The wildfires can burrow into rich organic material, such as the vast peatlands that ring the Arctic, and smolder under the snowpack throughout the frigid winter.
Abnormally hot May weather resembles midsummer with air temperatures as high as +35C.
Fairbanks' May 10 temperature was two degrees below the daily record, while snow melt from an above-normal year is flooding Interior rivers.
Ketchikan became the first city in Alaska to hit 80 degrees this year on Saturday, as three other cities in Southeast Alaska also set temperature records.
With Russia on Covid-19 lockdown, 77 houses were burned down in Novosibirsk and Kemerovo regions.
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