Japan Records First Official Cruelly Hot Day

The Japan Meteorological Agency recorded the nation's first official kokushobi, or cruelly hot day, on Tuesday as temperatures in multiple cities reached or exceeded 40 degrees Celsius. This new classification, introduced in April, marks a shift in meteorological reporting as extreme heat events become increasingly frequent across the country.

The cities of Gujo, Tajimi, and Toyota reached the 40-degree threshold, with Toyota recording a peak of 40.1 degrees Celsius. Data from 914 weather stations nationwide indicates that 278 locations registered temperatures above 35 degrees Celsius, categorized as extremely hot days. This thermal trend follows a long-term increase in average summer temperatures, which have risen by approximately 1.3 degrees Celsius over the past century.

The sustained heat is driving structural changes in public health, agriculture, and corporate policy. Government agencies report that heatstroke-related hospitalizations exceeded 100,000 in the previous year, prompting the restructuring of outdoor sporting events and the adoption of more casual office attire to mitigate electricity demand. Agricultural sectors are responding by transitioning to heat-tolerant crop varieties to maintain yields. Projections from Institute for Environmental Studies suggest that without significant emissions reductions, current outdoor activities may become untenable by the 2060s.