Tropical Weather
Hurricane Categories
Hurricanes are rated using the Saffir-Simpson scale. For more details, look below.  
Saffir-Simpson Hurricane Wind Scale
The Saffir-Simpson Hurricane Wind Scale is used to classify the strength of hurricanes. The scale uses wind speed as a determining factor...with hurricanes rated from Category 1 (74-95 mph) to Category 5 (155 + mph).
Link of Interest
More About The Scale
Below is a table showing the Saffir-Simpson Hurricane Wind Scale, along with a few past hurricanes and where they were represented on the scale.
Category Wind Speed (mph) Example
Category 1 Hurricane 74-95  
Category 2 Hurricane 96-110  
Category 3 Hurricane 111-130 Jeanne (2004)
Category 4 Hurricane 131-155 Ike (2008)
Category 5 Hurricane 155+ Andrew (1992) is the U.S. government's official web portal to all federal, state and local government web resources and services.