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December Weather in Marathon, United States

Last updated: June 24, 2025

In December, the average temperature in Marathon, United States hovers around -1°C (30°F). Expect the mercury to dip as low as -20°C (-4°F) and occasionally rise to a maximum of 16°C (61°F). With 102 mm (4.0 in) of precipitation spread across 14 days, you'll want to be prepared for damp conditions. The average humidity sits at a high 86%, creating a chilly and moist atmosphere throughout the month.

December Temperature in Marathon

In December in Marathon, the average temperature is -1°C (30°F). Maximum temperatures can reach 16°C (61°F), while minimum temperatures can drop as low as -20°C (-4°F). It's essential to pack appropriately for your travels, as you can experience a wide range of temperatures during this month.

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

The chart illustrates December temperature patterns in Marathon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marathon, December typically has an average temperature of -1°C (30°F), with highs reaching up to 16°C (61°F) and lows dropping to around -20°C (-4°F).
JanFebMarAprMayJunJulAugSepOctNovDec242733455765706862523729
Data source: Temperature data for Marathon 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 Marathon

In Marathon in December, the precipitation amount is 102 mm (4.0 in) over a period of 14 days.

December Precipitation Trends in Marathon

The chart displays monthly precipitation patterns in Marathon, 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 Marathon, December typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec899791123137107159120100154103102
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Marathon

In Marathon in December, humidity is 86%. With an average temperature of -1°C (30°F), this humidity feels like a heavy blanket wrapping around you, making traveling feel much colder and more uncomfortable than the temperature suggests.

December Average Humidity in Marathon

This chart illustrates the average monthly humidity levels in Marathon, 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 Marathon is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Marathon

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

Maximum UV Index Levels in Marathon for December

The chart shows the monthly maximum UV Index (UVI) for Marathon 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 Marathon typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
Data source: Marathon 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 Marathon Compares to Other Months

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

This table compares monthly weather conditions in Marathon, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)89 mm (3.5 inches)90%moderate
February Weather-3°C (27°F)97 mm (3.8 inches)90%moderate
March Weather1°C (33°F)91 mm (3.6 inches)87%high
April Weather7°C (45°F)123 mm (4.9 inches)88%very high
May Weather14°C (57°F)137 mm (5.4 inches)82%very high
June Weather18°C (66°F)107 mm (4.2 inches)79%very high
July Weather21°C (71°F)159 mm (6.3 inches)78%very high
August Weather20°C (69°F)120 mm (4.7 inches)76%very high
September Weather17°C (62°F)100 mm (3.9 inches)78%very high
October Weather11°C (52°F)154 mm (6.1 inches)84%high
November Weather3°C (37°F)103 mm (4.0 inches)89%moderate
December Weather-1°C (30°F)102 mm (4.0 inches)86%low

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