December Weather in Sylva, Russian Federation

Last updated: August 27, 2025

In December, the average temperature in Sylva, Russian Federation hovers around -9°C (16°F). Expect chilly extremes with minimums plummeting to -27°C (-17°F), while the mercury can rise to a maximum of 3°C (37°F). Rainfall is likely, with 49 mm (1.9 in) of precipitation spread over 12 days. Additionally, the air feels quite humid, with an average humidity level of 90%.

December Temperature in Sylva

In December in Sylva, the average temperature is -9°C (16°F), with maximums reaching 3°C (37°F) and minimums plummeting to -27°C (-17°F). Travelers should prepare for extreme cold and dress in layers to stay warm during this frigid month.

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

The chart illustrates December temperature patterns in Sylva, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sylva, December typically has an average temperature of -9°C (16°F), with highs reaching up to 3°C (37°F) and lows dropping to around -27°C (-17°F).

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

December Precipitation in Sylva

In Sylva in December, the total precipitation amount is 49 mm (1.9 in) spread over 12 days.

December Precipitation Trends in Sylva

The chart displays monthly precipitation patterns in Sylva, 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 Sylva, December typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 12 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 Sylva

In Sylva in December, humidity is 90%. With an average temperature of -9°C (16°F), this humidity feels like a challenging mix of bone-chilling cold and dampness that makes traveling outside uncomfortable, as the frigid air clings to your skin and can quickly sap your warmth, leaving you yearning for indoor comforts.

December Average Humidity in Sylva

This chart illustrates the average monthly humidity levels in Sylva, 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 Sylva is approximately 90%, 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 Sylva

In Sylva 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 Sylva.

Maximum UV Index Levels in Sylva for December

The chart shows the monthly maximum UV Index (UVI) for Sylva 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 Sylva typically reaches 1, which falls under the low exposure category.

Data source: Sylva 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 Sylva Compares to Other Months

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

This table compares monthly weather conditions in Sylva, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-12°C (11°F)	39 mm (1.5 inches)	99%	low
February Weather	-10°C (13°F)	48 mm (1.9 inches)	97%	low
March Weather	-5°C (24°F)	47 mm (1.9 inches)	95%	moderate
April Weather	3°C (38°F)	48 mm (1.9 inches)	90%	moderate
May Weather	11°C (52°F)	56 mm (2.2 inches)	79%	high
June Weather	15°C (59°F)	80 mm (3.1 inches)	71%	high
July Weather	19°C (66°F)	105 mm (4.1 inches)	81%	high
August Weather	16°C (61°F)	89 mm (3.5 inches)	80%	high
September Weather	10°C (49°F)	67 mm (2.6 inches)	89%	moderate
October Weather	4°C (40°F)	66 mm (2.6 inches)	91%	moderate
November Weather	-4°C (25°F)	59 mm (2.3 inches)	94%	low
December Weather	-9°C (16°F)	49 mm (1.9 inches)	90%	low