(CNN) Last year was the fourth-hottest year ever recorded, according to the National Oceanic and Atmospheric Administration and NASA, which means that the past five years have been the five warmest years in the modern record.

NOAA and NASA discussed 2018's global temperature and climate in a joint news conference Wednesday; both agencies maintain independent data that goes back to 1880 to monitor temperatures around the globe. The announcement was delayed several weeks due to the government shutdown that resulted in many NOAA and NASA employees being furloughed

If it seems like you've heard this before, you have: Eighteen of the hottest 19 years have occurred since 2001.

Global average temperature anomaly for 2018, from NOAA. Warmer colors indicate temperatures above average, while cooler colors indicate below average temperatures.

"2018 is yet again an extremely warm year on top of a long-term global warming trend," according to Gavin Schmidt, director of NASA's Goddard Institute for Space Studies.

The average global temperature has risen about 2 degrees Fahrenheit, or a little over 1 degree Celsius, since the 1880s. That puts us more than two-thirds of the way to the warming limit of 1.5 degrees Celsius that was set in the Paris climate agreement.