I suppose it all depends on where you live and what the weather actually is.
After a hurricane we usually have sunny days for at least a week because it blows all the weather away. (water is cooler etc)
The guy I was talking to was guaranteeing his collector system up to 150 MPH.
I do have the south facing roof on my addition and I put an extra membrane under the shingles to mitigate problems with mounting collectors.
This is not intended as "life safety" just quality of life.
