I've used my 5.0 Climashield UQ down to about 38 degrees so far, wearing a fleece top and long underwear bottoms to sleep in. Not sure it would go a whole lot lower than that...maybe low 30's.
I used a size 10 sharps needle and gutermann sew-all thread (tex 30) that I bought from Jo-ann's Fabric store. The main thing is to use polyester thread, not cotton. You don't need heavy duty thread for a quilt. It doesn't get near the stress on the seams like a hammock, tarp or backpack.
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