A layered system
This is my neck of the woods (Maine).
Are you stand hunting? or will you be moving? Dress in layers. Poly-pro, gortex and wool should be a part of the system. What about the possibility of an unscheduled night in the woods? Three or four pounds of down in the form of a sleeping bag can be a life saver.
As a general rule I want to be on the cool side (not cold) of comfortable when I am moving and then have warm outer layers to bulk up when I sit. A couple of squares of closed cell foam can help insulate your feet and butt from conduction heat loss when you are setting. Mittens are superior to gloves in extreme cold. Keep hydrated.
There are five ways you loss body heat:
Conduction: Touching something colder than you such as the ground
Convection: The wind
Radiation: Your uncovered surface areas
Respiration: from your breath
and evaporation: Sweat
Think about and manage these areas and winter hunting can be a blast.
Oh, what about back country skis or snow shoes?
There is no bad weather, but you must dress properly.
By the way, What are you hunting?