I'd say third week of August based on the following:
Value Season: Jan 4 - Feb 11, Aug 15 - Sept 30, Nov 28 - Dec 22
Regular Season: Apr 15 - June 16, Oct 1 - Nov 27
Peak Season: Feb 12 - Mar 31, June 17 - Aug 14
Holiday Season: Dec 23 - Jan 1
August is more prone to hurricanes.