Last updated: June 24, 2025
In December, the average temperature in Butte, United States hovers around -2°C (28°F). However, temperatures can dip as low as -26°C (-14°F) and reach a maximum of 19°C (67°F). This month sees approximately 42 mm (1.6 in) of precipitation spread over 4 days, with an average humidity of 79%. Be prepared for chilly conditions and varying weather!
In December in Butte, average temperature is -2°C (28°F). Maximum can reach 19°C (67°F) and minimum can be as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack both warm layers and lighter clothing for milder days.
In Butte in December, the precipitation amount is 42 mm (1.6 in) spread over a period of 4 days.
In Butte in December, humidity is 79%. With an average temperature of -2°C (28°F), this humidity feels like a biting chill that penetrates through layers of clothing, making outdoor activities uncomfortable and urging travelers to seek warmth indoors.
In Butte 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 Butte, you can visit Hourly UV Index in Butte.
UV Risk Categories
Weather in Butte varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Butte, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 21 mm (0.8 inches) | 77% | moderate |
| February Weather | -6°C (22°F) | 22 mm (0.9 inches) | 81% | moderate |
| March Weather | 3°C (37°F) | 69 mm (2.7 inches) | 71% | high |
| April Weather | 7°C (46°F) | 58 mm (2.3 inches) | 75% | very high |
| May Weather | 15°C (59°F) | 127 mm (5.0 inches) | 74% | very high |
| June Weather | 23°C (74°F) | 69 mm (2.7 inches) | 82% | extreme |
| July Weather | 25°C (77°F) | 81 mm (3.2 inches) | 84% | very high |
| August Weather | 23°C (74°F) | 80 mm (3.2 inches) | 82% | very high |
| September Weather | 19°C (67°F) | 68 mm (2.7 inches) | 75% | very high |
| October Weather | 9°C (49°F) | 72 mm (2.8 inches) | 72% | moderate |
| November Weather | 3°C (38°F) | 21 mm (0.8 inches) | 81% | moderate |
| December Weather | -2°C (28°F) | 42 mm (1.6 inches) | 79% | low |