Helsinki Weather in December
Finland · Subarctic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
December in Helsinki sees average temperatures ranging from a low of -4.0°C (24.8°F) to a high of 0.1°C (32.2°F), with a mean of -1.8°C (28.8°F). Compared to the annual average of 6.8°C (44.2°F), this month is 8.6°C cooler than the yearly norm. Precipitation averages 70.0mm, making it approximately 1.0mm wetter than the monthly average of 69.0mm. The city receives an average of 1.1 hours of sunshine per day during December, with relative humidity averaging 86.5%. Wind speeds reach an average maximum of 23.5 km/h. Snowfall averages 31.1cm during December, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Helsinki, with wetter-than-average conditions compared to the rest of the year.
If you're planning outdoor activities in Helsinki, daylight is the variable that matters most. I did a sea kayak tour in June at 10pm — full sun, 18°C, surreal. December gives you 6 hours of gray light, which limits everything. The Nordic summer (June-August) is the outdoor window: 18-22°C, 19 hours of daylight, perfect for island-hopping by ferry. Winter is its own adventure: -5°C, snow cover from January-March, and the sauna-ice-swim cycle is a Helsinki essential. Pack windproof layers year-round — the Baltic breeze cuts hard. September brings fall colors and fewer tourists; my favorite hiking month.
December vs Adjacent Months
| Metric | November | December | January |
|---|---|---|---|
| Mean Temp | 3.0°C (37.4°F) | -1.8°C (28.8°F) | -2.6°C (27.3°F) |
| Rainfall | 78.3mm | 70.0mm | 76.4mm |
| Sunshine | 2.0 hrs | 1.1 hrs | 1.5 hrs |
| Humidity | 86.8% | 86.5% | 87.1% |
| Wind | 25.2 km/h | 23.5 km/h | 26.7 km/h |
| Rainy Days | 15.8 | 12.2 | 9.4 |
| Snowfall | 13.2 cm | 31.1 cm | 39.4 cm |
Seasonal Context
December falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Helsinki in December, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Helsinki in December?
The average temperature in Helsinki during December ranges from -4.0°C (24.8°F) to 0.1°C (32.2°F), with a mean of -1.8°C (28.8°F).
How much does it rain in Helsinki in December?
Helsinki receives an average of 70.0mm of precipitation in December, spread across approximately 12.2 rainy days.
What should I pack for Helsinki in December?
Based on December weather data, pack heavy winter clothing, thermal layers, and a warm coat.
Is December a good time to visit Helsinki?
December is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Helsinki
Cities with Similar December Climate (Subarctic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 60.17°, 24.94°. Timezone: Europe/Helsinki. Last updated: 2026-07-30.