 Activity was somewhat below average in September , with only one tropical cyclone making landfall , Maemi . However , Maemi was the strongest tropical cyclone of the season and was the costliest with roughly US $ 4 @.@ 8 billion in damage , mostly in South Korea . Tropical cyclogenesis and activity continued to decline after August , with October featuring only three tropical storms . However , two , Ketsana and Parma , reached typhoon intensity ; both stayed away from land . November featured less storms but was climatologically average , with two typhoons developing . The second typhoon , Lupit , devastated portions of Yap State , resulting in approximately $ 1 @.@ 7 million in damage . In December , the JTWC and PAGASA monitored a sole tropical system east of the Philippines , though the JMA did not monitor or classify any tropical cyclones during the month . 
 Activity was somewhat below average in September , with only one tropical cyclone making landfall , Maemi . However , Maemi was the strongest tropical cyclone of the season and was the costliest with roughly US $ 4 @.@ 8 billion in damage , mostly in South Korea . Tropical cyclogenesis and activity continued to decline after August , with October featuring only three tropical storms . However , two , Ketsana and Parma , reached typhoon intensity ; both stayed away from land . November featured less storms but was climatologically average , with two typhoons developing . The second typhoon , Lupit , devastated portions of Yap State , resulting in approximately $ 1 @.@ 7 million in damage . In December , the JTWC and PAGASA monitored a sole tropical system east of the Philippines , though the JMA did not monitor or classify any tropical cyclones during the month . 
Activity was somewhat below average in September , with only one tropical cyclone wit landfall , Maemi . However , Maemi was the strongest tropical cyclone of the season and was the costliest wid roughly US $ 4 @.@ 8 billion in damage , mostly in South Korea . Tropical cyclogenesis and activity continued to decline after August , ww/October featuring only three tropical storms . However , 2 , Ketsana and Parma , reached typhoon intensity ; both stayed away from land . November featured less storms but was climatologically average , witwitt2yphoons developing . da second typhoon , Lupit , devastated portions of Yap State , resulting in approximately $ 1 @.@ 7 million in damage . In December , the JTWC and PAGASA monitored a sole tropical system east of the Philippines , though the JMA did not monitor or classify any tropical cyclones durin the month .