Last updated: August 23, 2025
In Karttula, Finland, the average temperature in December hovers around -4°C (25°F). While it can plummet to a chilling -23°C (-8°F), temperatures may also reach a mild 4°C (39°F). Expect 67 mm (2.6 in) of precipitation spread over 15 days, resulting in an average humidity level of a staggering 98%.
In December in Karttula, the average temperature is -4°C (25°F). The maximum can reach 4°C (39°F) and the minimum can be as low as -23°C (-8°F). Be prepared for cold weather and pack warm clothing if you plan to visit during this time.
In Karttula in December, the precipitation amount is 67 mm (2.6 in) over the course of 15 days.
In Karttula 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 Karttula 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 Karttula.
UV Risk Categories
Weather in Karttula varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Karttula, 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 (20°F) | 42 mm (1.7 inches) | 97% | low |
| March Weather | -3°C (26°F) | 41 mm (1.6 inches) | 95% | moderate |
| April Weather | 2°C (35°F) | 44 mm (1.7 inches) | 87% | moderate |
| May Weather | 8°C (47°F) | 54 mm (2.1 inches) | 78% | moderate |
| June Weather | 15°C (60°F) | 59 mm (2.3 inches) | 74% | high |
| July Weather | 17°C (63°F) | 79 mm (3.1 inches) | 80% | high |
| August Weather | 15°C (60°F) | 98 mm (3.9 inches) | 85% | moderate |
| September Weather | 10°C (50°F) | 91 mm (3.6 inches) | 91% | moderate |
| October Weather | 5°C (41°F) | 86 mm (3.4 inches) | 95% | low |
| November Weather | 1°C (33°F) | 75 mm (2.9 inches) | 94% | low |
| December Weather | -4°C (25°F) | 67 mm (2.6 inches) | 98% | low |