Last updated: June 24, 2025
In December, the average temperature in Lyons, United States hovers around 0°C (32°F), making it a chilly time of year. Expect temperatures to range from a brisk -25°C (-13°F) at their lowest to a mild 16°C (62°F) at their highest. During this month, precipitation is notable, with approximately 64 mm (2.5 in) falling over 10 days. Additionally, the average humidity levels are quite high, sitting at 86%, which adds a unique twist to the winter atmosphere.
In December in Lyons, the average temperature is 0°C (32°F). The maximum can reach 16°C (62°F) and the minimum can be as low as -25°C (-13°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.
In Lyons in December, the precipitation amount is 64 mm (2.5 in) over a span of 10 days.
In Lyons in December humidity is 86%. With an average temperature of 0°C (32°F), this humidity feels like a biting chill that seeps into your bones, making travel feel uncomfortable and damp, as the cold air combines with the moisture to create a brisk sensation that may deter outdoor exploration.
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.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 64 mm (2.5 inches) | 87% | low |
| February Weather | -3°C (27°F) | 66 mm (2.6 inches) | 87% | moderate |
| March Weather | 2°C (37°F) | 64 mm (2.5 inches) | 86% | moderate |
| April Weather | 8°C (47°F) | 87 mm (3.4 inches) | 87% | very high |
| May Weather | 15°C (60°F) | 129 mm (5.1 inches) | 82% | very high |
| June Weather | 21°C (70°F) | 118 mm (4.6 inches) | 81% | very high |
| July Weather | 24°C (75°F) | 68 mm (2.7 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 66 mm (2.6 inches) | 79% | very high |
| September Weather | 18°C (65°F) | 112 mm (4.4 inches) | 79% | high |
| October Weather | 11°C (53°F) | 127 mm (5.0 inches) | 82% | moderate |
| November Weather | 3°C (38°F) | 63 mm (2.5 inches) | 87% | moderate |
| December Weather | 0°C (32°F) | 64 mm (2.5 inches) | 86% | low |