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December Weather in Rantoul, United States

Last updated: June 24, 2025

In December, the average temperature in Rantoul, United States rests at a chilly 2°C (35°F). Expect a range from a frosty -21°C (-5°F) to a mild 19°C (66°F). With about 53 mm (2.1 in) of precipitation over 8 days, the air is often humid, averaging 84%. Prepare for a mix of conditions as you explore!

December Temperature in Rantoul

In December in Rantoul, the average temperature is 2°C (35°F), with maximums reaching up to 19°C (66°F) and minimums plunging to as low as -21°C (-5°F). Be prepared for a wide range of temperatures, making layered clothing essential for your travels.

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

The chart illustrates December temperature patterns in Rantoul, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rantoul, December typically has an average temperature of 2°C (35°F), with highs reaching up to 19°C (66°F) and lows dropping to around -21°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec283042526474777470574135
Data source: Temperature data for Rantoul 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 Rantoul

In Rantoul in December, the total precipitation amount is 53 mm (2.1 in) over the course of 8 days.

December Precipitation Trends in Rantoul

The chart displays monthly precipitation patterns in Rantoul, 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 Rantoul, December typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec757411612514511080103801207253
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rantoul

In Rantoul in December, humidity is 84%. With an average temperature of 2°C (35°F), this humidity feels like an uncomfortable chill that penetrates your bones, making outdoor travel quite brisk and uninviting.

December Average Humidity in Rantoul

This chart illustrates the average monthly humidity levels in Rantoul, 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 Rantoul is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rantoul

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

Maximum UV Index Levels in Rantoul for December

The chart shows the monthly maximum UV Index (UVI) for Rantoul 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 Rantoul typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Rantoul 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 Rantoul Compares to Other Months

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

This table compares monthly weather conditions in Rantoul, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)75 mm (2.9 inches)82%moderate
February Weather-1°C (31°F)74 mm (2.9 inches)83%moderate
March Weather6°C (42°F)116 mm (4.6 inches)84%high
April Weather11°C (52°F)124 mm (4.9 inches)85%very high
May Weather18°C (65°F)145 mm (5.7 inches)79%very high
June Weather23°C (74°F)110 mm (4.3 inches)82%extreme
July Weather25°C (77°F)80 mm (3.1 inches)80%very high
August Weather23°C (74°F)103 mm (4.0 inches)81%very high
September Weather21°C (70°F)80 mm (3.2 inches)80%very high
October Weather14°C (57°F)120 mm (4.7 inches)82%high
November Weather5°C (41°F)72 mm (2.8 inches)88%moderate
December Weather2°C (35°F)53 mm (2.1 inches)84%low

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