December Weather in Lyons, United States

Last updated: June 24, 2025

In December, the average temperature in Lyons, United States hovers around 12°C (54°F). During this time, temperatures can dip as low as -4°C (25°F) or soar to 27°C (80°F). Expect 123 mm (4.8 in) of precipitation over 9 days, contributing to an average humidity of 87%. Prepare for a mix of chilly and warm days amidst the rain!

December Temperature in Lyons

In December in Lyons, the average temperature is 12°C (54°F). The maximum can reach 27°C (80°F), while the minimum can plummet to as low as -4°C (25°F). Travelers should be prepared for a wide range of weather conditions, making layered clothing a smart choice.

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

The chart illustrates December temperature patterns in Lyons, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lyons, December typically has an average temperature of 12°C (54°F), with highs reaching up to 27°C (80°F) and lows dropping to around -4°C (25°F).

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

December Precipitation in Lyons

In Lyons in December, the precipitation amount is 123 mm (4.8 in) over the course of 9 days.

December Precipitation Trends in Lyons

The chart displays monthly precipitation patterns in Lyons, 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 Lyons, December typically receives around 123 mm (4.8 inches) of precipitation spread over approximately 9 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 Lyons

In Lyons in December humidity is 87%. With an average temperature of 12°C (54°F), this humidity feels like a damp embrace, making it quite uncomfortable for traveling, as the air feels heavy and can quickly sap your energy as you explore the sights.

December Average Humidity in Lyons

This chart illustrates the average monthly humidity levels in Lyons, 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 Lyons is approximately 87%, 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 Lyons

In Lyons 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 Lyons for better planning.

Maximum UV Index Levels in Lyons for December

The chart shows the monthly maximum UV Index (UVI) for Lyons 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 Lyons typically reaches 4, which falls under the moderate exposure category.

Data source: Lyons 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 Lyons Compares to Other Months

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

This table compares monthly weather conditions in Lyons, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	11°C (52°F)	78 mm (3.1 inches)	86%	moderate
February Weather	14°C (57°F)	97 mm (3.8 inches)	81%	high
March Weather	16°C (62°F)	72 mm (2.8 inches)	81%	very high
April Weather	20°C (68°F)	84 mm (3.3 inches)	79%	very high
May Weather	24°C (76°F)	79 mm (3.1 inches)	75%	extreme
June Weather	27°C (80°F)	103 mm (4.1 inches)	75%	extreme
July Weather	29°C (84°F)	124 mm (4.9 inches)	80%	extreme
August Weather	28°C (83°F)	115 mm (4.5 inches)	81%	extreme
September Weather	26°C (80°F)	94 mm (3.7 inches)	83%	very high
October Weather	22°C (72°F)	79 mm (3.1 inches)	78%	very high
November Weather	15°C (58°F)	58 mm (2.3 inches)	85%	high
December Weather	12°C (54°F)	123 mm (4.8 inches)	87%	moderate