December Weather in Spa, Belgium

Last updated: August 21, 2025

December in Spa, Belgium is characterized by a chill in the air, with maximum temperatures reaching 14°C (57°F) and average values around 4°C (39°F). As the month unfolds, residents and visitors alike can expect minimum temperatures dipping to -5°C (23°F), creating a brisk winter atmosphere. Rainfall is a notable feature, with 139 mm (5.5 in) of precipitation spread across 21 days, resulting in a humid environment with humidity levels hovering around a remarkable 92%. This combination of cool temperatures and substantial rainfall paints a quintessentially wintry picture of Spa, perfect for cozy indoor pursuits or invigorating outdoor adventures.

December Temperature in Spa

In December, Spa, Belgium experiences a notable shift as temperatures dip, heralding the arrival of winter. With a minimum temperature of -5°C (23°F) and an average of 4°C (39°F), the chill in the air is unmistakable, while the maximums peak at 14°C (57°F). This contrast creates a crisp atmosphere, setting the scene for cozy gatherings and festive cheer. Compared to the milder months preceding it, December’s chill marks a clear transition, inviting locals and visitors alike to wrap up warm and embrace the seasonal charm that this historic spa town offers. As the year ends, the cool climate serves as a refreshing backdrop for winter activities and holiday celebrations.

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

The chart illustrates December temperature patterns in Spa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Spa, 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).
JanFebMarAprMayJunJulAugSepOctNovDec363943485463646457514339
Data source: Temperature data for Spa generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Spa

December in Spa, Belgium, is characterized by a noticeable increase in precipitation, with a substantial total of 139 mm (5.5 in) recorded over 21 days. This surge marks a stark contrast to the previous months, as December's rainfall not only is the highest of the year but also signifies the onset of winter's wet embrace. The combination of increased days of rain and elevated precipitation levels indicates a shift towards the wetter climate typical of late fall and early winter. As the year draws to a close, Spa transforms into a cozy retreat, where the rhythmic patter of rain creates a serene atmosphere, making it a picturesque time to experience the charm of this historic town.

December Precipitation Trends in Spa

The chart displays monthly precipitation patterns in Spa, 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 Spa, December typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec100911084581919783749671139
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Spa

In Spa, Belgium, December marks a notable peak in humidity, reaching 92%, which is the highest level recorded throughout the year. This month stands at the end of a gradual rise from the lower humidity values observed mid-year, where July and August dipped to 72% and 71%, respectively. An upward trend emerges as the year progresses, with humidity levels climbing significantly in the fall. The late-year months of October and November showcase humidity levels at 88% and 91%, respectively, setting the stage for December’s high. This consistent increase highlights Spa’s moist winter climate, offering a fresh reminder of the region’s cherished natural springs and lush landscapes that thrive in these humid conditions.

December Average Humidity in Spa

This chart illustrates the average monthly humidity levels in Spa, 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 Spa is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%87%84%77%74%72%71%81%88%91%92%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Spa

In December, Spa, Belgium experiences a notably low UV Index of 1, categorized as low exposure, allowing for a comfortable burn time of 45 minutes. This marks the conclusion of a gradual downward trend in UV levels since the peak of 8 during the summer months of May through July. As the year transitions into winter, the UV Index consistently decreases, providing a safe environment for outdoor activities without the heightened risks seen earlier in the year. With cold weather setting in, sun protection becomes less of a concern, but residents and visitors can still enjoy the crisp December air while keeping the UV levels in mind. For more details on monthly variations, check out Spa UV Index.

Maximum UV Index Levels in Spa for December

The chart shows the monthly maximum UV Index (UVI) for Spa 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 Spa typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234588876421
Data source: Spa 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 Spa

In the picturesque town of Spa, Belgium, December ushers in a gentle decline in sunshine, with 124 hours illuminating the winter days. As the year progresses, sunshine steadily increases, peaking in the vibrant months of May through July, where residents bask in a delightful 396 to 407 hours of bright rays. The gradual ascent from early spring's 266 hours to summer's height reflects the emerging vibrancy of the seasons. However, as autumn approaches, sunlight fades, leaving behind a tapestry of shorter days, culminating in December’s reflective glow. This consistent pattern highlights the ebb and flow of nature's light throughout the year, inviting residents and visitors alike to embrace the cozy charm of winter in Spa.

Monthly Sunshine Duration in Spa: December Highlighted

The December sunshine duration represents the total number of hours Spa 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.
JanFebMarAprMayJunJulAugSepOctNovDec112h199h266h346h396h405h407h382h319h240h183h124h
Data source: Spa December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Spa During December

In Spa, Belgium, the likelihood of sunny weather takes a notable dip in December, with only a 14% chance of sunshine. This figure is a significant drop from the relatively brighter months, with March and April showcasing the highest probabilities at 39% and 43%, respectively. As the year winds down, the chances of encountering sunny days diminish markedly, reflecting the general trend of decreasing sunlight as winter approaches. By comparing December's stats to the sunnier spells of spring and early summer, it's clear that if you're hoping for a bright day this month, you'd be wise to keep your expectations in check.

Percentage of Sunny Days in December in Spa

The chart illustrates the percentage of sunny days in Spa 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 Spa experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec7%32%40%43%30%31%32%28%38%28%22%14%
Data source: Spa December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Spa in December

In Spa, Belgium, December marks the return of shorter days, where daylight lasts only 8 hours, mirroring the earlier months of January and November. As we move through the year, a noticeable trend emerges: daylight duration gradually increases with the approach of spring, reaching a peak of 16 hours in June. This gradual shift brings longer days and vibrant colors to the landscape, culminating in the lushness of summer. However, as autumn falls, daylight begins to wane again, leading us back into the cozy embrace of shorter days by winter. December's brief daylight serves as a reminder of nature’s rhythm, setting the stage for the renewal that follows with the onset of longer days in the new year.

Average Daylight Hours in Spa for December

The chart illustrates the variation in daylight duration in Spa throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 31m10h 2m11h 55m13h 50m15h 30m16h 22m15h 55m14h 25m12h 34m10h 39m8h 57m8h 2m
Data source: Spa daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Spa

As December arrives in Spa, Belgium, the wind whispers a narrative of seasonal transition. With an average wind speed of 4.2 m/s (9 mph), there's a gentle increase compared to November's 3.3 m/s. This trend mirrors the fluctuating dance of wind speeds throughout the year, showing resilience in the colder months. While the summer saw its lowest winds in June at 2.8 m/s, December's breezes are notably stronger, offering a brisk, refreshing touch that invigorates the winter landscape. The winds, though not violent, carry the essence of the season, hinting at a month filled with both calm introspection and the promise of the festive spirit.

Average December Wind Speed in Spa

The chart displays monthly wind speed patterns in Spa, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.44.74.13.34.52.83.43.52.84.53.34.2 m/s
Data source: Spa December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Spa Compares to Other Months

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

December typically presents milder temperatures compared to January, with averages around 4°C (39°F) and a maximum of 14°C (57°F), while January sees a drop in temperatures, averaging 2°C (36°F) and peaking at just 12°C (54°F). While December is characterized by frequent precipitation over 21 days, totaling 139 mm (5.5 in), January has a slightly drier pattern with 100 mm (3.9 in) of rain over 15 days. Humidity levels remain high in both months, with December slightly higher at 92% compared to January's 91%. For more detailed insights on the weather in January, you can check Spa weather in January.

December weather tends to be milder, with average temperatures ranging from a minimum of -5°C (23°F) to a maximum of 14°C (57°F). It sees considerable precipitation, accumulating to 139 mm (5.5 in) over 21 days, coupled with high humidity levels of 92%. In contrast, February experiences colder temperatures, dipping to a minimum of -11°C (13°F) while achieving a maximum of 20°C (68°F), reflecting a more variable climate despite having a similar average temperature of 4°C (39°F). The month sees less precipitation at 91 mm (3.6 in) over 13 days and slightly lower humidity at 90%. For a more detailed look into the February climate, you can visit Spa weather in February.

December and March present contrasting weather patterns. In December, temperatures generally range from a chilly -5°C (23°F) at night to an average of 4°C (39°F) during the day, peaking at a mild 14°C (57°F). The month experiences significant precipitation, with 139 mm (5.5 in) falling over 21 days, and the humidity remains high at 92%. In stark contrast, March sees a wider temperature range with nighttime lows dipping to -12°C (10°F) but daytime averages reaching 6°C (43°F) and a warm maximum of 22°C (72°F). Precipitation is also slightly lower at 108 mm (4.2 in) over 16 days, accompanied by a humidity level of 87%. For those interested in specifics about the weather conditions during this month, more details can be found here.

December weather is characterized by chilly temperatures, with a minimum dipping to -5°C (23°F) and an average of just 4°C (39°F), while highs reach 14°C (57°F). The month is quite wet, experiencing 139 mm (5.5 in) of precipitation over 21 days, coupled with high humidity levels at 92%. In contrast, April offers a significant shift, featuring milder conditions with temperatures ranging from a minimum of -4°C (24°F) to an average of 9°C (48°F), peaking at 26°C (79°F). Precipitation drops considerably to 45 mm (1.8 in) over only 9 days, and humidity decreases to 84%. For a detailed look at what to expect, check out Spa weather in April.

In December, the weather is notably colder, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 14°C (57°F). The month experiences significant precipitation, averaging 139 mm (5.5 in) over 21 days and a high humidity level of 92%. In contrast, May brings milder temperatures, with a minimum of -1°C (31°F) and a maximum soaring to 30°C (87°F), alongside a reduction in rainfall to 81 mm (3.2 in) across 15 days and lower humidity at 77%. For more details on the pleasant weather conditions typical of Spa in May, you can refer to Spa weather in May.

December and June present contrasting weather conditions that significantly influence daily life. In December, temperatures range from a chilly -5°C (23°F) to a moderate 14°C (57°F), with an average of around 4°C (39°F). The month is characterized by high humidity at 92% and frequent precipitation, occurring on 21 days and totaling 139 mm (5.5 in). In contrast, June boasts much warmer temperatures, with minimums of 6°C (43°F) and maximums reaching up to 33°C (91°F), leading to an average of 17°C (63°F). This month experiences less precipitation, accumulating 91 mm (3.6 in) over just 13 rainy days and a noticeable drop in humidity to 74%. For a detailed overview of June weather, you can visit Spa weather in June.

December and July present stark contrasts in weather. December experiences colder temperatures, with lows dipping to -5°C (23°F) and an average of 4°C (39°F), while July boasts much warmer conditions, featuring a minimum of 7°C (44°F) and an average of 18°C (64°F), peaking at a scorching 38°C (101°F). Precipitation is more frequent in December, with rain occurring over 21 days and totaling 139 mm (5.5 in), compared to July's 12 days and 97 mm (3.8 in). Additionally, the humidity is significantly higher in December at 92%, while July’s humidity is a more comfortable 72%. For more details on July weather, you can check Spa weather in July.

December and August present stark contrasts in weather characteristics. December experiences a chilly range, with temperatures dipping as low as -5°C (23°F) and averaging around 4°C (39°F), while August boasts a much warmer climate, with temperatures ranging from a minimum of 6°C (42°F) to a comfortable maximum of 35°C (95°F). Precipitation is more frequent in December, occurring on 21 days and totaling 139 mm (5.5 in), compared to August’s 83 mm (3.3 in) over 16 days. Additionally, the humidity in December is significantly higher at 92%, creating a damp and cold atmosphere, whereas August enjoys a lower humidity level of 71%, contributing to a more pleasant summer experience. For a detailed look at Spa's climate during this month, check out Spa weather in August.

December and September present notably contrasting weather conditions. In December, temperatures range from a chilly -5°C (23°F) at their lowest to a mild 14°C (57°F) at their peak, with an average of about 4°C (39°F). Rainfall in December is substantial, totaling 139 mm (5.5 in) over 21 days, and the humidity reaches a high of 92%, creating a damp atmosphere. In contrast, September showcases a much warmer climate, with temperatures starting at a minimum of 2°C (36°F) and soaring to 32°C (90°F), averaging around 14°C (58°F). Precipitation is also less frequent in September, amounting to 74 mm (2.9 in) over just 10 days, with an average humidity of 81%. For more details on the September climate, you can visit Spa weather in September.

In December, the weather takes a notable turn towards winter, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 14°C (57°F) and an average of 4°C (39°F). In contrast, October offers a milder climate, with temperatures varying from 1°C (33°F) at night to a pleasant 24°C (75°F) during the day, averaging 11°C (52°F). Additionally, December sees higher precipitation levels of 139 mm (5.5 in) over 21 days, compared to October's 96 mm (3.8 in) across 15 days, and slightly higher humidity levels at 92% versus October's 88%. For more details about October weather, check out Spa weather in October.

Comparing the weather in December and November reveals some notable differences. December typically experiences slightly colder temperatures, with an average of 4°C (39°F), compared to November's average of 6°C (43°F). The maximum temperatures in December reach up to 14°C (57°F), which is lower than November's peak of 18°C (64°F). Additionally, December sees significantly higher precipitation, totaling 139 mm (5.5 in) over 21 days, while November receives only 71 mm (2.8 in) across 12 days. Humidity levels remain similar, with December at 92% and November at 91%. For more detailed insights about the weather in November, you can check Spa weather in November.

Compare Spa's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Spa

December in Spa presents a distinct shift in weather, characterized by its cooler temperatures and higher humidity levels compared to other months. With an average of 4°C (39°F), it’s a time when the cold truly sets in, often accompanied by frequent precipitation across 21 days—adding up to a notable 139 mm (5.5 in) for the month. The lush greenery of the region is glistening under a dew-like layer, thanks to the 92% humidity, creating a unique winter atmosphere. As the year winds down, December invites a cozy retreat experience, making it essential to prepare for the chill that defines this month. For more detailed insights into the seasonal trends and weather patterns, visit Spa Climate.