I didn't know this:
With what I can see, if you are a snowbird and your permanent residence is in another state and you are in Florida for over 90 days in a year you have to register your car in Florida and get auto insurance in Florida.
Car Insurance for Snowbirds | Fox Business
Just found out this also, if you are a Florida resident and in Michigan for over 30 days you have to have auto insurance in Michigan, and if you are in Michigan for over 90 days, your car has to be registered in Michigan.
Out of State Car Insurance Coverage: Is It Illegal In Michigan?
I would think other states have similar laws.
A snowbird can stay in Arizona up to 7 months and not need to get insurance there or register your car there.
Snowbirds and vehicle registration laws in Arizona