PDF) for all storms that made landfall from August 21st to October 31st, for all years 1900 to 2009. The graph shows damage that occurred on each day (and the X-axis shows selected dates). The data comes from the ICAT Damage Estimator.
Even though the current season -- forecasted to be much more active than average -- may appear to be off to a slow start as compared to that forecast, there is a lot of hurricane season left. September and October account for more than 60% of total historical damage, and if you add in August the total is almost 95%.The most damaging (normalized) storm occurred on September 18, 1926.