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| Tropical cyclones in 2005 | |
|---|---|
 Year summary map | |
| Year boundaries | |
| First system | 07 |
| Formed | January 4, 2005 |
| Last system | Zeta |
| Dissipated | January 6, 2006 |
| Strongest system | |
| Name | Wilma |
| Lowest pressure | 882 mbar (hPa); 26.05 inHg |
| Longest lasting system | |
| Name | Kenneth |
| Duration | 16 days |
| Year statistics | |
| Total systems | 130, 6 unofficial |
| Named systems | 94 |
| Total fatalities | 4,459 total |
| Total damage | $181.591 billion (2005 USD) |
Among them, Wilma (third image from the right in the bottom row) was the most intense, with a minimum central pressure of 882 hPa.
During 2005, tropical cyclones formed within seven different tropical cyclone basins, located within various parts of the Atlantic, Pacific and Indian Oceans. During the year, a total of 141 systems formed with 94 of these developing further and were named by the responsible warning centre. The strongest tropical cyclone of the year was Hurricane Wilma, which was estimated to have a minimum barometric pressure of 882 hPa (26.05 inHg). 2005 was above-average in terms of the number of storms. The most active basin in the year was the North Atlantic, which documented 28 named systems. The Western Pacific had an near-average season with 23 named storms. The Eastern Pacific hurricane season experienced an above-average number of tropical storm intensity systems, numbering 15. Activity across the southern hemisphere's three basins – South-West Indian, Australian, and South Pacific – was fairly significant, with the regions recording 23 named storms altogether, with the most intense Southern Hemisphere cyclone of the year, Cyclone Percy from the South Pacific Ocean basin peaking at 145 mph (235 km/h) and 900 millibars. Throughout the year, 28 Category 3 tropical cyclones formed, including eight Category 5 tropical cyclones in the year. The accumulated cyclone energy (ACE) index for the 2005 (seven basins combined), as calculated by Colorado State University was 899.6 units.
The deadliest tropical cyclone of the year was Hurricane Stan in the North Atlantic Ocean, which killed more than 1,600 people in Central America. Hurricane Katrina, also in the North Atlantic Ocean, was the costliest tropical cyclone of the season and all time (tied with Hurricane Harvey in 2017), causing more than $125 billion in damage after striking the United States, especially New Orleans and its surrounding areas.