Last month was officially the hottest May on record, according to the National Oceanic and Atmospheric Administration.
NOAA tracked temperatures 1.57 degrees Fahrenheit above the worldwide average of 58.6 degrees.
The data indicates 2015 is on pace to be the hottest year on record, with temperatures in the first five months in the surpassing the same period in 2010 as the warmest first five months.
NOAA scientists claim the heat is thanks at least in part to El Nino. The cyclical warming of the eastern Pacific Ocean can lead to what we're seeing now: record temperatures and record rainfall.
Hottest months, global heat waves - May 2015 hottest/wettest month
Last month was the hottest May on record ... again
A boy plays by a fountain in Seoul on May 26, 2015 as temperatures soared to a high of 34 centigrade across South Korea. The Korea Meteorological Administration issued on May 25 this year's first heat wave advisory as it expects temperatures to exceed 33 degrees for the next few days. AFP PHOTO / JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
A white tiger swims in a pool at Nehru Zoological Park in the Indian city of Hyderabad on May 29, 2015. Hospitals in India battled May 28, 2015, to treat victims of a blistering heatwave that has claimed more than 1,700 lives in just over a week -- the highest number recorded in two decades. Hundreds of mainly poor people die at the height of summer every year in India, but this year's figures are already the highest since 1995, when official data shows 1,677 people succumbed to the heat. AFPHOTO/ Noah SEELAM (Photo credit should read NOAH SEELAM/AFP/Getty Images)
Indian horseman Rahul and his horses cool off in a canal on the outskirts of Jalandhar on May 28, 2015, as scorching weather conditions continue across India. More than 1,100 people have died in a blistering heatwave sweeping India, authorities said, as forecasters warned searing temperatures would continue. AFP PHOTO/SHAMMI MEHRA (Photo credit should read SHAMMI MEHRA/AFP/Getty Images)
A mirage shimmers over Rajpath leading to India Gate in New Delhi on May 28, 2015. More than 1,100 people have died in a blistering heatwave sweeping India, authorities said, as forecasters warned searing temperatures would continue. AFP PHOTO / Chandan KHANNA (Photo credit should read Chandan Khanna/AFP/Getty Images)
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Not only did May mark the warmest spring and the warmest first five months of the year ever recorded worldwide, but in the United States, it was also the single wettest month ever.