And according to their study, the past five years are, collectively, the warmest years in the modern record. The top three costliest natural disasters globally were all in the United States, making it their fourth-costliest year ever, at $160 billion.
The UN's World Meteorological Organization said in November that 2018 was set to be the fourth warmest year in recorded history, stressing the urgent need for action to rein in runaway planetary warming.
2016, boosted by a strong El Nino that normally tips the mercury northwards, remains the hottest year on record.
The average global temperature during 2018 was 1.42 degrees F above the 20th-century average.
Past year was the fourth warmest on record and the outlook is for more sizzling heat approaching levels that most governments view as unsafe for the Earth, a United Nations report showed on Wednesday.
Since the 1880s, the average global surface temperature has risen about 2 degrees Fahrenheit (1 degree Celsius). "The global average temperature between now and 2023 is predicted to remain high, potentially making the decade from 2014 the warmest in more than 150 years of records".
"The long-term temperature trend is far more important than the ranking of individual years, and that trend is an upward one", WMO Secretary-General Petteri Taalas said in a statement.
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According to figures released by specialists running the world's leading temperature datasets confirmed previous estimates that 2018 was the fourth hottest year on record.
Weather dynamics often affect regional temperatures, so not every region on Earth experienced similar amounts of warming.
The WMO said heightened temperatures also contributed to a number of extreme weather events such as hurricanes, droughts and flash flooding.
NASA also found that the greatest warming trend overall was in the Arctic region, which has seen the continual loss of sea ice in recent years. NASA adds that the melting of Greenland and Antarctic ice sheets contributed to a rise in sea level.
Over the long term: Since 1880, Earth has warmed up by about 1 °C, a phenomenon driven largely by humans emitting carbon dioxide and other greenhouse gases into the atmosphere.
NASA's temperature analyses came from 6,300 weather stations, ship and buoy-based observations of sea surface temperatures, and temperature measurements from Antarctic research stations.