December 2025 in Luxemburg: A Mild and Sunny Month with Below-Average Rainfall
December 2025 brought notably mild conditions to the Belgian province of Luxemburg, with temperatures running slightly above normal throughout the month. The average temperature reached 4.6 degrees Celsius, exceeding the seasonal normal of 4.0 degrees by 0.6 degrees. This modest warming trend was particularly evident during the first half of the month, when Rendeux recorded the month's highest temperature of 13.6 degrees on December 9th. However, as the year drew to a close, winter reasserted itself, with Rouvroy experiencing the coldest conditions on New Year's Eve, dropping to minus 5.8 degrees Celsius.
Precipitation patterns during December were notably drier than usual, with significant implications for the region's water balance. The province received only 44.6 millimeters of rainfall on average, representing a substantial 50 percent deficit compared to the normal December precipitation of 89.2 millimeters. Despite this overall dryness, Bouillon recorded the wettest single day on December 6th, when 19.9 millimeters fell in just 24 hours. Over the entire month, Bouillon emerged as the wettest location in the province, accumulating 68.8 millimeters of total precipitation.
One of December's most striking features was the exceptional sunshine, which significantly exceeded seasonal expectations. The province enjoyed 114 hours of sunshine, representing a remarkable 40 percent increase above the normal value of 81.5 hours. This abundance of clear skies contributed to the generally pleasant conditions experienced throughout the month, despite the cool temperatures typical of the season.
The combination of mild temperatures, reduced rainfall, and abundant sunshine created an unusual December weather pattern for Luxemburg. While the month remained cool enough for occasional frost, particularly toward month's end, the overall character was more reminiscent of autumn than a typical winter month. The significant precipitation deficit may have implications for groundwater recharge and winter water supplies in the region.