Last updated: June 24, 2025
The average temperature in Willmar, United States during December hovers around -5°C (23°F). Be prepared for a wide range, as temperatures can dip to a chilly -26°C (-15°F) and rise to a mild 13°C (55°F). Expect 39 mm (1.5 in) of precipitation spread over 6 days, with an average humidity level of 84%. Stay warm and dry!
In December in Willmar, the average temperature is -5°C (23°F), with maximums reaching 13°C (55°F) and minimums dropping as low as -26°C (-15°F). Travelers should prepare for cold conditions and consider layering their clothing to stay warm during their visit.
In Willmar in December, the precipitation amount is 39 mm (1.5 in), occurring over the course of 6 days.
In Willmar in December, humidity is 84%. With an average temperature of -5°C (23°F), this humidity feels like an icy blanket wrapping around you, making the cold air bite even deeper and turning travel into a brisk, challenging adventure where each breath comes with a frosty reminder of the chill.
In Willmar 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 Willmar, you can visit Hourly UV Index in Willmar.
UV Risk Categories
Weather in Willmar varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Willmar, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -10°C (15°F) | 20 mm (0.8 inches) | 85% | moderate |
| February Weather | -10°C (15°F) | 22 mm (0.9 inches) | 89% | moderate |
| March Weather | 0°C (32°F) | 54 mm (2.1 inches) | 81% | high |
| April Weather | 6°C (42°F) | 76 mm (3.0 inches) | 82% | high |
| May Weather | 15°C (59°F) | 107 mm (4.2 inches) | 76% | very high |
| June Weather | 22°C (72°F) | 92 mm (3.6 inches) | 81% | very high |
| July Weather | 23°C (74°F) | 105 mm (4.1 inches) | 82% | very high |
| August Weather | 21°C (70°F) | 149 mm (5.9 inches) | 83% | very high |
| September Weather | 17°C (64°F) | 115 mm (4.5 inches) | 82% | high |
| October Weather | 8°C (47°F) | 96 mm (3.8 inches) | 82% | moderate |
| November Weather | 0°C (33°F) | 26 mm (1.0 inches) | 87% | moderate |
| December Weather | -5°C (23°F) | 39 mm (1.5 inches) | 84% | low |