Last updated: August 28, 2025
In December, the average temperature in Bayan, Mongolia hovers around -15°C (5°F), with extremes reaching as low as -35°C (-31°F) and peaking at 6°C (42°F). During this chilly month, precipitation amounts to only 4 mm (0.2 in) over 1 day, while the air remains quite humid with an average humidity of 86%.
In December in Bayan, the average temperature is -15°C (5°F). Maximum temperatures can reach 6°C (42°F), while the minimum can plummet to as low as -35°C (-31°F). Be prepared for extremely cold weather and pack accordingly for your trip.
In Bayan in December, the precipitation amount is 4 mm (0.2 in) during 1 day.
In Bayan in December, humidity is 86%. With an average temperature of -15°C (5°F), this humidity feels like a biting chill that makes traveling outside quite uncomfortable, as the damp air seeps through layers of clothing, leaving you feeling cold and heavy.
In Bayan 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, you can visit Hourly UV Index in Bayan.
UV Risk Categories
Weather in Bayan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bayan, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -17°C (1°F) | 3 mm (0.1 inches) | 89% | low |
February Weather | -13°C (8°F) | 5 mm (0.2 inches) | 78% | moderate |
March Weather | -3°C (28°F) | 7 mm (0.3 inches) | 66% | moderate |
April Weather | 6°C (42°F) | 18 mm (0.7 inches) | 64% | high |
May Weather | 13°C (55°F) | 20 mm (0.8 inches) | 52% | very high |
June Weather | 18°C (66°F) | 49 mm (1.9 inches) | 59% | very high |
July Weather | 20°C (69°F) | 66 mm (2.6 inches) | 63% | very high |
August Weather | 17°C (64°F) | 74 mm (2.9 inches) | 62% | very high |
September Weather | 12°C (54°F) | 36 mm (1.4 inches) | 65% | high |
October Weather | 2°C (36°F) | 16 mm (0.6 inches) | 65% | moderate |
November Weather | -7°C (20°F) | 10 mm (0.4 inches) | 69% | low |
December Weather | -15°C (5°F) | 4 mm (0.2 inches) | 86% | low |