December Weather in Rantasalmi, Finland

Last updated: August 23, 2025

In Rantasalmi, Finland, the average temperature in December hovers around -4°C (26°F), with extremes ranging from a frigid -23°C (-9°F) to a milder 4°C (39°F). Expect 70 mm (2.8 in) of precipitation spread over 15 days, resulting in a notably high average humidity of 95%. Prepare for a chilly, damp atmosphere!

December Temperature in Rantasalmi

In December in Rantasalmi, the average temperature is -4°C (26°F). Maximum temperatures can reach 4°C (39°F), while minimums can plunge as low as -23°C (-9°F). When traveling during this time, be prepared for chilly weather and dress warmly to enjoy your stay.

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

The chart illustrates December temperature patterns in Rantasalmi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rantasalmi, December typically has an average temperature of -4°C (26°F), with highs reaching up to 4°C (39°F) and lows dropping to around -23°C (-9°F).

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

December Precipitation in Rantasalmi

In Rantasalmi in December, the total precipitation amount reaches 70 mm (2.8 in) over the course of 15 days.

December Precipitation Trends in Rantasalmi

The chart displays monthly precipitation patterns in Rantasalmi, 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 Rantasalmi, December typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 15 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Rantasalmi

In Rantasalmi in December humidity is 95%. With average temperature -4°C (26°F), this humidity feels like a chilling fog that wraps around you, making even the simplest outdoor activities feel arduous and uncomfortable for traveling.

December Average Humidity in Rantasalmi

This chart illustrates the average monthly humidity levels in Rantasalmi, 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 Rantasalmi is approximately 95%, 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 Rantasalmi

In Rantasalmi 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 Rantasalmi.

Maximum UV Index Levels in Rantasalmi for December

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

Data source: Rantasalmi 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 Rantasalmi Compares to Other Months

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

This table compares monthly weather conditions in Rantasalmi, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	49 mm (1.9 inches)	98%	low
February Weather	-6°C (21°F)	44 mm (1.7 inches)	96%	low
March Weather	-3°C (27°F)	46 mm (1.8 inches)	93%	moderate
April Weather	2°C (36°F)	46 mm (1.8 inches)	88%	moderate
May Weather	10°C (49°F)	55 mm (2.2 inches)	77%	moderate
June Weather	16°C (61°F)	67 mm (2.6 inches)	75%	high
July Weather	17°C (63°F)	77 mm (3.0 inches)	82%	high
August Weather	15°C (60°F)	81 mm (3.2 inches)	84%	moderate
September Weather	10°C (51°F)	77 mm (3.0 inches)	90%	moderate
October Weather	5°C (42°F)	76 mm (3.0 inches)	93%	low
November Weather	1°C (34°F)	57 mm (2.2 inches)	93%	low
December Weather	-4°C (26°F)	70 mm (2.8 inches)	95%	low