Scientists with the National Oceanic and Atmospheric Administration released a study Thursday claiming there’s no hiatus in global warming. But new satellite-derived temperature measurements show there’s been no global warming for 18 years and six months.

“For 222 months, since December 1996, there has been no global warming at all,” writes climate expert Lord Christopher Monckton, the third viscount Monckton of Brenchley

“This month’s [satellite] temperature – still unaffected by a slowly strengthening el Niño, which will eventually cause temporary warming – passes another six-month milestone, and establishes a new record length for the Pause: 18 years 6 months,” Monckton adds.

Monckton’s data comes as NOAA scientists release updated data purporting to show there’s actually been no hiatus in global warming. NOAA scientists made adjustments to temperature records to show more than twice as much warming as the old analysis at the global scale from 1998 to 2012.

“Newly corrected and updated global surface temperature data from NOAA’s [National Centers for Environmental Information] do not support the notion of a global warming ‘hiatus,’” wrote NOAA scientists in a new study.

The difference between Monckton’s data and NOAA’s data is that satellites measure the lowest few miles of the atmosphere, temperature measurements from government scientists rely on thousands of weather stations, buoys and ships across the world’s surface.

Both satellites and surface temperature readings, however, showed prolonged periods without statistically significant warming trends — 15 years for surface temperatures and more than 18 years for satellites.

Scientists have already pushed back against NOAA’s new study. The news site Mashable interviewed about a dozen climate scientists not involved in the study, and nearly all of them said “the study does not support the authors’ conclusion that the so-called warming pause never happened.”

“Instead, they said it simply proves that changing the start and end dates used for analyzing temperature trends has a big influence on those measurements, a fact that was already widely known,” Mashable reported.

“The main claim by the authors that they have uncovered a significant recent warming trend is dubious,” scientists with the libertarian Cato Institute wrote in an open letter on the NOAA study.

“The significance level they report on their findings (.10) is hardly normative, and the use of it should prompt members of the scientific community to question the reasoning behind the use of such a lax standard,” they wrote.

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