Summer in Japan this year was the country's hottest since records began in 1898, the weather agency said Friday.

From June to August, the agency recorded "considerably higher" average summer temperatures in "northern, eastern, and western Japan."

"The average temperature anomaly in Japan, based on observations at 15 locations, was +1.76 degrees Celsius, far exceeding that of 2010 (+1.08 degrees C), which was the highest since statistics began in 1898 and the highest for summer," it said in a statement.