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December Weather in Collinsville, United States

Last updated: June 24, 2025

In Collinsville, United States, the average temperature for December hovers around 11°C (52°F). However, be prepared for a wide range: temperatures can dip as low as -5°C (23°F) or soar to a pleasant 27°C (80°F). Rainfall is also a consideration, with an average precipitation of 123 mm (4.8 in) over 13 days, contributing to a generally high humidity level of 88%.

December Temperature in Collinsville

In December in Collinsville, the average temperature is 11°C (52°F). Maximums can reach 27°C (80°F) and minimums can be as low as -5°C (23°F). Be prepared for a range of temperatures, making it ideal for layering your clothing while exploring the area.

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 11°C (52°F), with highs reaching up to 27°C (80°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec485460647379818178695551
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 123 mm (4.8 in) over the course of 13 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 123 mm (4.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec1041481171341141671171289810768123
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 88%. With an average temperature of 11°C (52°F), this humidity feels like a heavy blanket wrapping around you, making travel uncomfortable and the air feel thick, encouraging you to seek shelter or stay hydrated as you explore.

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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec478111111111110864
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 Weather9°C (48°F)104 mm (4.1 inches)85%moderate
February Weather12°C (54°F)148 mm (5.8 inches)84%high
March Weather16°C (60°F)117 mm (4.6 inches)82%very high
April Weather18°C (65°F)133 mm (5.3 inches)82%extreme
May Weather23°C (74°F)114 mm (4.5 inches)82%extreme
June Weather26°C (79°F)167 mm (6.6 inches)79%extreme
July Weather27°C (81°F)117 mm (4.6 inches)82%extreme
August Weather27°C (81°F)128 mm (5.1 inches)77%extreme
September Weather25°C (78°F)98 mm (3.8 inches)74%very high
October Weather20°C (69°F)107 mm (4.2 inches)73%very high
November Weather13°C (55°F)68 mm (2.7 inches)85%high
December Weather11°C (52°F)123 mm (4.8 inches)88%moderate

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