The summer of 2019 has been a hot one in the U.S.  During a stretch of mid-July more than 120 million people lived in areas under heat warnings. And it’s part of a larger trend.

Of 244 U.S. cities analyzed by Climate Central, 75% have recorded an increase in extremely hot days since 1970.

Even the Jersey Shore, where many residents go to escape the heat in the summer, is experiencing more heat waves.