December Weather in Simo, Finland

Last updated: August 23, 2025

In December, the average temperature in Simo, Finland hovers around -5°C (22°F), making it a chilly time of year. Expect temperatures to dip as low as -27°C (-17°F) and occasionally rise to a maximum of 4°C (40°F). With an average humidity of 98%, the air can feel particularly crisp. Be prepared for 67 mm (2.7 in) of precipitation spread over 16 days, ensuring you have the right gear for this frosty month!

December Temperature in Simo

In December in Simo, the average temperature is -5°C (22°F). Maximums can reach 4°C (40°F) and minimums can be as low as -27°C (-17°F). Be prepared for extremely cold conditions and dress in layers if you're planning to travel there this month.

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

The chart illustrates December temperature patterns in Simo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Simo, December typically has an average temperature of -5°C (22°F), with highs reaching up to 4°C (40°F) and lows dropping to around -27°C (-17°F).

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

December Precipitation in Simo

In Simo in December, the precipitation amount is 67 mm (2.7 in) over the course of 16 days.

December Precipitation Trends in Simo

The chart displays monthly precipitation patterns in Simo, 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 Simo, December typically receives around 67 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 Simo

In Simo in December, humidity is 98%. With an average temperature of -5°C (22°F), this humidity feels like a chilling mist wrapping around you, making outdoor travel uncomfortable and extra challenging as the cold dampness seeps into your clothing and saps your energy.

December Average Humidity in Simo

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

In Simo 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 Simo.

Maximum UV Index Levels in Simo for December

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

Data source: Simo 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 Simo Compares to Other Months

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

This table compares monthly weather conditions in Simo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (16°F)	49 mm (1.9 inches)	99%	low
February Weather	-9°C (16°F)	46 mm (1.8 inches)	97%	low
March Weather	-5°C (24°F)	50 mm (2.0 inches)	93%	low
April Weather	0°C (33°F)	40 mm (1.6 inches)	86%	moderate
May Weather	7°C (45°F)	51 mm (2.0 inches)	80%	moderate
June Weather	14°C (57°F)	62 mm (2.4 inches)	76%	high
July Weather	17°C (63°F)	62 mm (2.4 inches)	79%	high
August Weather	14°C (58°F)	86 mm (3.4 inches)	83%	moderate
September Weather	9°C (48°F)	75 mm (3.0 inches)	89%	moderate
October Weather	3°C (38°F)	85 mm (3.3 inches)	94%	low
November Weather	-2°C (30°F)	71 mm (2.8 inches)	94%	low
December Weather	-5°C (22°F)	67 mm (2.7 inches)	98%	low