| Basin: | NIO |
| Year: | 1978 |
| Track: | 1978 North Indian Ocean cyclone season summary.jpg |
| First Storm Formed: | May 14, 1978 |
| Last Storm Dissipated: | November 29, 1978 |
| Strongest Storm Name: | 04B |
| Strongest Storm Pressure: | 938 |
| Strongest Storm Winds: | 120 |
| Average Wind Speed: | 3 |
| Total Disturbances: | 15 |
| Total Depressions: | 11 |
| Total Storms: | 5 |
| Total Hurricanes: | 3 |
| Ace Index: | 18.43 |
| Fatalities: | 1000+ |
| Damages: | 626.89 |
| Five Seasons: | 1976, 1977, 1978, 1979, 1980 |
| Atlantic Season: | 1978 Atlantic hurricane season |
| East Pacific Season: | 1978 Pacific hurricane season |
| West Pacific Season: | 1978 Pacific typhoon season |
The 1978 North Indian Ocean cyclone season had no bounds, but tropical cyclones in the North Indian Ocean tend to form between April and December, with peaks in May and November. The 1978 season produced five cyclonic storms of which developed into three severe cyclonic storms. All Five of the storms formed in the Bay of Bengal and four of those made landfall. The most notable storm of the season was Cyclone Four which hit Sri Lanka.
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from:01/05/1978 till:31/05/1978 text:May from:01/06/1978 till:01/07/1978 text:June from:01/07/1978 till:01/08/1978 text:July from:01/08/1978 till:01/09/1978 text:August from:01/09/1978 till:01/10/1978 text:September from:01/10/1978 till:01/11/1978 text:October from:01/11/1978 till:01/12/1978 text:November from:01/12/1978 till:01/01/1979 text:December
| Basin: | NIO |
| Track: | 01B 1978 track.png |
| Formed: | May 14 |
| Dissipated: | May 17 |
| 1-Min Winds: | 60 |
| 3-Min Winds: | 80 |
| Pressure: | 964 |
A depression formed in the northern Bay of Bengal on May 14 and move northward.[1] The depression slowly strengthened into a cyclonic storm On May 15. The storm reached its maximum intensity of 70abbr=onNaNabbr=on[2] before making landfall in Eastern Bangladesh on May 17 and dissipating thereafter.[1] The effects from Cyclonic Storm One if any are unknown.
| Basin: | NIO |
| Track: | 02B 1978 track.png |
| Formed: | October 25 |
| Dissipated: | October 28 |
| 1-Min Winds: | 40 |
| 3-Min Winds: | 45 |
Another tropical depression formed in the Bay of Bengal on October 25 and moved northwestward.[1] The depression became a cyclonic storm the following day[3] The storm then turned to the northeast and then back to the northwest[1] were its winds peaked at 45abbr=onNaNabbr=on before dissipating off the coast of Bangladesh on October 28.[3]
| Basin: | NIO |
| Track: | 03B 1978 track.png |
| Formed: | November 3 |
| Dissipated: | November 13 |
| 1-Min Winds: | 80 |
| 3-Min Winds: | 115 |
| Pressure: | 940 |
See main article: 1978 Sri Lanka cyclone.
| Basin: | NIO |
| Track: | 04B 1978 track.png |
| Formed: | November 17 |
| Dissipated: | November 29 |
| 1-Min Winds: | 95 |
| 3-Min Winds: | 120 |
| Pressure: | 938 |
The final tropical cyclone existed from November 19 to November 29.[4] The 1978 Sri Lanka cyclone was the strongest tropical cyclone to strike Eastern province of Sri Lanka, making landfall on November 23.