nomadseason

December Weather in Collinsville, United States

Last updated: June 24, 2025

In December, the average temperature in Collinsville, United States hovers around 9°C (48°F), with fluctuations ranging from a chilly -7°C (19°F) to a mild 23°C (74°F). Be prepared for some rain, as the region experiences about 159 mm (6.3 in) of precipitation over 12 days. The atmosphere can feel quite humid, with an average humidity of 88%. 🌧️

December Temperature in Collinsville

In December in Collinsville, the average temperature is 9°C (48°F). Maximums can reach 23°C (74°F), while minimums can drop as low as -7°C (19°F). Be prepared for a varied climate, packing layers to enjoy both warm days and chilly nights.

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 9°C (48°F), with highs reaching up to 23°C (74°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec445056627176807975665147
Data source: Temperature data for Collinsville generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 159 mm (6.3 in) spread over a period of 12 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 159 mm (6.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec12219517415210515010613410913286159
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Collinsville

In Collinsville in December, humidity is 88%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill settling into your bones, making outdoor exploration feel heavy and oppressive.

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.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
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)122 mm (4.8 inches)87%moderate
February Weather10°C (50°F)195 mm (7.7 inches)87%high
March Weather13°C (56°F)174 mm (6.9 inches)85%very high
April Weather16°C (62°F)152 mm (6.0 inches)82%very high
May Weather22°C (71°F)105 mm (4.1 inches)83%extreme
June Weather25°C (76°F)150 mm (5.9 inches)82%extreme
July Weather26°C (80°F)105 mm (4.2 inches)78%extreme
August Weather26°C (79°F)134 mm (5.3 inches)67%extreme
September Weather24°C (75°F)109 mm (4.3 inches)64%very high
October Weather19°C (66°F)132 mm (5.2 inches)74%very high
November Weather11°C (52°F)86 mm (3.4 inches)87%high
December Weather9°C (48°F)159 mm (6.3 inches)88%moderate

Compare Collinsville's Climate with Cities Worldwide