December Weather in Posio, Finland

Last updated: August 23, 2025

In Posio, Finland, the average temperature in December hovers around -7°C (20°F). Minimum temperatures can plummet to -24°C (-10°F), while the mercury may rise to a maximum of 2°C (37°F). This month typically sees 58 mm (2.3 in) of precipitation spread over 16 days, contributing to an average humidity of a staggering 100%.

December Temperature in Posio

In December in Posio, the average temperature is -7°C (20°F), with maximums reaching 2°C (37°F) and minimums dropping to as low as -24°C (-10°F). Travelers should prepare for cold weather conditions and dress warmly to fully enjoy their visit.

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

The chart illustrates December temperature patterns in Posio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Posio, December typically has an average temperature of -7°C (20°F), with highs reaching up to 2°C (37°F) and lows dropping to around -24°C (-10°F).

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

December Precipitation in Posio

In Posio in December, the precipitation amount is 58 mm (2.3 in) over the course of 16 days.

December Precipitation Trends in Posio

The chart displays monthly precipitation patterns in Posio, 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 Posio, December typically receives around 58 mm (2.3 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 Posio

In Posio in December, humidity is 100%. With an average temperature of -7°C (20°F), this humidity feels like an icy suffocation, making travel cumbersome as you battle both the chill and the dampness that clings to your skin, creating an overwhelming sense of discomfort.

December Average Humidity in Posio

This chart illustrates the average monthly humidity levels in Posio, 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 Posio is approximately 100%, 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 Posio

In Posio 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 Posio.

Maximum UV Index Levels in Posio for December

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

Data source: Posio 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 Posio Compares to Other Months

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

This table compares monthly weather conditions in Posio, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (14°F)	43 mm (1.7 inches)	101%	low
February Weather	-10°C (14°F)	40 mm (1.6 inches)	99%	low
March Weather	-6°C (21°F)	44 mm (1.7 inches)	94%	low
April Weather	0°C (32°F)	43 mm (1.7 inches)	88%	moderate
May Weather	5°C (41°F)	49 mm (1.9 inches)	83%	moderate
June Weather	12°C (55°F)	85 mm (3.4 inches)	79%	high
July Weather	15°C (60°F)	76 mm (3.0 inches)	83%	high
August Weather	12°C (55°F)	110 mm (4.3 inches)	87%	moderate
September Weather	7°C (46°F)	82 mm (3.2 inches)	91%	moderate
October Weather	2°C (35°F)	82 mm (3.2 inches)	96%	low
November Weather	-3°C (27°F)	71 mm (2.8 inches)	96%	low
December Weather	-7°C (20°F)	58 mm (2.3 inches)	100%	low