Last updated: August 28, 2025
In December, the average temperature in Bayan-Ovoo, Mongolia hovers around -18°C (0°F), making it a chilly time of year. The temperature can dip as low as -40°C (-39°F) and peak at a maximum of 0°C (33°F). Despite the cold, you can expect minimal precipitation, with only 3 mm (0.1 in) of rain falling over 0 days. Humidity levels are notably high at 90%, adding to the crisp atmosphere.
In December in Bayan-Ovoo, the average temperature is -18°C (0°F), with maximums reaching 0°C (33°F) and minimums dropping as low as -40°C (-39°F). Travelers should be prepared for extreme cold conditions and dress warmly to enjoy outdoor activities.
In Bayan-Ovoo in December, the precipitation amount is 3 mm (0.1 in) during a total of 0 days.
In Bayan-Ovoo in December, humidity is 90%. With an average temperature of -18°C (0°F), this humidity feels like a biting chill that seeps through layers of clothing, making travel uncomfortable and requiring extra preparation to handle the oppressive cold.
In Bayan-Ovoo in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Bayan-Ovoo.
UV Risk Categories
Weather in Bayan-Ovoo varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bayan-Ovoo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -21°C (-6°F) | 2 mm (0.1 inches) | 92% | low |
| February Weather | -18°C (0°F) | 6 mm (0.2 inches) | 86% | moderate |
| March Weather | -6°C (22°F) | 6 mm (0.3 inches) | 72% | moderate |
| April Weather | 4°C (39°F) | 15 mm (0.6 inches) | 67% | high |
| May Weather | 11°C (51°F) | 32 mm (1.3 inches) | 69% | very high |
| June Weather | 17°C (63°F) | 61 mm (2.4 inches) | 67% | very high |
| July Weather | 19°C (67°F) | 113 mm (4.5 inches) | 79% | very high |
| August Weather | 16°C (61°F) | 95 mm (3.8 inches) | 79% | very high |
| September Weather | 10°C (51°F) | 51 mm (2.0 inches) | 82% | high |
| October Weather | 1°C (33°F) | 20 mm (0.8 inches) | 79% | moderate |
| November Weather | -10°C (15°F) | 6 mm (0.2 inches) | 81% | low |
| December Weather | -18°C (0°F) | 3 mm (0.1 inches) | 90% | low |