The main results are as follows.The mean onset time of SCSSM is the fourth pentad of May for the period 1980 to 1991.

• 结果表明：南海夏季风爆发平均时间是5月第4候，爆发的时间和强度有显著的年际变化，爆发期间的海气状况与大气的低频振荡密切相关。