiet and serene beauty.Temperature
The onset of December comes with a shift in the average high-temperature, falling from a cold 34.2°F (1.2°C) in November to a subzero cold 21.6°F (-5.8°C). During December, Grand Portage observes a consistent average nighttime temperature of 12.6°F (-10.8°C).Humidity
In December, the average relative humidity in Grand Portage, Minnesota, is 88%.Rainfall
In Grand Portage, in December, during 5.4 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. Throughout the year, in Grand Portage, there are 115 rainfall days, and 18.19" (462mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Grand Portage, in December, 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 Grand Portage, in December, the average water temperature is 39.2°F (4°C).Note: In swimming exercises, this state is seen as life-threatening and poses serious dangers. The painful sensation of the cold water induces immediate hyperventilation. A specialized swimsuit is required to limit thermal damage.
Daylight
December has the shortest days of the year, with an average of 8h and 30min of daylight.On the first day of December, sunrise is at 7:28 am and sunset at 4:07 pm. On the last day of the month, sunrise is at 7:48 am and sunset at 4:15 pm CST.
Sunshine
In Grand Portage, Minnesota, 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 low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 1 during December translates into the following directions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. It's recommended to limit sun exposure when its radiation is at its peak during midday. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
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).
Average daylight in December /
Average sunshine in December
Grand Portage, MN
- Average daylight in December: 8h and 30min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in December: 3h and 12min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
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).
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).
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).
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).
