Last updated: June 24, 2025
In December, the average temperature in Williston, United States hovers around -7°C (20°F). However, be prepared for extremes, as temperatures can plummet to a chilling -36°C (-33°F) or rise to a maximum of 11°C (52°F). With an average humidity of 92%, you can expect a damp environment, complemented by 19 mm (0.8 in) of precipitation spread across 5 days. Stay warm and dry!
In December in Williston, the average temperature is -7°C (20°F). Maximums can reach 11°C (52°F) and minimums can be as low as -36°C (-33°F). Travelers should be prepared for extreme cold and significant temperature fluctuations during this time.
In Williston in December, the total precipitation amount is 19 mm (0.8 in), occurring over the course of 5 days.
In Williston in December, humidity is 92%. With an average temperature of -7°C (20°F), this humidity feels like a heavy, icy blanket wrapping around you, making travel uncomfortable as the cold air seems to cling to your skin and create a chilling dampness that seeps into your clothes, leaving you feeling both cold and clammy.
In Williston 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 Williston, you can visit Hourly UV Index in Williston.
UV Risk Categories
Weather in Williston varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Williston, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -10°C (14°F) | 11 mm (0.4 inches) | 89% | low |
| February Weather | -12°C (11°F) | 18 mm (0.7 inches) | 92% | moderate |
| March Weather | -2°C (28°F) | 23 mm (0.9 inches) | 84% | moderate |
| April Weather | 3°C (38°F) | 28 mm (1.1 inches) | 74% | very high |
| May Weather | 12°C (55°F) | 45 mm (1.8 inches) | 73% | very high |
| June Weather | 19°C (66°F) | 74 mm (2.9 inches) | 69% | very high |
| July Weather | 22°C (71°F) | 58 mm (2.3 inches) | 76% | very high |
| August Weather | 20°C (68°F) | 44 mm (1.7 inches) | 74% | very high |
| September Weather | 15°C (58°F) | 59 mm (2.3 inches) | 65% | high |
| October Weather | 5°C (42°F) | 30 mm (1.2 inches) | 71% | moderate |
| November Weather | -2°C (29°F) | 19 mm (0.7 inches) | 84% | low |
| December Weather | -7°C (20°F) | 19 mm (0.8 inches) | 92% | low |