Helsinki Weather in December

In December, Helsinki averages a high of 1°C (34°F) and a low of -4°C (25°F), from 55 years of daily records (1971–2026).

1°C

Average high

34°F

-4°C

Average low

25°F

11°C

Record high

51°F · December 20, 2015

-26°C

Record low

-14°F · December 29, 1978

What December Is Like in Helsinki

December in Helsinki has become 3.0°C (5.3°F) warmer on average: the 2011–2025 average against 1970–1989.
6 of the 10 warmest Decembers on record in Helsinki have come since 2011.
The coldest December reading, -26°C (-14°F) on December 29, 1978, has not been matched in 48 years.
On average, 21 nights in December drop below freezing.

At least 1 mm of rain falls on 37% of December days, and the month averages 59 mm in total.

Average daytime high in Helsinki, every December since 1971

Warmest: 2006 (5.6°C)Latest: 2025 (4.4°C)10-year averageLong-run average (0.9°C)

See the weather in Helsinki on any December date, year by year.

Source: NOAA GHCN-Daily, Helsinki Kaisaniemi Aws (1971–2026); Helsinki Rautatientori (2009–2015). Averages cover 1971–2026. How we compute this