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January Weather in Forest Park, United States

Last updated: June 24, 2025

In January, the average temperature in Forest Park, United States hovers around 4°C (39°F). Be prepared for a temperature range that can dip as low as -16°C (4°F) and soar to a maximum of 24°C (76°F). Expect about 47 mm (1.8 in) of precipitation spread over 5 days, with an average humidity level of 76%.

January Temperature in Forest Park

In January in Forest Park, the average temperature is 4°C (39°F). The maximum can reach 24°C (76°F), and the minimum can be as low as -16°C (4°F). This wide temperature range suggests that travelers should pack layers to be prepared for varying weather conditions.

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

The chart illustrates January 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, January typically has an average temperature of 4°C (39°F), with highs reaching up to 24°C (76°F) and lows dropping to around -16°C (4°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.

January Precipitation in Forest Park

In Forest Park in January, the total precipitation amount is 47 mm (1.8 in) over the course of 5 days.

January Precipitation Trends in Forest Park

The chart displays monthly precipitation patterns in Forest Park, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Forest Park, January typically receives around 47 mm (1.8 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec474684124137966567851083036
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Forest Park

In Forest Park in January humidity is 76%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making it quite uncomfortable for traveling.

January Average Humidity in Forest Park

This chart illustrates the average monthly humidity levels in Forest Park, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Forest Park is approximately 76%, 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 January generated using information from the Copernicus Climate Change Service.

January UV Index in Forest Park

In Forest Park in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Forest Park in January, 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 January, the maximum UV index in Forest Park typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111119754
Data source: Forest Park January 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 January 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 January’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 January’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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