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December Weather in Kustavi, Finland

Last updated: August 23, 2025

In December, the average temperature in Kustavi, Finland hovers around 2°C (36°F). Expect minimums that can plunge to -13°C (9°F), while maximums reach up to 7°C (44°F). With precipitation averaging 87 mm (3.4 in) spread over 17 days, and an average humidity level of 89%, be prepared for a damp and chilly month!

December Temperature in Kustavi

In December in Kustavi, the average temperature is 2°C (36°F). The maximum can reach 7°C (44°F), while the minimum can drop to as low as -13°C (9°F). Be prepared for chilly weather and pack warm clothing if you're planning to travel during this time.

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

The chart illustrates December temperature patterns in Kustavi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kustavi, December typically has an average temperature of 2°C (36°F), with highs reaching up to 7°C (44°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec322932384657636356484235
Data source: Temperature data for Kustavi 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 Kustavi

In Kustavi in December, the precipitation amount is 87 mm (3.4 in) over the course of 17 days.

December Precipitation Trends in Kustavi

The chart displays monthly precipitation patterns in Kustavi, 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 Kustavi, December typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec4640402737364767771076987
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Kustavi

In Kustavi in December, humidity is 89%. With an average temperature of 2°C (36°F), this humidity feels like an uncomfortable chill that clings to your skin, making outdoor activities feel even colder and less inviting for traveling.

December Average Humidity in Kustavi

This chart illustrates the average monthly humidity levels in Kustavi, 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 Kustavi is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%89%85%77%78%78%79%86%90%91%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Kustavi

In Kustavi 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 Kustavi.

Maximum UV Index Levels in Kustavi for December

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

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

This table compares monthly weather conditions in Kustavi, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)46 mm (1.8 inches)92%low
February Weather-2°C (29°F)40 mm (1.6 inches)90%low
March Weather0°C (33°F)40 mm (1.6 inches)89%moderate
April Weather3°C (38°F)27 mm (1.1 inches)85%moderate
May Weather8°C (47°F)37 mm (1.5 inches)77%moderate
June Weather14°C (58°F)36 mm (1.4 inches)78%high
July Weather17°C (63°F)47 mm (1.9 inches)78%high
August Weather17°C (63°F)67 mm (2.6 inches)79%moderate
September Weather13°C (56°F)77 mm (3.0 inches)86%moderate
October Weather9°C (48°F)107 mm (4.2 inches)90%low
November Weather5°C (42°F)69 mm (2.7 inches)91%low
December Weather2°C (36°F)87 mm (3.4 inches)89%low

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