December Weather in Marttila, Finland

Last updated: August 23, 2025

In December, the average temperature in Marttila, Finland hovers around -1°C (30°F). During this time, temperatures can dip as low as -20°C (-4°F), while occasionally reaching a maximum of 7°C (44°F). With an average humidity of 95%, the climate feels notably crisp. Additionally, expect about 69 mm (2.7 in) of precipitation over 13 days, making it a month of both chill and wet conditions.

December Temperature in Marttila

In December in Marttila, the average temperature is -1°C (30°F). The maximum can reach 7°C (44°F), while the minimum can be as low as -20°C (-4°F). Be sure to pack warm clothing and prepare for brisk winter conditions during your visit.

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

The chart illustrates December temperature patterns in Marttila, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marttila, December typically has an average temperature of -1°C (30°F), with highs reaching up to 7°C (44°F) and lows dropping to around -20°C (-4°F).

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

December Precipitation in Marttila

In Marttila in December, the precipitation amount is 69 mm (2.7 in) over the course of 13 days.

December Precipitation Trends in Marttila

The chart displays monthly precipitation patterns in Marttila, 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 Marttila, December typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 13 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 Marttila

In Marttila in December humidity is 95%. With an average temperature of -1°C (30°F), this humidity feels like a frigid cold that seeps into your bones, making it quite uncomfortable for traveling as the dampness clings to your skin and exacerbates the chill in the air.

December Average Humidity in Marttila

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

In Marttila 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 Marttila.

Maximum UV Index Levels in Marttila for December

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

Data source: Marttila 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 Marttila Compares to Other Months

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

This table compares monthly weather conditions in Marttila, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (28°F)	50 mm (2.0 inches)	97%	low
February Weather	-4°C (25°F)	44 mm (1.7 inches)	95%	low
March Weather	-1°C (31°F)	47 mm (1.9 inches)	93%	moderate
April Weather	4°C (39°F)	38 mm (1.5 inches)	86%	moderate
May Weather	10°C (50°F)	55 mm (2.2 inches)	75%	moderate
June Weather	16°C (62°F)	51 mm (2.0 inches)	75%	high
July Weather	18°C (64°F)	78 mm (3.1 inches)	80%	high
August Weather	16°C (61°F)	89 mm (3.5 inches)	83%	moderate
September Weather	12°C (53°F)	58 mm (2.3 inches)	90%	moderate
October Weather	7°C (44°F)	76 mm (3.0 inches)	93%	low
November Weather	3°C (38°F)	53 mm (2.1 inches)	94%	low
December Weather	-1°C (30°F)	69 mm (2.7 inches)	95%	low