Last year was the earth's hottest in 136 years of record-keeping, NASA and the National Oceanic and Atmospheric Administration announced Wednesday.

In two separate analyses, the agencies agreed that 2015 was a record-breaker. NASA found that 2015 was 1.8 degrees Fahrenheit warmer than the late 19th century, while NOAA found 2015 was 1.62 degrees Fahrenheit warmer than the 20th century average.

"Globally averaged temperatures in 2015 shattered the previous mark set in 2014 by 0.23 degrees Fahrenheit (0.13 Celsius)," NASA reported. "Only once before, in 1998, has the new record been greater than the old record by this much."

The previous hottest year , 2014, had an average global temperature of 58.24 degrees Fahrenheit. That was already 1.24 degrees above the 20th century average.