Last updated: August 23, 2025
In Pornainen, Finland, the average temperature in December hovers around -2°C (29°F). However, you can expect a notable range, with minimum temperatures dipping to -19°C (-3°F) and peaking at a mild 6°C (44°F). This month brings approximately 71 mm (2.8 in) of precipitation over 14 days, contributing to a significant average humidity of 96%. Prepare for a chilly and damp experience!
In December in Pornainen, the average temperature is -2°C (29°F). Maximum temperatures can reach 6°C (44°F), while minimums can drop to a chilling -19°C (-3°F). Travelers should be prepared for a wide range of cold weather conditions during this time.
In Pornainen in December, the precipitation amount is 71 mm (2.8 in) over a duration of 14 days.
In Pornainen 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 Pornainen 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 Pornainen.
UV Risk Categories
Weather in Pornainen varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Pornainen, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 53 mm (2.1 inches) | 98% | low |
| February Weather | -4°C (25°F) | 47 mm (1.8 inches) | 96% | low |
| March Weather | -1°C (30°F) | 49 mm (1.9 inches) | 93% | moderate |
| April Weather | 4°C (40°F) | 48 mm (1.9 inches) | 87% | moderate |
| May Weather | 10°C (51°F) | 54 mm (2.1 inches) | 75% | moderate |
| June Weather | 17°C (62°F) | 63 mm (2.5 inches) | 74% | high |
| July Weather | 18°C (64°F) | 83 mm (3.3 inches) | 80% | high |
| August Weather | 16°C (61°F) | 80 mm (3.2 inches) | 85% | moderate |
| September Weather | 11°C (53°F) | 68 mm (2.7 inches) | 90% | moderate |
| October Weather | 6°C (44°F) | 81 mm (3.2 inches) | 94% | low |
| November Weather | 3°C (37°F) | 55 mm (2.2 inches) | 94% | low |
| December Weather | -2°C (29°F) | 71 mm (2.8 inches) | 96% | low |