December weather forecast
Koper, Slovenia

Weather in December

Sea temperature

In Koper, Slovenia, the average seawater temperature in December is 13.2°C (55.8°F).
Note: Swimming in 13.2°C (55.8°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

With an average of 8h and 46min of daylight, December has the shortest days of the year in Koper.
On the first day of the month, sunrise is at 07:24 and sunset at 16:23. On the last day of December, in Koper, sunrise is at 07:45 and sunset at 16:30 CET.
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FAQ

What is the water temperature in December in Koper?

In Koper, in December, the average water temperature is 13.2°C (55.8°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the month with the shortest days in Koper?

With an average of 8h and 46min of daylight, December has the shortest days of the year in Koper.

How many hours of daylight does Koper have in December?

The average day length in December in Koper, Slovenia, is 8h and 46min.

When are sunrise and sunset in December in Koper?

In December, on the first day of the month, sunrise is at 07:24 and sunset at 16:23. On the last day of the month, sunrise is at 07:45 and sunset at 16:30 CET.

Average sea temperature in December
Koper, Slovenia

Average sea temperature in December - Koper, Slovenia
  • Average sea temperature in December: 13.2°C

The best months for swimming (with the highest average sea temperature) are July and August (24.8°C).
The coldest month (with the lowest average sea temperature) is February (9.3°C).

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Average daylight in December
Koper, Slovenia

Average daylight in December - Koper, Slovenia
  • Average daylight in December: 8h and 46min

The month with the longest days is June (Average daylight: 15h and 38min).
The month with the shortest days is December (Average daylight: 8h and 46min).

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