The report published by NASAconfirmed that 2018 was 0.83 degrees Celsius or 1.5 degrees Fahrenheit warmer than the temperature recorded from 1951 to 1980. NOAAfound the average mean temperatures for the contiguous USA was the 14th-warmest on record.
It was also an expensive year for natural disasters.
The obvious long-term trend of steady warming makes it easier to more accurately predict near future warming, NASA chief climate scientist Gavin Schmidtsaid. Greenland ice sheets continue to suffer mass loss, which together with similar ice sheet loss in Antarctica, contributed to sea level rise.
The combination of rising greenhouse gases and a mild El Nino underway in the Pacific Ocean means it's likely that 2019 will be hotter than 2018.
Those major disasters, plus other smaller-scale disasters, made 2018 the fourth-most costly year on-record.
A total of 6,300 weather stations, ship and buoy observations of sea surface temperatures, and Antarctic research stations were used in NASA's analyses.
The two agencies use much of the same data but perform independent analyses with minor differences in methods that yield slightly different rankings. The global surface temperature was almost 1 degree Celsius higher than average and it is because of global warming. Such cold weather has made it really hard for many to believe that global warming is real.
Global temperatures now stand 1 degree Celsius, or 1.8 degrees Fahrenheit, above the average temperature of the late 19th century. But it was short-lived, and the rest of the country has been unusually warm, which has kept the national average well above normal for January.
The conclusion reaffirms NASA's long-established finding that man-made emissions are driving climate change, which President Donald Trump and some senior administration officials frequently challenge.
Higher temperatures in the Arctic and Antarctic regions is of particular concern for scientists for several reasons.
"2018 is yet again an extremely warm year on top of a long-term global warming trend". "That's a clear upward signal".
NOAA notes that weather dynamics affect regional temperatures, so not every region experienced the same amount of warming.
"If there was no warming of average temperatures, there would be about an even chance of a daily record high maximum or daily record low minimum occurring", said Meehl, who was not involved in the report.
The US National Oceanic and Atmospheric Administration (NOAA), which monitors changes in temperature among other conditions in Earth's atmosphere and oceans, found that the annual mean temperature for the contiguous 48 states was the 14th warmest year on record.
The report shows that a lot of the Southwest, like Colorado, New Mexico, Utah and Arizona experienced drought through most of a year ago.
A still image pauses the onslaught of warmer temperatures in NASA and NOAA data summarizing global climate changes.
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