Last updated: August 23, 2025
In Kouvola, Finland during December, the average temperature hovers around -2°C (29°F). Expect chilly conditions, with minimums plummeting to -22°C (-7°F) and a maximum of 6°C (43°F). On top of that, precipitation averages 76 mm (3.0 in) over 16 days, contributing to a notably high average humidity level of 96%.
In December in Kouvola, the average temperature is -2°C (29°F). The maximum can reach 6°C (43°F), while the minimum can drop as low as -22°C (-7°F). Travelers should be prepared for a chilly climate with potential for extreme cold during this time.
In Kouvola in December, the precipitation amount is 76 mm (3.0 in) over a span of 16 days.
In Kouvola in December humidity is 96%. With an average temperature of -2°C (29°F), this humidity feels like a biting chill that penetrates through layers of clothing, making travel outside quite uncomfortable and forcing visitors to seek refuge indoors or bundle up tightly before venturing out.
In Kouvola 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 Kouvola.
UV Risk Categories
Weather in Kouvola varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Kouvola, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (26°F) | 52 mm (2.0 inches) | 98% | low |
| February Weather | -5°C (24°F) | 52 mm (2.1 inches) | 96% | low |
| March Weather | -2°C (29°F) | 46 mm (1.8 inches) | 93% | moderate |
| April Weather | 4°C (39°F) | 44 mm (1.7 inches) | 87% | moderate |
| May Weather | 10°C (51°F) | 50 mm (2.0 inches) | 75% | moderate |
| June Weather | 16°C (62°F) | 52 mm (2.0 inches) | 74% | high |
| July Weather | 18°C (64°F) | 77 mm (3.0 inches) | 80% | high |
| August Weather | 16°C (61°F) | 82 mm (3.2 inches) | 85% | moderate |
| September Weather | 11°C (53°F) | 61 mm (2.4 inches) | 90% | moderate |
| October Weather | 6°C (44°F) | 75 mm (2.9 inches) | 94% | low |
| November Weather | 2°C (36°F) | 56 mm (2.2 inches) | 94% | low |
| December Weather | -2°C (29°F) | 76 mm (3.0 inches) | 96% | low |