"The world just experienced its hottest June on record. The heat was driven in large by part by the hottest ocean temperatures since recordkeeping began more than 130 years ago. That makes this the third-warmest start to the year." This follows the hottest May recorded.
When looking at land areas only, this was the 7th-hottest June. Temperatures averaged over land were 1.7°F above average.
It’s the ocean surface temperatures that put the month over the top.
But, according to NBC News, it was only the 33rd warmest June in the United States.