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According to Wiki:  The 2005 Atlantic hurricane season was the most active Atlantic hurricane season in recorded history, shattering numerous records. The impact of the season was widespread and ruinous with an estimated 3,913 deaths and record damage of about $159.2 billion. Of the storms that made landfall, five of the season's seven major hurricanes—Dennis, Emily, Katrina, Rita, and Wilma—were responsible for most of the destruction. The Mexican states of Quintana Roo and Yucatán and the US states of Florida and Louisiana were each struck twice by major hurricanes; Cuba, the Bahamas, Haiti, Mississippi, Texas, and Tamaulipas were each struck once and in each case brushed by at least one more. The most catastrophic effects of the season were felt on the United States' Gulf Coast, where a 30 ft (10 m) storm surge from Hurricane Katrina caused devastating flooding that inundated New Orleans, Louisiana and destroyed most structures on the Mississippi coastline; and in Guatemala, where Hurricane Stan combined with an extratropical system to cause deadly mudslides.

This season was the first time that the Atlantic hurricane season was more active than the typhoon season; normally, the typhoon season is always more active. This event was repeated in 2010; however, the 2010 typhoon season broke a record for the fewest storms formed, while the 2005 typhoon season had a near average season.

The season officially began on June 1, 2005, and lasted until November 30, although it effectively persisted into January 2006 due to continued storm activity. A record twenty-eight tropical and subtropical storms formed, of which a record fifteen became hurricanes. Of these, seven strengthened into major hurricanes, a record-tying five became Category 4 hurricanes and a record four reached Category 5 strength, the highest categorization for hurricanes on the Saffir-Simpson Hurricane Scale. Among these Category 5 storms were hurricanes Katrina and Wilma, respectively the costliest and the most intense Atlantic hurricanes on record. This year was also notable because the list of storm names was used by Text-Enhance" href="http://en.wikipedia.org/wiki/2005_Atlantic_hurricane_season">up and six Greek letter names had to be used.