It found globally-averaged temperatures in 2016 were 0.99 degrees Celsius warmer than the mid-20th century mean.
After setting temperature records two years in a row, scientists this week confirmed 2016 was hotter than any year in recorded history. "The pattern is very clear", said Deke Arndt of the National Oceanic and Atmospheric Administration. The first eight months of the year were each record warm, NOAA said.
Scientists point to human-caused changes over the past decades as a major factor that led to increased temperatures.
While climate phenomena like the El Niño or La Niña can impact global averages, 2016 only experienced a warming effect from El Niño for about a third of the year, but that same warming effect was also present for most of 2015. No land areas were cooler than average for the year, and record-breaking warm temperatures happened in several areas, including far eastern Russia, Alaska, far western Canada, portions of the eastern US, much of Central America and northern South America and more.
Despite the recent trend, experts are confident that temperatures won't reach a new peak in 2017 due to the El Niño having now faded.
NOAA says the annual global temperature record has been broken five times since the start of the 21st century.
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We might even look back at these record years one day and consider them "cool", says Australian National University climate scientist Sophie Lewis.
Schmidt said his calculations show most of the record heat was from heat-trapping gases from the burning of oil, coal and gas. The average statewide temperature for 2016 was 2.4 degrees Fahrenheit above the 20th century average.
Sixteen of the 17 warmest years on record have occurred since 2001, according to readings.
NASA concurred with NOAA, also declaring 2016 the warmest year on record in its own data that tracks the temperatures at the surface of the planet's land and oceans, and expressing "greater than 95 percent certainty" in that conclusion.
Last year's heat helped set other records as well. Arndt put the El Nino factor closer to a quarter or a third. October, November, and December of 2016 were the second warmest of those months on record - in all three cases, behind records set in 2015.
There was an unprecedented heatwave in India and levels of ice melt in the Arctic.