Big ones in recent memory:
- 1992, Andrew – Formed August 16, Dissipated August 28
- 2005, Katrina – Formed August 23, Dissipated August 30
- 2011, Irene – Formed August 20, Dissipated August 29
Very narrow window at the end of August.
And you may not think that Irene was a big deal, but the damage is already at about $20B.