MeteoSwiss says this May is the fourth hottest in Switzerland since records began in 1864, at 1.8°C above average.

Keystone / Claudio Thoma

Europe is sweltering under unseasonal May heat, with temperatures exceeding 30° degrees Celsius (86° Fahrenheit) in several countries and records tumbling. Swiss climatologist Sonia Seneviratne warns that the heatwave season is expanding, underscoring growing climate risks.

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