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December Weather in Sillian, Austria

Last updated: August 22, 2025

In December, the average temperature in Sillian, Austria is a brisk -7°C (20°F), with minimums plummeting to -21°C (-6°F) and maximums reaching a chilly 5°C (40°F). Expect frequent precipitation, averaging 134 mm (5.3 in) over 12 days, and wrap up warm as the average humidity hovers around a damp 90%.

December Temperature in Sillian

In December in Sillian, the average temperature is -7°C (20°F), with maximums reaching 5°C (40°F) and minimums dropping as low as -21°C (-6°F). Be prepared for cold conditions if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Sillian, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sillian, December typically has an average temperature of -7°C (20°F), with highs reaching up to 5°C (40°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec182429354354555649403120
Data source: Temperature data for Sillian 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 Sillian

In Sillian in December, the precipitation amount is 134 mm (5.3 in) over a period of 12 days.

December Precipitation Trends in Sillian

The chart displays monthly precipitation patterns in Sillian, 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 Sillian, December typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec586380102150145170188127119154134
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sillian

In Sillian in December, humidity is 90%. With an average temperature of -7°C (20°F), this humidity feels like an oppressive chill that seeps into your bones, making travel uncomfortable and your breath visible in the frosty air.

December Average Humidity in Sillian

This chart illustrates the average monthly humidity levels in Sillian, 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 Sillian is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%89%86%83%78%79%82%80%83%90%89%90%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sillian

In Sillian 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 Sillian, you can visit Hourly UV Index in Sillian.

Maximum UV Index Levels in Sillian for December

The chart shows the monthly maximum UV Index (UVI) for Sillian 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 Sillian typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec247810101097532
Data source: Sillian 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 Sillian Compares to Other Months

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

This table compares monthly weather conditions in Sillian, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)57 mm (2.3 inches)93%low
February Weather-4°C (24°F)63 mm (2.5 inches)89%moderate
March Weather-2°C (29°F)80 mm (3.2 inches)86%high
April Weather2°C (36°F)102 mm (4.0 inches)83%very high
May Weather6°C (43°F)150 mm (5.9 inches)78%very high
June Weather12°C (54°F)145 mm (5.7 inches)79%very high
July Weather13°C (56°F)170 mm (6.7 inches)82%very high
August Weather13°C (56°F)188 mm (7.4 inches)80%very high
September Weather9°C (49°F)127 mm (5.0 inches)83%high
October Weather5°C (41°F)119 mm (4.7 inches)90%moderate
November Weather-1°C (31°F)154 mm (6.1 inches)89%moderate
December Weather-7°C (20°F)134 mm (5.3 inches)90%low

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