The trends of extreme precipitation characteristics (EPCs, here after) were investigated by cumulative time (1, 3, 6, 12, 24 hours) and extreme level (0.5, 1, 2.5, 5, 10%) using the 30 years precipitation records for the period of 1991-2020. Regardless of the accumulation time and extreme level, the EPCs and their changing patterns are different on various geographical location. The extreme precipitation intensity is mainly stronger in Jeju, southern coast and the northwestern regions of Gyeonggi-do, while the frequency is high in Daegwallyeong and Ulleungdo.
The results reveal that the extreme precipitation intensity is strong but infrequent in the southern coastal region, while it is relatively weak but frequent in Daegwallyeong and Ulleungdo. The intensity of extreme precipitation shows an increasing trend in Gyeongsang-do and eastern coastal regions, while a decreasing trend in Chungcheong and south-western coastal areas. The amount of extreme precipitation shows a positive correlation with the frequency and intensity of extreme precipitation, particularly with extreme precipitation intensity. However, there is a negative correlation between intensity and frequency of extreme precipitation. Considering these changes in EPCs over various regions of Korea, further studies are needed to explore the effect of global warming on the trends of EPCs.