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December Weather in Isle, United States

Last updated: June 24, 2025

In December, the average temperature in Isle, United States is a chilly -7°C (20°F). Expect minimums plunging to -28°C (-18°F) and maximums reaching up to 7°C (45°F). During this month, 56 mm (2.2 in) of precipitation typically falls over 8 days, with an average humidity of a brisk 89%.

December Temperature in Isle

In December in Isle, the average temperature is -7°C (20°F). Maximum temperatures can reach 7°C (45°F), while minimum temperatures can plummet to as low as -28°C (-18°F). Be sure to pack warm clothing if you plan to visit during this time!

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

The chart illustrates December temperature patterns in Isle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isle, December typically has an average temperature of -7°C (20°F), with highs reaching up to 7°C (45°F) and lows dropping to around -28°C (-18°F).
JanFebMarAprMayJunJulAugSepOctNovDec131328385568726961463020
Data source: Temperature data for Isle 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 Isle

In Isle in December, the precipitation amount is 56 mm (2.2 in) over the course of 8 days.

December Precipitation Trends in Isle

The chart displays monthly precipitation patterns in Isle, 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 Isle, December typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec2026467779851001141071303756
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Isle

In Isle in December humidity is 89%. With an average temperature of -7°C (20°F), this humidity feels like a biting chill that seeps into your bones, making travel quite uncomfortable as you navigate the frosty air that clings to every breath.

December Average Humidity in Isle

This chart illustrates the average monthly humidity levels in Isle, 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 Isle is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%93%88%83%76%76%76%77%77%82%88%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Isle

In Isle 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 Isle, you can visit Hourly UV Index in Isle.

Maximum UV Index Levels in Isle for December

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

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

This table compares monthly weather conditions in Isle, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)20 mm (0.8 inches)92%low
February Weather-11°C (13°F)26 mm (1.0 inches)93%moderate
March Weather-2°C (29°F)46 mm (1.8 inches)88%moderate
April Weather3°C (39°F)77 mm (3.0 inches)83%high
May Weather13°C (55°F)79 mm (3.1 inches)76%very high
June Weather20°C (68°F)85 mm (3.3 inches)76%very high
July Weather22°C (73°F)100 mm (3.9 inches)76%very high
August Weather20°C (69°F)114 mm (4.5 inches)77%very high
September Weather16°C (62°F)107 mm (4.2 inches)77%high
October Weather8°C (46°F)130 mm (5.1 inches)82%moderate
November Weather-1°C (30°F)37 mm (1.5 inches)87%moderate
December Weather-7°C (20°F)56 mm (2.2 inches)89%low

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