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December Weather in Karis, Finland

Last updated: August 23, 2025

In Karis, Finland, the average temperature in December hovers around 1°C (33°F). During this chilly period, temperatures can dip as low as -14°C (8°F) or rise to a maximum of 7°C (45°F). Expect 80 mm (3.1 in) of precipitation across 17 days, contributing to an average humidity level of 90%. Prepare for a notably wet and cold month!

December Temperature in Karis

In December in Karis, the average temperature is 1°C (33°F). Maximums can reach 7°C (45°F) and minimums can drop to as low as -14°C (8°F). Be prepared for cold weather and dress in warm layers if you plan to travel during this time.

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

The chart illustrates December temperature patterns in Karis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karis, December typically has an average temperature of 1°C (33°F), with highs reaching up to 7°C (45°F) and lows dropping to around -14°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec302832394860646355474033
Data source: Temperature data for Karis 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 Karis

In Karis in December, the total precipitation amount is 80 mm (3.1 in) spread over 17 days.

December Precipitation Trends in Karis

The chart displays monthly precipitation patterns in Karis, 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 Karis, December typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec6050553647467386711107680
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Karis

In Karis in December humidity is 90%. With an average temperature of 1°C (33°F), this humidity feels like a bone-chilling dampness that seeps into your clothes, making every step outside feel heavy and uncomfortable for traveling.

December Average Humidity in Karis

This chart illustrates the average monthly humidity levels in Karis, 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 Karis is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%91%90%87%76%80%80%83%87%90%91%90%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Karis

In Karis 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 Karis.

Maximum UV Index Levels in Karis for December

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

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

This table compares monthly weather conditions in Karis, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)60 mm (2.3 inches)92%low
February Weather-2°C (28°F)50 mm (2.0 inches)91%low
March Weather0°C (32°F)55 mm (2.2 inches)90%moderate
April Weather4°C (39°F)36 mm (1.4 inches)87%moderate
May Weather9°C (48°F)47 mm (1.9 inches)76%moderate
June Weather15°C (60°F)46 mm (1.8 inches)80%high
July Weather18°C (64°F)73 mm (2.9 inches)80%high
August Weather17°C (63°F)86 mm (3.4 inches)83%moderate
September Weather13°C (55°F)71 mm (2.8 inches)87%moderate
October Weather8°C (47°F)110 mm (4.3 inches)90%low
November Weather5°C (41°F)76 mm (3.0 inches)91%low
December Weather1°C (33°F)80 mm (3.1 inches)90%low

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