It's not just Canada and the Pacific Northwest of the U.S. which have been suffering extreme temperatures. Russia, Finland and other north eastern European nations have also reported record breaking heat. 

Moscow and Helsinki weather stations both reported the hottest June days on the country's respective records, with the thermometers hitting 34.8°C and 31.7°C. 

"This summer has seen serious signs, both domestically and globally, of the effects of the climate crisis, and reform of the climate law can no longer be delayed," the Finnish Association for Nature Conservation said, calling for the nation's government to act. 

Stations in Belarus and Estonia also reported heat in the 30's, which is far higher than usual in the region. 

The cause of such high temperatures is a "persistent northward bulge in the polar jet stream," according to NASA's Earth Observatory. 

The jet stream is a climate system that warms Europe with warm air from the equator, which is propelled northwards each year. 

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Meteorologists in Finland have warned the heatwave will remain for at least 10 days, and perhaps even until the beginning of August. 

Finnish broadcaster Yle said the heat is likely to be concentrated in the south and east of the country, which is where the capital Helsinki is located. 

Although many Finns have been enjoying the unusual heat, there are already environmental changes being spotted. 

The Finnish Environment Institute said it has observed increasing numbers of blue-green algae has been observed on the lakes for which the Scandanavian nation is famous.