The 1961 North Indian Ocean cyclone season had no bounds, but cyclones tend to form between April and December, with peaks in May and November. The season has no official bounds but cyclones tend to form between April and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. There are two main seas in the North Indian Ocean—the Bay of Bengal to the east of the Indian subcontinent and the Arabian Sea to the west of India. The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center releases unofficial advisories. An average of four to six storms form in the North Indian Ocean every season with peaks in May and November. Cyclones occurring between the meridans 45°E and 100°E are included in the season by the IMD.
A depression developed on January 9. It cut across northern Sri Lanka and southern India before dissipating on January 11.
A deep depression developed in the Bay of Bengal on February 18. It moved generally northward and dissipated on February 21.
From May 6–9, the JTWC tracked this system as Tropical Storm Winnie. The National Oceanic and Atmospheric Administration (NOAA) estimated that the storm attained peak one-minute winds of 155 km/h (100 mph).
In East Pakistan, 11,468 people were killed.
Caused considerable damage in southwestern India.
Caused considerable damage in East Pakistan, where wind gusts reached 155 km/h (100 mph). A storm surge of 6.4 m (21 ft) was measured in Chittagong. Due advanced warnings, put out an unprecedented 36 hours before the storm, relatively few casualties took place.
Produced torrential rain over northeastern India, with Cherrapunji recording 1,340 mm (53 in) of precipitation over a four-day span.
A severe cyclonic storm developed in the Arabian Sea on June 21. The system struck western India before dissipating on June 26.
A depression developed in the Bay of Bengal on June 27. The system struck the state of West Bengal in India and promptly dissipated.
The ninth depression of the season existed inland over eastern India. It developed on July 1 and dissipated the following day.
The depression remained around the Gujarat Peninsula for several days, resulting in prolonged rains that amounted to 680 mm (27 in) in Junagadh.
Another land depression briefly existed over western India from July 18 to July 19.
The twelfth depression of the season existed from August 27 to August 28.
Deep depression produced heavy rains over a large swath of northern India, with several areas reporting daily totals in excess of 300 mm (12 in).
Heavy rains from the storm caused significant flooding in Vidarbha and Madhya Pradeshes.
The fifteenth depression of the season developed in the northern Bay of Bengal on September 22. It then struck West Bengal before dissipating on September 23.
A deep depression developed in the Bay of Bengal on September 27. The system then moved inland over West Bengal. It meandered inland until dissipating on October 2.
Significant flooding resulted from the depression's heavy rains, with 57 fatalities occurring in Uttar Pradesh.
The final depression of the season developed in the Bay of Bengal on October 24. It soon struck Bangladesh and dissipated on the following day.