In 2017, land areas recorded more than 60 days of extreme daytime heat worldwide, nearly double the 1961-1990 average.
The State of the Climate in 2017 report includes a summary of the devastation in Puerto Rico from Hurricane María, describing damage so widespread and severe that thousands of residents of the Caribbean island moved to the U.S. mainland in the aftermath.
But basin-wide quiet periods favor rapid intensification of U.S. landfalling hurricanes.
Models suggest 2016's extreme warmth may be the Arctic's new normal within a decade.
Oklahoma tornado drought to start 2018
May 4, 2018