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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 -5°C (23°F), with a minimum dropping to -26°C (-15°F) and a maximum reaching 9°C (48°F). Expect 67 mm (2.6 in) of precipitation over approximately 10 days, and prepare for a high average humidity of 91%.

December Temperature in Superior

In December in Superior, the average temperature is -5°C (23°F), with maximums reaching up to 9°C (48°F) and minimums plunging as low as -26°C (-15°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable during their visit.

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 -5°C (23°F), with highs reaching up to 9°C (48°F) and lows dropping to around -26°C (-15°F).
JanFebMarAprMayJunJulAugSepOctNovDec141427354758666762483323
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 67 mm (2.6 in) over a period of 10 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 67 mm (2.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec253453749476961091191535267
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 91%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and pushing you to seek warmth at every opportunity.

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 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%89%85%76%71%70%71%73%82%88%91%
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 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Superior, you can visit Hourly UV Index in Superior.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234789987532
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-10°C (15°F)25 mm (1.0 inches)93%low
February Weather-10°C (14°F)33 mm (1.3 inches)93%moderate
March Weather-3°C (28°F)53 mm (2.1 inches)89%moderate
April Weather2°C (35°F)74 mm (2.9 inches)85%high
May Weather8°C (47°F)94 mm (3.7 inches)76%very high
June Weather15°C (59°F)76 mm (3.0 inches)71%very high
July Weather19°C (66°F)95 mm (3.8 inches)70%very high
August Weather19°C (67°F)109 mm (4.3 inches)71%very high
September Weather16°C (62°F)119 mm (4.7 inches)73%high
October Weather9°C (48°F)153 mm (6.0 inches)81%moderate
November Weather1°C (34°F)52 mm (2.0 inches)87%moderate
December Weather-5°C (23°F)67 mm (2.6 inches)91%low

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