December Weather in Mons, Belgium

Last updated: August 21, 2025

December in Mons, Belgium presents a chilly yet captivating winter atmosphere, with temperatures ranging from a brisk -4°C (25°F) to a comfortable 15°C (58°F). The average settles around 5°C (42°F), creating a crisp environment perfect for festive activities. Residents and visitors can expect significant rainfall, totaling 100 mm (4.0 in) across approximately 17 days, contributing to the season's charm. Notably, humidity reigns high at 92%, adding a refreshing bite to the air and enhancing the cozy ambiance of this historic city.

December Temperature in Mons

In December, Mons, Belgium experiences a notable chill as winter firmly takes hold. With temperatures typically ranging from a minimum of -4°C (25°F) to a maximum of 15°C (58°F), the city sets the stage for a crisp and frosty atmosphere. The average temperature hovers around 5°C (42°F), signaling the end of the year with a combination of brisk days and the potential for occasional milder spells. As winter advances, the contrast with the preceding months becomes evident, showcasing a significant drop from the milder temperatures seen in November. This transition not only marks a seasonal shift but also creates an enchanting backdrop for festive celebrations and cozy gatherings in Mons.

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

The chart illustrates December temperature patterns in Mons, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mons, December typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec394145505664666660544542
Data source: Temperature data for Mons 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 Mons

In Belgium's Mons, December stands out as a notably wet month, with precipitation reaching 100 mm (4.0 in)—the highest amount for the year. This rainfall is accompanied by 17 rainy days, making it a significant period for moisture compared to the relatively drier seasons earlier and later in the year. Notably, December's precipitation marks a sharp increase from November's 60 mm (2.4 in) and consistently exceeds the monthly averages from the preceding months. This trend underscores the winter's capacity to deliver substantial rainfall, contributing to the region's rich and vibrant landscape while hinting at the transition from autumn's milder weather to winter's chill.

December Precipitation Trends in Mons

The chart displays monthly precipitation patterns in Mons, 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 Mons, December typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec6772743961606579537860101
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mons

In Mons, Belgium, December ushers in a humidity level of 92%, mirroring the damp chill of November and hinting at the persistence of winter's grip. This month marks one of the highest humidity readings of the year, alongside January, reinforcing a seasonal trend where humidity generally peaks during the colder months. As the year progresses from the mildness of summer—where humidity dips to 76% in August—the gradual rise back to the moist conditions of late fall and winter is unmistakable. Such fluctuations reveal an intriguing pattern; while the warmth of May and June brings relatively lower humidity levels, the transition to winter sees a notable resurgence, creating a cozy yet damp atmosphere typical of Mons in December.

December Average Humidity in Mons

This chart illustrates the average monthly humidity levels in Mons, 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 Mons is approximately {2}%, 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 Mons

In Mons, Belgium, the UV Index experiences a notable shift throughout the year, peaking in the summer months and dipping in winter. By December, the UV Index reaches a low of 1, indicating minimal sun exposure risk—ideal for cozy indoor activities. This trend emphasizes a significant decrease from the previous month's 2, a reflection of the shorter days and cloudier skies. While the sun may be less intense this time of year, it's essential to be mindful of sun exposure, especially during periods of clear weather, as the UV Index will slowly rise again come spring. For more detailed information, visit Mons UV Index.

Maximum UV Index Levels in Mons for December

The chart shows the monthly maximum UV Index (UVI) for Mons 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 Mons typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec224578875421
Data source: Mons 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.

December Sunshine in Mons

In Mons, Belgium, December marks the transition into winter, characterized by a decline in sunlight hours to just 144 hours. This signifies a notable drop from the vibrant hours of spring and summer, which peak in June and July with over 400 hours of sun. As the year winds down, the daylight dwindles more sharply, following a trend that begins in the fall, with November dipping to 193 hours. Despite the cold, December’s shorter days invite a sense of coziness, encouraging locals to embrace the warmth of indoor gatherings while awaiting the brighter days of the coming year.

Monthly Sunshine Duration in Mons: December Highlighted

The December sunshine duration represents the total number of hours Mons experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec120h197h263h349h396h403h412h382h322h251h193h144h
Data source: Mons December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Mons During December

In Mons, Belgium, December's weather is characteristically dreary, with a mere 15% chance of sunny days. This month marks a significant dip compared to the gradually improving sunshine from earlier months. While the likelihood of sun starts at a low 11% in January and gradually rises to a peak of 52% in April, the trend reverses after May, illustrating the onset of winter. By the time we reach December, residents and visitors can expect the gloomy overcast typical of late fall, making those rare glimpses of sunshine feel even more precious.

Percentage of Sunny Days in December in Mons

The chart illustrates the percentage of sunny days in Mons throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Mons experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec11%29%40%52%34%32%33%29%37%33%24%15%
Data source: Mons December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Mons in December

As December settles over Mons, Belgium, the city experiences a return to shorter days, with daylight lasting about 8 hours—the same duration seen in both January and November. This trend of diminishing daylight begins in late fall and continues into the heart of winter, contrasting sharply with the vibrant extended daylight hours of summer months. April through June, in particular, showcases the height of brightness with up to 16 hours of daylight, before gradually tapering off as the year closes. This rhythmic cycle of light and darkness not only influences the daily activities of Mons’ residents but also highlights the enchanting transition of the seasons, each with its own distinct ambiance.

Average Daylight Hours in Mons for December

The chart illustrates the variation in daylight duration in Mons throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 32m10h 3m11h 55m13h 50m15h 29m16h 21m15h 53m14h 24m12h 33m10h 40m8h 58m8h 4m
Data source: Mons daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Mons

As December rolls into Mons, Belgium, the winds begin to whisper a chill in the air, with average speeds reaching 4.2 m/s (9 mph). This slight uptick from November's 3.3 m/s hints at a seasonal shift, as the year winds down. While other winter months such as January and February maintain a similar pace, December’s winds are still moderate, suggesting a balanced transition into the colder season. Notably, June experiences the calmest breaths of wind, while the later months of the year, including October, show a resurgence in activity. Overall, Mons’ December winds reflect a gentle but discernible increase, creating a serene backdrop for the festive spirit of the holiday season.

Average December Wind Speed in Mons

The chart displays monthly wind speed patterns in Mons, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.34.64.03.44.42.83.43.43.04.33.34.2 m/s
Data source: Mons December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Mons Compares to Other Months

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

December and January exhibit similar cold winter conditions, but there are notable differences in their weather patterns. In December, temperatures range from a minimum of -4°C (25°F) to a maximum of 15°C (58°F), with an average of 5°C (42°F). This month is characterized by higher precipitation, totaling 100 mm (4.0 in) over 17 days, contributing to a humidity level of 92%. In contrast, January tends to be slightly colder, with minimum temperatures dropping to -7°C (20°F) and a maximum of 13°C (57°F), averaging around 4°C (39°F). Precipitation also decreases to 67 mm (2.6 in) over 12 days, accompanied by a slightly lower humidity of 91%. For more details on January weather, visit this link: Mons weather in January.

December and February offer a contrasting winter experience, despite their similar average temperatures. In December, temperatures range from a chilly -4°C (25°F) to a mild 15°C (58°F), accompanied by relatively high precipitation of 100 mm (4.0 in) over 17 days, resulting in a humid atmosphere with 92% humidity. In contrast, February sees even colder nights, with minimum temperatures dropping to -8°C (17°F), but the maximums are slightly higher at 18°C (65°F). Additionally, February has less precipitation at 72 mm (2.9 in) over 12 days and a slightly lower humidity at 89%. For more detailed insights on February weather, you can check this link: Mons weather in February.

December weather features cooler temperatures, with lows around -4°C (25°F) and average highs reaching 5°C (42°F). The month experiences relatively high precipitation, totaling about 100 mm (4.0 in) across 17 days, combined with a high humidity level of 92%. In contrast, March sees slightly colder minimum temperatures of -9°C (17°F) but warmer maximums peaking at 23°C (73°F), resulting in an average temperature of 7°C (45°F). Precipitation decreases to 74 mm (2.9 in) over 14 days, with humidity at 87%. For more detailed information, check out Mons weather in March.

December and April showcase contrasting weather patterns that reflect the transition from winter to spring. In December, the temperatures hover between a brisk -4°C (25°F) and a mild 15°C (58°F), with an average of 5°C (42°F), resulting in a chilly environment. The month sees considerable precipitation of 100 mm (4.0 in) over 17 days, accompanied by high humidity at 92%, creating a damp atmosphere. In stark contrast, April experiences more moderate temperatures, with a minimum of -3°C (26°F) and a maximum of 26°C (79°F), averaging at 10°C (50°F). The overall precipitation decreases to 39 mm (1.5 in) over just 9 days, and humidity lowers to 85%, signaling the approach of warmer, drier days. For a more detailed look at the weather during this month, visit Mons weather in April.

December and May present contrasting weather characteristics. In December, temperatures typically range from a chilly -4°C (25°F) to a mild 15°C (58°F), with an average of around 5°C (42°F). The month experiences significant precipitation, totaling 100 mm (4.0 in) over approximately 17 days, and high humidity levels at 92%. In stark contrast, May features more pleasant weather, with temperatures fluctuating between a minimum of 0°C (33°F) and a maximum of 30°C (86°F), averaging 13°C (56°F). Precipitation in May is lower at 61 mm (2.4 in) over 13 days, and humidity is also reduced to 82%. For a closer look at the delightful weather in May, you can check Mons weather in May.

December and June present starkly contrasting weather conditions. In December, temperatures range from a chilly -4°C (25°F) to a milder 15°C (58°F), with an average of 5°C (42°F). The month is characterized by high humidity levels at 92% and frequent precipitation, totaling around 100 mm (4.0 in) over 17 days. In contrast, June warms up significantly, with temperatures starting at a comfortable minimum of 6°C (43°F) and soaring to 32°C (90°F), averaging around 18°C (64°F). Precipitation in June is less severe at about 60 mm (2.4 in) over just 10 days, and humidity lowers to 82%, making for a more pleasant atmosphere. For more detailed information, you can check Mons weather in June.

December and July present contrasting weather patterns. In December, temperatures can drop as low as -4°C (25°F), with an average of 5°C (42°F) and a maximum of 15°C (58°F). The month is characterized by high humidity at 92%, along with significant precipitation, totaling around 100 mm (4.0 in) across 17 days. In contrast, July boasts a much warmer climate, with a minimum temperature of 8°C (46°F) and an average of 19°C (66°F), reaching highs of up to 39°C (103°F). The humidity is also lower at 80% and the precipitation is less frequent, averaging 65 mm (2.6 in) over just 9 days. For more details on the warm summer conditions, you can check out Mons weather in July.

December and August present starkly contrasting weather conditions. In December, temperatures range from a chilly -4°C (25°F) at their lowest to a milder 15°C (58°F) at their peak, with an average temperature of around 5°C (42°F). The month is characterized by high humidity levels, reaching 92%, and considerable precipitation, with about 100 mm (4.0 in) falling over 17 days. In contrast, August boasts significantly warmer temperatures, with a minimum of 7°C (45°F) and a maximum soaring to 37°C (98°F), averaging 19°C (66°F). This summer month experiences lower humidity at 76% and slightly less precipitation, totaling 79 mm (3.1 in) over 13 days. For more information, you can check Mons weather in August.

December and September present quite contrasting weather patterns. In December, temperatures range from a chilly minimum of -4°C (25°F) to a mild maximum of 15°C (58°F), with an average of 5°C (42°F). The month is marked by higher precipitation of 100 mm (4.0 in) over 17 days, and humidity levels soar to 92%. In contrast, September boasts significantly warmer conditions, with temperatures ranging from a minimum of 3°C (37°F) to a sweltering maximum of 32°C (91°F) and an average of 15°C (60°F). Precipitation is notably lighter at 53 mm (2.1 in) across just 9 days, and the humidity is slightly lower at 82%. For a detailed look at September's weather, you can visit Mons weather in September.

In December, the weather becomes notably colder, with average temperatures ranging from a frigid -4°C (25°F) to a relatively mild maximum of 15°C (58°F), compared to October's more temperate averages, which range from a minimum of 1°C (34°F) and peak at 25°C (76°F). Additionally, December sees increased precipitation, totaling about 100 mm (4.0 in) over 17 days, while October experiences less rainfall at 78 mm (3.1 in) across 14 days. Humidity also rises in December, reaching a high of 92% compared to October's 89%. For more detailed weather insights, you can check Mons weather in October.

When comparing the weather in December to that of November, notable differences emerge. December experiences slightly colder temperatures, with a minimum of -4°C (25°F) compared to November's minimum of -2°C (29°F). The average temperature in December is 5°C (42°F), while November is a bit warmer at 7°C (45°F). Additionally, December sees more precipitation, totaling 100 mm (4.0 in) over 17 days, compared to November's 60 mm (2.4 in) over 11 days. Both months share a high humidity level of 92%, creating a damp atmosphere throughout. For further details on November's weather, you can visit Mons weather in November.

Compare Mons's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Mons

As December settles over Mons, the weather takes on a distinctly chillier demeanor compared to other months. The average temperatures dip, creating a crisp atmosphere, while the increased rainfall—spanning nearly half the month—adds to the overall dampness, resulting in a high humidity level. This combination of cool air and wet conditions marks a clear transition into winter, contrasting sharply with the more temperate and drier months that preceded it. For a deeper understanding of Mons' climate throughout the year, explore more at Mons Climate.