Average temperatures in Fukushima, Tokyo, and Okinawa from January 2011 to December 2011. Months with an average temperature of 15°C or more in Tokyo and Fukushima are shaded (May to October). In July and August, the average temperatures in Fukushima were not below 25°C and were similar to Tokyo and Okinawa.
Hiyama et al. BMC Evolutionary Biology 2013 13:168 doi:10.1186/1471-2148-13-168