Hey Carl!
I live in the country as well and having your plants on your roof always seems like a good idea but it isnt worth the risk. Police helicopters do not fly around my house because of where i live but drug dealers in small personal planes do which is a problem. If they see your stuff on the roof they will come back later in the year and steal them. Doesnt always happen but i still wouldnt risk it.
That being said it isnt to late yet. As for the heat i am not familiar with faranhiet but i just looked it up and i can say in my area the hotter the better. You may encounter problems if it gets very hot. Are the days humid or dry. If they have poped though the dirt you should water them until the water drains out the holes in the bottom of your container. I always water my plants when the soil is dry and crumbly which always has worked for me. The leaves will droop if there isnt enough water.
hope that helps.
best of luck
