Last updated: August 28, 2025
In December, the average temperature in Bayan-Ulaan, Mongolia hovers around -16°C (4°F), with the mercury dipping as low as -35°C (-31°F) during particularly chilly spells and occasionally reaching a maximum of 4°C (39°F). Despite the frigid conditions, precipitation is minimal, averaging just 4 mm (0.2 in) over 0 days. With an average humidity of 89%, it’s a month where every layer counts to stay warm and dry!
In December in Bayan-Ulaan, the average temperature is -16°C (4°F), with a maximum reaching 4°C (39°F) and a minimum dropping as low as -35°C (-31°F). Travelers should be prepared for extreme cold conditions and dress warmly to fully enjoy their visit.
In Bayan-Ulaan in December, the precipitation amount is 4 mm (0.2 in) over the course of 0 days.
In Bayan-Ulaan in December, humidity is 89%. With an average temperature of -16°C (4°F), this humidity feels like an icy blanket wrapping around you, making traveling quite uncomfortable as the cold air combines with the moisture, creating a chilling sensation that seeps into your bones.
In Bayan-Ulaan 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 Bayan-Ulaan, you can visit Hourly UV Index in Bayan-Ulaan.
UV Risk Categories
Weather in Bayan-Ulaan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bayan-Ulaan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -18°C (0°F) | 3 mm (0.1 inches) | 89% | low |
| February Weather | -15°C (6°F) | 8 mm (0.3 inches) | 81% | moderate |
| March Weather | -6°C (22°F) | 13 mm (0.5 inches) | 72% | high |
| April Weather | 2°C (35°F) | 19 mm (0.8 inches) | 69% | very high |
| May Weather | 8°C (47°F) | 25 mm (1.0 inches) | 54% | very high |
| June Weather | 14°C (57°F) | 40 mm (1.6 inches) | 60% | very high |
| July Weather | 16°C (61°F) | 86 mm (3.4 inches) | 64% | very high |
| August Weather | 13°C (56°F) | 91 mm (3.6 inches) | 65% | very high |
| September Weather | 8°C (47°F) | 32 mm (1.2 inches) | 68% | high |
| October Weather | -1°C (31°F) | 12 mm (0.5 inches) | 68% | moderate |
| November Weather | -9°C (17°F) | 6 mm (0.3 inches) | 75% | moderate |
| December Weather | -16°C (4°F) | 4 mm (0.2 inches) | 89% | low |