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Summer is officially here. And if you’ve noticed the long hot days are hotter than in the past, you’re right. Federal data backs it up.

Average daily temperatures across all parts of all 50 states have risen since the late 1980s. Saturday marks the 30-year anniversary of climate scientist Jim Hansen warning the U.S. Congress of a warming planet. And in those three decades, North America has warmed 1.89 degrees — more than any other continent.

Continue reading this story at StateImpact Pennsylvania »

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This story is produced in partnership with StateImpact Pennsylvania, a collaboration among The Allegheny Front, WESA, WITF and WHYY to cover the commonwealth's energy economy.