- Japan Meteorological Agency (JMA)
- ～ degrees Celsius
- tie with ～
- heat wave
- two-tier high pressure systems
- ２層の高気圧（後出 Tibetan system はチベット高気圧のこと、Pacific system は太平洋高気圧のこと）
- comprise ～
- observation point
Summer 2018 hottest of postwar period: JMA
June through August 2018 was the hottest summer since the end of World War II, with the average temperature in eastern Japan 1.7 degrees Celsius higher than usual, the Japan Meteorological Agency (JMA) reported.
For western Japan, the mercury was 1.1 degrees Celsius higher than an average year, and this summer was the second hottest since 1946 when statistics began to be recorded.
A total of 18 typhoons were observed during the three-month period, tying with the historic record in 1994. JMA officials said this summer set many records "because of the abnormal climate."
According to the agency, heat waves stagnated over the archipelago due to the formation of two-tier high pressure systems, comprising the Tibetan system above and the Pacific system below.
A record high of 41.1 degrees Celsius was recorded in the city of Kumagaya, Saitama Prefecture, on July 23.
High temperature records were updated at 202 of 927 observation points across the nation. The total number of points where the mercury hit 35 degrees or higher reached 6,479 during this summer － up from 5,014 in 2010.