1965–66 South-West Indian Ocean cyclone season

Unknown Storm Anne

Tropical depression (SSHWS)
Duration	August 15 – August 15
Peak intensity	45 km/h (30 mph) (1-min)

Anne existed on August 15.

Tropical Disturbance Brenda

Tropical disturbance (MFR)
Tropical depression (SSHWS)
Duration	August 16 – August 18
Peak intensity	45 km/h (30 mph) (10-min)

Brenda existed from August 16 to August 18.

Tropical Cyclone Alice

Category 1 tropical cyclone (Australian scale)
Category 1 tropical cyclone (SSHWS)
Duration	December 1 – December 5
Peak intensity	65 km/h (40 mph) (10-min)  998 hPa (mbar)

Alice existed from December 1 to December 5.

Moderate Tropical Storm Claude

Moderate tropical storm (MFR)
Tropical storm (SSHWS)
Duration	December 24 – January 10
Peak intensity	75 km/h (45 mph) (10-min)

Claude existed from December 24 to January 10.

Tropical Cyclone Carol-Daisy

Category 1 tropical cyclone (Australian scale)
Category 1 tropical cyclone (SSHWS)
Duration	January 1 (entered basin) – January 2
Peak intensity	65 km/h (40 mph) (10-min)  997 hPa (mbar)

Carol-Daisy entered the basin on January 1 and dissipated the next day.

Tropical Cyclone Denise

Tropical cyclone (MFR)
Category 2 tropical cyclone (SSHWS)
Duration	January 2 – January 11
Peak intensity	140 km/h (85 mph) (10-min)

On 7–8 January 1966, tropical cyclone Denise dumped 1,825 mm (71.9 in) on Foc-Foc, La Réunion. 3 deaths. It established a 24-hour rainfall record that still holds as of 2017.^[1]

Tropical Cyclone 13S

Category 1 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Duration	January 11 – January 13
Peak intensity	75 km/h (45 mph) (10-min)  995 hPa (mbar)

13S existed briefly from January 11 to January 13.

Unknown Storm 17S

Tropical depression (SSHWS)
Duration	January 16 – January 19
Peak intensity	45 km/h (30 mph) (1-min)

17S existed from January 16 to January 19.

Tropical Disturbance Evelyn

Tropical disturbance (MFR)
Duration	January 19 – January 20
Peak intensity	45 km/h (30 mph) (10-min)

Evelyn existed from January 19 to January 20.

Tropical Disturbance Francine

Tropical disturbance (MFR)
Duration	January 31 – February 1
Peak intensity	45 km/h (30 mph) (10-min)

Francine existed from January 31 to February 1.

Tropical Depression Germaine

Tropical depression (MFR)
Duration	February 14 – February 17
Peak intensity	55 km/h (35 mph) (10-min)

Germaine existed from February 14 to February 17.

Tropical Depression Hilary

Tropical depression (MFR)
Duration	February 20 – February 23
Peak intensity	55 km/h (35 mph) (10-min)

Hilary existed from February 20 to February 23.

Intense Tropical Cyclone Ivy

Intense tropical cyclone (MFR)
Duration	March 3 – March 12
Peak intensity	165 km/h (105 mph) (10-min)

Ivy existed from March 3 to March 12.

Unknown Storm Martha-Judith

Duration	March 3 (entered basin) – March 7
Peak intensity	Winds not specified

Judith was the tenth cyclone of the season.

Unknown Storm Nancy-Kay

Duration	March 17 – March 29
Peak intensity	Winds not specified

Unknown Storm Nellie

Tropical storm (SSHWS)
Duration	March 23 (entered basin) – March 24 (exited basin)
Peak intensity	95 km/h (60 mph) (1-min)  989 hPa (mbar)

Tropical Depression Lily

Tropical depression (MFR)
Duration	April 22 – May 1
Peak intensity	55 km/h (35 mph) (10-min)

Lily existed from April 22 to May 1.