This year will be the hottest ever recorded that wasn't influenced by the El Nino weather event, according to the UN.
The prediction is a jolt because El Nino has been utilized to describe temperatures and occasionally to imply that the temperature is not warming. The finding shows that the climate is in fact warming despite the impact of the El Nino which compels temperatures around the world up.
Accounting for that, this season will be among those three warmest on record. Already, 2016 and 2015 were the years.
In a statement as annual UN climate change talks hosted by Fiji start in Bonn, Germany, the WMO said the mediocre global temperature from January to September 2017 was 1.1C above the pre-industrial era.
As a consequence of an El Nino, 2016 is likely to stay the hottest year on record. However, the year 2017 is expected to join 2015 as the third or second hottest.
The decades 2013 to 2017 are inclined to be the most popular period on record.
Components of Europe such as Italy, North Africa, parts of southern and eastern Africa and the Asian part of Russia experienced warm conditions.
Indicators of temperatures include Arctic sea ice, which has been at a record and was throughout 2017.
Globally, sea surface temperatures in 2017 are available to be among the three highest on record, with some significant coral "bleaching" caused by over-warm oceans, including on Australia's Great Barrier Reef.
Important, high-income hurricanes battered the US, in August together with Harvey, followed in September.
Ophelia reached major hurricane status caused damage and then any North Atlantic storm.
Even though there's not any proof climate change is creating hurricanes like Harvey less or more frequent, it is likely rising sea levels worsen storm surges and warming is making rainfall more intense, the WMO said.
During 2017 heavy rain triggered a landslide many areas of the Indian subcontinent were struck by flooding, while east Africa remained, as was the area of southern China and Peru gripped by drought.
Drought and record temperatures were seen by Italy, heatwaves reach parts of South America, eastern Australia, and southwest Asia, and wildfires raged in Portugal Chile and the US.
WMO secretary-general Petteri Taalas stated: "The last three years have all been in the top 3 years regarding temperature records. This is part of a long-term warming trend.
"We have witnessed extraordinary weather, such as temperatures topping 50C (122F) in Asia, record-breaking hurricanes in rapid succession from the Caribbean and Atlantic reaching up to Ireland, catastrophic monsoon flooding affecting many millions of individuals and a constant drought in East Africa.
"Many of those occasions - and detailed scientific research will determine just how many - keep the tell-tale sign of climate change due to increased greenhouse gas concentrations from human actions," he explained.
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