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December Weather in Lyons, United States

Last updated: June 24, 2025

In December, the average temperature in Lyons, United States hovers around 1°C (34°F). During this month, temperatures can dip as low as -25°C (-14°F) or reach up to a pleasant 16°C (62°F). Expect 54 mm (2.1 in) of precipitation spread over 8 days, accompanied by a high average humidity of 86%.

December Temperature in Lyons

In December in Lyons, the average temperature is 1°C (34°F). The maximum can reach 16°C (62°F) and the minimum can be as low as -25°C (-14°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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 (34°F), with highs reaching up to 16°C (62°F) and lows dropping to around -25°C (-14°F).
JanFebMarAprMayJunJulAugSepOctNovDec282939486171757367554034
Data source: Temperature data for Lyons generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Lyons

In Lyons in December, the total precipitation amount reaches 54 mm (2.1 in) over a span of 8 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 54 mm (2.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec68698393138961098557948154
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Lyons

In Lyons in December, humidity is 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)68 mm (2.7 inches)88%moderate
February Weather-2°C (29°F)68 mm (2.7 inches)87%moderate
March Weather4°C (39°F)83 mm (3.3 inches)87%high
April Weather9°C (49°F)93 mm (3.6 inches)87%very high
May Weather16°C (61°F)138 mm (5.4 inches)81%very high
June Weather22°C (71°F)96 mm (3.8 inches)82%very high
July Weather24°C (76°F)109 mm (4.3 inches)81%very high
August Weather23°C (73°F)85 mm (3.3 inches)78%very high
September Weather20°C (67°F)57 mm (2.2 inches)78%very high
October Weather13°C (56°F)94 mm (3.7 inches)82%high
November Weather4°C (40°F)81 mm (3.2 inches)89%moderate
December Weather1°C (34°F)54 mm (2.1 inches)86%low

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