December Weather in Lyons, United States

Last updated: June 24, 2025

In December, the average temperature in Lyons, United States hovers around -1°C (30°F). Temperatures can swing from a brisk -23°C (-8°F) at their lowest to a pleasant 20°C (69°F) at their highest. Expect about 44 mm (1.7 in) of precipitation spread over 4 days, contributing to a notable average humidity of 83%.

December Temperature in Lyons

In December in Lyons, the average temperature is -1°C (30°F). Maximum temperatures can reach 20°C (69°F), while minimums can plummet to as low as -23°C (-8°F). This varied climate makes Lyons an intriguing destination for travelers seeking both winter and mild weather experiences.

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 -1°C (30°F), with highs reaching up to 20°C (69°F) and lows dropping to around -23°C (-8°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 44 mm (1.7 in) over the course of 4 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 44 mm (1.7 inches) of precipitation spread over approximately 4 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 83%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities uncomfortable and encouraging travelers to seek shelter indoors.

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 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 Lyons

In Lyons in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Lyons, you can visit Hourly UV Index in Lyons.

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 2, which falls under the low 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	-5°C (24°F)	30 mm (1.2 inches)	76%	moderate
February Weather	-5°C (24°F)	30 mm (1.2 inches)	80%	moderate
March Weather	4°C (39°F)	87 mm (3.4 inches)	73%	high
April Weather	9°C (48°F)	71 mm (2.8 inches)	74%	very high
May Weather	16°C (61°F)	151 mm (5.9 inches)	78%	very high
June Weather	24°C (75°F)	122 mm (4.8 inches)	82%	very high
July Weather	25°C (77°F)	69 mm (2.7 inches)	83%	very high
August Weather	23°C (73°F)	115 mm (4.5 inches)	80%	very high
September Weather	20°C (68°F)	82 mm (3.2 inches)	75%	very high
October Weather	11°C (51°F)	87 mm (3.4 inches)	75%	high
November Weather	4°C (39°F)	28 mm (1.1 inches)	82%	moderate
December Weather	-1°C (30°F)	44 mm (1.7 inches)	83%	low