The highest day temperature in December 2023 was 37°F. The lowest night temperature was 5°F. The average values for day and night temperatures during December were 23.2°F и 22.6°F respectivly.

The average sea surface temperature in December 2023 for Helsinki was 34.5°F. The maximum and minimum values were 31.6°F and 37.4°F respectively.

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

Precipitation total in December for Helsinki is 2.3 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 12.8 mph. It makes December the most windy month of the year for Helsinki.

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 Helsinki in December is 1.6 hours.