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December Weather in Iron River, United States

Last updated: June 24, 2025

In December, the average temperature in Iron River, United States hovers around -6°C (21°F), with a chilling minimum plunging to -29°C (-21°F) and a maximum reaching a mild 15°C (59°F). Expect about 66 mm (2.6 in) of precipitation spread over 10 days, and brace yourself for high humidity, averaging a damp 91%.

December Temperature in Iron River

In December in Iron River, the average temperature is -6°C (21°F). The maximum can reach 15°C (59°F), while the minimum can dip as low as -29°C (-21°F). Travelers should prepare for a wide range of temperatures and dress in layers to stay comfortable during their visit.

December Weather in Iron River: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Iron River, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iron River, December typically has an average temperature of -6°C (21°F), with highs reaching up to 15°C (59°F) and lows dropping to around -29°C (-21°F).
JanFebMarAprMayJunJulAugSepOctNovDec141428395466706760453020
Data source: Temperature data for Iron River 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 Iron River

In Iron River in December, the precipitation amount is 66 mm (2.6 in) over the course of 10 days.

December Precipitation Trends in Iron River

The chart displays monthly precipitation patterns in Iron River, 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 Iron River, December typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec283846849892111101991024966
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Iron River

In Iron River in December humidity is 91%. With an average temperature of -6°C (21°F), this humidity feels like wandering through a cold, damp fog that clings to your skin, making it challenging to stay warm and comfortable while exploring the surroundings.

December Average Humidity in Iron River

This chart illustrates the average monthly humidity levels in Iron River, 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 Iron River 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 Iron River

In Iron River 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 Iron River, you can visit Hourly UV Index in Iron River.

Maximum UV Index Levels in Iron River for December

The chart shows the monthly maximum UV Index (UVI) for Iron River 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 Iron River typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457810987532
Data source: Iron River 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 Iron River Compares to Other Months

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

This table compares monthly weather conditions in Iron River, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (14°F)28 mm (1.1 inches)93%low
February Weather-10°C (14°F)38 mm (1.5 inches)93%moderate
March Weather-2°C (29°F)46 mm (1.8 inches)89%moderate
April Weather4°C (39°F)84 mm (3.3 inches)85%high
May Weather12°C (55°F)98 mm (3.8 inches)76%very high
June Weather19°C (66°F)92 mm (3.6 inches)71%very high
July Weather21°C (70°F)111 mm (4.4 inches)70%very high
August Weather19°C (67°F)101 mm (4.0 inches)71%very high
September Weather15°C (60°F)99 mm (3.9 inches)73%high
October Weather7°C (45°F)102 mm (4.0 inches)81%moderate
November Weather-1°C (30°F)49 mm (1.9 inches)87%moderate
December Weather-6°C (21°F)66 mm (2.6 inches)91%low

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