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December Weather in South Park, United States

Last updated: June 24, 2025

In December, the average temperature in South Park, United States hovers around -8°C (18°F), with extremes that can plunge to a chilling -22°C (-7°F) and rise to a mild 7°C (45°F). Travelers should prepare for 83 mm (3.3 in) of precipitation over approximately 15 days, contributing to an average humidity of 91%.

December Temperature in South Park

In December in South Park, the average temperature is -8°C (18°F). Maximum temperatures can reach 7°C (45°F), while minimums can drop as low as -22°C (-7°F). Travelers should be prepared for cold weather and dress accordingly to fully enjoy their visit to South Park.

December Weather in South Park: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in South Park, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Park, December typically has an average temperature of -8°C (18°F), with highs reaching up to 7°C (45°F) and lows dropping to around -22°C (-7°F).
JanFebMarAprMayJunJulAugSepOctNovDec181928323952626050342418
Data source: Temperature data for South Park 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 South Park

In South Park in December, the precipitation amount is 83 mm (3.3 in) spread over 15 days.

December Precipitation Trends in South Park

The chart displays monthly precipitation patterns in South Park, 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 South Park, December typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec82132761036766283558709183
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in South Park

In South Park in December humidity is 91%. With an average temperature of -8°C (18°F), this humidity feels like an icy blanket that clings to your skin, making every step feel heavier as you navigate the frigid air while wrapped in layers, leaving you longing for warmth.

December Average Humidity in South Park

This chart illustrates the average monthly humidity levels in South Park, 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 South Park is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%95%90%81%71%64%59%49%52%69%86%91%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in South Park

In South Park 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 South Park, you can visit Hourly UV Index in South Park.

Maximum UV Index Levels in South Park for December

The chart shows the monthly maximum UV Index (UVI) for South Park 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 South Park typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35710111211119642
Data source: South Park 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 South Park Compares to Other Months

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

This table compares monthly weather conditions in South Park, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)82 mm (3.2 inches)95%moderate
February Weather-7°C (19°F)132 mm (5.2 inches)95%moderate
March Weather-2°C (28°F)76 mm (3.0 inches)90%high
April Weather0°C (33°F)103 mm (4.0 inches)81%very high
May Weather4°C (39°F)67 mm (2.6 inches)71%extreme
June Weather11°C (53°F)66 mm (2.6 inches)64%extreme
July Weather17°C (62°F)28 mm (1.1 inches)59%extreme
August Weather15°C (60°F)35 mm (1.4 inches)49%extreme
September Weather10°C (51°F)58 mm (2.3 inches)52%very high
October Weather1°C (34°F)70 mm (2.7 inches)69%high
November Weather-4°C (24°F)91 mm (3.6 inches)86%moderate
December Weather-8°C (18°F)83 mm (3.3 inches)91%low

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