 In Switzerland, urban populations are more vulnerable to heat-related deaths than rural populations. This is due to a combination of environmental factors such as evolution and socio-economic factors such as poverty and lack of access to healthcare. Additionally, older people living in peer-urban or rural areas are at greater risk of cold-related deaths than those living in urban areas. This article was authored by Evan de Schriever, Dominic Roy, Antonio Gasparini and others.