Summers across the midlatitudes, including most of North America and Europe, now last roughly 30 days longer than they did in the 1960s. Total summer heat accumulation is growing more than three times faster than it did during the 1961

Summers across the midlatitudes, including most of North America and Europe, now last roughly 30 days longer than they did in the 1960s. Total summer heat accumulation is growing more than three times faster than it did during the 1961–1990 baseline period.