t’s only May, and temperatures near the Arctic Circle in northwestern Russia are approaching 90 degrees. In Moscow, temperatures have shattered records on consecutive days. It has also been unusually warm in central Canada, where raging wildfires in Manitoba are sending plumes of smoke across retreating ice in Lake Winnipeg.

Summer has yet to begin in the northern hemisphere, but temperatures in high latitudes are already alarmingly warm, portending another brutally hot season while signaling more climate troubles.

Since last week, historic warmth has swelled over much of western Russian and bled into eastern Scandinavia.

On Thursday, the mercury surged to 89.4 degrees in Naryan-Mar, Russia, a town near the Arctic Ocean and almost 1,000 miles northeast of Moscow. The temperature shattered the previous monthly record of 82 degrees, according to Serge Zaka, a meteorologist in France.

Arkhangelsk, more than 600 miles north of Moscow near the shore of the Arctic Ocean, soared to nearly 90 degrees, its highest temperature ever recorded during the month.

Moscow broke temperature records over 100 years old on both Monday and Tuesday, according to the Moscow Times, reaching 86.7 degrees and 84.6 degrees. The Russian capital has seen temperatures at least 10 to 20 degrees above normal for days.