© © AFP/ Martin Bernetti
Russia has recently seen the longest unprecedented heat wave for at least one thousand years, the head of the Russian Meteorological Center said on Monday.

Wildfires continue to rage across much of the central part of European Russia as the country experiences a heat wave, with temperatures of up to and above 40 degrees Celsius (104 degrees Fahrenheit).

"We have an 'archive' of abnormal weather situations stretching over a thousand years. It is possible to say there was nothing similar to this on the territory of Russia during the last one thousand years in regard to the heat," Alexander Frolov said.

He said scientists received information on ancient weather conditions by exploring lake deposits.

Frolov also said Russia's grain crop may decrease by at least 30% compared to last year.

On Thursday, Russia imposed a ban on the export of grain and grain products that will last from August 15 to December 31, though First Deputy Prime Minister Igor Shuvalov said the ban may be changed after the harvest is calculated in October.