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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 9°C (49°F). Expect a chill in the air, with minimums dipping to -5°C (22°F) and maximums reaching a pleasant 24°C (76°F). Be prepared for 133 mm (5.2 in) of precipitation spread across approximately 11 days, contributing to an average humidity of 89%. Perfect for cozy indoor activities or bundling up for an adventurous day out!

December Temperature in Forest Park

In December in Forest Park, the average temperature is 9°C (49°F), with maximums reaching 24°C (76°F) and minimums dropping as low as -5°C (22°F). Travelers should be prepared for a wide range of weather conditions during this month.

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 9°C (49°F), with highs reaching up to 24°C (76°F) and lows dropping to around -5°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec465257637177807975665349
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 133 mm (5.2 in) spread over a period of 11 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 133 mm (5.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec1011331131159311610314010911079133
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 89%. With an average temperature of 9°C (49°F), this humidity feels like a persistent dampness that clings to your clothes and skin, making it challenging to stay comfortable while traveling.

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 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%81%81%81%83%81%82%78%86%89%
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.
JanFebMarAprMayJunJulAugSepOctNovDec47811111111109864
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 Weather8°C (46°F)101 mm (4.0 inches)86%moderate
February Weather11°C (52°F)133 mm (5.2 inches)84%high
March Weather14°C (57°F)113 mm (4.5 inches)83%very high
April Weather17°C (63°F)115 mm (4.5 inches)81%extreme
May Weather22°C (72°F)93 mm (3.7 inches)81%extreme
June Weather25°C (77°F)116 mm (4.6 inches)81%extreme
July Weather27°C (80°F)103 mm (4.1 inches)83%extreme
August Weather26°C (79°F)140 mm (5.5 inches)81%very high
September Weather24°C (76°F)109 mm (4.3 inches)82%very high
October Weather19°C (67°F)110 mm (4.3 inches)78%very high
November Weather12°C (53°F)79 mm (3.1 inches)86%high
December Weather9°C (49°F)133 mm (5.2 inches)89%moderate

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