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MNN Global · April 18, 2026 · 1 min read

Japan introduces new term for 40C-plus hot days

What happened: Japan has created a new word, 'kokushobi', to describe days with temperatures of 40C or higher following its hottest summer on record.

Why it matters:

  • Highlights the increasing frequency of extreme heat due to climate change
  • Affects public awareness and safety measures during severe heat events

MNN Take: The new term reflects a need to better communicate the severity of extreme heat as temperatures rise, helping people recognise and respond to dangerous weather conditions.

Sources: BBC World