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5/03/2026

Topic Reading-Vol.5122-5/3/2026

Dear MEL Topic Readers, 
Japan reveals new name for 40C-and-hotter days after blistering summer
Japan's summer is extremely humid, often 75%–90% humidity, due to warm, moist air masses from the Pacific Ocean and Southeast Asia, as well as a post-rainy season effect. Also, summer in cities is so intense because of concrete and air conditioning, which keeps temperatures high even during the night, the urban heat island effect. And it is becoming even hotter due to global warming. Last year, Japan experienced a record-breaking hot summer. Daytime temperatures exceeded 35 °C for 52 days in Kyoto and 25 days in Tokyo. The Japan Meteorological Agency, JMA, uses hot day terminologies, Extremely Hot Day for days of 35°C or above, Midsummer Day for 30°C or above, and Summer Day for 25°C or above. Now, to prepare for an even hotter summer, JMA added a new term, Cruelly Hot (Kokusho-bi), for days of 40°C or above. Though the new term won’t ease Japan’s already hot summer, it at least warns people how brutal the day is going to be. Japan’s weather news often advises people to turn on the air conditioning and stay indoors on Extremely Hot Days (35°C+). What will they say on Kokusho-bi?
Read the article and learn how Japan describes an unbearably hot summer day.

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