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December Weather in Superior, United States

Last updated: June 24, 2025

In Superior, United States, the average temperature in December hovers around 1°C (34°F), with potential fluctuations ranging from a frigid -18°C (0°F) to a balmy 23°C (73°F). Expect about 39 mm (1.5 in) of precipitation spread over 3 days, contributing to an average humidity level of 83%.

December Temperature in Superior

In December in Superior, the average temperature is 1°C (34°F). The maximum can reach 23°C (73°F), while the minimum can be as low as -18°C (0°F). This wide temperature range suggests that travelers should prepare for both mild days and potentially cold nights.

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 1°C (34°F), with highs reaching up to 23°C (73°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec282843526377807671544234
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 precipitation amount is 39 mm (1.5 in) over a span of 3 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 39 mm (1.5 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec2722814517580708468892239
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 83%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making travel uncomfortable as the damp cold seeps into your bones, adding an extra layer of heaviness to the air that can leave you feeling sluggish and fatigued.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%78%67%70%82%81%80%80%74%71%79%83%
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 is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Superior, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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 Weather-2°C (29°F)27 mm (1.1 inches)74%moderate
February Weather-2°C (29°F)22 mm (0.9 inches)78%moderate
March Weather6°C (43°F)81 mm (3.2 inches)67%high
April Weather11°C (52°F)45 mm (1.8 inches)70%very high
May Weather17°C (63°F)175 mm (6.9 inches)82%very high
June Weather25°C (77°F)80 mm (3.1 inches)81%extreme
July Weather26°C (80°F)70 mm (2.8 inches)80%extreme
August Weather24°C (76°F)84 mm (3.3 inches)80%very high
September Weather22°C (71°F)68 mm (2.7 inches)73%very high
October Weather12°C (54°F)89 mm (3.5 inches)71%high
November Weather6°C (42°F)22 mm (0.9 inches)79%moderate
December Weather1°C (34°F)39 mm (1.5 inches)83%moderate

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