May 2017 was the second warmest May in 137 years of modern record-keeping, according to a monthly analysis of global temperatures by scientists at NASA’s Goddard Institute for Space Studies (GISS) in New York.
Last month was 0.88 degrees Celsius warmer than the mean May temperature from 1951-1980.
The two top May temperature anomalies have occurred during the past two years. 2016 was the hottest on record, at 0.93 degrees Celsius warmer than the May mean temperature.
May 2017’s temperature was 0.05 degrees Celsius cooler than May 2016. It was just 0.01 degrees Celsius warmer than the third warmest May, which occurred in 2014.
A global map of the May 2017 LOTI (land-ocean temperature index) anomaly shows that the extreme warmth that affected parts of the northern hemisphere — Siberia in particular — in prior months has partially abated.
The monthly analysis by the GISS team is assembled from publicly available data acquired by about 6,300 meteorological stations around the world, ship- and buoy-based instruments measuring sea surface temperature, and Antarctic research stations.