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December Weather in Sayn-Ust, Mongolia

Last updated: August 28, 2025

In December, the average temperature in Sayn-Ust, Mongolia hovers around -18°C (-1°F), with extremes reaching a bone-chilling -40°C (-40°F) at minimum and a balmy 3°C (37°F) at maximum. Expect little to no precipitation, with only about 2 mm (0.1 in) over 0 days of rain, while the air remains saturated with an average humidity of 95%.

December Temperature in Sayn-Ust

In December, in Sayn-Ust, the average temperature is -18°C (1°F). Maximum temperatures can reach 3°C (37°F) while minimums can plunge to an extreme -40°C (-40°F). Travelers should be well-prepared for extreme cold conditions during this time.

December Weather in Sayn-Ust: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sayn-Ust, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sayn-Ust, December typically has an average temperature of -18°C (-1°F), with highs reaching up to 3°C (37°F) and lows dropping to around -40°C (-40°F).
JanFebMarAprMayJunJulAugSepOctNovDec-39294759707367573820-1
Data source: Temperature data for Sayn-Ust generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Sayn-Ust

In Sayn-Ust in December, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

December Precipitation Trends in Sayn-Ust

The chart displays monthly precipitation patterns in Sayn-Ust, 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 Sayn-Ust, December typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec2345816253910632
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sayn-Ust

In Sayn-Ust in December, humidity is 95%. With an average temperature of -18°C (-1°F), this humidity feels like an unforgiving chill that seeps into your bones, making each breath feel heavy and every step a challenge while traveling.

December Average Humidity in Sayn-Ust

This chart illustrates the average monthly humidity levels in Sayn-Ust, 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 Sayn-Ust is approximately 95%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%94%87%67%45%42%46%52%54%63%82%95%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sayn-Ust

In Sayn-Ust 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 Sayn-Ust, you can visit Hourly UV Index in Sayn-Ust.

Maximum UV Index Levels in Sayn-Ust for December

The chart shows the monthly maximum UV Index (UVI) for Sayn-Ust 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 Sayn-Ust typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23571010997522
Data source: Sayn-Ust 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 Sayn-Ust Compares to Other Months

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

This table compares monthly weather conditions in Sayn-Ust, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-19°C (-3°F)2 mm (0.1 inches)97%low
February Weather-13°C (9°F)2 mm (0.1 inches)94%moderate
March Weather-1°C (30°F)3 mm (0.1 inches)87%moderate
April Weather8°C (47°F)5 mm (0.2 inches)67%high
May Weather15°C (60°F)8 mm (0.3 inches)45%very high
June Weather21°C (70°F)16 mm (0.6 inches)42%very high
July Weather23°C (73°F)25 mm (1.0 inches)46%very high
August Weather20°C (67°F)39 mm (1.5 inches)52%very high
September Weather14°C (57°F)10 mm (0.4 inches)54%high
October Weather3°C (38°F)6 mm (0.2 inches)63%moderate
November Weather-7°C (20°F)3 mm (0.1 inches)81%low
December Weather-18°C (-1°F)2 mm (0.1 inches)95%low

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