First of all im no expert. So this is just an input! I almost feel bad for posting this becose its _so_ limited. There are so much more to this. But atleat its something.
I do have some experiens, first I live in Sweden just had -32 C last week. Thats insane even here (didnt go out for 3 days)
I was in the Army and have went thru the "winter soldier" Education . Now days I do alot of winter sports and enjoy being out in the winter skiing and stuff like that.
I cant go over everything here, just takes to much time, but I will start writing and we will see how long I go.
Some points im going to bring up have been writen about earlier in the thread. I will have all my temps in C, just convert
Body temp.
The ideal temp for humans in resting is 27C outside. The skin temp then is 33-34 C The body will always try to be 37C (inside)
When the temp drops the body will keep trying to get to this point. If it cant it will move
the blood from the outerparts from the body and keep the organs warm. This is when you get
pale and you will be cold. The heat you lose at -10C half of it comes thru your head. At -20
you lose 75% thru your head. Get a good hat! If the skin temp drops to 15C you will have big
truble using your hands.
You can combat this thru clouth and moving around. And you need energi and water at least 0,5-1L /24h if you dont sweat/resting (minimum). more like 4L /24h if you do work.
If you can always drink warm fluid. DONT eat snow.
You biggest enemy is getting wet. And if you are out for say 1 week this is a huge problem. You cant allow yourself to sweat. You need to be real active
with your layers. DONT get wet.
The next big thing is wind. Im not going to explain how it works but in short. Wind is bad, at 5m/s (meter/second) -5C is like -15C. The risk of getting frostbite
is getting high at around -30 no wind. And say that it blows 8m/s it will be dangerous as early as -10C.
If you get frostbite (small white spots) In the face, Get out of the wind and get you buddy to warm it with his hand. Dont rub! On your hand, put it in your buddys armpit.
Drink something warm. Eat something. If its not gone in 30 min its a "deep" frostbite, you need a doctor in 2-3h time.
Gear.
Layers, work in layers. Its super important to be able to regulate sweat/heat. Im not going to go in alot to this, there are ton of info in base layers etc
Have extra layers to change if something gets wet. (applyes to all layers) Dont forget to have diffrent hats aswell.
There are some tips that are the big ones.
_Dont_ get wet. If you going to do some kind of work take clouth off, be real active in layering.
Dont shave befor you go out, you remove the fat that protects you against frostbite. Wait atleast 4-5h after shaving.
My winter gear list. For skiing. (just clothes)
-On me
first layer is a 200 wool upper and lowerbody
Thin hat (wool 200)
buff
I always have 2 socks one liner 200 wool and one thicker
Hestra Seth Morrison Pro Model Glove
I have 2 diffrent mid layers one thinner fleece and one thinker wool. Dependet on weather I use both or one of them.
the other one go in the pack.
I have a second leg layer 400 wool. Same thing depending on weather I use on of them or both. Other one in pack.
I use a hard shell jacket and pants. I like hard shells becos I can vary my layers below alot and keep the protection from the shell.
-In my pack
extra first layer 200 wool
The mid layers I dont use.
Patagonia Nano Puff Mens Jacket
Extra sock sets
extra glovs, Hestra Heli 3-Finger Mittens with extra wool inserts.
wool balaclava
Gaters
And if I know its going to be real cold outside I pack a Down jacket big style that go over the shell jacket.
and same for the pants but they go under the shell pants (shell pants are baggy)
This is me skiing, Im not going in to the avalanche gear or repair kits I have with me etc and its not a survival setup even tho I would pack a knife and a way of getting fire going. Just take it for what it is
I hope it will give you an idea atleast.
Edit* Adding some temp info*
Active
From 0C to -*10C I use my lightest midlayers.
From -10C to -20C I use my thicker wool midlayer and also beef up my leg layer to my 400 wool. I also switch to my beefer glovs
Standing still I beef up with my Patagonia Nano Puff jacket under the shell and a thicker hat.
If its alot colder then -20 I would not go out if I have a choice. But if I was the story is still the same, but I would have my Down jacket to put over my shell when standing still. And maby use the
Patagonia Nano Puff jacket as another layer under the shell.