2) 7-day average maximum temperatures over land in the rectangular box(5W-25E, 36-45N) covering the most affected region (fig1, middle). Using published peer-reviewed methods, we analysed how human-induced climate change altered the likelihood and intensity of 1) 18-day average maximum temperatures over the most affected regions in western US, Texas and northern Mexico (fig 1, top). Scientists from the World Weather Attribution initiative collaborated to assess to what extent human-induced climate change altered the likelihood and intensity of the extreme July heat in these three regions. In all three regions, demand for power spiked and negatively impacted a number of important crops, including olive oil in Spain and cotton in China. Large parts of the population in Italy and Spain and over 100 million people in Southern US are under heat alerts. Spain, Italy, Greece, Cyprus, Algeria, and China also reported heat deaths, as well as a large increase in hospitalisation due to heat related illnesses. In Mexico alone over 200 people died due to the heat. Several heat deaths have been confirmed in the US, including migrants on the US Mexican border. In the US, parts of Nevada, Colorado and New Mexico tied their all time high, parts of Arizona, Cayman Islands, highest ever night time temperatures in Phoenix Arizona which also had its record for longest time without falling below 90F/32.2C. In Europe, the hottest ever day in Catalunya was recorded and highest-ever records of daily minimum temperature were broken in other parts of Spain.
Records were also reached in many other weather stations in China and the all-China heat record was broken in Sanbao on the 16th of July. Temperatures exceeded 50C on the 16th of July in Death Valley in the US as well as in Northwest China ( CNN,2023 ). July 2023 saw extreme heatwaves in several parts of the Northern Hemisphere, including the Southwest of the US and Mexico, Southern Europe and China.
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