"In 2010, Tokyo had 71 days of temperatures above 30 degrees Celsius; in 2011 and 2012, more than 60 days each. It’s been 1,000 years since Japan knew such extended heat waves, meteorologist Masamitsu Morita tells Shukan Gendai "
Source:
Summers in Japan becoming intolerable
Japan Today
July 3rd 2013