Last updated: August 23, 2025
In December, the average temperature in Lohja, Finland hovers around -1°C (31°F). Visitors should be prepared for chilly conditions, as temperatures can dip as low as -18°C (0°F) and peak at 6°C (44°F). During this time, precipitation is notable, with around 74 mm (2.9 in) of rain or snow spread across 15 days. Additionally, the average humidity remains high at 95%, creating a damp, crisp atmosphere throughout the month.
In December in Lohja, the average temperature is -1°C (31°F), with maximums reaching 6°C (44°F) and minimums dropping as low as -18°C (0°F). This chilly weather calls for warm clothing and preparation for potential cold snaps while exploring the beautiful scenery.
In Lohja in December, the precipitation amount is 74 mm (2.9 in) over the course of 15 days.
In Lohja in December, humidity is 95%. With an average temperature of -1°C (31°F), this humidity feels like an icy weight on your skin, making travel uncomfortable and every breath a challenge as the cold dampness clings to your clothes.
In Lohja 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 Lohja.
UV Risk Categories
Weather in Lohja varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Lohja, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (28°F) | 57 mm (2.3 inches) | 97% | low |
| February Weather | -3°C (26°F) | 49 mm (1.9 inches) | 95% | low |
| March Weather | -1°C (31°F) | 53 mm (2.1 inches) | 93% | moderate |
| April Weather | 3°C (39°F) | 37 mm (1.5 inches) | 86% | moderate |
| May Weather | 10°C (50°F) | 52 mm (2.0 inches) | 75% | moderate |
| June Weather | 16°C (61°F) | 51 mm (2.0 inches) | 75% | high |
| July Weather | 18°C (64°F) | 84 mm (3.3 inches) | 80% | high |
| August Weather | 16°C (62°F) | 82 mm (3.2 inches) | 83% | moderate |
| September Weather | 12°C (54°F) | 63 mm (2.5 inches) | 90% | moderate |
| October Weather | 7°C (45°F) | 89 mm (3.5 inches) | 93% | low |
| November Weather | 3°C (38°F) | 62 mm (2.5 inches) | 94% | low |
| December Weather | -1°C (31°F) | 74 mm (2.9 inches) | 95% | low |