I live in Phx, so cold here is kind of a joke, but going north to the Grand Canyon, and there are times i have been out there in -20. Go east to the eastern side of the state it's teens and occasionally -10.
I usually stay out over night and sleep without a tent, just on a cot and a sleeping bag next to the truck. (even in the -20) I actually prefer the -0 or colder, just something about it.
Keep in mind we have 20 to 30 degree swings from cold to high in a day.
For this i use a little different technique than most.
LOTS of LAYERS.. like 5 or 6.
I have camo that is tee shirt material that is bigger than i need (m2D), and pants that are a little over sized.
I bring base layers silk, and wear that once lows are below 20. Otherwise i don't since in a hour or so after sunrise it's going to be 40 and then 50.
I have two sets of boots. Uninsultated for anything above 20. I have 600s for anything below that. (rahter have over insultation to be prepared for -20)
I wear the base layers and then on top will wear a turtle neck, and two fleece jackets (one is a pull over under an actual thick fleece jacket) then put the camo tee shirt over the top. I have found that i have 3 sets of gloves too. non insulation, lined, and then wool gloves(one is 5 finger for left hand to run remote (USMC has a wool military ones that have rubber dots to allow touch and grip on remotes), the other is a 3 finger shooter wool mitten for the right hand)
As the day warms i strip off the layers.. between stands.. fast and easy to stay comfortable. I like to be just getting cold at the end of a 20 minute stand, so i don't get to hot walking in or out of a stand. Wear a camo fleece skull cap on stand and take it off walking in and out.
I also found that a neck fleece is really nice, cheap and keeps you from needing other layers when you would normally put them on.
Since i don't deal with negative temps that often, i have sets of Field jacket liners (top and bottom) Those things.. WOW.. THey are super light, dry really fast, and feels like you are walking around in a sleeping bag comfortable.(if i was to sit in a deer stand, these would be the ticket) They are usually $10 on a lot of sites. I like the pants with buttons down the sides so if you take them off during the day you can do so without taking your pants and boots off.
For the Snow.. again since it's not that common, i couldn't justify spending the money, so i went to the fabric store, bought the pattern for Scrubs XXL(couple of bucks) and some 800 Denier white fabric for $6 per yard and 4 yards made pants and jacket.(denier is water resistant and sitting in snow never had a leak) I got some elastic for the sides of the jacket to allow for layers (and future gut growth) I added a sweatshirt through pocket at the waste line for putting gloves and things in, as well as an oversize left breast pocket to put the remote in. ( added a hood too, but hardly ever use it unless it's snowing or windy)
I then sprayed a little tan camo paint across the top to add some lines and faint shadow lines to dirty up the white.
I also camo painted the shooting sticks wood camo on one side and Snow on the other.
jacket liner
https://ads.midwayusa.com/product/607405...ASABEgLBofD_BwE
for the pants
https://ads.midwayusa.com/product/446754...ASABEgI9ivD_BwE
for the gloves i was talking about $3-10
https://www.midwayusa.com/product/1918118007/military-surplus-usmc-glove-insert-olive-drab
3 finger gloves for under $20 that come with outer shells that are leather palmed. I just sprayed them with some white paint to make them lighter.
https://www.midwayusa.com/product/191818...ell-with-liners