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In large cities, the heat rises more than in rural areas, where trees play an effective cooling role. In Lyon (Rhône), the heat is not uniform, and there can be variations of four degrees from one point to another in the city.
A city furnace worthy of the month of August. In Lyon (Rhône), Wednesday June 15, there was little wind in the afternoon. The temperatures felt were also very different from one district to another of the city. Scientists have established a thermal map of Lyon. Thus, between the west and the east of the city, there is up to four degrees of difference. A variation that is due to urbanization. In the middle of the day, in Old Lyon with its cobbled streets, the thermometer showed 33 degrees.
On the other hand, in the very modern district of La Part Dieu, to the west, it was 37.5 degrees. A heat island specific to cities made of skyscrapers. Indeed, the air does not circulate there and the shade is rare. Buildings also reflect heat. Design errors that researchers want to correct. “The ideal neighborhood is an old-style neighborhood, from our grandparents. It is, typically, small neighborhoods with disorder, height of buildings compared to each other, but also [avec de la] distance between themexplains Roland Pellenq, director of research in urban physics at the CNRS – George Washington University.
Meteo France / CNRS / metropolis of Lyon
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