Speaking from lots of cold weather experience.
I have been a carpenter working outside every day for almost 18 years. We work in temps down to -37.
Here's some info take it for what it's worth..
Biggest reason any of my crew guys have had cold issues comes down to circulation. Arms, wrists, hands, legs, ankles, feet. Good gear designed to keep you warm is great but if your circulation is bad none if it will work. Make certain your gear does not cut it off in any way shape or form. Also look into and do exercises designed to aid in improving your circulation to these areas. Also slowly acclimatize yourself to the conditions. keeping your extremities piping hot by wearing gloves/ using heat pads now while temps are still not totally frigid will not allow your body to naturally regulate it's temps to your extremities. And building up the tolerance / circulation needed to keep you warm will take much longer. Push yourself a bit but be careful not to go too far, frostbite is a very bad thing and has potential disastrous out comes.
Take a serious look at your circulation, your hands and feet will thank you
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