Last updated: June 24, 2025
In December, the average temperature in Sycamore, United States hovers around 2°C (35°F), with fluctuations ranging from a minimum of -23°C (-9°F) to a comfortable maximum of 17°C (64°F). Prepare for a slightly damp experience, as precipitation amounts to 70 mm (2.7 in) over about 11 days, and the average humidity tends to be a high 86%. Stay warm and dry while exploring this unique destination!
In December in Sycamore, the average temperature is 2°C (35°F). Maximum temperatures can reach 17°C (64°F), while minimums can drop to a chilling -23°C (-9°F). Be prepared for significant temperature fluctuations and dress accordingly when traveling during this time.
In Sycamore in December, the precipitation amount is 70 mm (2.7 in) spread over 11 days.
In Sycamore in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.
In Sycamore 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 Sycamore, you can visit Hourly UV Index in Sycamore.
UV Risk Categories
Weather in Sycamore varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sycamore, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (30°F) | 72 mm (2.9 inches) | 88% | moderate |
| February Weather | 0°C (32°F) | 89 mm (3.5 inches) | 87% | moderate |
| March Weather | 5°C (41°F) | 97 mm (3.8 inches) | 87% | high |
| April Weather | 10°C (50°F) | 110 mm (4.3 inches) | 87% | very high |
| May Weather | 17°C (62°F) | 134 mm (5.3 inches) | 81% | very high |
| June Weather | 22°C (71°F) | 131 mm (5.1 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 123 mm (4.8 inches) | 81% | very high |
| August Weather | 23°C (73°F) | 86 mm (3.4 inches) | 78% | very high |
| September Weather | 20°C (68°F) | 73 mm (2.9 inches) | 78% | very high |
| October Weather | 14°C (57°F) | 93 mm (3.7 inches) | 82% | high |
| November Weather | 5°C (42°F) | 90 mm (3.5 inches) | 89% | moderate |
| December Weather | 2°C (35°F) | 70 mm (2.7 inches) | 86% | low |