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December Weather in Forest Park, United States

Last updated: June 24, 2025

In December, the average temperature in Forest Park, United States hovers around 7°C (44°F). You might experience a minimum of -8°C (17°F) and enjoy occasional highs reaching 26°C (79°F). Expect about 36 mm (1.4 in) of precipitation spread over 4 days, and be prepared for a relatively high average humidity of 84%.

December Temperature in Forest Park

In December in Forest Park, the average temperature is 7°C (44°F), with maximums reaching up to 26°C (79°F) and minimums dropping as low as -8°C (17°F). This variation in temperature makes it essential to pack layers when traveling to Forest Park during this time.

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

The chart illustrates December temperature patterns in Forest Park, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Forest Park, December typically has an average temperature of 7°C (44°F), with highs reaching up to 26°C (79°F) and lows dropping to around -8°C (17°F).
JanFebMarAprMayJunJulAugSepOctNovDec394154596979838175625044
Data source: Temperature data for Forest 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 Forest Park

In Forest Park in December, the precipitation amount is 36 mm (1.4 in) over the course of 4 days.

December Precipitation Trends in Forest Park

The chart displays monthly precipitation patterns in Forest 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 Forest Park, December typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec474684124137966567851083036
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Forest Park

In Forest Park in December humidity is 84%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making it uncomfortable for traveling and requiring extra layers to stay warm and dry.

December Average Humidity in Forest Park

This chart illustrates the average monthly humidity levels in Forest 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 Forest Park is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%76%70%72%82%82%80%72%64%71%81%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Forest Park

In Forest Park in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Forest Park for better planning.

Maximum UV Index Levels in Forest Park for December

The chart shows the monthly maximum UV Index (UVI) for Forest 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 Forest Park typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111119754
Data source: Forest 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 Forest Park Compares to Other Months

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

This table compares monthly weather conditions in Forest Park, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)47 mm (1.8 inches)76%moderate
February Weather5°C (41°F)46 mm (1.8 inches)76%high
March Weather12°C (54°F)84 mm (3.3 inches)70%very high
April Weather15°C (59°F)124 mm (4.9 inches)72%very high
May Weather21°C (70°F)137 mm (5.4 inches)82%very high
June Weather26°C (79°F)96 mm (3.8 inches)82%extreme
July Weather28°C (83°F)65 mm (2.6 inches)80%extreme
August Weather27°C (81°F)67 mm (2.6 inches)72%extreme
September Weather24°C (76°F)85 mm (3.3 inches)64%very high
October Weather17°C (62°F)108 mm (4.3 inches)71%high
November Weather10°C (50°F)30 mm (1.2 inches)81%moderate
December Weather7°C (44°F)36 mm (1.4 inches)84%moderate

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