The Trend Is Not Subtle

MeteoLux published their July report this week, and the numbers are blunt. July 2026 was the second sunniest July ever recorded in Luxembourg, with 361 hours of sunshine. Only July 2022 had more, at 377 hours.

Here is the part that should make you pause: the five sunniest Julys since records began in 1947 have all occurred since 2005. Not spread across the decades. Not scattered evenly through the dataset. All of them, in the last twenty years.

The average temperature at Findel came in at 21.2 degrees, more than two degrees above the reference average. Rainfall since April has been 150 litres per square metre, compared to the normal 270 to 280. That is roughly half.

Luca Mathias, a meteorologist at MeteoLux, explained it plainly in an interview with RTL. A high-pressure system over Western and Central Europe drove the heat. Even when air pressure dipped, stability at altitude meant air masses dried out and warmed up, breaking up cloud cover and holding back rainfall.

Mathias was direct about the cause. Looking at 20 to 30 years of statistics, he said, the trend is definitive. Summers are getting warmer, and so are the other seasons. It can already be attributed to climate change, and the likelihood of summers like this one will keep increasing.

Not every summer will be exceptional, he noted. But the direction is clear. Luxembourg will increasingly need to prepare for extreme events: heatwaves, prolonged drought, and everything that follows from them.

Yesterday I wrote about Cattenom shutting down a reactor because the Moselle was too low to cool it. Today the weather agency is confirming the pattern that made it happen. These are not separate stories. They are the same story, told from different angles.

The data has been telling us this for years. At this point, the trend is not subtle. It is not even slow. It is just the weather now.