abajan wrote:They are indeed quite rare. It's just that the hyperactive hurricane seasons of late would make one think that they occur more frequently.
They're rare but not that rare. Each decade sees a handful of Category 5s.
(I know some of these will probably be downgraded in reanalysis. It's also possible a few storms might get upgraded to Category 5 as well.)
Category 5 hurricanes in the Atlantic since 1950:
1950: Hurricane Dog 160KT
1951: Hurricane Easy 140KT
1955: Hurricane Janet 150KT
1958: Hurricane Cleo 140KT
1960: Hurricane Donna 140KT
1960: Hurricane Ethel 140KT
1961: Hurricane Carla 150KT
1961: Hurricane Hattie 140KT
1967: Hurricane Beulah 140KT
1969: Hurricane Camille 165KT
1971: Hurricane Edith 140KT
1977: Hurricane Anita 150KT
1979: Hurricane David 150KT
1980: Hurricane Allen 165KT
1988: Hurricane Gilbert 160KT
1989: Hurricane Hugo 140KT
1992: Hurricane Andrew 150KT
1998: Hurricane Mitch 155KT
2003: Hurricane Isabel 145KT
2004: Hurricane Ivan 145KT
2005: Hurricane Emily 140KT
2005: Hurricane Katrina 150KT
2005: Hurricane Rita 155KT
2005: Hurricane Wilma 160KT
2007: Hurricane Dean 150KT
2007: Hurricane Felix 150KT