Brett-

Going back to your original question . . . I've lived in OK and now in MN. I agree with Ken. It really doesn't get that cold down there where you need to take special measures. Make sure you have warm fingers. At about 15F (colder than you'll ever fly in) I can make it through a flight wearing those light stretchy knitted gloves. I'll wear heavy gloves during prep time. Keep your planes and field equipment in the house, as sitting in the cold will lead to premature battery drain. That should about do it.

-Scott