Last updated: August 28, 2025
In December, the average temperature in Bayan Uula Sumu, Mongolia hovers at a chilly -13°C (9°F). Expect minimums plunging to -29°C (-20°F), while highs may reach up to 3°C (37°F). Precipitation is minimal, with only 2 mm (0.1 in) falling over 0 days. Additionally, the air remains quite damp, with an average humidity of 80%. Stay warm!
In December in Bayan Uula Sumu, the average temperature is -13°C (9°F). The maximum can reach 3°C (37°F) and the minimum can be as low as -29°C (-20°F). Travelers should be prepared for extreme cold and dress in layers to stay warm during their visit.
In Bayan Uula Sumu in December, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.
In Bayan Uula Sumu in December, humidity is 80%. With an average temperature of -13°C (9°F), this humidity feels like an icy cloak wrapping around you, making every breath a sharp reminder of the cold, while moisture in the air freezes on your skin, creating an atmosphere that can be both enchanting and daunting for traveling.
In Bayan Uula Sumu 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 Uula Sumu, you can visit Hourly UV Index in Bayan Uula Sumu.
UV Risk Categories
Weather in Bayan Uula Sumu varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bayan Uula Sumu, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -14°C (7°F) | 1 mm (0.1 inches) | 82% | low |
| February Weather | -10°C (14°F) | 3 mm (0.1 inches) | 68% | moderate |
| March Weather | -1°C (31°F) | 8 mm (0.3 inches) | 47% | high |
| April Weather | 8°C (46°F) | 8 mm (0.3 inches) | 45% | very high |
| May Weather | 15°C (58°F) | 9 mm (0.3 inches) | 34% | very high |
| June Weather | 20°C (69°F) | 9 mm (0.4 inches) | 35% | very high |
| July Weather | 22°C (73°F) | 25 mm (1.0 inches) | 37% | very high |
| August Weather | 20°C (68°F) | 25 mm (1.0 inches) | 42% | very high |
| September Weather | 15°C (58°F) | 11 mm (0.4 inches) | 43% | high |
| October Weather | 4°C (39°F) | 4 mm (0.1 inches) | 47% | moderate |
| November Weather | -5°C (24°F) | 3 mm (0.1 inches) | 56% | moderate |
| December Weather | -13°C (9°F) | 2 mm (0.1 inches) | 80% | low |