The 1975–80 Southern Hemisphere tropical cyclone seasons ran year-round from July 1 to June 30 during each year between 1975 and 1980. Tropical cyclone activity in the Southern Hemisphere reaches its peak from mid-February to early March.
On the morning of November 30, 1975 satellite imagery showed a large cloud mass in the Timor Sea. The satellite photograph received on the morning of December 1 showed that significant organization had occurred in the cloud mass during the previous 24 hours. It was deemed at 0115 UTC that the system be named the developing cyclone Joan, located about 310 km west-northwest of Darwin. Joan's movement in the following 48 hours was towards the southwest at an average 5 km/h. The first evidence of the increasing strength of Joan came as the cyclone moved west-southwest past the northernmost areas of Western Australia on December 3. The cyclone's generally west-southwesterly track after December 2 took it away from the coast until 0900 6 December when it was about 420 km north of Port Hedland and the system turned southward. At about 2200 UTC December 7, 1975 the eye of tropical cyclone Joan crossed the coast about 50 km west of Port Hedland. The cyclone was travelling south-southwest at about 14 km/h and crossed over or adjacent to the homesteads on the pastoral properties Mundabullangana, Mallina, Coolawanyah, Hamersley, and Mount Brockman. As cyclone Joan crossed the coastal plain and the Chichester Range only a slow moderation of its intensity seems to have occurred, but as the cyclone crossed the Hamersley Range the available evidence suggests that a rapid weakening took place.
Tropical cyclone Joan was the most destructive cyclone to affect the Port Hedland area in more than 30 years. The city was subjected to sustained winds exceeding 90 km/h for about 10 hours with winds in excess of 120 km/h for three hours. The maximum measured wind gust of 208 km/h on December 8, 1975 is the fourth highest on record in Australia. Severe property damage occurred at Port Hedland and at other settlements close to the cyclone's path. Subsequent flooding damaged roads and sections of the iron ore railways, particularly that of Hamersley Iron Pty Ltd. Sheep losses were heavy but, remarkably, no loss of human life or serious injury was reported. The estimated damage to private property and public facilities is believed to have exceeded $25 million. 
Cyclone Danae struck Madagascar and then hit the east coast of Mozambique and South Africa in late January 1976. 50 people were killed in the flooding that resulted from the heavy rainfall of Cyclone Danae. WeatherSA Home: Johannesburg
Harry formed on December 15 near the Sunda Strait, and moved west-southwest through its existence. Its maximum intensity was reached as the cyclone passed north of the Cocos-Keeling Islands. The system then weakened and dissipated well east of Madagascar.
On March 27 a tropical depression developed in the eastern Indian Ocean between Indonesia and Australia. It drifted to the southwest, and slowly strengthened into a tropical storm on the 29th. Alby continued slowly southwestward, and attained cyclone status on March 30. The rate of intensification, which was slower earlier in its life, became more steady towards strengthening, and reached the equivalent of Category 3 status on April 1. Tropical Cyclone Alby turned more to the south, and quickly reached a peak of 135 mph later on April 1. After maintaining its strength for 30 hours, Alby weakened as it turned to the southeast. Its forward momentum increased over the southeast Indian Ocean, and Alby was only an 85 mph cyclone as it passed off the southwest coast of Australia on April 4. It continued rapidly to the southeast, and became extratropical on April 5 while south of the continent.
On the April 4, Tropical Cyclone Alby passed close to the southwest corner of Western Australia, killing five people and causing widespread but mostly minor damage to the southwest. The damage bill was estimated to be $39 million (2003 dollars). A man was blown from the roof of a shed and a woman was killed by a falling pine tree. Another man was killed when a tree fell on the bulldozer he was operating and two men drowned when their dinghy overturned at Albany. Storm surge and destructive waves caused coastal inundation and erosion from Perth to Busselton, damaging the Busselton Jetty and Fremantle Harbour. Fires fanned by the strong winds burned an estimated 1,140 km² of forest and farming land.
Tropical Cyclone Kerry has the distinction of being the longest lived cyclone in the Australian region. It formed on February 13, 1979 and caused severe damage in the Solomon Islands. It then tracked across the Coral Sea making landfall near Mackay, Queensland on March 1 and dissipated on March 6. Its lowest pressure was 955hPa.
Cyclone Meli struck eastern Fiji on March 25. The island of Nayau suffered a direct hit and passed close to the islands of Lakeba and Cicia. Fiji suffered tremendous crop losses and 50 people were killed On March 27, 1979, Cyclone Meli brushed Fiji at peak intensity, causing substantial damage to the island. At least 50 people were killed by the storm.
Cyclone Meli had previously passed through Tuvalu damaging Funafuti atoll.
On August 26, TCWC Perth reported that a tropical low had developed on a shear line about 1300 km (810 mi) to the northwest of Cocos Island. Over the next couple of days the depression gradually developed further before at 1800 UTC on August 27, TCWC Perth estimated that it had become a tropical cyclone and named it Tony. During the next couple of days, the system moved towards the west-southwest before on August 29 it reached its peak intensity of 95 km/h (60 mph) and a peak pressure of 990 hPa (29.23 inHg) as it approached the edge of TCWC Perth's area of responsibility. During the next day, Tony moved into the South West Indian Ocean and weakened gradually before dissipating on August 31.
Wally lasted in the southern Pacific from April 1 to April 7 and was a category one cyclone on the Australian tropical cyclone intensity scale with a peak pressure of 990 HpA/mbar. During its lifetime it made landfall on the second biggest island of Fiji – Viti Levu.