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December Weather in Kotka, Finland

Last updated: August 23, 2025

In December, the average temperature in Kotka, Finland hovers around -1°C (30°F). Expect chilly days with minimums plummeting to -18°C (0°F) and maximums reaching a modest 6°C (44°F). Prepare for a wet season, with about 81 mm (3.2 in) of precipitation over 16 days and a high average humidity of 96%. Stay warm and dry!

December Temperature in Kotka

In December in Kotka, the average temperature is -1°C (30°F), with maximums reaching 6°C (44°F) and minimums dropping as low as -18°C (0°F). Travelers should be prepared for cold conditions and pack accordingly when visiting during this time.

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

The chart illustrates December temperature patterns in Kotka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kotka, 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 -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec272530385061646254453830
Data source: Temperature data for Kotka 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 Kotka

In Kotka in December, the precipitation amount is 81 mm (3.2 in), falling over the course of 16 days.

December Precipitation Trends in Kotka

The chart displays monthly precipitation patterns in Kotka, 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 Kotka, December typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec555549434848758866866681
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Kotka

In Kotka in December humidity is 96%. With an average temperature of -1°C (30°F), this humidity feels like a chilling dampness that seeps into your clothes, making every step outdoors uncomfortable and invigoratingly biting, leaving you yearning for warmth and shelter while exploring.

December Average Humidity in Kotka

This chart illustrates the average monthly humidity levels in Kotka, 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 Kotka is approximately 96%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec98%96%93%87%75%74%80%85%90%94%94%96%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Kotka

In Kotka 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 Kotka.

Maximum UV Index Levels in Kotka for December

The chart shows the monthly maximum UV Index (UVI) for Kotka 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 Kotka typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113457754211
Data source: Kotka 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 Kotka Compares to Other Months

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

This table compares monthly weather conditions in Kotka, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)55 mm (2.2 inches)98%low
February Weather-4°C (25°F)55 mm (2.2 inches)96%low
March Weather-1°C (30°F)49 mm (1.9 inches)93%moderate
April Weather4°C (39°F)43 mm (1.7 inches)87%moderate
May Weather10°C (50°F)48 mm (1.9 inches)75%moderate
June Weather16°C (61°F)48 mm (1.9 inches)74%high
July Weather18°C (64°F)75 mm (3.0 inches)80%high
August Weather17°C (62°F)88 mm (3.5 inches)85%moderate
September Weather12°C (54°F)66 mm (2.6 inches)90%moderate
October Weather7°C (45°F)86 mm (3.4 inches)94%low
November Weather3°C (38°F)66 mm (2.6 inches)94%low
December Weather-1°C (30°F)81 mm (3.2 inches)96%low

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