"The year 2019 concludes a decade of exceptional global heat, retreating ice and record sea levels driven by greenhouse gases from human activities", the agency said.
The World Meterological Organization said global temperatures so far this year were 1.1 degrees Celsius (2 degrees Farenheit) above the pre-industrial average between 1850-1900. Some 7 million people were displaced from their homes in the first half of 2019 as a result of extreme weather caused by climate change.
The report is released as countries meet in Madrid for the latest round of United Nations climate negotiations, known as "Cop25", amid pressure to increase their ambitions to cut the greenhouse gas emissions driving climate change.
The year 2019 is on course to be the second or third warmest year on record, said the World Meteorological Organisation (WMO) while releasing its provisional statement on the "State of the Global Climate" on sidelines of the United Nations climate conference (COP25) in Madrid on Tuesday.
The assessment warns concentrations of greenhouse gases in the atmosphere have reached new record levels in 2019.
At the poles, Arctic sea ice is in long term decline and has been a relatively low levels in Antarctica since a sudden drop in late 2016. "Heatwaves and floods which used to be "once in a century" events are becoming more regular occurrences".
How is climate change affecting Europe?. "Wildfires swept through the Arctic and Australia", he said.
Nations are at the moment in essential talks in Madrid geared toward finalising guidelines for the 2015 Paris local weather accord, which enjoins nations to work to restrict global temperature rises to "well below" 2C. Projected sea level rise due to climate change could make these events more likely in the future.
And while governments spend hundreds of billions of dollars subsidizing fossil fuels, there appears to be no consensus in Madrid over how countries already dealing with a climate-related catastrophe can fund efforts to adapt to the new reality. Climate change increases the frequency of heat waves.
Even when all Paris pledges have been honoured, Earth continues to be on the right track to be greater than 3C hotter by the top of the century.
"There is no indication of a fade out of the warming", Taalas told reporters.
Part of the discussions in Madrid is aimed at getting countries to increase their climate action ambition ahead of a deadline next year. "That is climate change", said a BDF representative.
The WMO will publish its final State of the Global Climate report with complete 2019 data in March 2020.