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Summer in the Northern Hemisphere keeps getting hotter

The average day in many locations is now hotter, and extremely hot days are becoming more likely. The share of the Northern Hemisphere that experiences an unusually hot summer has increased to 15.0 percent, from 0.2 percent, since 1980.

A small shift in the average can hide dramatic changes at the extremes.
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To read the report, see “Climate risk and response: Physical hazards and socioeconomic impacts,” January 16, 2020.