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December Weather in Seilles, Belgium

Last updated: August 22, 2025

In Seilles, Belgium, the average temperature in December hovers around 5°C (41°F). Expect chilly conditions, with a minimum temperature dipping to -5°C (24°F), while the highs can reach up to 15°C (59°F). Rainfall is frequent, with 108 mm (4.3 in) expected over approximately 18 days, coupled with a high average humidity of 92%.

December Temperature in Seilles

In December, in Seilles, the average temperature is 5°C (41°F). The maximum can reach 15°C (59°F) and the minimum can be as low as -5°C (24°F). It's a great time to visit for those who enjoy crisp weather and the chance to experience winter activities.

December Weather in Seilles: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Seilles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seilles, December typically has an average temperature of 5°C (41°F), with highs reaching up to 15°C (59°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec384144495664666559534441
Data source: Temperature data for Seilles generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Seilles

In Seilles in December, the precipitation amount is 108 mm (4.3 in) spread over the course of 18 days.

December Precipitation Trends in Seilles

The chart displays monthly precipitation patterns in Seilles, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Seilles, December typically receives around 108 mm (4.3 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec7174794167797986658459108
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Seilles

In Seilles in December humidity is 92%. With an average temperature of 5°C (41°F), this humidity feels like a cold, damp blanket enveloping you, making travel uncomfortable and dampening the spirits of those unprepared for the chill.

December Average Humidity in Seilles

This chart illustrates the average monthly humidity levels in Seilles, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Seilles is approximately 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%85%82%82%80%76%82%89%92%92%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Seilles

In Seilles 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 Seilles.

Maximum UV Index Levels in Seilles for December

The chart shows the monthly maximum UV Index (UVI) for Seilles in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Seilles typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234578875421
Data source: Seilles December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Seilles Compares to Other Months

Weather in Seilles varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Seilles, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Seilles, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)71 mm (2.8 inches)91%low
February Weather5°C (41°F)74 mm (2.9 inches)89%moderate
March Weather7°C (44°F)79 mm (3.1 inches)87%moderate
April Weather10°C (50°F)41 mm (1.6 inches)85%moderate
May Weather13°C (56°F)67 mm (2.6 inches)82%high
June Weather18°C (64°F)79 mm (3.1 inches)82%very high
July Weather19°C (66°F)79 mm (3.1 inches)80%very high
August Weather19°C (66°F)86 mm (3.4 inches)76%high
September Weather15°C (59°F)65 mm (2.6 inches)82%moderate
October Weather12°C (53°F)84 mm (3.3 inches)89%moderate
November Weather7°C (44°F)59 mm (2.3 inches)92%low
December Weather5°C (41°F)108 mm (4.3 inches)92%low

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