Last updated: August 27, 2025
In December, the average temperature in Flen, Sweden hovers around 1°C (33°F). You might experience chilly lows dipping to -19°C (-3°F), while highs can reach a mild 9°C (49°F). Expect 55 mm (2.2 in) of precipitation spread over 13 days, contributing to a notably high average humidity of 90%.
In December in Flen, the average temperature is 1°C (33°F). Maximums can reach 9°C (49°F), while minimums can drop as low as -19°C (-3°F). Travelers should be prepared for a chilly climate and dress accordingly.
In Flen in December, the precipitation amount is 55 mm (2.2 in) spread over 13 days.
In Flen in December humidity is 90%. With an average temperature of 1°C (33°F), this humidity feels like a bone-chilling dampness that seeps into your clothes, making every step outside feel heavy and uncomfortable for traveling.
In Flen 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 Flen.
UV Risk Categories
Weather in Flen varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Flen, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 37 mm (1.4 inches) | 91% | low |
| February Weather | -1°C (31°F) | 31 mm (1.2 inches) | 89% | low |
| March Weather | 2°C (35°F) | 42 mm (1.7 inches) | 88% | moderate |
| April Weather | 5°C (42°F) | 30 mm (1.2 inches) | 82% | moderate |
| May Weather | 11°C (52°F) | 60 mm (2.3 inches) | 71% | moderate |
| June Weather | 17°C (62°F) | 50 mm (2.0 inches) | 69% | high |
| July Weather | 18°C (65°F) | 65 mm (2.6 inches) | 67% | high |
| August Weather | 17°C (62°F) | 77 mm (3.0 inches) | 72% | high |
| September Weather | 13°C (55°F) | 61 mm (2.4 inches) | 83% | moderate |
| October Weather | 8°C (47°F) | 71 mm (2.8 inches) | 89% | low |
| November Weather | 4°C (39°F) | 47 mm (1.9 inches) | 91% | low |
| December Weather | 1°C (33°F) | 55 mm (2.2 inches) | 90% | low |