It’S No Longer Your Imagination. Summers Are Becoming Warmer.

Practically, that means most summers today are either hot or extremely hot compared to the mid-20th century.
Between 2005 and 2015, two-thirds of summers were in the hot category, while nearly 15 percent were in a new category: extremely hot.
To create the bell curves, Dr. Hansen and two colleagues compared actual summer temperatures for each decade since the 1980s to a fixed baseline average.
During the base period, 1951 to 1980, about a third of summers across the Northern Hemisphere were in what they called a “near average” or normal range.
Since then, summer temperatures have shifted drastically, the researchers found.

Read more on: http://nytimes.com