Last updated: August 23, 2025
In Heinola, Finland, the average temperature in December hovers around -2°C (28°F). Expect a chilly environment, with minimum temperatures plummeting to -20°C (-4°F) and highs reaching only 5°C (41°F). Precipitation during this month totals 69 mm (2.7 in), typically over 15 days, while the air remains remarkably humid at an average of 96%. Bundle up and prepare for a brisk and damp winter!
In December in Heinola, the average temperature is -2°C (28°F). The maximum can reach 5°C (41°F), while the minimum can drop as low as -20°C (-4°F). It's advisable to pack warm clothing and prepare for variable weather conditions if you're planning to travel during this time.
In Heinola in December, the precipitation amount is 69 mm (2.7 in) over the course of 15 days.
In Heinola in December humidity is 96%. With an average temperature of -2°C (28°F), this humidity feels like a suffocating blanket draped over you, making each breath feel heavy and cold, which can be quite challenging for traveling.
In Heinola 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 Heinola.
UV Risk Categories
Weather in Heinola varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Heinola, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 47 mm (1.9 inches) | 98% | low |
| February Weather | -5°C (23°F) | 44 mm (1.7 inches) | 96% | low |
| March Weather | -2°C (29°F) | 43 mm (1.7 inches) | 93% | moderate |
| April Weather | 3°C (38°F) | 47 mm (1.8 inches) | 87% | moderate |
| May Weather | 9°C (49°F) | 56 mm (2.2 inches) | 75% | moderate |
| June Weather | 15°C (60°F) | 62 mm (2.5 inches) | 74% | high |
| July Weather | 17°C (63°F) | 80 mm (3.1 inches) | 80% | high |
| August Weather | 16°C (61°F) | 87 mm (3.4 inches) | 85% | moderate |
| September Weather | 11°C (52°F) | 64 mm (2.5 inches) | 90% | moderate |
| October Weather | 6°C (43°F) | 77 mm (3.0 inches) | 94% | low |
| November Weather | 2°C (36°F) | 54 mm (2.1 inches) | 94% | low |
| December Weather | -2°C (28°F) | 69 mm (2.7 inches) | 96% | low |