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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 (30°F). Expect chilly conditions with minimums plunging to -18°C (0°F) and a rare maximum of 19°C (67°F). Precipitation is relatively low, totaling 21 mm (0.8 in) over 4 days, while the air feels quite damp with an average humidity of 85%. Prepare for a brisk month ahead!

December Temperature in Lyons

In December in Lyons, the average temperature is -1°C (30°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -18°C (0°F). Travelers should be prepared for a wide range of temperatures, from chilly days to warmer spells.

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 19°C (67°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec262635425063686661443629
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 precipitation amount is 21 mm (0.8 in) over a span 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 21 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec2537646913680908142473021
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 85%. With an average temperature of -1°C (30°F), this humidity feels like a heavy, damp blanket that envelops you, making even short excursions outside feel chilling and uncomfortable.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%86%75%67%67%68%62%63%63%72%80%85%
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 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 Lyons, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46811111212119643
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-3°C (27°F)25 mm (1.0 inches)84%moderate
February Weather-4°C (26°F)37 mm (1.5 inches)85%high
March Weather2°C (35°F)64 mm (2.5 inches)75%very high
April Weather5°C (42°F)69 mm (2.7 inches)67%extreme
May Weather10°C (50°F)136 mm (5.4 inches)67%extreme
June Weather17°C (63°F)80 mm (3.2 inches)68%extreme
July Weather20°C (68°F)89 mm (3.5 inches)62%extreme
August Weather19°C (67°F)81 mm (3.2 inches)63%extreme
September Weather16°C (61°F)42 mm (1.7 inches)63%very high
October Weather7°C (45°F)47 mm (1.9 inches)72%high
November Weather2°C (36°F)30 mm (1.2 inches)79%moderate
December Weather-1°C (30°F)21 mm (0.8 inches)85%moderate

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