A South-West Indian Ocean tropical cyclone that occurs during the Austral Winter, is a rare event with approxmiately ... systems occuring between May 1 and November 1. During the Austral winter systems are more likely to either develop during or persist until May, with approximately 52% of such storms occurring during that month. Occasionally, however, storms develop in October, with approximately 34% of such storms occurring during that month. As of 2016, there have been 50 tropical cyclones known to have occurred off-season, with 47 of these occuring since the satellite era started during the 1969–70 season.