Most of Florida should start to have rideable winds then with cold fronts hopefully. That is a lot of coastline, about 1200 miles of it. Are you looking for waves, flatwater or ? You mentioned a school, to continue technique development of for someone traveling with you to get into kiting? Are there any on land activities that you're interested in? There is some additional general info at:
http://fksa.org/showthread.php?t=2329