Cloudy weather last summer would result in poor flower bud set. Look closely to make sure there are no dead flower buds. If there are, the bud set was OK but the winter weather killed the flower buds. If there are still viable flower buds, it just mean that your plants are very late this season. Many parts of the country are experiencing this. In some areas, some plant are a month late.

Thank you. I'm not seeing any buds, dead or alive, just a few dead blooms (the few that did actually make it). I am noticing now some brown bulbous growths on the leaves, so I guess I'm off to look up what that is.

Thanks for the info.

Azalea leaf gall.

It shouldn't be related to the lack of bloom.

Here is a link that might be useful: Azalea Leaf & Flower Gall

In Indiana, I doubt that they are Formosa azaleas.