1965–66 South-West Indian Ocean cyclone season
The 1965–66 South-West Indian Ocean cyclone season was a near average season, despite beginning unusually early on August 9 with the formation of an early-season tropical depression, Anne. Systems. Tropical Depression Anne. Anne existed from August 9 to August 15. Tropical Depression Brenda. Brenda existed from August 16 to August 18. Tropical Cyclone Alice. Alice existed from November 30 to December 5. Severe Tropical Storm Claude. Claude existed from December 24 to January 10. Tropical Cyclone Carol–Daisy. Carol-Daisy formed on December 25, entered the basin on January 1 and  dissipated the next day. Tropical Cyclone Denise. On January 7, Cyclone Denise passed north of Mauritius, producing wind gusts of . Later, the storm crossed over Réunion, dropping record rainfall. Over a 24-hour period, Denise dropped of rainfall at Foc Foc, Réunion, of which fell over 12 hours; both precipitation totals are the highest recorded worldwide for their respective durations. Over 48 hours, precipitation totaled at Bras Sec. The heavy rains caused flooding that killed three people, and caused severe road and crop damage. Tropical Cyclone 13S. 13S existed briefly from January 11 to January 14. Tropical Disturbance 17S. 17S  existed from January 16 to January 19. Tropical Depression Evelyn. Evelyn existed from January 19 to January 20. Tropical Depression Francine. Francine existed from January 30 to February 1. Moderate Tropical Storm Germaine. Germaine existed from February 14 to February 17. Moderate Tropical Storm Hilary. Hilary existed from February 20 to February 23. Intense Tropical Cyclone Ivy. Ivy existed from March 3 to March 12. Moderate Tropical Storm Martha–Judith. Judith was the tenth cyclone of the season and was formed in the Australian basin on February 23. Tropical Cyclone Nellie. Nellie was formed in the Australian basin and existed  from March 21 to 23. Moderate Tropical Storm Lily. Lily existed from April 22 to May 1.