Last updated: June 24, 2025
In December, the average temperature in Williston, United States hovers around -3°C (26°F), creating a chilly atmosphere for residents and visitors alike. Expect minimum temperatures to plunge as low as -26°C (-14°F), while the mercury can rise to a maximum of 15°C (59°F) on milder days. Over the course of the month, precipitation is likely, with 80 mm (3.2 in) falling during approximately 15 days, contributing to an average humidity of 89%. Stay warm and prepared for the elements!
In December in Williston, the average temperature is -3°C (26°F), with a maximum that can reach 15°C (59°F) and a minimum that can drop as low as -26°C (-14°F). Be prepared for a wide range of temperatures and pack accordingly to ensure a comfortable trip!
In Williston in December, the total precipitation amount is 80 mm (3.2 in) spread over 15 days.
In Williston in December, humidity is 89%. With an average temperature of -3°C (26°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring layered clothing to stay warm as you explore.
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 | -7°C (20°F) | 84 mm (3.3 inches) | 93% | low |
| February Weather | -5°C (23°F) | 81 mm (3.2 inches) | 92% | moderate |
| March Weather | -1°C (30°F) | 77 mm (3.0 inches) | 86% | moderate |
| April Weather | 6°C (43°F) | 109 mm (4.3 inches) | 85% | very high |
| May Weather | 13°C (56°F) | 91 mm (3.6 inches) | 80% | very high |
| June Weather | 18°C (65°F) | 97 mm (3.8 inches) | 74% | very high |
| July Weather | 21°C (71°F) | 108 mm (4.2 inches) | 76% | very high |
| August Weather | 20°C (69°F) | 87 mm (3.4 inches) | 75% | very high |
| September Weather | 16°C (62°F) | 71 mm (2.8 inches) | 78% | high |
| October Weather | 10°C (50°F) | 152 mm (6.0 inches) | 86% | moderate |
| November Weather | 2°C (35°F) | 112 mm (4.4 inches) | 88% | moderate |
| December Weather | -3°C (26°F) | 80 mm (3.2 inches) | 89% | low |