In this paper, using the Total Electron Content (TEC) data obtained from GUAM (13.58 degrees N, 144.86 degrees E) and PNGM (2.04 degrees S, 147.36 degrees E) Global Positioning System (GPS) stations, the seasonal characteristics of equatorial plasma bubbles (EPBs) in conjugate hemispheres during the Solstices and Equinoxes of 2015 are examined. The EPBs were determined using the rate of TEC (ROT) and rate of TEC index (ROTI) indices, which are good indicators for the ionospheric instabilities and behavior of EPBs. The results from all analysis were compared with each other according to hours, seasons and hemispheres. The EPBs for all seasons were detected at the postsunset local times. The intensity level of ROTI and ROTIave shows variations during Equinoxes. For both hemispheres, the occurrence probability of EBPs during the Equinoxes is a maximum of 22% while the occurrence probability of EBPs during the Solstices is a maximum of 5%. The severity of EPBs was larger during March while severity of EPBs was smallest during December. It was also observed that the EPBs during Equinoxes were more predominant in the northern hemisphere while the EPBs during June were more predominant in the southern hemisphere.