The 1963-64 Southwest Indian Ocean cyclone season is the first season officially listed as being reliable. The official bounds of the season ran from October 1 to April 30, and the storms listed here are done so based off observations. Therefore, the data is incomplete, and relies on reports from significantly populated areas, or ships that rode out the storms as a result. Other storms have their peak intensities estimated, using the wind-pressure relationship, or the damage they caused if they made landfall in a populated area.


Name SSHWS category 1-min winds Pressure Formed Dissipated
Amanda Category 1 cyclone 90 mph 965 mbar December 1 December 14
Betty Category 1 cyclone 75 mph 985 mbar December 23 December 28