December Weather in Onon, Mongolia

Last updated: August 28, 2025

In Onon, Mongolia, the average temperature for December hovers around -19°C (-2°F). Prepare for chilling extremes, as temperatures can plunge to a minimum of -43°C (-45°F), while occasionally peaking at a cozy 2°C (36°F). Expect a touch of dampness with 4 mm (0.1 in) of precipitation spread over just 1 day, coupled with a high average humidity of 90%. Bundle up!

December Temperature in Onon

In December in Onon, the average temperature is -19°C (-2°F), with a maximum that can reach 2°C (36°F) and a minimum that can drop as low as -43°C (-45°F). Travelers should be prepared for extremely cold conditions and dress accordingly to ensure comfort and safety during their visit.

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

The chart illustrates December temperature patterns in Onon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onon, December typically has an average temperature of -19°C (-2°F), with highs reaching up to 2°C (36°F) and lows dropping to around -43°C (-45°F).

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

December Precipitation in Onon

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

December Precipitation Trends in Onon

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

In Onon in December, humidity is 90%. With an average temperature of -19°C (-2°F), this humidity feels like a biting chill that cuts through your layers, making outdoor travel uncomfortable and forcing you to seek shelter often.

December Average Humidity in Onon

This chart illustrates the average monthly humidity levels in Onon, 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 Onon is approximately 90%, 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 Onon

In Onon 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 Onon.

Maximum UV Index Levels in Onon for December

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

Data source: Onon 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 Onon Compares to Other Months

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

This table compares monthly weather conditions in Onon, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-22°C (-7°F)	2 mm (0.1 inches)	92%	low
February Weather	-18°C (0°F)	5 mm (0.2 inches)	86%	moderate
March Weather	-6°C (22°F)	6 mm (0.2 inches)	72%	moderate
April Weather	4°C (39°F)	16 mm (0.6 inches)	67%	high
May Weather	10°C (51°F)	35 mm (1.4 inches)	69%	very high
June Weather	17°C (63°F)	71 mm (2.8 inches)	67%	very high
July Weather	19°C (66°F)	118 mm (4.6 inches)	79%	very high
August Weather	16°C (61°F)	95 mm (3.7 inches)	79%	very high
September Weather	10°C (51°F)	42 mm (1.6 inches)	82%	high
October Weather	0°C (33°F)	20 mm (0.8 inches)	79%	moderate
November Weather	-10°C (14°F)	7 mm (0.3 inches)	81%	moderate
December Weather	-19°C (-2°F)	4 mm (0.1 inches)	90%	low