Without a drysuit, your winter diving options will be quite limited. The water temps are bearable in a 7mm with a hooded vest ... at least for the 1st dive. It's the surface interval that's the problem. After coming out of the water cold and wet, it's very hard to warm up. If you are able to get warm, you're then looking at getting back into a cold, damp wetsuit for the 2nd dive.
With the right surface amenities and some tricks, it can be done. You need a shelter to get in that is warm and out of the wind. At local quarries this typically requires a propane heater and an existing shelter or a canopy with attached sides. Getting ready for a 2nd dive absolutely requires warm water. Not hot ... but warm. In the past, before I bought my drysuit, I would bring old gallon milk jugs filled with hot water in a cooler. By the time I needed them they'd be warm and no longer hot. These would be used to warm up the suit, gloves and hood before the 2nd dive. I'd then pour some of the water between the suit and my skin before getting in the water.
Another problem you're going to have is access. Many of the local quarries close over the winter. One place that is kinda close to you is Blue Springs Quarry in Waldron, IN. It is always open. It's pretty much a 'self-serve' dive site these days. Sign yourself in, drop the money in the slot and dive at your own risk. It also has a nice shelter with covered sides. All you'd need is a propane heater and some jugs of hot water. It's not a very exciting site, but it has decent depth and some stuff to look at. I usually hit it a few times during the winter when I need a fix. I rarely dive it the rest of the year. At $20 it's too expensive to justify diving there other than for getting that winter fix when there are few other options.
