First of all, and not to be rude, but Ow. My eyes. Please press your Caps Lock key to the off position.

Secondly, your weather sounds like it should be just fine for the roses, as long as where you are hanging them gets plenty of sunlight (I know sometimes I have problems with hanging baskets under porches because it shades them too much.)

I'm new to this as well, but from what I've read, most of the store-bought mini roses are actually 3-4 plants in the same container to make it look 'full,' so some suggest you swish the rootball around in water to help separate them, then plant each one in its own pot, and the rest in the ground?

I'd also ease up on the fertilizer, as you may have burned the roots using it so soon after the 'stress' of repotting.

Your pails sound like they look really great - I hope someone else from the forum can hop in and give you more specific advice - you may want to read up on a few of the pests, such as spider mites and aphids to rule those out of the picture.

Have a good one, and good luck
~bubbles

Here is a link that might be useful: Saving potted gift rose

I think it might be spider mites. From what you explained, it looks like something I once experienced. They can drain a mini very quickly. Spray them with a mitecide and see if they look better in a few weeks. Also, I agree with the previous poster about fertilizing.