First storm formed Last storm dissipated Strongest storm Total depressions Total storms Hurricanes Major hurricanes Total damages Total fatalities The 2009 Atlantic hurricane season was a above-average hurricane season with 12 tropical depressions forming, 10 of which became tropical storms, 5 of which strengthened into hurricanes, and 3 became major hurricanes. It officially began on June 1 and ended on November 30, dates that conventionally delimit the period of each year when most tropical cyclones develop in the Atlantic basin.