The earliest ever F-hurricane (Franklin) occurred on 22 July.
A central pressure of 882 hPa was measured in Wilma – the lowest pressure ever.
For the first time (with more than 21, namely 25 named storms) it was necessary to use Greek alphabet names – Alpha, Beta, Gamma and Delta were born. Names are given to Atlantic depressions with average wind speeds above 17.5 m/s or 63 km/h.
Katrina killed more than 1200 people.
Vince was the first ever to return to Europe (West Africa -> North America -> Portugal/Spain). Vince was by the way also exceptional because it was created above seawater of only 23°C. It was normally thought that you need water of at least 26.5°C.
14 (or was it only 13 – I may have lost the count) true hurricanes (i.e. average speeds of above 32.7 m/s) was also a record.
Although the six-month Atlantic hurricane season officially ends today on 30 November forecasters warn that tropical storms and hurricanes can develop in December.
More on hurricanes at http://whatonearth.olehnielsen.dk/hurricanes.asp
On Friday 2 December the Tropical Storm Epsilon became the unprecedented 14th Atlantic hurricane of the year two days after the six-month season officially.