Last updated: August 27, 2025
In December, the average temperature in Siedlce, Poland hovers around 1°C (34°F), with minimum temperatures dipping to -18°C (-1°F) and maximums reaching 14°C (58°F). Expect 51 mm (2.0 in) of precipitation spread across 12 days, combined with a high average humidity of 91%.
In December in Siedlce, the average temperature is 1°C (34°F). The maximum can reach 14°C (58°F), and the minimum can be as low as -18°C (-1°F). Travelers should be prepared for cold weather, with the possibility of mild afternoons, so layering is essential for outdoor activities.
In Siedlce in December, the precipitation amount is 51 mm (2.0 in) spread over 12 days.
In Siedlce in December, humidity is 91%. With an average temperature of 1°C (34°F), this humidity feels like an icy embrace, making traveling quite challenging as the air feels heavy and damp, leaving everything damp and cold, and requiring extra layers for comfort.
In Siedlce 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 Siedlce.
UV Risk Categories
Weather in Siedlce varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Siedlce, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 37 mm (1.5 inches) | 91% | low |
| February Weather | 1°C (33°F) | 46 mm (1.8 inches) | 89% | low |
| March Weather | 4°C (39°F) | 39 mm (1.5 inches) | 86% | moderate |
| April Weather | 9°C (48°F) | 56 mm (2.2 inches) | 76% | high |
| May Weather | 14°C (57°F) | 84 mm (3.3 inches) | 58% | high |
| June Weather | 19°C (67°F) | 68 mm (2.7 inches) | 56% | very high |
| July Weather | 20°C (68°F) | 84 mm (3.3 inches) | 56% | very high |
| August Weather | 20°C (68°F) | 100 mm (3.9 inches) | 55% | high |
| September Weather | 15°C (59°F) | 85 mm (3.3 inches) | 68% | high |
| October Weather | 10°C (51°F) | 69 mm (2.7 inches) | 84% | moderate |
| November Weather | 5°C (42°F) | 39 mm (1.5 inches) | 89% | low |
| December Weather | 1°C (34°F) | 51 mm (2.0 inches) | 91% | low |