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December Weather in Superior, United States

Last updated: June 24, 2025

In December, the average temperature in Superior, United States hovers around 10°C (50°F). Expect a minimum chill of -4°C (25°F) and a pleasant maximum of 25°C (77°F). Prepare for about 45 mm (1.8 in) of precipitation spread over 5 days, and keep in mind the average humidity sits at a high 82%.

December Temperature in Superior

In December in Superior, the average temperature is 10°C (50°F). Maximums can reach 25°C (77°F), while minimums can drop as low as -4°C (25°F). Be prepared for a wide range of temperatures when traveling during this time of year.

December Weather in Superior: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Superior, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Superior, December typically has an average temperature of 10°C (50°F), with highs reaching up to 25°C (77°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec485057677485868580685950
Data source: Temperature data for Superior generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Superior

In Superior in December, the total precipitation amount is 45 mm (1.8 in) over a span of 5 days.

December Precipitation Trends in Superior

The chart displays monthly precipitation patterns in Superior, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Superior, December typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec596641485895744292945
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Superior

In Superior in December, humidity is 82%. With an average temperature of 10°C (50°F), this humidity feels like a dense, heavy blanket wrapping around you, making every step feel sluggish and the air thick, which can make traveling quite uncomfortable.

December Average Humidity in Superior

This chart illustrates the average monthly humidity levels in Superior, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Superior is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Superior

In Superior in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Superior for better planning.

Maximum UV Index Levels in Superior for December

The chart shows the monthly maximum UV Index (UVI) for Superior in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Superior typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469111212121110864
Data source: Superior December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Superior Compares to Other Months

Weather in Superior varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Superior, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Superior, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)59 mm (2.3 inches)76%moderate
February Weather10°C (51°F)66 mm (2.6 inches)79%high
March Weather14°C (57°F)41 mm (1.6 inches)67%very high
April Weather19°C (67°F)4 mm (0.2 inches)55%extreme
May Weather23°C (74°F)8 mm (0.3 inches)40%extreme
June Weather29°C (85°F)5 mm (0.2 inches)33%extreme
July Weather30°C (86°F)89 mm (3.5 inches)34%extreme
August Weather29°C (85°F)57 mm (2.2 inches)48%extreme
September Weather27°C (80°F)44 mm (1.7 inches)64%very high
October Weather20°C (69°F)29 mm (1.2 inches)67%very high
November Weather15°C (60°F)29 mm (1.1 inches)77%high
December Weather10°C (50°F)45 mm (1.8 inches)82%moderate

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