There are several of us in Central Indiana who dive year round. I regularly dive with folks from Indy, Terre Haute and Bloomington throughout the year. If you'd like to come and dive with us sometime, just PM me and we can exchange contact information.
I personally don't dive much in January, February and early March. I don't mind the water temps, but it's the air temps that aren't that friendly. Plus unless we have a light winter, most of the quarries are frozen over during those months. Then there's ice diving, but that's not everyone's cup of tea.
Regarding the above two recommendations ... Rich and Duane ... I'd highly recommend both of those guys. You can't go wrong either way IMO.