The highest day temperature in December 2023 was 65°F. The lowest night temperature was 36°F. The average values for day and night temperatures during December were 51.8°F и 48.2°F respectivly.

The average sea surface temperature in December 2023 for Istria was 58.5°F. The maximum and minimum values were 55.0°F and 62.0°F respectively.

Most of the days in December are sunny but you can also expect cloudy and gloomy days.

Precipitation total in December for Istria is 3.1 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 7.0 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Istria in December is 4.7 hours.