December Weather in Lyons, United States

Last updated: June 24, 2025

In Lyons, United States, the average temperature in December hovers around 3°C (38°F). During this time, temperatures can dip as low as -8°C (18°F) or soar up to 17°C (63°F). Expect considerable precipitation with about 275 mm (10.8 in) over 21 days, and embrace the high humidity at an average of 87%. Stay prepared for a true taste of the season!

December Temperature in Lyons

In December in Lyons, the average temperature is 3°C (38°F), with maximums reaching 17°C (63°F) and minimums dipping as low as -8°C (18°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and mild conditions.

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 3°C (38°F), with highs reaching up to 17°C (63°F) and lows dropping to around -8°C (18°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 275 mm (10.8 in) during a span of 21 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 275 mm (10.8 inches) of precipitation spread over approximately 21 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 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.

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 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	4°C (39°F)	230 mm (9.0 inches)	85%	low
February Weather	3°C (37°F)	290 mm (11.4 inches)	84%	moderate
March Weather	5°C (41°F)	198 mm (7.8 inches)	85%	high
April Weather	8°C (47°F)	193 mm (7.6 inches)	83%	high
May Weather	12°C (54°F)	95 mm (3.7 inches)	83%	very high
June Weather	15°C (60°F)	81 mm (3.2 inches)	83%	very high
July Weather	19°C (67°F)	7 mm (0.3 inches)	82%	very high
August Weather	20°C (68°F)	10 mm (0.4 inches)	74%	very high
September Weather	16°C (60°F)	117 mm (4.6 inches)	71%	very high
October Weather	10°C (50°F)	185 mm (7.3 inches)	81%	moderate
November Weather	6°C (43°F)	230 mm (9.1 inches)	87%	moderate
December Weather	3°C (38°F)	275 mm (10.8 inches)	87%	low