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Ten years of latitudinal variation of minimum Outgoing Longwave Radiation (OLR) over South East Asia was examined by using weekly OLR data from National Oceanic and Atmospheric Administration (NOAA) polar-orbiting satellites. The study was carried out using data collected from January 2000 to December 2010 which covered a region from longitudes 95°E-110°E; latitudes 20°N-20°S. Fourier function fitting was used to show the annual propagation of minimum OLR and created a new model of latitudinal variation of minimum OLR. The created model can be used to examine the latitude where minimum OLR occur.