December Weather in Pertteli, Finland

Last updated: August 23, 2025

In December, the average temperature in Pertteli, Finland hovers around -1°C (30°F), with the potential to dip as low as -20°C (-4°F) and reach a maximum of 6°C (44°F). Expect 68 mm (2.7 in) of precipitation spread over 14 days, contributing to an average humidity level of a staggering 95%. Be prepared for chilly and damp conditions during this month!

December Temperature in Pertteli

In December in Pertteli, the average temperature is -1°C (30°F), with maximums reaching 6°C (44°F) and minimums dropping as low as -20°C (-4°F). Travelers should be prepared for cold weather and dress accordingly to fully enjoy their visit.

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

The chart illustrates December temperature patterns in Pertteli, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pertteli, December typically has an average temperature of -1°C (30°F), with highs reaching up to 6°C (44°F) and lows dropping to around -20°C (-4°F).

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

December Precipitation in Pertteli

In Pertteli in December, the precipitation amount is 68 mm (2.7 in) distributed over a period of 14 days.

December Precipitation Trends in Pertteli

The chart displays monthly precipitation patterns in Pertteli, 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 Pertteli, December typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 14 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 Pertteli

In Pertteli 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 Pertteli

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

In Pertteli 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 Pertteli.

Maximum UV Index Levels in Pertteli for December

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

Data source: Pertteli 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 Pertteli Compares to Other Months

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

This table compares monthly weather conditions in Pertteli, 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 (27°F)	51 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)	48 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)	56 mm (2.2 inches)	75%	moderate
June Weather	16°C (62°F)	52 mm (2.1 inches)	75%	high
July Weather	18°C (64°F)	79 mm (3.1 inches)	80%	high
August Weather	16°C (61°F)	85 mm (3.3 inches)	83%	moderate
September Weather	11°C (53°F)	59 mm (2.3 inches)	90%	moderate
October Weather	6°C (44°F)	78 mm (3.1 inches)	93%	low
November Weather	3°C (37°F)	53 mm (2.1 inches)	94%	low
December Weather	-1°C (30°F)	68 mm (2.7 inches)	95%	low