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December Weather in Glen Carbon, United States

Last updated: June 24, 2025

In December, the average temperature in Glen Carbon, United States hovers around 4°C (39°F). However, be prepared for a wide range, as temperatures can dip to a chilling -18°C (-1°F) and soar up to a pleasant 21°C (71°F). Expect about 62 mm (2.4 in) of precipitation over approximately 7 days, accompanied by high humidity levels averaging 86%.

December Temperature in Glen Carbon

In December in Glen Carbon, the average temperature is 4°C (39°F). The maximum can reach 21°C (71°F), and the minimum can be as low as -18°C (-1°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

December Weather in Glen Carbon: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Glen Carbon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glen Carbon, December typically has an average temperature of 4°C (39°F), with highs reaching up to 21°C (71°F) and lows dropping to around -18°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec323547556877807672594439
Data source: Temperature data for Glen Carbon 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 Glen Carbon

In Glen Carbon in December, the total precipitation amount is 62 mm (2.4 in) observed over a span of 7 days.

December Precipitation Trends in Glen Carbon

The chart displays monthly precipitation patterns in Glen Carbon, 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 Glen Carbon, December typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec788013614415410996130591037562
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Glen Carbon

In Glen Carbon in December humidity is 86%. With an average temperature of 4°C (39°F), this humidity feels like a chilly mist enveloping you, making it essential to bundle up while exploring, as each breath comes with a damp chill that can be quite refreshing yet starkly invigorating for travelers.

December Average Humidity in Glen Carbon

This chart illustrates the average monthly humidity levels in Glen Carbon, 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 Glen Carbon is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Glen Carbon

In Glen Carbon in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Glen Carbon, you can check the information here.

Maximum UV Index Levels in Glen Carbon for December

The chart shows the monthly maximum UV Index (UVI) for Glen Carbon 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 Glen Carbon typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111099653
Data source: Glen Carbon 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 Glen Carbon Compares to Other Months

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

This table compares monthly weather conditions in Glen Carbon, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)78 mm (3.1 inches)82%moderate
February Weather2°C (36°F)80 mm (3.2 inches)80%moderate
March Weather8°C (47°F)136 mm (5.4 inches)80%high
April Weather13°C (55°F)144 mm (5.7 inches)80%very high
May Weather20°C (68°F)154 mm (6.1 inches)82%very high
June Weather25°C (77°F)109 mm (4.3 inches)83%extreme
July Weather26°C (80°F)96 mm (3.8 inches)81%very high
August Weather25°C (76°F)130 mm (5.1 inches)80%very high
September Weather22°C (73°F)59 mm (2.3 inches)76%very high
October Weather15°C (59°F)103 mm (4.1 inches)76%high
November Weather7°C (44°F)75 mm (3.0 inches)85%moderate
December Weather4°C (39°F)62 mm (2.4 inches)86%moderate

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