On Monday, tourists snorkel in the water in early summer in Jeju. (Yonhap)
The average temperature over the three-month period was 15.5 ° C, up 1.5 ° C from 14 ° C in the average year and the highest since record keeping began in 1961, according to the Jeju branch of the Korean Meteorological Administration.
The average high over the three months was 19.3 C and the average low was 12.1 C, also the highest on record for both categories.
By month, the average temperature in March was 12.5 C, with an average high of 16.2 C and an average low of 9 C, the highest temperatures on record for the month.
Temperatures in April and May were also warmer than average, with large fluctuations in April and a high of 30.9 ° C in part of the island on May 15.
There were 28.3 days of rain, less than 29.8 in the average year, but the amount of precipitation fell within the average range of 386.6 millimeters.
The season saw 11 days of yellow dust, the third highest number since 1961, with the first yellow dust warning since 2010 issued in March. (Yonhap)