The highest day temperature in December 2023 was 35°F. The lowest night temperature was -16°F. The average values for day and night temperatures during December were 14.0°F и 12.7°F respectivly.

The average sea surface temperature in December 2023 for Seinajoki was 29.0°F. The maximum and minimum values were 27.2°F and 30.4°F respectively.

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

Precipitation total in December for Seinajoki is 1.5 in.

The average wind speed in December is 7.9 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 Seinajoki in December is 1.3 hours.