Last updated: August 23, 2025
In December, the average temperature in Katariina, Finland hovers around -1°C (30°F). Expect chilly days with minimums plummeting to -18°C (0°F) and maximums reaching a modest 6°C (44°F). Prepare for a wet season, with about 81 mm (3.2 in) of precipitation over 16 days and a high average humidity of 96%. Stay warm and dry!
In December in Katariina, the average temperature is -1°C (30°F), with maximums reaching 6°C (44°F) and minimums dropping as low as -18°C (0°F). Travelers should be prepared for cold conditions and pack accordingly when visiting during this time.
In Katariina in December, the precipitation amount is 81 mm (3.2 in), falling over the course of 16 days.
In Katariina in December humidity is 96%. With an average temperature of -1°C (30°F), this humidity feels like a chilling dampness that seeps into your clothes, making every step outdoors uncomfortable and invigoratingly biting, leaving you yearning for warmth and shelter while exploring.
In Katariina 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 Katariina.
UV Risk Categories
Weather in Katariina varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Katariina, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 55 mm (2.2 inches) | 98% | low |
| February Weather | -4°C (25°F) | 55 mm (2.2 inches) | 96% | low |
| March Weather | -1°C (30°F) | 49 mm (1.9 inches) | 93% | moderate |
| April Weather | 4°C (39°F) | 43 mm (1.7 inches) | 87% | moderate |
| May Weather | 10°C (50°F) | 48 mm (1.9 inches) | 75% | moderate |
| June Weather | 16°C (61°F) | 48 mm (1.9 inches) | 74% | high |
| July Weather | 18°C (64°F) | 75 mm (3.0 inches) | 80% | high |
| August Weather | 17°C (62°F) | 88 mm (3.5 inches) | 85% | moderate |
| September Weather | 12°C (54°F) | 66 mm (2.6 inches) | 90% | moderate |
| October Weather | 7°C (45°F) | 86 mm (3.4 inches) | 94% | low |
| November Weather | 3°C (38°F) | 66 mm (2.6 inches) | 94% | low |
| December Weather | -1°C (30°F) | 81 mm (3.2 inches) | 96% | low |