December weather forecastSuperior, WI
December
Weather in December
December in Superior welcomes the harsh yet beautiful winter, characterized by frigid temperatures and snowfall. Snow rules the weather scenario, with an impressive 0.98" (25mm) registered during the month, the most substantial of the year. The city gracefully transitions into a winter wonderland, with twinkling holiday lights offering a picturesque view. Outdoor enthusiasts eagerly await the arrival of the snow season as skiing and snowboarding opportunities make a strong comeback.Temperature
With the onset of December, Superior experiences a distinct temperature drop, with the average high-temperature reducing from November's cold 36.5°F (2.5°C) to a freezing cold 22.1°F (-5.5°C). In Superior, the expected average low-temperature for December is an extreme cold 12.2°F (-11°C).Humidity
In Superior, the average relative humidity in December is 89%.Rainfall
In Superior, during December, the rain falls for 2 days and regularly aggregates up to 0.39" (10mm) of precipitation. Throughout the year, there are 55.7 rainfall days, and 4.33" (110mm) of precipitation is accumulated.Snowfall
Months with snowfall in Superior are January through May, October through December. December is the month with the most snowfall. Snow falls for 9.3 days and accumulates 0.98" (25mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 7:33 am and sunset at 4:22 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:30 pm CST.
Sunshine
In Superior, the average sunshine in December is 3h.UV index
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 1 during December leads to these advisories:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. 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. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Superior, WI
- Average high temperature in December: 22.1°F
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (17.1°F).
- Average low temperature in December: 12.2°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (4.1°F).
Average pressure in December
Superior, WI
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Superior, WI
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in December
Superior, WI
- Average humidity in December: 89%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (72%).
Average rainfall in December
Superior, WI
- Average rainfall in December: 0.39"
The wettest month (with the highest rainfall) is July (0.67").
The driest months (with the least rainfall) are January and February (0.16").
Average rainfall days in December
Superior, WI
- Average rainfall days in December: 2 days
The month with the highest number of rainy days is May (7.9 days).
The month with the least rainy days is February (0.5 days).
Average snowfall in December
Superior, WI
- Average snowfall in December: 0.98"
The month with the highest snowfall is December (0.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Superior, WI
- Average snowfall days in December: 9.3 days
The months with the highest number of snowfall days are January and December (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Superior, WI
- 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: 3h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in December
Superior, WI
- Average sunshine days in December: 23.6 days
The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is April (19.9 days).
Average UV index in December
Superior, WI
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Superior, WI
- Average cloud cover in December: 70
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Superior, WI
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
