The vast Arctic Siberia region, already warming faster than the rest of the world, experienced record heat and fires for the second straight year in June, adding to concerns of climate scientists. Average land temperatures last month were the highest ever recorded, more than 5 degrees Celsius above normal and slightly above the June 2019 mark, according to the monthly report by Europe’s Copernicus Earth observation agency. Nowhere else in the world have temperatures in June and in the last 12 months varied the most compared to the historical average.

“What is worrisome is that the Arctic is warming faster than the rest of the world,” said Carlo Buontempo, director of the Copernicus Climate Change Service. “The exceptionally high temperatures in Arctic Siberia that have occurred now in June 2020 are equally a cause for concern.”

Methane, trapped in the organic matter sitting in the bottom of Arctic lakes, bubbles into the atmosphere when lakes become ice-free. The amount of methane released by Arctic lakes could rise to as much as 60% of all methane released due to melting in the Arctic region by the end of the century, the researchers found.

Temperatures varied widely within the region, according to Copernicus. A heatwave in western Siberia eased in June, but unusually high temperatures were recorded in Russia’s east. A meteorological station in the town of Verkhoyansk, in eastern Siberia, registered a new record for the region — 38 degrees Celsius (100.4 Fahrenheit) on June 20.