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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 and ended on May 1.
Seasonal summary
Systems
Tropical Disturbance Anne
Anne existed on August 15 and didn’t last a day. Anne also had a peak at a small 25 miles per hour (35 kilometers per hour.)
Tropical Depression Brenda
Brenda existed from August 16 to August 18. The peak was 30 miles per hour or 45 KM/H.
Tropical Storm Claude
Claude existed from December 24 to January 10.
Tropical Cyclone Denise
On January 7, Cyclone Denise passed north of Mauritius, producing wind gusts of 170 km/h (110 mph). Later, the storm crossed over Réunion, dropping record rainfall. Over a 24-hour period, Denise dropped 1,825 mm (71.9 in) of rainfall at Foc Foc, Réunion, of which 1,144 mm (45.0 in) fell over 12 hours; both precipitation totals are the highest recorded worldwide for their respective durations. Over 48 hours, precipitation totaled 2,230 mm (88 in) at Bras Sec. The heavy rains caused flooding that killed three people, and caused severe road and crop damage.
Tropical Depression Evelyn
Evelyn existed from January 19 to January 20.
Tropical Depression Francine
Francine existed from January 30 to February 1.
Tropical Storm Germaine
Germaine existed from February 14 to February 17.
Tropical Storm Hilary
Hilary existed from February 20 to February 23.
Tropical Cyclone Ivy
Ivy existed from March 3 to March 12.
Tropical Storm Martha–Judith
Judith was the tenth cyclone of the season and was formed in the Australian basin on February 23.