Look up at the sturdy, multi-story brick and concrete building with its flat roof, marked by a slender metal weather mast pointing up toward the sky.
We just stepped away from the sprawling green paths of Valentino Park, and right here at the University of Turin, we find the perfect spot to see how a city of kings grew into a modern testing ground for natural science. Up on the roof of the Physics Department sits the Turin Meteorological Station Physics of the Atmosphere.
This station was activated in 1991 by Professor Arnaldo Longhetto. He was a deeply cultured, quietly ironic man who had a true passion for the skies. Longhetto fought for decades to revive the study of atmospheric physics here in Turin, bringing a hands-on, experimental spirit to the university.
But the story of tracking Turin's skies actually has a wonderfully scrappy past. Right after the Second World War, scientists were evicted from their old historic observatory towers in the center of town. Desperate to keep their climate records going during the chaotic postwar years, the physicists got creative. They built a grossa capannina... a massive wooden structure resembling a giant, slatted birdcage... and they literally hung it out of a first-floor window. That precarious, dangling wooden box kept their climate monitoring alive until modern facilities could be built.
Today, the instruments on this roof serve a very specific, modern purpose. They measure the urban heat island effect. This is a scientific term for how densely packed buildings, asphalt streets, and human activity trap warmth, making the city center noticeably hotter than the surrounding countryside. Because this building sits right on the boundary between the dense urban grid and the open park, it is the perfect laboratory to watch the clash between human engineering and natural cooling.
You can see the city's power to change its own climate in the station's records. Back in February 1956, before the city expanded so heavily, a rural station nearby recorded a staggering minus twenty five degrees Celsius. The local rivers froze solid. But today, wrapped in the concrete blanket of the urban heat island, this rooftop station rarely records such extreme freezing temperatures, even during severe cold snaps. The city is literally warming itself.
Yet, nature still holds surprises. During the solar eclipse in August 1999, the moon blocked ninety percent of the sun over Turin. The station's sensitive instruments captured the exact moment the atmosphere responded to the sudden midday darkness. The temperature plummeted instantly, and the wind shifted, simulating a rapid, eerie plunge into night. It was a beautiful reminder that no matter how much we build, we still live under the command of the sky.
Behind all these fascinating insights is the quiet, daily labor of technicians and researchers... people who dedicate their lives to recovering and digitizing decades of weather data so we can understand our changing world.
Now, from the clear, open data of the skies, our exploration of Turin's scientific legacy is about to take a turn toward the shadows. Just a four-minute walk from here, we will arrive at the Cesare Lombroso Museum of Criminal Anthropology, where we will uncover a much darker, controversial chapter of scientific history. Let us keep walking.
