Wow, 50 degrees and you guys think you can put the top down without a chance of cracking?
Well I am in Indiana so I'm with you Ohio guys for weather.
Here is what I do whenever I want to put my top down.
1) I reach back and poke the window with my finger
2) If I can feel the window give like a piece of rubber then its ok to put the top down.
3) If the window moves like a hard pice of plastic then I don't put the top down.
Its as simple as that.