Last updated: June 24, 2025
In Wheaton, United States, the average temperature in December is a chilly -5°C (22°F). While the mercury can dip as low as -28°C (-18°F), you might also experience a milder maximum of 13°C (55°F). Expect about 36 mm (1.4 in) of precipitation over 6 days, coupled with a high average humidity of 84%. Be prepared for a brisk winter experience!
In December in Wheaton, the average temperature is -5°C (22°F), with maximums reaching 13°C (55°F) and minimums dipping as low as -28°C (-18°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to stay comfortable during their visit.
In Wheaton in December, the total precipitation amount is 36 mm (1.4 in), which falls over the course of 6 days.
In Wheaton in December humidity is 84%. With an average temperature of -5°C (22°F), this humidity feels like an uncomfortably damp chill that seeps into your bones, making traveling feel significantly colder and more exhausting than it might otherwise be.
In Wheaton 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 Wheaton, you can visit Hourly UV Index in Wheaton.
UV Risk Categories
Weather in Wheaton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Wheaton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -10°C (14°F) | 19 mm (0.7 inches) | 85% | moderate |
| February Weather | -10°C (14°F) | 18 mm (0.7 inches) | 89% | moderate |
| March Weather | -1°C (31°F) | 37 mm (1.5 inches) | 81% | high |
| April Weather | 5°C (41°F) | 57 mm (2.3 inches) | 82% | high |
| May Weather | 14°C (58°F) | 80 mm (3.2 inches) | 76% | very high |
| June Weather | 22°C (71°F) | 79 mm (3.1 inches) | 81% | very high |
| July Weather | 23°C (74°F) | 87 mm (3.4 inches) | 82% | very high |
| August Weather | 21°C (70°F) | 120 mm (4.7 inches) | 83% | very high |
| September Weather | 17°C (63°F) | 78 mm (3.1 inches) | 82% | high |
| October Weather | 8°C (47°F) | 79 mm (3.1 inches) | 82% | moderate |
| November Weather | 0°C (32°F) | 23 mm (0.9 inches) | 87% | moderate |
| December Weather | -5°C (22°F) | 36 mm (1.4 inches) | 84% | low |