December Weather in Leuven, Belgium

Last updated: August 21, 2025

December in Leuven, Belgium is characterized by a chilly atmosphere, where temperatures typically range from a maximum of 15°C (60°F) to a minimum of -5°C (23°F), with an average around 6°C (42°F). The month experiences a significant amount of precipitation, totaling 91 mm (3.6 in) over approximately 16 days, giving rise to a notably humid environment with levels reaching 92%. This combination of cool temperatures and frequent rain creates a picturesque, albeit damp, winter backdrop for the historic city.

December Temperature in Leuven

In Leuven, Belgium, December ushers in the embrace of winter, with temperatures generally ranging from a brisk -5°C (23°F) at night to a mild 15°C (60°F) during the day. As the month progresses, residents experience an average temperature of 6°C (42°F), signaling a transition from the chilly autumn months. Compared to the preceding months, December’s cool nights and moderate daytime warmth prepare the city for the festive season, creating an intriguing contrast to the earlier winter chill of January and February. With temperatures steadily dipping, December serves as a reminder of the approaching colder weather, while still allowing for pleasant daytime excursions wrapped in cozy layers.

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

The chart illustrates December temperature patterns in Leuven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Leuven, 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).
JanFebMarAprMayJunJulAugSepOctNovDec394245505765676660544542
Data source: Temperature data for Leuven 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 Leuven

December in Leuven, Belgium, ushers in a significant uptick in precipitation, with 91 mm (3.6 in) cascading down over 16 days. This makes December the wettest month of the year, reinforcing the trend of increasing rainfall as winter sets in. Compared to the preceding months, December's precipitation not only surpasses that of November, which recorded 54 mm (2.1 in) over 11 days, but also shows a marked increase from the drier months of spring and early autumn. With the combination of longer rainy periods and higher total amounts, this month reminds residents that the holiday season often comes with a splash of winter weather.

December Precipitation Trends in Leuven

The chart displays monthly precipitation patterns in Leuven, 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 Leuven, December typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec636970346068757653785492
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Leuven

In December, Leuven, Belgium, experiences a continuation of high humidity, with levels reaching 92%, consistent with the trend of the preceding months. After the gradual drop in humidity from the early summer lows of 80% in July to 76% in August, a notable rise is seen as the year approaches its end. October and November marked humidity levels of 89% and 92% respectively, reflecting the onset of winter conditions. This notable fluctuation demonstrates how seasonal transitions heavily influence moisture levels in the air, leaving December residents enveloped in a crisp yet humid atmosphere that characterizes Belgium’s cold winter months.

December Average Humidity in Leuven

This chart illustrates the average monthly humidity levels in Leuven, 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 Leuven 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 Leuven

As December rolls into Leuven, Belgium, residents can expect a low UV Index of 1, indicating minimal sun exposure risk and an extended burn time of 45 minutes. This comfortably contrasts with the high UV levels experienced during the summer months, particularly in June and July, where the index peaked at 8, demanding vigilant sun protection strategies with burn times slashed to just 15 minutes. Notably, the winter months reveal a consistent pattern of decreased UV exposure, making December a time for enjoying outdoor activities with far less concern for skin damage. For more detailed UV forecasts and insights, you can explore Leuven UV Index.

Maximum UV Index Levels in Leuven for December

The chart shows the monthly maximum UV Index (UVI) for Leuven 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 Leuven typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Leuven 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 Leuven

December in Leuven, Belgium, brings a gentle retreat of daylight, with sunshine hours dipping to 134. This month's sunshine serves as a prelude to the winter months, where the golden rays are notably fewer compared to the vibrant spring and summer seasons, peaking in July with 403 hours. As the year unfolds, we see a consistent rise in sunshine, especially from January's 119 hours to May's 392 hours, highlighting Leuven's transition from the cold, dim days of winter to the lively brightness of summer. While December’s shorter days may hint at the cold darkness ahead, they also remind us of the warmth and vibrancy that comes with the longer, sun-filled days of the following year.

Monthly Sunshine Duration in Leuven: December Highlighted

The December sunshine duration represents the total number of hours Leuven 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.
JanFebMarAprMayJunJulAugSepOctNovDec119h199h269h341h392h390h403h377h315h235h186h134h
Data source: Leuven December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Leuven During December

In Leuven, Belgium, the likelihood of sunny weather takes a notable dip as December rolls in, with only a 17% chance of sunshine. This decrease contrasts sharply with the more promising figures seen in the spring months, where sunlight appears more frequently—47% in April and 39% in March—as the days gradually lengthen and warm. While December offers cozy festivities and a wintery charm, it is decidedly one of the cloudier months, mirroring the trend of gradually diminishing sunlight from autumn, which sits at 24% in November. As winter settles, residents and visitors alike may find themselves yearning for the brighter days that the early months of the year promise.

Percentage of Sunny Days in December in Leuven

The chart illustrates the percentage of sunny days in Leuven 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 Leuven experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec10%31%39%47%32%34%33%31%34%30%24%17%
Data source: Leuven December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Leuven in December

As December arrives in Leuven, Belgium, the days grow noticeably shorter, offering just 7 hours of daylight—a stark contrast to the vibrant 16 hours of summer sunlight in June. This month marks the annual low point in daylight duration, as nature begins its quiet slumber, reminiscent of the winter solstice. While January and November also present limited daylight at 8 hours, it’s December that feels particularly reflective, as the early sunsets invite cozy evenings indoors. As the year draws to a close, the gradual increase of daylight we anticipate in January hints at the brighter days to come, transitioning us from winter’s embrace back toward spring’s renewal.

Average Daylight Hours in Leuven for December

The chart illustrates the variation in daylight duration in Leuven throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 28m10h 1m11h 55m13h 51m15h 33m16h 26m15h 58m14h 27m12h 34m10h 38m8h 54m7h 59m
Data source: Leuven daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Leuven

In Leuven, Belgium, the December wind brings a refreshing chill, with an average speed of 3.9 m/s (9 mph), rounding off the year with a gentle but notable breeze. Compared to the previous months, December's wind speed is a slight uptick from November's 3.2 m/s, indicating a return to brisker conditions as winter settles in. Interestingly, the city's wind patterns throughout the year reveal a trend of fluctuating speeds, with January and October also showcasing stronger winds at 4.2 m/s and 4.1 m/s, respectively. As Leuven prepares for the winter months ahead, the December winds serve as a reminder of the seasonal changes that shape the city's vibrant atmosphere.

Average December Wind Speed in Leuven

The chart displays monthly wind speed patterns in Leuven, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.24.33.83.24.12.73.23.22.84.13.23.9 m/s
Data source: Leuven December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Leuven Compares to Other Months

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

December and January exhibit notable differences in weather patterns. In December, temperatures range from a minimum of -5°C (23°F) to a maximum of 15°C (60°F), with an average of 6°C (42°F). The month experiences considerable precipitation, totaling 91 mm (3.6 in) over 16 days, accompanied by high humidity levels at 92%. In contrast, January sees a slight drop in temperatures, with a minimum of -7°C (20°F) and a maximum of 14°C (58°F), averaging around 4°C (40°F). Precipitation also decreases to 63 mm (2.5 in) over 12 days, while humidity remains similar at 91%. For more detailed information, you can check Leuven weather in January.

December and February present distinct weather patterns, with December experiencing slightly milder temperatures and higher humidity. In December, temperatures range from a minimum of -5°C (23°F) to a maximum of 15°C (60°F), with an average of 6°C (42°F) and a total precipitation of 91 mm (3.6 in) over 16 days. In contrast, February is colder, with temperatures dipping to a minimum of -8°C (17°F) and peaking at 19°C (66°F), while the average remains around 5°C (42°F). Precipitation is also less in February, totaling 69 mm (2.7 in) over 12 days. Humidity is marginally lower in February at 89%, compared to December's higher 92%. For more detailed insights, check out Leuven weather in February.

In December, temperatures typically range from a chilly minimum of -5°C (23°F) to a maximum of 15°C (60°F), with an average temperature of 6°C (42°F). The month sees significant precipitation, averaging 91 mm (3.6 in) over about 16 days, and a high humidity level of 92%. In contrast, March experiences slightly milder temperatures, with a minimum of -8°C (19°F) and a maximum of 23°C (74°F), averaging 7°C (46°F). Precipitation decreases to 70 mm (2.8 in) spread across 14 days, and humidity levels are slightly lower at 87%. For more details, visit Leuven weather in March.

December and April present contrasting weather patterns that highlight the transition from winter to spring. In December, temperatures range from a chilly -5°C (23°F) to a mild 15°C (60°F), with an average of 6°C (42°F). This month brings a substantial 91 mm (3.6 in) of precipitation over 16 days and high humidity at 92%, creating a damp and cold atmosphere. In contrast, April features a slightly warmer climate, with temperatures ranging from -4°C (26°F) to a pleasant 28°C (82°F) and an average of 10°C (51°F). With only 34 mm (1.3 in) of precipitation spread over 8 days and reduced humidity at 85%, April offers a much drier and more enjoyable atmosphere for outdoor activities. For more details on April weather, you can visit Leuven weather in April.

In December, temperatures can drop to a chilly minimum of -5°C (23°F), with an average of 6°C (42°F) and a maximum reaching 15°C (60°F). The month is characterized by high humidity at 92% and significant precipitation, totaling 91 mm (3.6 in) over 16 rainy days. In contrast, May brings much milder conditions with a minimum temperature of 1°C (34°F), an average of 14°C (57°F), and highs soaring up to 32°C (89°F). While May still experiences some rainfall, it is significantly less, with 60 mm (2.3 in) across 12 days, and the humidity lowers to 82%. For more details on weather trends, check Leuven weather in May.

December and June in Leuven present stark contrasts in weather. December is characterized by chilly temperatures, with a minimum of -5°C (23°F) and an average of 6°C (42°F), creating a cold and often damp environment, as evidenced by 91 mm of precipitation over 16 days and high humidity at 92%. In contrast, June enjoys much milder and warmer weather, with temperatures ranging from a minimum of 7°C (46°F) to a pleasant average of 19°C (66°F), peaking at 34°C (93°F). There’s less rainfall during this month, totaling 68 mm over 10 days, and a slightly lower humidity of 82%. Such differences highlight the transition from wintery cold to the warmth of early summer, making June a much more favorable time for outdoor activities in Leuven. For more details, check out Leuven weather in June.

December and July present strikingly different weather patterns. In December, temperatures can drop as low as -5°C (23°F), with an average of 6°C (42°F) and a maximum of 15°C (60°F). This chilly month also sees considerable rainfall, with about 91 mm (3.6 in) spread across 16 days and high humidity levels of 92%. In contrast, July boasts much warmer conditions, characterized by a minimum temperature of 8°C (47°F), an average of 19°C (67°F), and soaring maximums reaching up to 40°C (104°F). Precipitation is less frequent in July, with around 75 mm (2.9 in) falling over just 10 days, and the humidity is slightly lower at 80%. For a closer look at July weather in Leuven, you can visit Leuven weather in July.

December and August present stark contrasts in weather, reflecting the shift from winter to summer. In December, temperatures range from a chilly -5°C (23°F) at night to a mild 15°C (60°F) during the day, with an average of 6°C (42°F). Precipitation is common, occurring on about 16 days and contributing to a high humidity level of 92%. Conversely, August boasts warmer temperatures, with a minimum of 8°C (46°F), an average of 19°C (67°F), and highs reaching a sultry 35°C (96°F). Although it experiences slightly less precipitation at 76 mm (3.0 in) over 14 days, humidity is lower at 76%. For a detailed look at the weather in August, visit Leuven weather in August.

In comparing the weather between December and September, it's clear that December is significantly cooler, with temperatures ranging from a minimum of -5°C (23°F) to an average of 6°C (42°F) and maximums reaching only 15°C (60°F). In contrast, September enjoys a more temperate range, with minimums of 3°C (38°F) and maximums soaring up to 34°C (93°F), leading to a much warmer average of 16°C (60°F). Additionally, December receives more precipitation, totaling 91 mm (3.6 in) over 16 days, compared to September's 53 mm (2.1 in) over 10 days. Humidity levels also differ, with December at 92% and September at a slightly lower 82%. For more details about September weather, you can visit Leuven weather in September.

When comparing the weather in December to October, significant differences emerge. December experiences colder temperatures, with a minimum of -5°C (23°F) and an average of 6°C (42°F), compared to October's milder conditions, which range from a minimum of 2°C (36°F) and an average of 12°C (55°F). While both months see a fair amount of precipitation, December has slightly more, with 91 mm (3.6 in) falling over 16 days, versus October's 78 mm (3.1 in) over 12 days. Additionally, December has a higher humidity level at 92%, compared to October's 89%, contributing to a noticeably chillier and damp atmosphere. For more detailed insights, check out Leuven weather in October.

December weather is generally colder than November, with minimum temperatures dropping to -5°C (23°F) compared to November's low of -2°C (28°F). The average temperatures also see a slight decline, with December averaging 6°C (42°F) versus November's 7°C (46°F). While both months experience high humidity levels of 92%, December sees increased precipitation, receiving 91 mm (3.6 in) over 16 days, compared to November's 54 mm (2.1 in) over 11 days. For a more detailed look at November's weather, you can refer to Leuven weather in November.

Compare Leuven's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Leuven

As December settles in, Leuven transforms into a winter wonderland, characterized by its crisp temperatures and slightly increased humidity. While other months may experience more moderate weather, December’s average dips pleasantly to 6°C, creating a cozy atmosphere perfect for holiday festivities. Rainfall increases, with 16 days of precipitation contributing to the month’s distinct charm, making it essential for visitors to pack accordingly. This unique blend of chill and cheer makes December a special time to explore the city’s rich history and vibrant culture, adding a magical touch that sets it apart from the rest of the year. For more insights on the weather throughout the year, visit Leuven Climate.