Temperatures in cities are often higher than in rural areas. This effect is called an urban heat island. It leads to an increased risk of heat stress for the urban population in the summer months.
NCCS-News | 15.06.2022 | MeteoSwiss
To better estimate future climatic conditions in cities, the current Swiss climate scenarios (CH2018) were extended with heat indicators for selected Swiss cities. For the city centers of Basel, Bern, Geneva, Lausanne and Zurich, the indicators tropical nights, summer days and hot days are available via the CH2018 web atlas under "Indicators at stations".