I have endured more than 70 Canadian winters. I'm pretty good at it, -40C and warmer.
Really, really cold? Wear mittens with a leash cord up your sleeves to join them. Inuit style.
The more fancy beadwork the better.
Then when you have to take one off for dexterity, you never drop it in the snow.
My canvas-lined moose-hide mukluks are a dream to wear in cold and 24" or more snow.
Warmer like you? Lined gloves are nice. I have several pairs so some can dry while I wear others.
Several sprays with a silicone repellant is disappointing.
Anything waxy will soak in and discolor the leather, if that matters at all to you. Not to me.
Rain and melting wet snow will leach just about everything out of leather.
Hold them open, get them dried, THEN slop on the proofing into the dried leather.
All pairs of my unlined leather deerskin gloves are dirty on the fingers and palms. So be it.
Actually, this coming week will be wet snow, cold rain and probably -5C nights.
Time to dig out the flannel-lined blue jeans, too.