Last updated: August 23, 2025
In December, the average temperature in Siilinjaervi, Finland typically hovers around -4°C (25°F). Expect a chill, with minimums reaching as low as -23°C (-9°F) and a maximum of 4°C (39°F). Alongside the cold, precipitation is common, with about 68 mm (2.7 in) expected over 15 days. Embrace the winter atmosphere, as the average humidity remains high at 98%!
In December in Siilinjaervi, the average temperature is -4°C (25°F), with maximums reaching up to 4°C (39°F) and minimums dropping as low as -23°C (-9°F). Travelers should be prepared for cold weather and dress in layers to stay warm while exploring the area.
In Siilinjaervi in December, the total precipitation amount is 68 mm (2.7 in) recorded over a span of 15 days.
In Siilinjaervi in December humidity is 98%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making every step feel more laborious as you navigate through the frosty air, dampening your spirits as well as your clothes.
In Siilinjaervi in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Siilinjaervi.
UV Risk Categories
Weather in Siilinjaervi varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Siilinjaervi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 49 mm (1.9 inches) | 99% | low |
| February Weather | -7°C (19°F) | 43 mm (1.7 inches) | 98% | low |
| March Weather | -3°C (26°F) | 43 mm (1.7 inches) | 95% | moderate |
| April Weather | 2°C (35°F) | 42 mm (1.6 inches) | 87% | moderate |
| May Weather | 8°C (47°F) | 56 mm (2.2 inches) | 78% | moderate |
| June Weather | 15°C (60°F) | 66 mm (2.6 inches) | 75% | high |
| July Weather | 17°C (64°F) | 84 mm (3.3 inches) | 83% | high |
| August Weather | 15°C (60°F) | 103 mm (4.0 inches) | 88% | moderate |
| September Weather | 10°C (50°F) | 91 mm (3.6 inches) | 92% | moderate |
| October Weather | 5°C (41°F) | 84 mm (3.3 inches) | 95% | low |
| November Weather | 1°C (33°F) | 77 mm (3.0 inches) | 94% | low |
| December Weather | -4°C (25°F) | 68 mm (2.7 inches) | 98% | low |