NOAA’s ‘New Normals’ Climate Data Raises Questions About What’s Normal
Does using 30-year weather averages mask rapid global warming?
By Bob Berwyn and Matt deGrood
May 15, 2021
A bicyclist rides along a flooded street as a powerful storm moves across Southern California on Feb. 17, 2017 in Sun Valley, California. Credit: David McNew/Getty Images
Related
Share this article
When climatologists started standardizing global weather data about 100 years ago, they didn’t know that heat-trapping greenhouse gases were already pushing the planet’s climate inexorably in one direction, off the charts of human experience.
But people like to measure things in understandable segments, so, based on the data it had at the time, the World Meteorological Organization created three-decade climate reference periods they called “climate normals” against which they could measure daily temperatures, unusual heat waves, cold snaps or big rainstorms.