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December Weather in Sienno, Poland

Last updated: August 27, 2025

In December, the average temperature in Sienno, Poland hovers around 1°C (35°F). Expect chilly minimums of -14°C (7°F) and maximums reaching 14°C (57°F). During this month, precipitation averages around 47 mm (1.9 in) over 11 days, while the air remains notably humid with an average of 91% humidity. Prepare accordingly for a brisk and damp winter experience!

December Temperature in Sienno

In December in Sienno, the average temperature is 1°C (35°F). The maximum can reach 14°C (57°F), and the minimum can be as low as -14°C (7°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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

The chart illustrates December temperature patterns in Sienno, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sienno, December typically has an average temperature of 1°C (35°F), with highs reaching up to 14°C (57°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec313339485767686859504234
Data source: Temperature data for Sienno 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 Sienno

In Sienno in December, the total precipitation amount is 47 mm (1.9 in) over the course of 11 days.

December Precipitation Trends in Sienno

The chart displays monthly precipitation patterns in Sienno, 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 Sienno, December typically receives around 47 mm (1.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec3644385685648510879693947
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sienno

In Sienno in December humidity is 91%. With an average temperature of 1°C (35°F), this humidity feels like an icy mist clinging to your skin, making every step outside a challenge as you contend with the chill and dampness that wraps around you, dampening the joy of exploration.

December Average Humidity in Sienno

This chart illustrates the average monthly humidity levels in Sienno, 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 Sienno is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%76%58%56%56%55%68%84%89%91%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sienno

In Sienno 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 Sienno.

Maximum UV Index Levels in Sienno for December

The chart shows the monthly maximum UV Index (UVI) for Sienno 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 Sienno typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578876321
Data source: Sienno 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 Sienno Compares to Other Months

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

This table compares monthly weather conditions in Sienno, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)36 mm (1.4 inches)91%low
February Weather1°C (33°F)44 mm (1.7 inches)89%low
March Weather4°C (39°F)38 mm (1.5 inches)86%moderate
April Weather9°C (48°F)56 mm (2.2 inches)76%moderate
May Weather14°C (57°F)85 mm (3.4 inches)58%high
June Weather19°C (67°F)64 mm (2.5 inches)56%very high
July Weather20°C (68°F)85 mm (3.4 inches)56%very high
August Weather20°C (68°F)108 mm (4.2 inches)55%high
September Weather15°C (59°F)79 mm (3.1 inches)68%high
October Weather10°C (51°F)69 mm (2.7 inches)84%moderate
November Weather5°C (42°F)38 mm (1.5 inches)89%low
December Weather1°C (35°F)47 mm (1.9 inches)91%low

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