December weather forecast
Kotka, Finland

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Weather in December

Concluding the year, December brings the onset of winter in Kotka, with drastically reduced daylight hours and plummeting sea temperatures. The sea temperatures sink to 3.3°C (37.9°F), a stark difference from the warmth of the summer months. The city, once vibrant with the colors of the myriad seasons, is now covered in a blanket of white. December’s weather reiterates the harsh, snowy winters characteristic of Kotka, Finland.

Sea temperature

In December, the average sea temperature in Kotka is 3.3°C (37.9°F).
Note: In the activity of swimming, this state poses an instant danger to life. Breathing control is completely lost, impeding any form of clear thinking. Employing a specialized swimsuit is crucial to minimize thermal loss.

Daylight

December has the shortest days of the year in Kotka, Finland, with an average of 5h and 54min of daylight.
On the first day of December in Kotka, Finland, sunrise is at 08:51 and sunset at 15:10. On the last day of the month, sunrise is at 09:18 and sunset at 15:11 EET.
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Frequently asked questions

What is the water temperature in December in Kotka?

In Kotka, Finland, in December, the average water temperature is 3.3°C (37.9°F). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

What is the month with the shortest days in Kotka?

With an average of 5h and 54min of daylight, December has the shortest days of the year in Kotka.

What is the average length of the day in December in Kotka?

In Kotka, the average day length in December is 5h and 53min.

When is the sunrise / sunset in December in Kotka?

On the first day of December in Kotka, Finland, sunrise is at 08:51 and sunset at 15:10. On the last day of the month, sunrise is at 09:18 and sunset at 15:11 EET.

Average sea temperature in December
Kotka, Finland

Average sea temperature in December - Kotka, Finland
  • Average sea temperature in December: 3.3°C

The best month for swimming (with the highest average sea temperature) is July (18.9°C).
The coldest months (with the lowest average sea temperature) are February and March (-0.2°C).

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Average daylight in December
Kotka, Finland

Average daylight in December - Kotka, Finland
  • Average daylight in December: 5h and 5min

The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).

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Kotka, Finland

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