Last updated: June 24, 2025
In December, the average temperature in Sylvan, United States hovers around -2°C (28°F). Expect temperatures to range from a biting -23°C (-10°F) to a surprisingly mild 18°C (66°F). During this period, the area experiences about 44 mm (1.7 in) of precipitation over approximately 7 days, with an average humidity of 82%, creating a chilly yet unique climate backdrop.
In December in Sylvan, the average temperature is -2°C (28°F), with a maximum reaching 18°C (66°F) and a minimum dropping as low as -23°C (-10°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Sylvan in December, the precipitation amount is 44 mm (1.7 in) spread over a duration of 7 days.
In Sylvan in December, humidity is 82%. With an average temperature of -2°C (28°F), this humidity feels like an icy shroud enveloping you, making every breath feel crisp and biting as you navigate through a winter wonderland, each step a reminder of the contrast between the cold air and the heavy moisture lingering in the atmosphere.
In Sylvan 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 Sylvan, you can visit Hourly UV Index in Sylvan.
UV Risk Categories
Weather in Sylvan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sylvan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 39 mm (1.5 inches) | 84% | low |
| February Weather | -6°C (22°F) | 54 mm (2.1 inches) | 85% | moderate |
| March Weather | 2°C (36°F) | 59 mm (2.3 inches) | 84% | moderate |
| April Weather | 7°C (46°F) | 87 mm (3.4 inches) | 83% | very high |
| May Weather | 15°C (59°F) | 135 mm (5.3 inches) | 75% | very high |
| June Weather | 21°C (70°F) | 125 mm (4.9 inches) | 79% | very high |
| July Weather | 23°C (74°F) | 103 mm (4.1 inches) | 75% | very high |
| August Weather | 21°C (71°F) | 101 mm (4.0 inches) | 69% | very high |
| September Weather | 18°C (65°F) | 120 mm (4.7 inches) | 74% | very high |
| October Weather | 10°C (50°F) | 120 mm (4.7 inches) | 79% | moderate |
| November Weather | 2°C (35°F) | 52 mm (2.1 inches) | 88% | moderate |
| December Weather | -2°C (28°F) | 44 mm (1.7 inches) | 82% | low |