Temperatures in the Siberian Arctic reached record averages in June, with some areas seeing rises of as much as 10C (18F), according to EU data.
Scientists say the heat has helped fan wildfires in the region, resulting in the unprecedented estimated release of 59m tonnes of carbon dioxide.
Hot summer weather is not uncommon in the Arctic Circle, but recent months have seen abnormally high temperatures.
The Arctic is believed to be warming twice as fast as the global average.
Carlo Buontempo, director of the European Union's earth observation programme, the Copernicus Climate Change Service, said the trend was "worrisome".
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Atlantis Viewpoint
Increased temperatures cause wildfires, which in turn produce CO2 emissions.