December Weather in Altan, Mongolia

Last updated: August 28, 2025

In December, the average temperature in Altan, Mongolia is a brisk -20°C (-4°F). Expect lows that can plunge to a frigid -39°C (-38°F), while the mercury may rise to a maximum of -3°C (27°F). During this icy month, total precipitation is a mere 4 mm (0.1 in) occurring over just 1 day, with average humidity soaring to a chilly 96%.

December Temperature in Altan

In December in Altan, the average temperature is -20°C (-4°F). Maximum temperatures can reach -3°C (27°F), while minimums can plummet to as low as -39°C (-38°F). Travelers should prepare for extremely cold conditions and dress accordingly to ensure comfort and safety.

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

The chart illustrates December temperature patterns in Altan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altan, December typically has an average temperature of -20°C (-4°F), with highs reaching up to -3°C (27°F) and lows dropping to around -39°C (-38°F).

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

December Precipitation in Altan

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

December Precipitation Trends in Altan

The chart displays monthly precipitation patterns in Altan, 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 Altan, 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 Altan

In Altan in December, humidity is 96%. With an average temperature of -20°C (-4°F), this humidity feels like trudging through a frozen fog that clings to your skin, making every breath a sharp reminder of the biting cold, while the damp air exacerbates the chill, creating an uncomfortable atmosphere for traveling.

December Average Humidity in Altan

This chart illustrates the average monthly humidity levels in Altan, 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 Altan is approximately 96%, 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 Altan

In Altan 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 Altan.

Maximum UV Index Levels in Altan for December

The chart shows the monthly maximum UV Index (UVI) for Altan 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 Altan typically reaches 1, which falls under the low exposure category.

Data source: Altan 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 Altan Compares to Other Months

Weather in Altan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Altan, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Altan, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-21°C (-6°F)	2 mm (0.1 inches)	98%	low
February Weather	-18°C (1°F)	5 mm (0.2 inches)	94%	moderate
March Weather	-7°C (20°F)	6 mm (0.2 inches)	88%	moderate
April Weather	4°C (40°F)	11 mm (0.4 inches)	74%	high
May Weather	11°C (52°F)	12 mm (0.5 inches)	50%	very high
June Weather	17°C (63°F)	21 mm (0.8 inches)	48%	very high
July Weather	19°C (66°F)	48 mm (1.9 inches)	49%	very high
August Weather	16°C (61°F)	43 mm (1.7 inches)	54%	very high
September Weather	10°C (50°F)	15 mm (0.6 inches)	59%	high
October Weather	0°C (32°F)	12 mm (0.5 inches)	67%	moderate
November Weather	-10°C (14°F)	6 mm (0.2 inches)	86%	low
December Weather	-20°C (-4°F)	4 mm (0.1 inches)	96%	low