Weather in December
The weather in
Koper during
December fully embraces winter, marking a full circle in the annual weather cycle. The sea temperature sinks further to 13.2°C (55.8°F). The reduced daylight hours accompany the shortest day of the year towards the end of the month. These cold conditions bring out the festive spirit, adding charm to the cityscape with twinkling lights and heartening decorations. Despite the cold, Koper in December radiates warmth, welcoming the holiday season with open arms.
Sea temperature
In Koper, in December, the average water temperature is 13.2°C (55.8°F).
Note: While a brief time in 13.2°C (55.8°F) at 13°C (55.4°F) is already bracing, plunging below 10°C (50°F) can severely affect breathing and introduce a cold shock, relying on your physical state.
Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year.
On the first day of December in Koper,
Slovenia, sunrise is at 07:25 and sunset at 16:23. On the last day of the month, sunrise is at 07:45 and sunset at 16:31 CET.