I have been through: Gabrieale, Gene (sp??), Charlie, Francis, and Ivan (as best as I can remember... hell, maybe others, I lost count). All in Florida. We rode Gabrielle out on the boat. First let me tell you: THERE IS NO PLACE SAFE IN FLORIDA. Bloody state is only about 120 miles wide. Most hurricanes are bigger than the state. Don't think you can put it up on stands and walk away without worrying about damage. Of course, putting it on stands in the middle of the state, totally de-rigged, wellded to the ground, etc, etc is a lot safer than tied up on a morring ball on Key West waiting for the Cat 5 to do its worst... but just forget the whole notion that you are safe anywhere.
I will also restate what PB said: Why leave it there? Does your insurance company know? I cannot remember if it was Boat US or our other broker, but they told us that if we left our boat unattended, ESPECIALLY DURING HURRICANE SEASON, they would drop us and it would not be covered. Period. No unattended boats.
I will also say that when we did Gabrielle, three boats sank around us and broke loose. All three of them were unattended - so I can totally understand why Marinas have that rule... and by the way, it is safer for boat owners too. You will see many marina contracts trying to push you out on a approaching storm, but I scratch that clause out (after a verbal reminder with the dock master) and make all initial that I WILL NOT be leaving on a storm. KEEP THAT COPY HANDY IN AUGUST, SEPTEMBER, AND OCTOBER!! The will have me for better or worse. If they will not let you do that, go find another marina because you will not have time to secure in 48 hours.. and you can lose more than just your boat (like, your life). All the spots will be taken anyway.
If by some chance you do not care about insurance or what happens to your boat during those months and cannot move during hurrican season, I would probably urge you to find a pull-out marina as far north as you can get. The south part of Florida is longer and shallower than the northern regions and you have a little less likelihood of storm surge. Of course, Ivan wiped out Gulf Shores and Pensacola (by storm surge), so this is a general approximation... but a Cat 5 in south Florida with the same surge would have gone a lot further inland. Also, the SWest side of Florida in general is probably struck a little less than the rest of the state... but the last 5-7 years seem to be changing that proportion.
In conclusion, if AT ALL POSSIBLE, do not leave your boat unattended in Florida. I would actually tell you to move it to Texas during those months (Clear Lake) because it has very reasonable slippage and you insurance will likely drop significantly (60-70%). If you use Boat US, they will discount the change mid-term versus having to re-write a new policy. The docks (in Texas) are nice and seem to be well made and it will take a strong storm and direct hit for significant damage. None of that is neccessarily true for Florida. If not, role the dice and take your chances... but you better call you insurance company and tell them your plans - they may make the decision for you.
PS Dockage in Florida, 1 year contract, all paid up-front, about 15-17/foot for liveaboard (and more in many places). As cheap as about $13/foot non-liveaboard... but lots of extras like electricity and liveaboard fees, and person fees (LA fee is about 120-150/month, PLUS $50 first person, $25 each person there after... all per month), plus any club fees. You will also get on a waiting list (sometimes 2 years long) to be fotunate enough to pay these "very reasonable" prices. Vasoline is NOT included. Again, this is full time, 1 year contract, paid up front, cash.
Texas slippage: Often no LA fee or per person fee. A nice marina is somewhere around $6-8 month. That is it. This is per month, not paid up front cash. These marinas are often brand new, floating docks, workout center, restaurants, Country clubs...
Our insurance changes from 4600/year east of the Mississippi to 2200 year west. I am a VERY experienced boater with NO claims, ever, and I had several insurance companies that would not cover me east of the Mississippi.
Now how much is the true cost difference between Florida and Texas (not to mention the peace of mind)?? Get the picture?