With the Plateau facing 35 degrees on Thursday, Yverdon-les-Bains has installed 15 sensors to work out how hot its own streets really get.
The "Yverdon les tropiques" project, run with the HEIG-VD engineering school, has produced a first-ever heat map after a year of readings.
Place Pestalozzi tops the list at 37.67 degrees; the lakeshore is cool by day but traps heat overnight.
The city plans to use the data to guide planting, break up asphalt, and cool the urban core. Yverdon hopes to become a model for other towns facing worsening summer heat.
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