December Weather in Saint Clair, United States

Last updated: June 24, 2025

In Saint Clair, United States, the average temperature in December hovers around -4°C (25°F), with a minimum dipping as low as -24°C (-11°F) and a maximum reaching up to 19°C (66°F). This month typically sees 44 mm (1.7 in) of precipitation spread over about 5 days, resulting in a high average humidity of 83%. Be prepared for a chilly, damp atmosphere!

December Temperature in Saint Clair

In December in Saint Clair, the average temperature is -4°C (25°F), with maximums reaching 19°C (66°F) and minimums plunging as low as -24°C (-11°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to ensure comfort during their visit.

December Weather in Saint Clair: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Saint Clair, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Clair, December typically has an average temperature of -4°C (25°F), with highs reaching up to 19°C (66°F) and lows dropping to around -24°C (-11°F).

Data source: Temperature data for Saint Clair generated using information from the Copernicus Climate Change Service.

December Precipitation in Saint Clair

In Saint Clair in December, the precipitation amount is 44 mm (1.7 in) over the course of 5 days.

December Precipitation Trends in Saint Clair

The chart displays monthly precipitation patterns in Saint Clair, 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 Saint Clair, December typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 5 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Saint Clair

In Saint Clair in December, humidity is 83%. With an average temperature of -4°C (25°F), this humidity feels like a chilling fog enveloping you, making every breath feel heavy and damp, which can quickly dampen the spirit of travel as you navigate the frosty landscape.

December Average Humidity in Saint Clair

This chart illustrates the average monthly humidity levels in Saint Clair, 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 Saint Clair is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Saint Clair

In Saint Clair 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 Saint Clair, you can check the information here.

Maximum UV Index Levels in Saint Clair for December

The chart shows the monthly maximum UV Index (UVI) for Saint Clair 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 Saint Clair typically reaches 3, which falls under the moderate exposure category.

Data source: Saint Clair 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 Saint Clair Compares to Other Months

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

This table compares monthly weather conditions in Saint Clair, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (17°F)	34 mm (1.3 inches)	82%	moderate
February Weather	-9°C (17°F)	41 mm (1.6 inches)	84%	moderate
March Weather	1°C (34°F)	68 mm (2.7 inches)	80%	moderate
April Weather	7°C (45°F)	91 mm (3.6 inches)	81%	very high
May Weather	15°C (60°F)	140 mm (5.5 inches)	74%	very high
June Weather	22°C (72°F)	118 mm (4.7 inches)	80%	very high
July Weather	23°C (74°F)	103 mm (4.1 inches)	80%	very high
August Weather	21°C (71°F)	119 mm (4.7 inches)	77%	very high
September Weather	18°C (65°F)	137 mm (5.4 inches)	75%	very high
October Weather	9°C (49°F)	93 mm (3.7 inches)	80%	moderate
November Weather	1°C (35°F)	36 mm (1.4 inches)	87%	moderate
December Weather	-4°C (25°F)	44 mm (1.7 inches)	83%	moderate