Part II
This section answers other frequently asked questions about tropical storm and hurricane activity.
(1) What is the average number of tropical cyclones per year? Table 7 gives the average number of tropical cyclones which reached tropical storm, hurricane and major hurricane strength for selected time periods. The 30-year period from 1981-2010 is believed to provide the best current climatology because it samples equally the active and inactive phases of a multi-decadal cycle in Atlantic tropical cyclone frequency using modern increased monitoring capabilities. Using this period, the climatological mean numbers of tropical storms, hurricanes and major hurricanes are twelve, six, and three, respectively.
