Last updated: August 23, 2025
In Hartola, Finland, the average temperature in December hovers around -2°C (28°F), with a minimum dipping to -21°C (-5°F) and a maximum peaking at 5°C (41°F). Expect about 68 mm (2.7 in) of precipitation spread over 15 days, accompanied by an average humidity level of 96%. Prepare for a chilly, damp month!
In December in Hartola, the average temperature is -2°C (28°F), with a maximum reaching 5°C (41°F) and a minimum dipping as low as -21°C (-5°F). Visitors should be well-prepared for cold weather conditions and pack accordingly to fully enjoy their trip.
In Hartola in December, the total precipitation amount is 68 mm (2.7 in) recorded over a span of 15 days.
In Hartola 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 Hartola 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 Hartola.
UV Risk Categories
Weather in Hartola varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Hartola, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (24°F) | 46 mm (1.8 inches) | 98% | low |
| February Weather | -5°C (23°F) | 43 mm (1.7 inches) | 96% | low |
| March Weather | -2°C (29°F) | 43 mm (1.7 inches) | 93% | moderate |
| April Weather | 3°C (37°F) | 45 mm (1.8 inches) | 87% | moderate |
| May Weather | 9°C (48°F) | 57 mm (2.3 inches) | 75% | moderate |
| June Weather | 15°C (60°F) | 64 mm (2.5 inches) | 74% | high |
| July Weather | 17°C (63°F) | 78 mm (3.1 inches) | 80% | high |
| August Weather | 16°C (61°F) | 89 mm (3.5 inches) | 85% | moderate |
| September Weather | 11°C (52°F) | 67 mm (2.6 inches) | 90% | moderate |
| October Weather | 6°C (43°F) | 78 mm (3.1 inches) | 94% | low |
| November Weather | 2°C (36°F) | 55 mm (2.2 inches) | 94% | low |
| December Weather | -2°C (28°F) | 68 mm (2.7 inches) | 96% | low |