December Weather in Heinaevesi, Finland

Last updated: August 23, 2025

In December, the average temperature in Heinaevesi, Finland hovers around -4°C (25°F). Temperatures can swing dramatically, with a minimum of -23°C (-9°F) and a maximum of 3°C (39°F). Expect 70 mm (2.7 in) of precipitation over approximately 16 days, contributing to a notably high average humidity of 98%.

December Temperature in Heinaevesi

In December in Heinaevesi, the average temperature is -4°C (25°F), with maximums reaching 3°C (39°F) and minimums plummeting as low as -23°C (-9°F). Travelers should be prepared for extremely cold conditions and ensure they have adequate winter gear for outdoor activities.

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

The chart illustrates December temperature patterns in Heinaevesi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heinaevesi, December typically has an average temperature of -4°C (25°F), with highs reaching up to 3°C (39°F) and lows dropping to around -23°C (-9°F).

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

December Precipitation in Heinaevesi

In Heinaevesi in December, the precipitation amount is 70 mm (2.7 in) distributed over 16 days.

December Precipitation Trends in Heinaevesi

The chart displays monthly precipitation patterns in Heinaevesi, 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 Heinaevesi, December typically receives around 70 mm (2.7 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 Heinaevesi

In Heinaevesi in December humidity is 98%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making every step feel more laborious as you navigate through the frosty air, dampening your spirits as well as your clothes.

December Average Humidity in Heinaevesi

This chart illustrates the average monthly humidity levels in Heinaevesi, 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 Heinaevesi is approximately 98%, 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 Heinaevesi

In Heinaevesi 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 Heinaevesi.

Maximum UV Index Levels in Heinaevesi for December

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

Data source: Heinaevesi 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 Heinaevesi Compares to Other Months

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

This table compares monthly weather conditions in Heinaevesi, 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 (21°F)	49 mm (1.9 inches)	99%	low
February Weather	-7°C (20°F)	44 mm (1.7 inches)	98%	low
March Weather	-3°C (27°F)	47 mm (1.8 inches)	95%	moderate
April Weather	2°C (35°F)	43 mm (1.7 inches)	87%	moderate
May Weather	9°C (48°F)	61 mm (2.4 inches)	78%	moderate
June Weather	16°C (61°F)	67 mm (2.6 inches)	75%	high
July Weather	17°C (63°F)	81 mm (3.2 inches)	83%	high
August Weather	15°C (60°F)	87 mm (3.4 inches)	88%	moderate
September Weather	10°C (50°F)	85 mm (3.4 inches)	92%	moderate
October Weather	5°C (41°F)	79 mm (3.1 inches)	95%	low
November Weather	1°C (33°F)	64 mm (2.5 inches)	94%	low
December Weather	-4°C (25°F)	70 mm (2.7 inches)	98%	low