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December Weather in Collinsville, United States

Last updated: June 24, 2025

In December, the average temperature in Collinsville, United States hovers around 10°C (50°F). However, be prepared for a range as the mercury can dip to a chilly -7°C (20°F) or soar up to a balmy 27°C (80°F). With 59 mm (2.3 in) of precipitation over approximately 7 days, don't forget your umbrella! Additionally, the air carries a notable average humidity of 87%, making it feel quite refreshing.

December Temperature in Collinsville

In December in Collinsville, the average temperature is 10°C (50°F). Maximum temperatures can reach 27°C (80°F), while minimums can drop as low as -7°C (20°F). Pack for a range of conditions to fully enjoy your travels!

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

The chart illustrates December temperature patterns in Collinsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Collinsville, December typically has an average temperature of 10°C (50°F), with highs reaching up to 27°C (80°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec454758637380848378665550
Data source: Temperature data for Collinsville 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 Collinsville

In Collinsville in December, the precipitation amount is 59 mm (2.3 in) over a span of 7 days.

December Precipitation Trends in Collinsville

The chart displays monthly precipitation patterns in Collinsville, 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 Collinsville, December typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec578811510613910548941211435359
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Collinsville

In Collinsville in December humidity is 87%. With an average temperature of 10°C (50°F), this humidity feels like a heavy cloak wrapping around you, making every step feel laborious and the air thick with moisture, challenging your comfort while traveling.

December Average Humidity in Collinsville

This chart illustrates the average monthly humidity levels in Collinsville, 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 Collinsville is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Collinsville

In Collinsville 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 Collinsville for better planning.

Maximum UV Index Levels in Collinsville for December

The chart shows the monthly maximum UV Index (UVI) for Collinsville 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 Collinsville typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Collinsville 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 Collinsville Compares to Other Months

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

This table compares monthly weather conditions in Collinsville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)57 mm (2.2 inches)80%moderate
February Weather8°C (47°F)88 mm (3.5 inches)79%high
March Weather15°C (59°F)115 mm (4.5 inches)78%very high
April Weather17°C (64°F)106 mm (4.2 inches)78%very high
May Weather23°C (73°F)138 mm (5.5 inches)81%extreme
June Weather27°C (81°F)105 mm (4.1 inches)78%extreme
July Weather29°C (84°F)47 mm (1.9 inches)73%extreme
August Weather29°C (84°F)94 mm (3.7 inches)66%extreme
September Weather25°C (78°F)121 mm (4.7 inches)65%very high
October Weather19°C (66°F)143 mm (5.6 inches)72%very high
November Weather13°C (55°F)53 mm (2.1 inches)82%high
December Weather10°C (50°F)59 mm (2.3 inches)87%moderate

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