December Weather in Siros, France

Last updated: August 23, 2025

In December, the average temperature in Siros, France hovers around 8°C (46°F). Expect a chilly range with minimums dipping to -5°C (24°F) and maximums peaking at 19°C (66°F). Be prepared for wet conditions, as precipitation averages 182 mm (7.2 in) over 16 days, complemented by a high humidity level of 87%.

December Temperature in Siros

In December in Siros, the average temperature is 8°C (46°F). Maximums can reach 19°C (66°F), while minimums can dip to as low as -5°C (24°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both mild and chilly days.

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

The chart illustrates December temperature patterns in Siros, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siros, December typically has an average temperature of 8°C (46°F), with highs reaching up to 19°C (66°F) and lows dropping to around -5°C (24°F).

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

December Precipitation in Siros

In Siros in December, the precipitation amount is 182 mm (7.2 in) over the course of 16 days.

December Precipitation Trends in Siros

The chart displays monthly precipitation patterns in Siros, 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 Siros, December typically receives around 182 mm (7.2 inches) of precipitation spread over approximately 16 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 Siros

In Siros in December, humidity is 87%. With an average temperature of 8°C (46°F), this humidity feels like a chilly, damp fog clinging to your skin, making outdoor activities a bit uncomfortable and causing even mild exertion to leave you feeling clammy and cold.

December Average Humidity in Siros

This chart illustrates the average monthly humidity levels in Siros, 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 Siros is approximately 87%, 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 Siros

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

Maximum UV Index Levels in Siros for December

The chart shows the monthly maximum UV Index (UVI) for Siros 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 Siros typically reaches 2, which falls under the low exposure category.

Data source: Siros 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 Siros Compares to Other Months

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

This table compares monthly weather conditions in Siros, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	110 mm (4.3 inches)	86%	low
February Weather	8°C (47°F)	99 mm (3.9 inches)	85%	moderate
March Weather	9°C (49°F)	114 mm (4.5 inches)	82%	high
April Weather	12°C (53°F)	131 mm (5.2 inches)	81%	high
May Weather	15°C (59°F)	155 mm (6.1 inches)	80%	very high
June Weather	18°C (65°F)	152 mm (6.0 inches)	81%	very high
July Weather	20°C (69°F)	130 mm (5.1 inches)	80%	very high
August Weather	20°C (69°F)	99 mm (3.9 inches)	76%	very high
September Weather	18°C (64°F)	104 mm (4.1 inches)	75%	high
October Weather	14°C (57°F)	114 mm (4.5 inches)	81%	moderate
November Weather	9°C (48°F)	134 mm (5.3 inches)	85%	moderate
December Weather	8°C (46°F)	182 mm (7.2 inches)	87%	low