To identify the characteristics of extreme heat events and tropical nights in major cities, the correlations between automated synoptic observing station (ASOS), automatic weather station (AWS), and temperature in seven metropolitan areas were analyzed. Temperatures at ASOS were found to be useful sources of the reference temperature of each area. To set the standard for identifying dates of extreme heat events in relation to regional topography and the natural environment, the monthly and yearly frequency of extreme heat in each region was examined, based on the standards for extreme heat day (EHD), tropical night day (TND), and extreme heat and tropical night day (ETD). All three cases identified 1994 as the year with the most frequent heat waves. The frequency was low according to all three cases in 1993, 2003 and 2009. Meanwhile, the yearly rate of increase was the highest in 1994, followed by 2010 and 2004, indicating that the frequency of extreme heat changed significantly between 1993 and 1994, 2003 and 2004, and 2009 and 2010. Therefore all three indexes can be used as a standard for high temperature events. According to monthly frequency data for EHD, TND, and ETD, July and August accounted for 80% or more of the extreme heat of the entire year.

Abstract
 1. 서 론
 2. 자료 및 방법
 3. 결과 및 고찰
  3.1. 대표지점 선정
  3.2. Extreme heat day의 빈도분석
  3.4. Extreme heat와 tropical night day의 빈도분석
 4. 결 론
 참 고 문 헌

• 정우식(인제대학교 대기환경정보공학과, 대기환경정보연구센터) | Woo-Sik Jung (Department of Atmospheric Environmental Information Engineering, Atmospheric Environment Information Research Center, Inje University)
• 박종길(인제대학교 환경공학과, 대기환경정보연구센터) | Jong-Kil Park (Department of Environmental Engineering, Atmospheric Environment Information Research Center, Inje University) Corresponding author
• 김은별(인제대학교 대기환경정보연구센터) | Eun-Byul Kim (Atmospheric Environment Information Research Center, Inje University)