The World Meteorological Organisation says global temperature records continue to break, and the number of extreme weather events continues to rise.
The new data emerges as countries meet in Morocco to discuss the Paris Agreement on climate change, and curb greenhouse gas emissions.
Hot, hotter, hottest: it seems every year is determined to outdo its predecessors.
The United Nations weather agency has released a report showing global temperatures are climbing and weather events intensifying, as the world warms.
Deputy Secretary General of the World Meteorological Organisation, Elena Manaenkova, says 2011-2015 was the hottest five-year period since records began.