Extreme heat across large tracts of the Northern Hemisphere raised fears for crops in China, fuelled forest fires in Portugal and Russia’s Far East, forced flight cancellations in the Southwest US, and melted tarmac on roads in Britain.
As Wednesday marked the summer solstice — the longest day of the year — forecasters said temperatures in Paris were expected to hit 37 Celsius (100 Fahrenheit), Madrid could see 38C.
Rounding up the record temperatures set in the past two months, the World Meteorological Organization (WMO) said the Earth was experiencing “another exceptionally warm year” and the heatwaves were unusually early.
“Parts of Europe, the Middle East, North Africa and the United States of America have seen extremely high May and June temperatures, with a number of records broken,” the WMO said late on Tuesday.
The trend seen during the past two months has put average monthly global temperatures among the highest ever recorded since data began to be collated in 1880.
Even before this month, US National Oceanic and Atmospheric Administration (NOAA) data showed Europe, the United States and Northeast Asia — including eastern China, Japan and South Korea — had experienced unusually warm weather between March and May.
The hot, dry weather is a major factor behind forest fires that have killed dozens of people in Portugal, while the Russian news agency Tass reported scores of forest fires, mostly in Siberia and the far east region of Irkutsk.
In the US Southwest, flights were cancelled mostly by regional airlines whose aircraft operate at a lower maximum temperature.
Solar power generation was expected to surge in Germany on Wednesday, with Eikon data showing a potential of 27,500 megawatt-hour (MWh) could be generated, compared with a seasonal norm of just 20,000 MWh.
The Climate Change Institute at the University of Maine recorded temperatures in the Northern Hemisphere were 0.44C (0.8F) above the norm on Tuesday, compared with a global average of 0.25C above usual.
A study published earlier this week found that nearly one in three of the world’s people were already exposed to potentially deadly heatwaves and predicted that number would rise to nearly half by the end of the century unless governments take steps to aggressively reduce climate-changing emissions.
“People are talking about the future when it comes to climate change, but what we found from this paper is that this is already happening … and this is obviously going to get a lot worse,” said Camilo Mora, geography professor at the University of Hawaii at Manoa and lead author of the study published in the Nature Climate Change journal.


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