Other than that it depends where you are, if in TX for example wind and hail is a must, in CA not so much so know the local perils you may face and go from there. 

MO has had Wind and Hail issues and FL is just FL. 

And over the summer we had a hell storm and we filed an insurance claim to have our roof replaced due to hail damage.

Foremost said they would not cover it due to the wind and hail risk. 

if you use a Class 4/hail resistant shingle (costs more!)

You will need to know factors such as economic trends, population shifts in or out, state laws and local laws (landlord friendly vs tenant friendly etc)... physical property hazards by season (flooding, rain, hail, fire) or in general (ie I personally can't fathom investing in New Orleans unless it was to AirBNB for the short term and then sell the property)   - If you can narrow down to one or two states, then I would look for "where are the tenants I want to deal with located" theres so many ways to answer that question but you may want to start looking in a major metro area... most states have less than 10 major cities or areas of decent population density. 

We have sunroofs in our primary and we get some hail but no big stones.

In a city that has pretty mild temps but gets lots of rain, wind, hail etc.

In a city that has pretty mild temps but gets lots of rain, wind, hail, snow etc.

I bought a house that way, where I expected it to close as a move in ready house, but it was hit by hail during the contract period.