The United Kingdom Met Office, the U.K.'s weather service, said global temperatures over the next five years will average somewhere between 58.51 and 59.49 degrees Fahrenheit, or 14.73 to 15.27 Celsius. Using much of the same data, NOAA estimates that global temperatures were 1.42 degrees Fahrenheit (0.79 degrees Celsius) higher than the 20th-century average.
The participants will include Gavin Schmidt, director of NASA's Goddard Institute for Space Studies, and Deke Ardnt, chief of the global monitoring branch of NOAA's National Centers for Environmental Information, NASA officials said in a statement.
Both organisations contributed data to the WMO.
Earth's long-term warming trend continued in 2018 as persistent warmth across large swaths of land and ocean resulted in the globe's fourth hottest year in NOAA's 139-year climate record.
The British Met Office, which also contributes data to the WMO, said temperatures could rise to 1.5 degrees Celsius above pre-industrial times, for instance, if a natural El Nino weather event adds a burst of heat. Nine of the 10 warmest years have occurred since 2005, with the last five years comprising the five hottest.
"That is not saying the Paris Agreement is done for. but it's a worrying sign", he said.
January 1 to December 31, 2018, according to NASA. The Paris pact responded to a 1992 United Nations treaty under which all governments agreed to avert "dangerous" man-made climate change.
The report also noted that warming is being felt most in the Arctic, where sea ice continues to melt, raising the sea level.
US President Donald Trump, who has cast doubt on mainstream climate science and promotes the coal industry, plans to withdraw the United States from the Paris Agreement. He did not mention climate change in his State of the Union speech on Tuesday.
Patrick Verkooijen, head of the Global Centre on Adaptation in the Netherlands, told Reuters that the WMO report showed "climate change is not a distant phenomenon but is here right now".
He called for more, greener investments, ranging from defences against rising seas to drought-resistant crops.