December Weather in Sumiainen, Finland

Last updated: August 23, 2025

In Sumiainen, Finland, the average temperature in December hovers around -3°C (26°F), with lows that can dip to -21°C (-6°F) and highs reaching up to 4°C (40°F). Expect 62 mm (2.4 in) of precipitation spread over 14 days, contributing to an average humidity of an impressive 98%. Bundle up and prepare for a chilly, damp month!

December Temperature in Sumiainen

In December, the average temperature in Sumiainen is -3°C (26°F), with maximums reaching 4°C (40°F) and minimums dropping to as low as -21°C (-6°F). Travelers should be prepared for cold conditions and pack accordingly to enjoy their stay comfortably.

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

The chart illustrates December temperature patterns in Sumiainen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumiainen, December typically has an average temperature of -3°C (26°F), with highs reaching up to 4°C (40°F) and lows dropping to around -21°C (-6°F).

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

December Precipitation in Sumiainen

In Sumiainen in December, the precipitation amount is 62 mm (2.4 in) over a span of 14 days.

December Precipitation Trends in Sumiainen

The chart displays monthly precipitation patterns in Sumiainen, 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 Sumiainen, December typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 14 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 Sumiainen

In Sumiainen in December humidity is 98%. With an average temperature of -3°C (26°F), this humidity feels like a biting chill that creeps into your bones, making traveling uncomfortable and potentially hazardous as you navigate through the frosty air.

December Average Humidity in Sumiainen

This chart illustrates the average monthly humidity levels in Sumiainen, 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 Sumiainen 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 Sumiainen

In Sumiainen 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 Sumiainen.

Maximum UV Index Levels in Sumiainen for December

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

Data source: Sumiainen 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 Sumiainen Compares to Other Months

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

This table compares monthly weather conditions in Sumiainen, 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)	45 mm (1.8 inches)	99%	low
February Weather	-6°C (21°F)	41 mm (1.6 inches)	97%	low
March Weather	-3°C (27°F)	38 mm (1.5 inches)	95%	moderate
April Weather	2°C (35°F)	43 mm (1.7 inches)	87%	moderate
May Weather	8°C (48°F)	60 mm (2.4 inches)	78%	moderate
June Weather	15°C (60°F)	57 mm (2.3 inches)	74%	high
July Weather	17°C (63°F)	71 mm (2.8 inches)	80%	high
August Weather	15°C (60°F)	89 mm (3.5 inches)	85%	moderate
September Weather	10°C (50°F)	80 mm (3.2 inches)	91%	moderate
October Weather	5°C (41°F)	80 mm (3.1 inches)	95%	low
November Weather	1°C (34°F)	62 mm (2.4 inches)	94%	low
December Weather	-3°C (26°F)	62 mm (2.4 inches)	98%	low