Last updated: August 28, 2025
In December, the average temperature in Undur Sume, Mongolia plummets to -20°C (-4°F), with extremes reaching as low as -39°C (-37°F) and occasionally peaking at 2°C (35°F). Throughout this chilly period, precipitation is minimal, with just 1 mm (0.1 in) falling over 0 days. The air stays notably crisp, with an average humidity of 95%, making it a truly frosty experience!
In December in Undur Sume, the average temperature is -20°C (-4°F). Maximums can reach 2°C (35°F), while minimums can drop as low as -39°C (-37°F). Travelers should be well-prepared for extreme cold and fluctuating temperatures during this time.
In Undur Sume in December, the precipitation amount is 1 mm (0.1 in) during 0 days, indicating a very dry period.
In Undur Sume in December, humidity is 95%. With an average temperature of -20°C (-4°F), this humidity feels like an oppressive weight, making it challenging to breathe and travel comfortably, as the cold air combined with the dampness creates a biting chill that seeps into the bones.
In Undur Sume 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 Undur Sume.
UV Risk Categories
Weather in Undur Sume varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Undur Sume, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -23°C (-9°F) | 2 mm (0.1 inches) | 93% | low |
| February Weather | -19°C (-2°F) | 3 mm (0.1 inches) | 85% | moderate |
| March Weather | -9°C (16°F) | 13 mm (0.5 inches) | 78% | moderate |
| April Weather | 1°C (34°F) | 28 mm (1.1 inches) | 78% | high |
| May Weather | 7°C (45°F) | 39 mm (1.5 inches) | 78% | very high |
| June Weather | 13°C (55°F) | 89 mm (3.5 inches) | 79% | very high |
| July Weather | 15°C (59°F) | 132 mm (5.2 inches) | 81% | very high |
| August Weather | 13°C (56°F) | 147 mm (5.8 inches) | 82% | very high |
| September Weather | 7°C (45°F) | 47 mm (1.9 inches) | 85% | high |
| October Weather | -2°C (28°F) | 29 mm (1.1 inches) | 86% | moderate |
| November Weather | -12°C (11°F) | 11 mm (0.4 inches) | 88% | low |
| December Weather | -20°C (-4°F) | 1 mm (0.1 inches) | 95% | low |