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December Weather in Superior, United States

Last updated: June 24, 2025

The average temperature in Superior, United States during December hovers around -3°C (27°F). However, be prepared for a wide range, as temperatures can dip to a chilling -22°C (-8°F) and rise as high as 14°C (58°F). Rain is a frequent visitor, with 92 mm (3.6 in) of precipitation expected over 16 days. Moreover, the air tends to be quite humid, averaging around 90%.

December Temperature in Superior

In December in Superior, the average temperature is -3°C (27°F), with maximums reaching 14°C (58°F) and minimums dropping as low as -22°C (-8°F). This range of temperatures means travelers should be well-prepared for chilly conditions and varying temperatures.

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 -3°C (27°F), with highs reaching up to 14°C (58°F) and lows dropping to around -22°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec252332394958676655413327
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 reaches 92 mm (3.6 in) spread over 16 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 92 mm (3.6 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec7111775888465202941859592
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 90%. With an average temperature of -3°C (27°F), this humidity feels like a bitter chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to combat both the cold and the dampness in the air.

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 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
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.
JanFebMarAprMayJunJulAugSepOctNovDec246710101097532
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-4°C (26°F)71 mm (2.8 inches)89%low
February Weather-5°C (23°F)117 mm (4.6 inches)89%moderate
March Weather0°C (33°F)75 mm (2.9 inches)87%high
April Weather4°C (39°F)87 mm (3.4 inches)84%high
May Weather10°C (50°F)84 mm (3.3 inches)77%very high
June Weather14°C (58°F)65 mm (2.6 inches)78%very high
July Weather19°C (67°F)20 mm (0.8 inches)77%very high
August Weather19°C (66°F)29 mm (1.1 inches)64%very high
September Weather13°C (55°F)41 mm (1.6 inches)62%high
October Weather5°C (41°F)85 mm (3.4 inches)79%moderate
November Weather1°C (33°F)95 mm (3.7 inches)87%moderate
December Weather-3°C (27°F)92 mm (3.6 inches)90%low

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