Last updated: August 22, 2025
In December, the average temperature in Montana, Bulgaria hovers around 3°C (38°F), with a minimum of -12°C (11°F) and a maximum reaching 17°C (63°F). Expect about 63 mm (2.5 in) of precipitation spread over 10 days. With an average humidity of 89%, prepare for a rather chilly and damp experience!
In December in Montana, the average temperature is a chilly 3°C (38°F), with maximums reaching a mild 17°C (63°F) and minimums dropping to a frigid -12°C (11°F). Be sure to pack warm clothing and be prepared for a range of temperatures when traveling during this time.
In Montana in December, the precipitation amount is 63 mm (2.5 in) over a span of 10 days.
In Montana in December, humidity is 89%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapping around you, making travel uncomfortable as the dampness seeps into your clothes and lingers in the air, leaving you feeling cold and clammy.
In Montana 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 Montana, you can visit Hourly UV Index in Montana.
UV Risk Categories
Weather in Montana varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Montana, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (33°F) | 55 mm (2.2 inches) | 89% | low |
| February Weather | 4°C (39°F) | 53 mm (2.1 inches) | 85% | moderate |
| March Weather | 7°C (45°F) | 88 mm (3.5 inches) | 83% | high |
| April Weather | 12°C (54°F) | 59 mm (2.3 inches) | 71% | high |
| May Weather | 17°C (63°F) | 77 mm (3.0 inches) | 73% | very high |
| June Weather | 21°C (71°F) | 80 mm (3.2 inches) | 67% | very high |
| July Weather | 24°C (75°F) | 78 mm (3.1 inches) | 68% | very high |
| August Weather | 24°C (76°F) | 27 mm (1.1 inches) | 50% | very high |
| September Weather | 20°C (67°F) | 23 mm (0.9 inches) | 59% | high |
| October Weather | 13°C (56°F) | 64 mm (2.5 inches) | 79% | moderate |
| November Weather | 8°C (46°F) | 49 mm (1.9 inches) | 87% | moderate |
| December Weather | 3°C (38°F) | 63 mm (2.5 inches) | 89% | low |