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December Weather in Ruukki, Finland

Last updated: August 23, 2025

In December, the average temperature in Ruukki, Finland hovers around -4°C (25°F). Expect a chilly environment where temperatures can dip as low as -23°C (-9°F) and occasionally reach a maximum of 5°C (41°F). With an average humidity level of 98% and about 50 mm (2.0 in) of precipitation spread over 12 days, be prepared for a damp and frosty experience!

December Temperature in Ruukki

In December in Ruukki, the average temperature is -4°C (25°F). Maximum temperatures can reach 5°C (41°F), while minimums can drop as low as -23°C (-9°F). Be prepared for extremely cold weather and dress accordingly if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Ruukki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ruukki, December typically has an average temperature of -4°C (25°F), with highs reaching up to 5°C (41°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec201825344557625849403225
Data source: Temperature data for Ruukki generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Ruukki

In Ruukki in December, the precipitation amount is 50 mm (2.0 in), occurring over the course of 12 days.

December Precipitation Trends in Ruukki

The chart displays monthly precipitation patterns in Ruukki, 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 Ruukki, December typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec363636365353749270775750
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Ruukki

In Ruukki in December humidity is 98%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making every step feel more laborious as you navigate through the frosty air, dampening your spirits as well as your clothes.

December Average Humidity in Ruukki

This chart illustrates the average monthly humidity levels in Ruukki, 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 Ruukki is approximately 98%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec99%97%93%86%80%76%79%83%89%94%94%98%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Ruukki

In Ruukki 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 Ruukki.

Maximum UV Index Levels in Ruukki for December

The chart shows the monthly maximum UV Index (UVI) for Ruukki 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 Ruukki typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113446643211
Data source: Ruukki 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 Ruukki Compares to Other Months

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

This table compares monthly weather conditions in Ruukki, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)36 mm (1.4 inches)99%low
February Weather-8°C (18°F)36 mm (1.4 inches)97%low
March Weather-4°C (26°F)36 mm (1.4 inches)93%moderate
April Weather1°C (34°F)36 mm (1.4 inches)86%moderate
May Weather7°C (46°F)52 mm (2.1 inches)80%moderate
June Weather14°C (58°F)53 mm (2.1 inches)76%high
July Weather17°C (62°F)74 mm (2.9 inches)79%high
August Weather14°C (58°F)92 mm (3.6 inches)83%moderate
September Weather10°C (50°F)70 mm (2.8 inches)89%moderate
October Weather4°C (40°F)77 mm (3.0 inches)94%low
November Weather0°C (32°F)57 mm (2.2 inches)94%low
December Weather-4°C (25°F)50 mm (2.0 inches)98%low

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