Mongolia has suspended grain exports with as much as a third of its farmland suffering from severe drought after temperatures last month rose to the highest in more than half a century, agricultural officials said.

The Ministry of Agriculture and Industry has banned grain exports as it prepares for a shortfall in the autumn harvest. Temperatures in Mongolia reached their highest level in 56 years in June, according to weather reports, threatening crop production.

"This summer is really dry," said Odbayar, a spokesman with the Information and Research Institute of Meteorology, Hydrology and Environment on Friday. "Central and eastern Mongolia are most affected."