The agency said it has certified a 100.4-degree reading in the Russian town of Verkhoyansk last year as the highest temperature ever recorded in the Arctic.
Much of Siberia this year has had unseasonably high temperatures, leading to sizable wildfires.
The temperature in Verkhoyansk hit 38 degrees Celsius on Saturday, according to Pogoda i Klimat, a website that compiles Russian meteorological data.
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