The highest day temperature in December 2025 was 63°F. The lowest night temperature was 39°F. The average values for day and night temperatures during December were 52.1°F и 51.1°F respectivly.

The average sea surface temperature in December 2025 for Sinop was 59.2°F. The maximum and minimum values were 55.0°F and 62.8°F respectively.

You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in December for Sinop is 1.8 in. It makes december the most rainy month of the year.

The average wind speed in December is 10.8 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 Sinop in December is 4.7 hours.