December Weather in Bayan, Mongolia

Last updated: August 28, 2025

In December, the average temperature in Bayan, Mongolia hovers around -17°C (2°F), with extremes ranging from a chilling -36°C (-32°F) to a mild 3°C (37°F). Expect a light precipitation of about 4 mm (0.1 in) over the course of a single day, while the average humidity lingers at a brisk 81%.

December Temperature in Bayan

In December in Bayan, the average temperature is -17°C (2°F), with maximums reaching 3°C (37°F) and minimums plummeting to -36°C (-32°F). Travelers should be prepared for extreme cold conditions and dress accordingly to fully enjoy their visit.

December Weather in Bayan: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Bayan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bayan, December typically has an average temperature of -17°C (2°F), with highs reaching up to 3°C (37°F) and lows dropping to around -36°C (-32°F).

Data source: Temperature data for Bayan generated using information from the Copernicus Climate Change Service.

December Precipitation in Bayan

In Bayan in December, the precipitation amount is 4 mm (0.1 in) over the course of 1 day.

December Precipitation Trends in Bayan

The chart displays monthly precipitation patterns in Bayan, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Bayan, December typically receives around 4 mm (0.1 inches) of precipitation spread over approximately 1 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Bayan

In Bayan in December, humidity is 81%. With an average temperature of -17°C (2°F), this humidity feels like an icy mist clinging to your skin, making travel uncomfortable as every breath escapes in visible puffs, and the cold penetrates deeper with every step taken.

December Average Humidity in Bayan

This chart illustrates the average monthly humidity levels in Bayan, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Bayan is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Bayan

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.

Maximum UV Index Levels in Bayan for December

The chart shows the monthly maximum UV Index (UVI) for Bayan in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Bayan typically reaches 2, which falls under the low exposure category.

Data source: Bayan December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Bayan Compares to Other Months

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.

This table compares monthly weather conditions in Bayan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-19°C (-3°F)	2 mm (0.1 inches)	91%	low
February Weather	-16°C (3°F)	5 mm (0.2 inches)	82%	moderate
March Weather	-5°C (24°F)	6 mm (0.2 inches)	54%	moderate
April Weather	5°C (41°F)	11 mm (0.4 inches)	53%	high
May Weather	13°C (55°F)	25 mm (1.0 inches)	56%	very high
June Weather	19°C (66°F)	41 mm (1.6 inches)	54%	very high
July Weather	21°C (71°F)	74 mm (2.9 inches)	65%	very high
August Weather	18°C (64°F)	80 mm (3.1 inches)	71%	very high
September Weather	13°C (55°F)	39 mm (1.6 inches)	71%	high
October Weather	2°C (37°F)	21 mm (0.8 inches)	68%	moderate
November Weather	-8°C (17°F)	8 mm (0.3 inches)	65%	low
December Weather	-17°C (2°F)	4 mm (0.1 inches)	81%	low