The UN has validated a record high in Arctic temperature, at 38 degrees Celsius, or 100.4 degrees Fahrenheit, measured during a prolonged Siberian heatwave in 2020.
The United Nations has officially recognised the 38 degrees Celsius measured in Siberia last year as a new record high for the Arctic, sounding "alarm bells" over climate change.
The development on Tuesday is the first time the World Meteorological Organization (WMO) has added record heat in the Arctic to its archive of extreme weather reports.
"This new Arctic record is one of a series of observations reported to the WMO Archive of Weather and Climate Extremes that sound the alarm bells about our changing climate," its chief Petteri Taalas said in a statement.
The temperature, which the agency pointed out was "more befitting the Mediterranean than the Arctic", was measured at a meteorological station during an exceptionally prolonged Siberian heatwave.
It came amid an unprecedented wave of record temperature spikes globally, the UN agency said.
READ MORE: Arctic mission warns irreversible warming tipping point likely triggered
"More befitting the Mediterranean"
The sweltering heat, equivalent to 100.4 degrees Fahrenheit, was seen on June 20, 2020 in the Russian town of Verkhoyansk, marking the highest temperature ever recorded above the Arctic Circle, according to WMO.
Verkhoyansk lies about 115 kilometres (70 miles) north of the Arctic Circle and temperatures have been measured there since 1885.
The average temperatures across Arctic Siberia reached up to 10C above normal for much of the summer last year, it said, adding that this had fuelled fires and massive sea-ice loss.
The heatwave also played a significant role in 2020 being designated one of the three warmest years on record globally.
Last year also saw a new record high of 18.3C for the Antarctic continent, Taalas said.
The WMO is still seeking to verify the 54.4C recorded in both 2020 and 2021 in the world's hottest place, Death Valley in California.
And its experts are also working on validating a new European temperature record of 48.8C reported on the Italian island of Sicily this past summer.
The WMO's archive "has never had so many ongoing simultaneous investigations", Taalas said.
Although all parts of the planet are warming, some areas are heating faster than others, and the Arctic's pace of change is more than twice the global average.
READ MORE: Warming Arctic, heating tensions